You searched for subject:(Trace elements).
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University of Hawaii – Manoa
1.
Dumas, Didier Pierre Heiarii.
Spatial distribution and origin of major, minor and trace elements in the ordnance reef area on the Wai'anae coast of O'ahu.
Degree: 2016, University of Hawaii – Manoa
URL: http://hdl.handle.net/10125/101700 
► M.S. University of Hawaii at Manoa 2011.
Ordnance Reef (HI-06) served as a disposal site for discarded military munitions (DMM) after World War II. Since…
(more)
▼ M.S. University of Hawaii at Manoa 2011.
Ordnance Reef (HI-06) served as a disposal site for discarded military munitions (DMM) after World War II. Since then, a number of incidents of munitions retrieval and washing ashore raised safety concerns about the presence and integrity of munitions and their impact on human and ecological health. Identification, research and monitoring of sea munitions disposal areas were authorized by H.R. 5122, and those specifically in Hawaiʻi by H.R. 4778 and S. 2295. The current study was undertaken as part of a remedial investigation requested by State and Federal agencies to address concerns remaining after several prior assessments of DMM in this area and to fill gaps in existing knowledge regarding potential threats posed by the DMM.
The study demonstrates that there is no widespread contamination in the Ordnance Reef (HI-06) area. The predominantly marine carbonate sediments found in the Ordnance Reef (HI-06) area generally display typical concentrations of contaminants of potential concern (COPC), although it is clear that the DMM do release certain trace elements into the environment at Ordnance Reef (HI-06) and contribute to increased sedimentary concentrations of these constituents. Other sources of contaminants to the study area were identified and include inputs from the wastewater treatment plan outfall and non-point source (NPS) pollution delivered from runoff through storm water along the coast of the study area. The analysis of sediments and biological samples (octopus, fish, crab and seaweed) recovered from the same locations shows that the enrichments in trace elements observed in sediments at selected sites do not translate into an increase of the concentration of those elements in the biological samples.
Subjects/Keywords: trace elements
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APA (6th Edition):
Dumas, D. P. H. (2016). Spatial distribution and origin of major, minor and trace elements in the ordnance reef area on the Wai'anae coast of O'ahu. (Thesis). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/101700
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Dumas, Didier Pierre Heiarii. “Spatial distribution and origin of major, minor and trace elements in the ordnance reef area on the Wai'anae coast of O'ahu.” 2016. Thesis, University of Hawaii – Manoa. Accessed January 29, 2020.
http://hdl.handle.net/10125/101700.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dumas, Didier Pierre Heiarii. “Spatial distribution and origin of major, minor and trace elements in the ordnance reef area on the Wai'anae coast of O'ahu.” 2016. Web. 29 Jan 2020.
Vancouver:
Dumas DPH. Spatial distribution and origin of major, minor and trace elements in the ordnance reef area on the Wai'anae coast of O'ahu. [Internet] [Thesis]. University of Hawaii – Manoa; 2016. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/10125/101700.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dumas DPH. Spatial distribution and origin of major, minor and trace elements in the ordnance reef area on the Wai'anae coast of O'ahu. [Thesis]. University of Hawaii – Manoa; 2016. Available from: http://hdl.handle.net/10125/101700
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
2.
Maulana, Ivan.
Basin Geochemical Evolution of the Eagle Ford and Effects on Trace Element Release.
Degree: MS, Geology, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/156808
► The Ocean Anoxic Event 2 (OAE-2) at the Cenomanian-Turonian boundary is recognized from a carbon isotope excursion (CIE) in the Eagle Ford (EF) Group, and…
(more)
▼ The Ocean Anoxic Event 2 (OAE-2) at the Cenomanian-Turonian boundary is recognized from a carbon isotope excursion (CIE) in the Eagle Ford (EF) Group, and commonly attributed to global anoxic conditions in deeper marine settings. Whereas OAE are typically marked by widespread deposition of organic-rich shales, previous work shows diachroneity between the CIE and the organic-rich Lower EF, as well as anoxia-euxinia in the Western Interior Seaway of North America. We found evidence for periodic photic zone euxinia from an EF core, based on ratios of biomarkers and redox-sensitive
trace elements. Sedimentary structures suggest depositional environments above storm wave base. Integration with a sequence-stratigraphic framework emphasizes the role of estuarine-style salinity stratification,
subject to redox shifts caused by storm mixing in relatively shallow water depths. Independent zircon ages indicate that transition from the Lower to Upper EF occurs in the south before the north, consistent with a northward migration of this stratification mechanism as sea level rose. This implies that the redox states during deposition of the EF leading up to the CIE were influenced by regionally distinct mechanisms at relatively shallow water depths, instead of global anoxic conditions in deeper marine settings.
Euxinic shales are rich in
trace elements, so there are high treatment costs to remove
trace elements that have been released to matrix acidizing fluids during production, before these fluids can be disposed or reused. By understanding mechanisms controlling the interaction between euxinic shales and acidizing fluids, it may be possible to improve the efficiency of unconventional production while simultaneously reducing environmental exposure.
Trace element residency in and release from the EF were determined at different depths and under different temperatures and acid conditions. We found evidence that
trace element release is mainly controlled by bulk
trace element concentrations. This suggests that for the average rock, increased
trace element release was associated with higher temperatures and acid concentrations, and these same conditions also resulted in higher sensitivity to
trace element concentrations.
Advisors/Committee Members: Tice, Michael (advisor), Herbert, Bruce (advisor), Wade, Terry (committee member), Marcantonio, Franco (committee member).
Subjects/Keywords: Euxinia; Trace Elements
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APA (6th Edition):
Maulana, I. (2016). Basin Geochemical Evolution of the Eagle Ford and Effects on Trace Element Release. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156808
Chicago Manual of Style (16th Edition):
Maulana, Ivan. “Basin Geochemical Evolution of the Eagle Ford and Effects on Trace Element Release.” 2016. Masters Thesis, Texas A&M University. Accessed January 29, 2020.
http://hdl.handle.net/1969.1/156808.
MLA Handbook (7th Edition):
Maulana, Ivan. “Basin Geochemical Evolution of the Eagle Ford and Effects on Trace Element Release.” 2016. Web. 29 Jan 2020.
Vancouver:
Maulana I. Basin Geochemical Evolution of the Eagle Ford and Effects on Trace Element Release. [Internet] [Masters thesis]. Texas A&M University; 2016. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/1969.1/156808.
Council of Science Editors:
Maulana I. Basin Geochemical Evolution of the Eagle Ford and Effects on Trace Element Release. [Masters Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/156808
Oregon State University
3.
Oakley, Stewart M.
The geochemical partitioning and bioavailability of trace metals in marine sediments.
Degree: PhD, Civil Engineering, 1980, Oregon State University
URL: http://hdl.handle.net/1957/42090
► Trace metals in the aquatic environment are generally concentrated on the surface of solid geochemical phases which eventually become incorporated into estuarine and marine sediments.…
(more)
▼ Trace metals in the aquatic environment are generally concentrated
on the surface of solid geochemical phases which eventually become incorporated
into estuarine and marine sediments. The mechanism of
trace
metal concentration is believed to be adsorption with various geochemical
phases such as hydrous metal oxides, clays, and organic matter.
Metals in estuarine or marine sediments can thus be expected to be partitioned
between different phases, depending on the concentration of the
phase and the strength of the adsorption bond.
The bioavailability of sediment-bound metals to deposit-feeding
organisms will depend on
trace metal partitioning and the kinetics of
biological metal uptake from each geochemical phase. The present study
was undertaken to develop models for
trace metal partitioning and bioavailability
in marine sediments.
An equilibrium adsorption model was developed that can be used to
predict the partitioning of
trace metals between different geochemical
phases in aquatic sediments from laboratory studies. The model uses
conditional equilibrium constants determined from the linear portion
of an adsorption isotherm. Conditional equilibrium constants deterit
mined for the adsorption of Cu and Cd on bentonite clay, Fe(OH)₃,
Mn0₂, and humic acid in seawater show that the model is applicable for
trace metal concentrations existing in the natural environment. Based
on the laboratory results, the model predicts that the clay fraction
may be a major sink for Cu and Cd in marine sediments.
A kinetic bioavailability model was then developed which can be
used to estimate the relative bioavailability of
trace metals from both
different sediment phases and seawater under short-term laboratory conditions.
This model was used to determine the bioavailability of Cu and
Cd from several sediment phases (bentonite clay, humic acid, Fe(OH)₃)
and seawater to the deposit-feeding polychaete worm, Abarenicola
pacifica. The results suggest that, under natural conditions similar
to those used in this study, the bioavailability of sediment-bound Cu
and Cd to A. pacifica can be much more significant than that of seawater.
Advisors/Committee Members: Williamson, Keneth J. (advisor), Tinsley, Ian (committee member).
Subjects/Keywords: Trace elements
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APA (6th Edition):
Oakley, S. M. (1980). The geochemical partitioning and bioavailability of trace metals in marine sediments. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/42090
Chicago Manual of Style (16th Edition):
Oakley, Stewart M. “The geochemical partitioning and bioavailability of trace metals in marine sediments.” 1980. Doctoral Dissertation, Oregon State University. Accessed January 29, 2020.
http://hdl.handle.net/1957/42090.
MLA Handbook (7th Edition):
Oakley, Stewart M. “The geochemical partitioning and bioavailability of trace metals in marine sediments.” 1980. Web. 29 Jan 2020.
Vancouver:
Oakley SM. The geochemical partitioning and bioavailability of trace metals in marine sediments. [Internet] [Doctoral dissertation]. Oregon State University; 1980. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/1957/42090.
Council of Science Editors:
Oakley SM. The geochemical partitioning and bioavailability of trace metals in marine sediments. [Doctoral Dissertation]. Oregon State University; 1980. Available from: http://hdl.handle.net/1957/42090
Oregon State University
4.
Ungerer, Carl Andre.
Atmospheric trace element abundances associated with slash burning.
Degree: MS, Chemistry, 1981, Oregon State University
URL: http://hdl.handle.net/1957/42244
► The atmospheric trace element abundances associated with slash burning have been measured by instrumental neutron activation analysis (INAA). On site ground level samples were collected…
(more)
▼ The atmospheric
trace element abundances associated with slash
burning have been measured by instrumental neutron activation analysis
(INAA). On site ground level samples were collected during the slash
burning season using high volume samplers and a cascade impactor. In
addition to the air samples, soil, wood and ashed wood samples were
collected for analysis. The abundances of up to 29
elements were
determined in each of the samples. The results show the air particulate
to be a mixture of upswept soil and wood ash. From the particle size
analysis and the calculated enrichment factors, wood ash was shown to be
the major source of the
elements Br, Cl, Hg, Sb, Se, Zn, K and As. Of
greatest interest is the high concentration of K associated with small
particles. Laboratory ashing of wood samples at 500°C and 1100°C
showed the
elements Zn, Na, K, Se, Hg, Br, and Cl to be depleted from
70-95% at 1100°C relative to unburned wood.
Advisors/Committee Members: Loveland, W. D. (advisor), Thomas, T. D. (committee member).
Subjects/Keywords: Trace elements
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APA (6th Edition):
Ungerer, C. A. (1981). Atmospheric trace element abundances associated with slash burning. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/42244
Chicago Manual of Style (16th Edition):
Ungerer, Carl Andre. “Atmospheric trace element abundances associated with slash burning.” 1981. Masters Thesis, Oregon State University. Accessed January 29, 2020.
http://hdl.handle.net/1957/42244.
MLA Handbook (7th Edition):
Ungerer, Carl Andre. “Atmospheric trace element abundances associated with slash burning.” 1981. Web. 29 Jan 2020.
Vancouver:
Ungerer CA. Atmospheric trace element abundances associated with slash burning. [Internet] [Masters thesis]. Oregon State University; 1981. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/1957/42244.
Council of Science Editors:
Ungerer CA. Atmospheric trace element abundances associated with slash burning. [Masters Thesis]. Oregon State University; 1981. Available from: http://hdl.handle.net/1957/42244
Oregon State University
5.
Rivera, Maria Rita Dacanay.
Variations in trace element abundances in small fragments from a single terrestrial basaltic flow : applications to 59 Apollo-17 mare basaltic fragments.
Degree: MS, Chemistry, 1979, Oregon State University
URL: http://hdl.handle.net/1957/42600
► Eleven hand specimen whole rock (WR) samples (25-200 g each) and 33 fragments (0.5-0.8 g each) from a single basaltic flow at Picture Gorge, Oregon…
(more)
▼ Eleven hand specimen whole rock (WR) samples (25-200 g each) and
33 fragments (0.5-0.8 g each) from a single basaltic flow at Picture
Gorge, Oregon were analyzed via instrumental neutron activation
analysis (INAA) for 12
elements (Na, Fe, Cr, Sc, Co, La, Sm, Eu, Yb,
Lu, Hf and Ta). Standard deviation, range, and similarity coefficient
were used to determine dispersions in element abundances of the
samples. The results show only slight variations in composition among
the samples suggesting that the flow is homogeneous with respect to the
above element abundances. Effect of sampling is evident by the
slightly less variability in composition of the powdered whole rock
samples as compared to the chipped fragments.
Petrographic studies of the whole rock samples also reveal their
similarity to one another. All samples consist mainly of plagioclase
(60%) and clinopyroxene (40%) with relatively small amounts of opaque
oxides and glass. Phenocrysts and microphenocrysts make up about 1-4%
of the rock samples. Although the groundmass grain size of the samples
coarsen away from the cooling surface, they are nevertheless rather
fine-grained (2 microns to 0.6 millimeter).
The grain size and compositional data indicate that dispersions
in
trace element concentrations of fragments from a single flow are
less pronounced for fine-grained basalts.
On the basis of the above results, calibration of similarity
coefficient using 12
elements implies that fine-grained 0.5-0.8 g
samples from the same flow should give about 98% of the coefficients
in the range 90-99% with about 75% of the coefficients in the 95-99%
range. Application of this criterion to 59 fine-grained Apollo-17
mare basalts reinforces the suggestion that these basalts originated
from three separate magma types (A, B and C) or flows, although the
rare Type C basalts are not well defined in this paper.
Advisors/Committee Members: Schmitt, Roman A. (advisor), Freund, Harry (committee member).
Subjects/Keywords: Trace elements
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APA (6th Edition):
Rivera, M. R. D. (1979). Variations in trace element abundances in small fragments from a single terrestrial basaltic flow : applications to 59 Apollo-17 mare basaltic fragments. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/42600
Chicago Manual of Style (16th Edition):
Rivera, Maria Rita Dacanay. “Variations in trace element abundances in small fragments from a single terrestrial basaltic flow : applications to 59 Apollo-17 mare basaltic fragments.” 1979. Masters Thesis, Oregon State University. Accessed January 29, 2020.
http://hdl.handle.net/1957/42600.
MLA Handbook (7th Edition):
Rivera, Maria Rita Dacanay. “Variations in trace element abundances in small fragments from a single terrestrial basaltic flow : applications to 59 Apollo-17 mare basaltic fragments.” 1979. Web. 29 Jan 2020.
Vancouver:
Rivera MRD. Variations in trace element abundances in small fragments from a single terrestrial basaltic flow : applications to 59 Apollo-17 mare basaltic fragments. [Internet] [Masters thesis]. Oregon State University; 1979. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/1957/42600.
Council of Science Editors:
Rivera MRD. Variations in trace element abundances in small fragments from a single terrestrial basaltic flow : applications to 59 Apollo-17 mare basaltic fragments. [Masters Thesis]. Oregon State University; 1979. Available from: http://hdl.handle.net/1957/42600
Oregon State University
6.
Cheung, Isabella Shiu Wing.
Indoor/outdoor atmospheric trace element abundances.
Degree: MS, Chemistry, 1978, Oregon State University
URL: http://hdl.handle.net/1957/43879
► The atmospheric trace element abundances associated with "indoor" and '"outdoor" air particulate have been measured for university chemistry laboratories, typical homes, modern office buildings, hospital…
(more)
▼ The atmospheric
trace element abundances associated with "indoor"
and '"outdoor" air particulate have been measured for university chemistry
laboratories, typical homes, modern office buildings, hospital and
automobile repair garages in a rural setting (Corvallis, Oregon) and
modern office buildings in an urban setting (Portland, Oregon). Samples
of atmospheric particulate matter were collected using a high volume
sampler, a cascade impactor and a specially designed, quiet sampler.
Analysis of the
trace elements Al , Fe, Ti , Na, K, Sm, Eu, La, Sc, Cl,
Mn, Br, V, Sb, Co, Cr, As, and Zn was done using instrumental neutron
activation analysis. I found that " upswept soil " and the " wood
products industry contribution" are the main components of Corvallis
Oregon rural air.The rural results show the mean indoor concentrations
to be -v75% of the outdoor concentrations with preferential loss of
larger particles as one moves from outdoors to indoors. The urban
results show typical indoor-outdoor ratios of ,N,18%. By examining any
enhancement or chemical fractionation in elemental abundance patterns
between indoor and outdoor particulate matter, one can identify
indoor sources. Sources of this type identified in this work include
acid vapors in the chemistry laboratory, auto exhaust in the automobile
repair garage and unidentified source(s) of atmospheric chromium in
the typical homes, potassium in one modern office, antimony and zinc
in the other modern office.
Advisors/Committee Members: Loveland, Walter D. (advisor).
Subjects/Keywords: Trace elements
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APA (6th Edition):
Cheung, I. S. W. (1978). Indoor/outdoor atmospheric trace element abundances. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/43879
Chicago Manual of Style (16th Edition):
Cheung, Isabella Shiu Wing. “Indoor/outdoor atmospheric trace element abundances.” 1978. Masters Thesis, Oregon State University. Accessed January 29, 2020.
http://hdl.handle.net/1957/43879.
MLA Handbook (7th Edition):
Cheung, Isabella Shiu Wing. “Indoor/outdoor atmospheric trace element abundances.” 1978. Web. 29 Jan 2020.
Vancouver:
Cheung ISW. Indoor/outdoor atmospheric trace element abundances. [Internet] [Masters thesis]. Oregon State University; 1978. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/1957/43879.
Council of Science Editors:
Cheung ISW. Indoor/outdoor atmospheric trace element abundances. [Masters Thesis]. Oregon State University; 1978. Available from: http://hdl.handle.net/1957/43879
Oregon State University
7.
Stanford, Harold Milford.
The concentration and oxidation state of chromium in sea water.
Degree: MS, Oceanography, 1970, Oregon State University
URL: http://hdl.handle.net/1957/29383
Subjects/Keywords: Trace elements
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APA (6th Edition):
Stanford, H. M. (1970). The concentration and oxidation state of chromium in sea water. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/29383
Chicago Manual of Style (16th Edition):
Stanford, Harold Milford. “The concentration and oxidation state of chromium in sea water.” 1970. Masters Thesis, Oregon State University. Accessed January 29, 2020.
http://hdl.handle.net/1957/29383.
MLA Handbook (7th Edition):
Stanford, Harold Milford. “The concentration and oxidation state of chromium in sea water.” 1970. Web. 29 Jan 2020.
Vancouver:
Stanford HM. The concentration and oxidation state of chromium in sea water. [Internet] [Masters thesis]. Oregon State University; 1970. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/1957/29383.
Council of Science Editors:
Stanford HM. The concentration and oxidation state of chromium in sea water. [Masters Thesis]. Oregon State University; 1970. Available from: http://hdl.handle.net/1957/29383
University of Hawaii
8.
Hubbard, Norman Jay.
Some trace elements in Hawaiian lavas.
Degree: PhD, 2009, University of Hawaii
URL: http://hdl.handle.net/10125/11306
► Typescript.
Bibliography: leaves 118-123.
vii, 123 l graphs, tables
About 170 Hawaiian lavas have been newly analyzed for Rb, Sr, and Zr, about 150 for…
(more)
▼ Typescript.
Bibliography: leaves 118-123.
vii, 123 l graphs, tables
About 170 Hawaiian lavas have been newly analyzed for Rb, Sr, and Zr, about 150 for Ni, and about 100 for Co and V. Twenty Samoan samples also have been analyzed for Rb, Sr, Zr, and Ni. Eight HIG-USGS interlaboratory standards have been analyzed for the above elements, and new independent Rb and Sr analyses have been made for the international rock standards W-1 and G-1. The distribution of strontium in Hawaiian volcanoes is linked closely with that of phosphorus. Nickel and cobalt vary with magnesium, which is a function of the olivine content. The distribution of vanadium is more closely linked to that of titanium than to any other element. Zirconium varies with potassium in alkalic and post-erosional lavas but shows a weak covariance in Hawaiian tholeiites. Antarctic tholeiites, with higher potassium contents than Hawaiian tholeiites, show a K vs. Zr distribution that parallels that for Hawaiian alkalic lavas. All element pairs investigated show clear to suggested differences between individual Hawaiian volcanoes. These differences presently show no definite correlation with other features. The covariation of any element pair is almost always smooth and indifferent to the tholeiitic-alkalic distinction, indicating a common or closely interrelated origin for both suites. Lavas of the Honolulu and Koloa series, as well as similar lavas, are commonly distinct in their trace element distributions but also show features that link them with other lavas of the same volcano.
Subjects/Keywords: Lava – Analysis; Trace elements
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APA ·
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Manager
APA (6th Edition):
Hubbard, N. J. (2009). Some trace elements in Hawaiian lavas. (Doctoral Dissertation). University of Hawaii. Retrieved from http://hdl.handle.net/10125/11306
Chicago Manual of Style (16th Edition):
Hubbard, Norman Jay. “Some trace elements in Hawaiian lavas.” 2009. Doctoral Dissertation, University of Hawaii. Accessed January 29, 2020.
http://hdl.handle.net/10125/11306.
MLA Handbook (7th Edition):
Hubbard, Norman Jay. “Some trace elements in Hawaiian lavas.” 2009. Web. 29 Jan 2020.
Vancouver:
Hubbard NJ. Some trace elements in Hawaiian lavas. [Internet] [Doctoral dissertation]. University of Hawaii; 2009. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/10125/11306.
Council of Science Editors:
Hubbard NJ. Some trace elements in Hawaiian lavas. [Doctoral Dissertation]. University of Hawaii; 2009. Available from: http://hdl.handle.net/10125/11306
9.
Λέτσιου, Σοφία.
Χαρακτηρισμός και ποσοτικός προσδιορισμός μορφών σεληνίου σε ορό αίματος και συσχέτισή του με διατροφικούς παράγοντες.
Degree: 2011, Harokopio University; Χαροκόπειο Πανεπιστήμιο
URL: http://hdl.handle.net/10442/hedi/33357
► To σελήνιο (Se) αποτελεί απαραίτητο ιχνοστοιχείο για τη ζωή ασκώντας τις δράσεις του ως απαραίτητο δομικό στοιχείο των σεληνοπρωτεινών (υπεροξειδάσες της γλουταθειόνης, σεληνοπρωτείνη Ρ, αναγωγάση…
(more)
▼ To σελήνιο (Se) αποτελεί απαραίτητο ιχνοστοιχείο για τη ζωή ασκώντας τις δράσεις του ως απαραίτητο δομικό στοιχείο των σεληνοπρωτεινών (υπεροξειδάσες της γλουταθειόνης, σεληνοπρωτείνη Ρ, αναγωγάση της θειορεδοξίνης, αποϊωδιονάσες της ιωδοθυροξίνης κ.α.), οι οποίες με τη σειρά τους έχουν ενεργό ρόλο στους αντιοξειδωτικούς/αντιφλεγμονώδεις μηχανισμούς του οργανισμού, στη διατήρηση της οξειδοαναγωγικής κατάστασης των κυττάρων και στο μεταβολισμό των θυρεοειδικών ορμονών. Συνεπώς, η επαρκής πρόσληψη Se με τη διατροφή είναι ιδιαίτερα σημαντική για τη σωστή λειτουργία του οργανισμού. Ωστόσο, οι διατροφικοί παράγοντες που καθορίζουν τα επίπεδα Se στον ανθρώπινο οργανισμό δεν είναι πλήρως διευκρινισμένοι ενώ καμία μεγάλη επιδημιολογική μελέτη δεν έχει γίνει στον Ελληνικό πληθυσμό. Παράλληλα, αν και η αυξημένη πρόσληψη Se έχει συσχετιστεί θετικά με το κίνδυνο εμφάνισης συγκεκριμένων νοσημάτων (διαβήτης, υπέρταση), η σχέση του με παράγοντες κινδύνου για καρδιαγγειακά νοσήματα είναι πολύ λιγότερο μελετημένη και τα αποτελέσματα αντικρουόμενα. Αυτό εν μέρει οφείλεται στις πλειοτροπικές και πολλές φορές αντίθετες δράσεις των σεληνοπρωτεϊνών στους μηχανισμούς εμφάνισης καρδιαγγειακών νοσημάτων. Η συσχέτιση συνεπώς των επιπέδων ολικού Se με παράγοντες κινδύνου για καρδιαγγειακά νοσήματα δεν επαρκεί και είναι πλέον απαραίτητη η ανάπτυξη ισχυρών αναλυτικών μεθόδων, οι οποίες θα έχουν την ικανότητα να προσδιορίζουν ταυτόχρονα τις διάφορες σεληνομορφές στα βιολογικά δείγματα . Για τις ανάγκες της συγκεκριμένης διατριβής, χρησιμοποιήθηκε αναλυτική μέθοδος βασισμένη στη χρωματογραφία συγγένειας σε συνδυασμό με φασματομετρία μάζας επαγωγικά συζευγμένου πλάσματος (dAF-(LC)-ICP/MS). Στη συνέχεια της μελέτης, πραγματοποιήθηκε περαιτέρω διερεύνηση της συνύπαρξης μικρών οργανικών μορίων και της υπεροξειδάσης της γλουταθειόνης-3. Για το σκοπό αυτό έγινε σύζευξη χρωματογραφικής στήλης μοριακού αποκλεισμού στο σύστημα dAF-ICP-MS. Τα αποτελέσματα των αναλυτικών μεθόδων ανέδειξαν ότι το Se βρίσκεται με τη μορφή SelP( 54%), GPx-3 (26%), SelAlb (12%) και άγνωστης μορφή (8%) στον ορό αίματος. Από την εφαρμογή της μεθόδου σε ένα υποπληθυσμό της μελέτης «ΑΤΤΙΚΗ»(Ν=399) προέκυψε ότι ένα σημαντικό μέρος του Ελληνικού πληθυσμού, όπως αυτό τουλάχιστον εκφράζεται από τη μελέτη ΑΤΤΙΚΗ, έχει έλλειψη σεληνίου. Οι διατροφικοί παράγοντες που συσχετίζονται θετικά με τα επίπεδα Se είναι η κατανάλωση κόκκινου κρέατος και πουλερικών (κρεατοφαγική δίαιτα). Η ανάλυση των σχέσεων σεληνίου/πρωτεινών σεληνίου με παράγοντες καρδιαγγειακού κινδύνου έδειξε ότι υπάρχει σημαντική συσχέτιση του Se με τους περισσότερους κλασσικούς παράγοντες (ηλικία, παχυσαρκία, κάπνισμα, υπέρταση, γλυκαιμία, λιπιδαιμία, δείκτες οξειδωτικού στρες και φλεγμονής), η οποία διαμεσολαβείται από διαφορετικές πρωτεΐνες σεληνίου. Παράλληλα, διαφάνηκε ότι όχι μόνο το ολικό σελήνιο αλλά κυρίως η διαφορετική κατανομή μου στις πρωτεΐνες σεληνίου σχετίζονται με τους παράγοντες κινδύνου γεγονός που υποδεικνύει ότι η κατανομή αυτή αποτελεί καλύτερο δείκτη της κατάστασης Se ενός ανθρώπου και ίσως αποδίδει…
Subjects/Keywords: Σελήνιο; Ιχνοστοιχεία; Selenium; Trace elements
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APA (6th Edition):
Λέτσιου, . . (2011). Χαρακτηρισμός και ποσοτικός προσδιορισμός μορφών σεληνίου σε ορό αίματος και συσχέτισή του με διατροφικούς παράγοντες. (Thesis). Harokopio University; Χαροκόπειο Πανεπιστήμιο. Retrieved from http://hdl.handle.net/10442/hedi/33357
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Λέτσιου, Σοφία. “Χαρακτηρισμός και ποσοτικός προσδιορισμός μορφών σεληνίου σε ορό αίματος και συσχέτισή του με διατροφικούς παράγοντες.” 2011. Thesis, Harokopio University; Χαροκόπειο Πανεπιστήμιο. Accessed January 29, 2020.
http://hdl.handle.net/10442/hedi/33357.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Λέτσιου, Σοφία. “Χαρακτηρισμός και ποσοτικός προσδιορισμός μορφών σεληνίου σε ορό αίματος και συσχέτισή του με διατροφικούς παράγοντες.” 2011. Web. 29 Jan 2020.
Vancouver:
Λέτσιου . Χαρακτηρισμός και ποσοτικός προσδιορισμός μορφών σεληνίου σε ορό αίματος και συσχέτισή του με διατροφικούς παράγοντες. [Internet] [Thesis]. Harokopio University; Χαροκόπειο Πανεπιστήμιο; 2011. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/10442/hedi/33357.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Λέτσιου . Χαρακτηρισμός και ποσοτικός προσδιορισμός μορφών σεληνίου σε ορό αίματος και συσχέτισή του με διατροφικούς παράγοντες. [Thesis]. Harokopio University; Χαροκόπειο Πανεπιστήμιο; 2011. Available from: http://hdl.handle.net/10442/hedi/33357
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
10.
Luchner, Sarah Anne.
Major, minor and trace elements in direct coal liquefaction:
effect on conversion and partitioning behavior.
Degree: MS, Energy and Mineral Engineering, 2010, Penn State University
URL: https://etda.libraries.psu.edu/catalog/11104
► With current concerns of depleting oil sources and the environmental impacts of off-shore drilling, the interest in liquid transportation fuels derived from coal is increasing.…
(more)
▼ With current concerns of depleting oil sources and the
environmental impacts of off-shore drilling, the interest in liquid
transportation fuels derived from coal is increasing. The direct
coal liquefaction process raises the hydrogen content of the
hydrocarbon solid to that of a hydrocarbon liquid which can be
upgraded to resemble refined petroleum products such as gasoline,
diesel fuel, and jet fuel. A difference, however, is that coal
contains a wider range and a higher concentration of inorganic
material and in direct coal liquefaction processes these inorganic
constituents must be accounted for. The objective of this thesis is
to determine the partitioning of major, minor and trace inorganic
elements during direct coal liquefaction and their effect on
conversion. The inorganic constituent partitioning was studied
because of potential health effects and operational impacts on
equipment. These health effects include contamination to the
atmosphere and water by Hg, As, and Se constituents. Important
operational impacts include corrosion, fouling, and catalyst
poisoning by alkali and alkaline earth metals Ca, K, Mg, and Na.
High mineral matter concentrations in the coal liquefaction
residues also pose challenges in post-processing. Two coals, an
Illinois No. 6 seam high volatile bituminous coal and a Montana
Dietz seam subbituminous coal, were used in direct coal
liquefaction experiments while varying temperature
(450C and 375C), pressure (6.9MPa and
7.9MPa of hydrogen), coal preparation procedures (as-received and
float-sink cleaning) and catalyst addition (with and without an FeS
catalyst). The reaction conditions were varied to analyze any
correlations with inorganic elements. Major, minor, and trace
inorganic element concentrations were measured in the feed coals
and their tetrahydrofuran (THF) soluble (liquid) and
THF-non-soluble (residue) products. The partitioning of an element
was determined by measuring the total mass of the individual
inorganic element fed into the system and their mass measured in
the solid and liquid products. A total of 16 major, minor and trace
elements was studied: Al, Ca, Fe, K, Mg, Mn, Na, S, Ti, As, Hg, Mo,
Ni, Pb, Se, V, and Zn. Elemental concentrations were measured by
atomic adsorption spectrometry and inductively coupled plasma
atomic emission spectrometry. The highest direct coal liquefaction
conversions resulted from tests using the Illinois No. 6
as-received coal. This coal not only had the highest sulfur, iron,
and pyrite concentrations, but also contained the smallest particle
size distribution of pyrite as determined by computer-controlled
scanning electron microscopy. It was found that the majority of the
inorganic constituents concentrated in the residue. Commonly the
concentrations of inorganic elements were two to six times higher
in the residue compared to the feed coal and this could result in
operational and environmental concerns. The elements Mg, Na, S, Hg,
Mo, V, and Zn often measured more than 5% (averaging about 20%) of
their initial weight…
Subjects/Keywords: coal liquefaction; trace elements; inorganic
elements
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APA ·
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MLA ·
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CSE |
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APA (6th Edition):
Luchner, S. A. (2010). Major, minor and trace elements in direct coal liquefaction:
effect on conversion and partitioning behavior. (Masters Thesis). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/11104
Chicago Manual of Style (16th Edition):
Luchner, Sarah Anne. “Major, minor and trace elements in direct coal liquefaction:
effect on conversion and partitioning behavior.” 2010. Masters Thesis, Penn State University. Accessed January 29, 2020.
https://etda.libraries.psu.edu/catalog/11104.
MLA Handbook (7th Edition):
Luchner, Sarah Anne. “Major, minor and trace elements in direct coal liquefaction:
effect on conversion and partitioning behavior.” 2010. Web. 29 Jan 2020.
Vancouver:
Luchner SA. Major, minor and trace elements in direct coal liquefaction:
effect on conversion and partitioning behavior. [Internet] [Masters thesis]. Penn State University; 2010. [cited 2020 Jan 29].
Available from: https://etda.libraries.psu.edu/catalog/11104.
Council of Science Editors:
Luchner SA. Major, minor and trace elements in direct coal liquefaction:
effect on conversion and partitioning behavior. [Masters Thesis]. Penn State University; 2010. Available from: https://etda.libraries.psu.edu/catalog/11104
Oregon State University
11.
Flannery, Kelly M.
Particulate Trace Metal Fluxes in the Western Arabian Sea and Their Links to Marine Productivity.
Degree: MS, Ocean, Earth, and Atmospheric Sciences, 2015, Oregon State University
URL: http://hdl.handle.net/1957/57253
► Many trace elements (e.g., Zn, Cd, Mo) are essential phytoplankton micronutrients, making them crucial to the marine ecosystem and ultimately the carbon cycle. Because of…
(more)
▼ Many
trace elements (e.g., Zn, Cd, Mo) are essential phytoplankton micronutrients, making them crucial to the marine ecosystem and ultimately the carbon cycle. Because of this association
trace metals are also utilized in paleoceanographic studies (e.g., Mo, Cd). However, not much is known about what controls the cycling of these
trace metals in seawater. The primary goal of this study was to improve our understanding Ag, Mo and Cd cycling, focusing on the particulate phase, so that we can understand what influences their delivery to the seafloor.
The concentrations of
trace metals (i.e., Ag, Mo, and Cd) and minor
elements (i.e., Al, Ba, Mn, Zn) were measured in sediment trap samples collected at three sites in the western Arabian Sea; two high productivity nearshore sites (MS2 and MS3) and one oligotrophic gyre site (MS5). The concentrations of these metals were converted to fluxes and compared to four commonly utilized productivity proxies; particulate organic carbon (POC), total barium (Ba), opal, and carbonate (CaCO₃). Particulate Ag flux increases with increasing trap depth at both MS2 and MS3, but decreased with increasing trap depth at MS5. Ag flux also shows a strong positive correlation with particulate organic carbon (POC), as well as opal and Ba. These data suggest that at the high productivity sites, Ag is accumulates in settling, organic-rich particles. There is no evidence that the intense Oxygen Minimum Zone, which characterizes the Arabian Sea, is influencing Ag accumulation. Nor is Ag simply related to the opal flux, refuting the idea that Ag is delivered to the seafloor by diatom frustules. Instead, dissolved Ag concentrations and POC and/or total particle flux are probably the main controls on particulate Ag formation. Particulate Mo flux also positively correlates well with POC flux, suggesting it might be scavenged onto particulate organic matter. There is also evidence of Mo scavenging by Mn oxyhydroxides in the deep trap. Therefore particulate Mo flux to the seafloor seems to be controlled by both POC flux and Mn oxyhydroxide formation. Particulate Cd is organic, despite the fact that Cd and POC fluxes do not correlate particularly well due to the unusual behavior of POC.
In summary, all three of the
trace metals studied show evidence of a link to organic carbon flux. Particulate Cd and Mo, as well as Ag at MS5, are found within, or possibly absorbed on to, the organic matter. They are cycled with this organic matter and thus their fluxes decrease with water depth. Very little of these metals will make it to the seafloor in deep ocean. Particulate Ag at the high productivity stations (MS2 and MS3) behaves differently. It is scavenged by sinking organic-rich particles and fluxes increase with water depth. Therefore, large amounts of particulate Ag could reach the seafloor, at least in regions characterized by high productivity.
Advisors/Committee Members: McKay, Jennifer L. (advisor), Carlson, Anders (committee member).
Subjects/Keywords: Paleoproductivity; Trace elements in water – Arabian Sea
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APA ·
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APA (6th Edition):
Flannery, K. M. (2015). Particulate Trace Metal Fluxes in the Western Arabian Sea and Their Links to Marine Productivity. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/57253
Chicago Manual of Style (16th Edition):
Flannery, Kelly M. “Particulate Trace Metal Fluxes in the Western Arabian Sea and Their Links to Marine Productivity.” 2015. Masters Thesis, Oregon State University. Accessed January 29, 2020.
http://hdl.handle.net/1957/57253.
MLA Handbook (7th Edition):
Flannery, Kelly M. “Particulate Trace Metal Fluxes in the Western Arabian Sea and Their Links to Marine Productivity.” 2015. Web. 29 Jan 2020.
Vancouver:
Flannery KM. Particulate Trace Metal Fluxes in the Western Arabian Sea and Their Links to Marine Productivity. [Internet] [Masters thesis]. Oregon State University; 2015. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/1957/57253.
Council of Science Editors:
Flannery KM. Particulate Trace Metal Fluxes in the Western Arabian Sea and Their Links to Marine Productivity. [Masters Thesis]. Oregon State University; 2015. Available from: http://hdl.handle.net/1957/57253
University of Hawaii
12.
Armitage, Donald Bruce.
The determination and distribution of various trace elements in natural waters by x-ray fluorescence spectroscopy.
Degree: PhD, 2009, University of Hawaii
URL: http://hdl.handle.net/10125/11411
► Typescript.
Bibliography: leaves [76]-79.
vi, 79 l maps, graphs, tables
A method was developed for the analysis, consecutively, of six trace metals uranium, copper, nickel,…
(more)
▼ Typescript.
Bibliography: leaves [76]-79.
vi, 79 l maps, graphs, tables
A method was developed for the analysis, consecutively, of six trace metals uranium, copper, nickel, cobalt, iron, and manganese in a sample of fresh water and sea water through a combination of solvent extraction with an 8-hydroxy quinoline-chloroform mixture and X-ray fluorescence spectrometry. The primary concentration step which may be carried out on board ship requires only three reagents and minimal equipment, thus reducing the risk of contamination and chemical changes due to storage. In addition, the method is nondestructive and extracted samples evaporated on filter paper may be stored for future reference. A precision of 10% or better was obtained for the six elements with a sample volume of 500 ml. The analysis was applied to sea water and fresh water samples obtained from various sources. Coastal sea water trace element content was found to be lower than that from mid-ocean. What appears to be significant differences in the trace element levels were found in the water masses studied but little variation with latitude was detected. Several of the elements, notably uranium, displayed an increase in concentration with depth. Examination of fresh water samples indicated that biological activity is related to the extractable trace metal content in that increased activity was accompanied by higher content or trace metals. This view has as yet not been substantiated by biological studies. Other samples showed evidence of differences which may be associated with the water source and pollution.
Subjects/Keywords: Trace elements; Water – Analysis; X-ray spectroscopy
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APA ·
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MLA ·
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APA (6th Edition):
Armitage, D. B. (2009). The determination and distribution of various trace elements in natural waters by x-ray fluorescence spectroscopy. (Doctoral Dissertation). University of Hawaii. Retrieved from http://hdl.handle.net/10125/11411
Chicago Manual of Style (16th Edition):
Armitage, Donald Bruce. “The determination and distribution of various trace elements in natural waters by x-ray fluorescence spectroscopy.” 2009. Doctoral Dissertation, University of Hawaii. Accessed January 29, 2020.
http://hdl.handle.net/10125/11411.
MLA Handbook (7th Edition):
Armitage, Donald Bruce. “The determination and distribution of various trace elements in natural waters by x-ray fluorescence spectroscopy.” 2009. Web. 29 Jan 2020.
Vancouver:
Armitage DB. The determination and distribution of various trace elements in natural waters by x-ray fluorescence spectroscopy. [Internet] [Doctoral dissertation]. University of Hawaii; 2009. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/10125/11411.
Council of Science Editors:
Armitage DB. The determination and distribution of various trace elements in natural waters by x-ray fluorescence spectroscopy. [Doctoral Dissertation]. University of Hawaii; 2009. Available from: http://hdl.handle.net/10125/11411
University of Tasmania
13.
Beckett, JM.
Selenium, zinc and copper status in Tasmania : dietary, lifestyle and some genetic associations.
Degree: 2010, University of Tasmania
URL: https://eprints.utas.edu.au/19291/1/whole_BeckettJeffreyMaxwell2010_thesis.pdf
► Micronutrient deficiency is a public health problem thought to affect a third of the world's population. In Tasmania, selenium deficiency occurred in livestock, and it…
(more)
▼ Micronutrient deficiency is a public health problem thought to affect a third of the
world's population. In Tasmania, selenium deficiency occurred in livestock, and it has
been hypothesised that the human population may be at risk of inadequate intakes.
There are few Australian studies of trace element status, and previous studies in
Tasmania have been very limited and have provided conflicting results.
The primary aim of this thesis was:
• To assess the selenium status of people in northern Tasmania;
• To identify factors that may influence selenium status in these people;
• To determine groups in this population that may be at increased risk of low
selenium status.
A secondary aim was to conduct an opportunistic study to assess the copper and zinc
status in the same population, and determine some of the factors which may be
associated with copper and zinc status in this population.
The main study was a cross sectional population study of approximately 500 subjects
randomly selected from the electoral roll in the northern Tasmania; this was
preceeded by a preliminary study which used a convenience sample from this same
geographical region, and some technical work on the assessment of copper and zinc
status.
Indices of trace element status measured included dietary intake, serum levels and
functional markers of status, such as glutathione peroxidase activity for selenium
status. This was linked with data on lifestyle habits, anthropometric measurements, dietary analysis for other nutrients, and the measurement of total antioxidant status
and lipid profiles.
Results from the preliminary research (n = 198) suggested that marginal selenium
status may be reasonably widespread in this population, and that certain gender/age
groups may also consume inadequate zinc. Hereditary haemochromatosis was not
observed to have a major effect on trace element status.
The population study on 498 subjects from the electoral rolls of north, north west and
north eastern Tasmania, suggested a high prevalence of marginal selenium status.
Northern Tasmanians had mean selenium intakes of 77.4 and 65.1 ug/d for men and
women respectively; with 27% of all subjects consuming inadequate amounts of
selenium as indicated by NH&MRC guidelines on dietary intakes.
Mean serum selenium was 1.13 umol/L; and hence a large proportion of the
population (80%) was estimated to have serum selenium concentrations below
threshold levels associated with selenoprotein requirements. The majority of subjects
also had serum selenium concentrations below the level suggested to offer
chemopreventative benefits for some cancers. Associations with a common
selenoprotein SNP were not found.
In investigations of zinc status, men in particular appeared at risk of inadequacy. Zinc
intakes were 12.6 and 10.9 mg/d for men and women respectively. Fifty two percent
of men consumed inadequate zinc compared to only 9% of women. Mean serum zinc
concentration was 13.0 umol/L and when compared to the WHO cut-off, 15% of all
men had low serum…
Subjects/Keywords: Trace elements; Selenium in human nutrition
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APA ·
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APA (6th Edition):
Beckett, J. (2010). Selenium, zinc and copper status in Tasmania : dietary, lifestyle and some genetic associations. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/19291/1/whole_BeckettJeffreyMaxwell2010_thesis.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Beckett, JM. “Selenium, zinc and copper status in Tasmania : dietary, lifestyle and some genetic associations.” 2010. Thesis, University of Tasmania. Accessed January 29, 2020.
https://eprints.utas.edu.au/19291/1/whole_BeckettJeffreyMaxwell2010_thesis.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Beckett, JM. “Selenium, zinc and copper status in Tasmania : dietary, lifestyle and some genetic associations.” 2010. Web. 29 Jan 2020.
Vancouver:
Beckett J. Selenium, zinc and copper status in Tasmania : dietary, lifestyle and some genetic associations. [Internet] [Thesis]. University of Tasmania; 2010. [cited 2020 Jan 29].
Available from: https://eprints.utas.edu.au/19291/1/whole_BeckettJeffreyMaxwell2010_thesis.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Beckett J. Selenium, zinc and copper status in Tasmania : dietary, lifestyle and some genetic associations. [Thesis]. University of Tasmania; 2010. Available from: https://eprints.utas.edu.au/19291/1/whole_BeckettJeffreyMaxwell2010_thesis.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Rochester
14.
Darrah, Thomas Henry (1981 - ).
Inorganic trace element composition of modern human bones
: relation to bone pathology and geographical provenance.
Degree: PhD, 2011, University of Rochester
URL: http://hdl.handle.net/1802/14539
► Research presented in this thesis investigates the trace element, rare earth element, and lead isotope chemistry of cortical and trabecular bone tissues of modern humans.…
(more)
▼ Research presented in this thesis investigates the
trace element, rare earth element, and lead isotope chemistry of
cortical and trabecular bone tissues of modern humans. Samples are
of femoral heads discarded following full hip replacement surgeries
at the URMC.
Chapter 3: Quantification of the existing NIST
certified standard reference material for analysis of human bones
by inductively coupled plasma mass spectrometry (ICP-MS), for
previously unknown quantities of 33 trace elements.
Chapter 4: A
comparison of trace element concentrations in bone to natural
abundance. Relative incorporation of trace elements is shown to be
strongly affected by ionic radius and oxidation state. We identify
elements affected by metabolic regulation, and non-metabolically
regulated elements suitable for geographic provenance studies.
Chapter 5: Trace element compositions of a recent immigrant are
compared to those of Rochester residents to determine their
potential for geographical provenance studies. Biopurification
corrected elemental ratios distinguish the immigrant from Rochester
residents, reflecting mixing between NMORB, characteristic of
previous domicile, and the Rochester UCC-type soils.
Chapter 6:
Lead isotopic compositions of a recent immigrant are compared to
those of Rochester residents to determine the potential for
geographical provenance studies. Lead isotopic compositions of
Rochester residents cluster similar to Rochester soil and UCC. The
immigrant is strongly differentiated from Rochester residents
(>5δ from their mean) by lead isotopic compositions of both
cortical and trabecular tissues; long term exposure to a lead
source distinct from that of Rochester residents is evidenced.
Chapter 7: Bone is shown to incorporate anomalously high
concentrations of gadolinium (Gd) from the chelated form used in
contrast agents for medical imaging (i.e. MRI, MRA), revealing
rapid breakdown of medically dosed chelates to toxic free Gd3+ and
incorporation into bone tissues. Incorporation and/or retention of
Gd differs between osteoarthritis and fracture patients, indicating
a bone pathology effect on metal processing.
Chapter 8: Potential
for trace elements to affect bone health is investigated through
comparison of trace element compositions of patients with
osteoarthritis and osteoporosis-related fracture. Toxic metals,
total metals, and transition metals are all higher in fracture
patients, while Ba concentrations are lower.
Subjects/Keywords: Bone; Biominerals; Bone chemistry; Gadolinium; Trace elements
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APA (6th Edition):
Darrah, T. H. (. -. ). (2011). Inorganic trace element composition of modern human bones
: relation to bone pathology and geographical provenance. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/14539
Chicago Manual of Style (16th Edition):
Darrah, Thomas Henry (1981 - ). “Inorganic trace element composition of modern human bones
: relation to bone pathology and geographical provenance.” 2011. Doctoral Dissertation, University of Rochester. Accessed January 29, 2020.
http://hdl.handle.net/1802/14539.
MLA Handbook (7th Edition):
Darrah, Thomas Henry (1981 - ). “Inorganic trace element composition of modern human bones
: relation to bone pathology and geographical provenance.” 2011. Web. 29 Jan 2020.
Vancouver:
Darrah TH(-). Inorganic trace element composition of modern human bones
: relation to bone pathology and geographical provenance. [Internet] [Doctoral dissertation]. University of Rochester; 2011. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/1802/14539.
Council of Science Editors:
Darrah TH(-). Inorganic trace element composition of modern human bones
: relation to bone pathology and geographical provenance. [Doctoral Dissertation]. University of Rochester; 2011. Available from: http://hdl.handle.net/1802/14539
University of Nairobi
15.
Nguta, JM.
Determination of levels of trace elements in pastures in some regions in Kenya
.
Degree: 2007, University of Nairobi
URL: http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/13915
► Trace elements are needed by ruminant animals for physiological and biochemical processes. The trace elements at optimum levels make animals to maintain desired production performance…
(more)
▼ Trace elements are needed by ruminant animals for physiological and biochemical
processes. The trace elements at optimum levels make animals to maintain desired
production performance parameters. Excesses of some of these trace elements can also
lead to toxicosis. The important trace elements are copper, cobalt, zinc and selenium.
The present study was conducted to determine levels of copper, cobalt, zinc,
and selenium in known pasture grasses from eight regions of Kenya; to establish
whether the named trace elements are deficient or in toxic quantities; to relate
the trace element levels from the pasture grasses from different regions of Kenya
with known recommended values in mg/kg of dry matter (mg/kg of DM) for
optimum livestock production, and finally to recommend any intervention
measures.
Forage samples (n = 171) were collected from eight regions in Kenya during
months of July and August 2005. These regions were: Coast province, Machakos
district, Nairobi province, Kiambu district, Mount Kenya region, Nakuru district,
Eldoret region and Homabay district. The pasture grasses collected were: kikuyu grass,
napier grass, red oats grass, star grass, sweet pitted grass, common setaria, brown
hood grass and sudan grass. The samples were then transported to the laboratory.
The grass samples (20 grams) were chopped into one-centimetre pieces and oven
dried for 48 hours at 600C. They were then ground using Willey mill no. 20 stainless
steel sieve and allowed to equilibrate with the atmospheric pressure for 12 hours and
mixed properly pending assay for trace elements. Nine validation assay techniques
were conducted, correlation coefficients determined, and the technique that gave the
highest positive correlation, (R2) value of 0.997, with a regression equation of,
Y=0.046 + 0.021X, was adopted in the isolation and quantification of trace
ents from the sample matrix. A linear regression curve was fitted for the
technique. Constituent trace elements (Co, Cu, Zn, and Se) were separated from the
organic matrix using wet oxidation, with the digestion chemicals being nitric acid and
perchloric acid at the ratio of 3:1 respectively. The trace elements were assessed using
Perkin-Elmer model 2380 flame atomic absorption spectrophotometer at the following
wavelengths: 327.4 nm, 240.7 nm, 213.9 nm, and 196.0 nm for copper, cobalt, zinc,
and selenium respectively. Mean (mg/kg of DM) ± SD national values for zinc,
copper, selenium and cobalt were 44.1 ± 20.5, 4.2 ± 1.6, < 0 and 4.4 ± 6.3 respectively.
These values were found to be below the nutritional requirements for optimum
livestock production for copper, zinc and selenium and suggestive of a deficiency,
while fifty percent (50%) of all the regions investigated had cobalt levels that
were observed to be below the normal recommended values for optimum
livestock production, and were found to be deficient of the trace element.
Deficiency was shown in 68% of pastures for copper, 62% of pastures for zinc,
in 61% of pastures for cobalt and in 42% of…
Subjects/Keywords: Trace Elements;
Pastures
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APA (6th Edition):
Nguta, J. (2007). Determination of levels of trace elements in pastures in some regions in Kenya
. (Thesis). University of Nairobi. Retrieved from http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/13915
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nguta, JM. “Determination of levels of trace elements in pastures in some regions in Kenya
.” 2007. Thesis, University of Nairobi. Accessed January 29, 2020.
http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/13915.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nguta, JM. “Determination of levels of trace elements in pastures in some regions in Kenya
.” 2007. Web. 29 Jan 2020.
Vancouver:
Nguta J. Determination of levels of trace elements in pastures in some regions in Kenya
. [Internet] [Thesis]. University of Nairobi; 2007. [cited 2020 Jan 29].
Available from: http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/13915.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nguta J. Determination of levels of trace elements in pastures in some regions in Kenya
. [Thesis]. University of Nairobi; 2007. Available from: http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/13915
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Illinois – Urbana-Champaign
16.
Oh, Kyuhak.
Optimization of detector response simulations for multiple particles created by neutron-induced reactions.
Degree: PhD, Nuclear, Plasma, Radiolgc Engr, 2016, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/95462
► This research introduces the design of the optimized Pulsed Neutron Facility (PNF), which consists of a D-T neutron generator, a fueled graphite monolith, and a…
(more)
▼ This research introduces the design of the optimized Pulsed Neutron Facility (PNF), which consists of a D-T neutron generator, a fueled graphite monolith, and a detection system, and studies the optimization of detector response simulations for multiple particles created by neutron-induced reactions. Neutron Activation Analysis (NAA) method was used to investigate the influence of the
trace element, chlorine, in the biological system of the human body using the Monte Carlo simulation toolkits. Even though one of
trace elements, chlorine, has a strong signal of the characteristic γ-rays by neutron capture reactions, it never has been used for in vivo detection of the cancer, previously. In this research, the possibility to detect some cancers by using the chlorine was discovered by comparing the concentration of the chlorine between normal and cancerous tissues. Based on the MCNPX simulations, the initial research focused on optimizing the yield of thermal neutrons in the PNF system, which can then be used as a source for the interactions with the biological sample while minimizing the background radiations. Moderating layer materials and fuel configurations of the graphite monolith, and the shielding configurations of the detection system were considered for the optimization. Through the GATE simulations, the detector responses by multiple particle interactions with biological sample were studied for the optimized concentration sensitivity of the chlorine between the normal and cancerous tissues considering various detector types, and thicknesses as well as different shielding configurations of the detection system. γ-ray spectra were analyzed, energy depositions by individual particle were calculated, and the normalized count ratio was defined for determining the optimized sensitivity of the chlorine isotope between normal and cancerous tissues. Three detector materials were considered: HPGe, CdTe, and NaI. At the peak of 8.58 MeV, the NaI detector has a better sensitivity of the chlorine than the other two detectors. Even though the HPGe detector has the best resolution, it has the worst sensitivity. Using the Monte Carlo simulation toolkits, the optimized PNF and detection system were proposed as a novel concept for strengthening the sensitivity of the characteristic γ-rays by neutron-material interactions.
Advisors/Committee Members: Heuser, Brent J. (advisor), Heuser, Brent J. (Committee Chair), Uddin , Rizwan (committee member), Meng , Ling-Jian (committee member), Nie, Linda H. (committee member).
Subjects/Keywords: Nuclear detector; Optimization; Particle interaction; Trace elements
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APA (6th Edition):
Oh, K. (2016). Optimization of detector response simulations for multiple particles created by neutron-induced reactions. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/95462
Chicago Manual of Style (16th Edition):
Oh, Kyuhak. “Optimization of detector response simulations for multiple particles created by neutron-induced reactions.” 2016. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 29, 2020.
http://hdl.handle.net/2142/95462.
MLA Handbook (7th Edition):
Oh, Kyuhak. “Optimization of detector response simulations for multiple particles created by neutron-induced reactions.” 2016. Web. 29 Jan 2020.
Vancouver:
Oh K. Optimization of detector response simulations for multiple particles created by neutron-induced reactions. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2016. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/2142/95462.
Council of Science Editors:
Oh K. Optimization of detector response simulations for multiple particles created by neutron-induced reactions. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/95462
17.
Caughey, Robert A.
A study of the assimilation of some trace elements by plants.
Degree: Chemistry, 1937, University of Massachusetts
URL: https://scholarworks.umass.edu/theses/1384
Subjects/Keywords: Plant; Trace elements
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MLA ·
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APA (6th Edition):
Caughey, R. A. (1937). A study of the assimilation of some trace elements by plants. (Thesis). University of Massachusetts. Retrieved from https://scholarworks.umass.edu/theses/1384
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Caughey, Robert A. “A study of the assimilation of some trace elements by plants.” 1937. Thesis, University of Massachusetts. Accessed January 29, 2020.
https://scholarworks.umass.edu/theses/1384.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Caughey, Robert A. “A study of the assimilation of some trace elements by plants.” 1937. Web. 29 Jan 2020.
Vancouver:
Caughey RA. A study of the assimilation of some trace elements by plants. [Internet] [Thesis]. University of Massachusetts; 1937. [cited 2020 Jan 29].
Available from: https://scholarworks.umass.edu/theses/1384.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Caughey RA. A study of the assimilation of some trace elements by plants. [Thesis]. University of Massachusetts; 1937. Available from: https://scholarworks.umass.edu/theses/1384
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
18.
Kurmis, Rochelle.
The effectiveness of trace element supplementation following severe burn injury: a systematic review.
Degree: 2015, University of Adelaide
URL: http://hdl.handle.net/2440/99093
► Trace elements have an important physiological role following severe burn injury with patients routinely receiving supplementation. Although trace element supplementation is commonly prescribed after burn…
(more)
▼ Trace elements have an important physiological role following severe burn injury with patients routinely receiving supplementation. Although
trace element supplementation is commonly prescribed after burn injury, variations exist between supplement composition, frequency and the dosage administered. This objective of this research was to identify, assess and synthesise the available evidence on the effectiveness of
trace element supplementation on clinically meaningful outcomes, including mortality, length of stay, rate of wound healing and complications in patients who have sustained a severe burn injury. Following development of an a priori protocol, the effectiveness of selenium, copper and zinc supplementation, either alone or combined, compared to placebo or standard treatment, was investigated via systematic review and meta-analysis. A comprehensive search strategy was designed and employed to identify published and unpublished research. Methodological quality of eligible studies was critically appraised and relevant data extracted for synthesis. Eight studies were included in the review: four randomised controlled trials and four nonrandomised experimental trials, representing 398 participants with an age range of six to 67 years. Results of this research indicate that the use of parentally-administered combined
trace elements following burn injury confers positive effects in decreasing infectious complications. Combined parenteral
trace element supplementation and combined oral and parenteral zinc supplementation have potentially clinically significant implications on reducing length of stay. Oral zinc supplementation shows possible beneficial effects on mortality. Further studies are required to accurately define optimal
trace element supplementation regimens, dosages and routes, and to determine cost-effectiveness.
Advisors/Committee Members: Aromataris, Edoardo Claudio (advisor), Greenwood, John Edward (advisor), School of Translational Health Science (school).
Subjects/Keywords: burn injury; trace elements; nutrition support
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Manager
APA (6th Edition):
Kurmis, R. (2015). The effectiveness of trace element supplementation following severe burn injury: a systematic review. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/99093
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kurmis, Rochelle. “The effectiveness of trace element supplementation following severe burn injury: a systematic review.” 2015. Thesis, University of Adelaide. Accessed January 29, 2020.
http://hdl.handle.net/2440/99093.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kurmis, Rochelle. “The effectiveness of trace element supplementation following severe burn injury: a systematic review.” 2015. Web. 29 Jan 2020.
Vancouver:
Kurmis R. The effectiveness of trace element supplementation following severe burn injury: a systematic review. [Internet] [Thesis]. University of Adelaide; 2015. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/2440/99093.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kurmis R. The effectiveness of trace element supplementation following severe burn injury: a systematic review. [Thesis]. University of Adelaide; 2015. Available from: http://hdl.handle.net/2440/99093
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
19.
Lewis, David John.
Detrital Zircon Trace Element Characterization of Middle to Late Ordovician Quartz Arenites along the Transcontinental Arch.
Degree: 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/156400
► During the Middle to Late Ordovician, Laurentia was situated over the equator and the Transcontinental Arch, and its exposed basement rock and sedimentary cover straddled…
(more)
▼ During the Middle to Late Ordovician, Laurentia was situated over the equator and the Transcontinental Arch, and its exposed basement rock and sedimentary cover straddled the equator. This resulted in unique siliciclastic deposition of a diachronous group of quartz arenites during an otherwise long interval of almost entirely carbonate deposition. In recent years, a rapidly expanding database, especially in laser ablation ? inductively coupled plasma mass spectrometry (LA-ICPMS) geochronology, has led to significant advances in understanding the provenance of these quartz arenites on both sides of the Transcontinental Arch, the passive margin of western Laurentia and US Midcontinent. Detrital zircon from quartz arenite samples were previously dated using U-Pb methods to make interpretive correlations between detrital zircons and their source terranes. However, age data alone do not always uniquely discriminate between potential source regions. To aid in further discrimination, an LA-ICPMS analytical method was developed to obtain
trace-elemental composition data from detrital zircons that were previously analyzed for U-Pb ages. When coupled with U-Pb geochronologic data, this additional geochemical data can serve as an improved reference for discrimination between source terranes.
Trace element diagrams (e.g. REE plots) are used as discrimination diagrams to differentiate between potential source regions that are of similar age. Results of this study indicate that there are no significant resolvable differences in zircon
trace element compositions that can be correlated with differences in U-Pb age spectra from the quartz arenite samples.
Advisors/Committee Members: Miller, Brent V (advisor), Pope, Michael C (advisor), Lamb, William M (committee member), Houser, Chris (committee member).
Subjects/Keywords: zircon; trace elements; laser ablation; sediment provenance
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APA (6th Edition):
Lewis, D. J. (2015). Detrital Zircon Trace Element Characterization of Middle to Late Ordovician Quartz Arenites along the Transcontinental Arch. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156400
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lewis, David John. “Detrital Zircon Trace Element Characterization of Middle to Late Ordovician Quartz Arenites along the Transcontinental Arch.” 2015. Thesis, Texas A&M University. Accessed January 29, 2020.
http://hdl.handle.net/1969.1/156400.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lewis, David John. “Detrital Zircon Trace Element Characterization of Middle to Late Ordovician Quartz Arenites along the Transcontinental Arch.” 2015. Web. 29 Jan 2020.
Vancouver:
Lewis DJ. Detrital Zircon Trace Element Characterization of Middle to Late Ordovician Quartz Arenites along the Transcontinental Arch. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/1969.1/156400.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lewis DJ. Detrital Zircon Trace Element Characterization of Middle to Late Ordovician Quartz Arenites along the Transcontinental Arch. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/156400
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Latrobe University
20.
Love, Pettina.
Spatial and Temporal Characteristics of Arsenic in the Bogong Moth (Agrotis infusa).
Degree: PhD, 2010, Latrobe University
URL: http://hdl.handle.net/1959.9/513836
► Thesis (Ph.D.) - La Trobe University, 2010
Submission note: "A thesis submitted in total fulfilment of the requirements for the degree of Doctor of Philosophy…
(more)
Subjects/Keywords: Moths.; Arsenic.; Trace elements Environmental aspects.
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APA (6th Edition):
Love, P. (2010). Spatial and Temporal Characteristics of Arsenic in the Bogong Moth (Agrotis infusa). (Doctoral Dissertation). Latrobe University. Retrieved from http://hdl.handle.net/1959.9/513836
Chicago Manual of Style (16th Edition):
Love, Pettina. “Spatial and Temporal Characteristics of Arsenic in the Bogong Moth (Agrotis infusa).” 2010. Doctoral Dissertation, Latrobe University. Accessed January 29, 2020.
http://hdl.handle.net/1959.9/513836.
MLA Handbook (7th Edition):
Love, Pettina. “Spatial and Temporal Characteristics of Arsenic in the Bogong Moth (Agrotis infusa).” 2010. Web. 29 Jan 2020.
Vancouver:
Love P. Spatial and Temporal Characteristics of Arsenic in the Bogong Moth (Agrotis infusa). [Internet] [Doctoral dissertation]. Latrobe University; 2010. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/1959.9/513836.
Council of Science Editors:
Love P. Spatial and Temporal Characteristics of Arsenic in the Bogong Moth (Agrotis infusa). [Doctoral Dissertation]. Latrobe University; 2010. Available from: http://hdl.handle.net/1959.9/513836
University of Edinburgh
21.
de Grouchy, Charlotte J. L.
Trace element incorporation in silicate melts and glasses at high pressure.
Degree: PhD, 2017, University of Edinburgh
URL: http://hdl.handle.net/1842/22848
► Trace elements are highly fractionated during large-scale melting associated with planetary differentiation events. The resulting partition coefficients are used to constrain a range of geological…
(more)
▼ Trace elements are highly fractionated during large-scale melting associated with planetary differentiation events. The resulting partition coefficients are used to constrain a range of geological processes and are known to be influenced by pressure, temperature, and compositional changes in crystalline structures. Although recent studies have shown that melt compositional changes affect the partitioning of trace elements, the degree to which these ratios are influenced by alterations in the melt structure, especially with increasing pressure, is poorly constrained due to the difficulty of collecting structural information on bonding environments in situ. A basic understanding of how these elements are incorporated in silicate melts is critical to interpreting early planetary differentiation and crust forming events. This thesis presents results from both x-ray diffraction and absorption techniques on trace element (Y, Zr, Lu and Nd) incorporation in silicate melt structures. The structure of two rare Earth element doped model end member silicate liquids, a highly polymerised haplogranite (Si- Al-Na-K-O) and a less polymerised anorthite-diopside (Si-Al-Mg-Ca-O), have been studied. The results are the first to identify trace rare Earth element (REE) incorporation in silicate melts at high pressure using x-ray diffraction techniques. The local melt structure around Y and Zr in a highly polymerised haplogranite has been studied using x-ray absorption spectroscopy up to 8GPa and 1650 K. Both elements appear to adopt 8-fold coordination within the melt structure with no variation over the pressure range studied. This was also found for the Lu bonding environment in the same composition where the coordination number of Lu-O was found to be 8, with a bond distance rLu-O = 2:36A in the haplogranite melt. At low pressures, < 5GPa, the bonding environment of Lu-O was found to be dependent on composition with coordination decreasing to CNLu-O = 6 and rLu-O = 2:29A in the anorthite-diopside melt. This compositional variance in coordination number at low pressure is consistent with observations made for Y-O in glasses at ambient conditions and is coincident with a dramatic increase in the partition coefficients previously observed for rare Earth elements (REE) with increasing melt polymerisation. However, an abrupt change in both Lu-O coordination and bond distance is observed at 5GPa in the anorthite-diopside melt, with CNLu-O increasing from 6 to 8-fold and rLu-O from 2.29 to 2.39A. This occurs over a similar pressure range where a reduction in the reported heavy REE partition coefficients is observed. X-ray diffraction experiments up to 60GPa and 2000K have also been performed on the incorporation of the larger light REE, Nd, in basaltic-like melts. The results presented show that incorporation within the anorthite-diopside composition is dependent on the size of the REE. Nd-O initially shows the same 6-fold coordination as Lu-O at ambient conditions, although the change to 8-fold coordination appears to occur at considerably…
Subjects/Keywords: 551.9; silicate melts; high pressure; trace elements
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APA (6th Edition):
de Grouchy, C. J. L. (2017). Trace element incorporation in silicate melts and glasses at high pressure. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/22848
Chicago Manual of Style (16th Edition):
de Grouchy, Charlotte J L. “Trace element incorporation in silicate melts and glasses at high pressure.” 2017. Doctoral Dissertation, University of Edinburgh. Accessed January 29, 2020.
http://hdl.handle.net/1842/22848.
MLA Handbook (7th Edition):
de Grouchy, Charlotte J L. “Trace element incorporation in silicate melts and glasses at high pressure.” 2017. Web. 29 Jan 2020.
Vancouver:
de Grouchy CJL. Trace element incorporation in silicate melts and glasses at high pressure. [Internet] [Doctoral dissertation]. University of Edinburgh; 2017. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/1842/22848.
Council of Science Editors:
de Grouchy CJL. Trace element incorporation in silicate melts and glasses at high pressure. [Doctoral Dissertation]. University of Edinburgh; 2017. Available from: http://hdl.handle.net/1842/22848
University of Surrey
22.
Adair, Jill.
Trace element and selenium speciation analysis of human body fluids by ICP-MS.
Degree: PhD, 2002, University of Surrey
URL: http://epubs.surrey.ac.uk/843747/
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248076
► Analytical methods were developed and validated for the determination of the total concentration of trace elements (Se, Fe, Cu, Zn, Mg, Ca, Mn, Mo, I,…
(more)
▼ Analytical methods were developed and validated for the determination of the total concentration of trace elements (Se, Fe, Cu, Zn, Mg, Ca, Mn, Mo, I, Cd and Pb) and the various organic and inorganic selenium species present in human body fluids. Total elemental analysis involved the use of inductively coupled plasma mass spectrometry (ICP-MS). Speciation analysis utilised ion-pair high performance liquid chromatography (HPLC) coupled on-line to a hexapole collision cell ICP-MS. The methods that were developed were then applied to three separate studies. The effect of psychological stress on human fertility was determined by comparing the trace element levels in blood serum from 47 infertile women undergoing in-vitro fertilisation (IVF) treatment. Elemental data was compared with stress-hormone (plasma prolactin and serum cortisol) levels and Spielberger stress questionnaires. Statistical analysis showed no relationship between stress-hormones and blood serum trace element levels and that stress-hormones do not have an adverse effect on human fertility. A further study examined the total trace element levels of blood serum, follicular fluid, endometrial fluid and scalp hair from a study population of 97 women aged between 24 - 44 years undergoing IVF treatment. Selenium levels in blood serum were significantly lower in IVF patients in contrast to 18 (age and gender matched) control cases (P = 0.001, 35 degrees of freedom). This was in agreement with a previous study with infertile women, aged < 35 years. Zinc and manganese were determined in endometrial fluid, both showing a high degree of correlation (P = 0.001, 17 degrees of freedom) in the IVF population (no control samples were available for analysis). The levels of each element measured in scalp hair showed no correlation with the levels determined in any other matrix. A major contribution of this research involved speciation analysis of selenium in blood serum, seminal plasma and urine. Commercial selenium supplements were consumed over 28 days and the effect that this had on selenium levels (total and species) within the human body fluids was investigated. Consumption caused an increase in the levels of selenium within all human body fluids and in general, the total level of selenium was found to be higher than the sum of the species present. An in-vitro bioavailability procedure was performed on the supplements and showed that two selenium yeast commercial products contained different selenium species. Some selenium species were identified and the implications of this are discussed.
Subjects/Keywords: 612; Trace elements
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APA (6th Edition):
Adair, J. (2002). Trace element and selenium speciation analysis of human body fluids by ICP-MS. (Doctoral Dissertation). University of Surrey. Retrieved from http://epubs.surrey.ac.uk/843747/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248076
Chicago Manual of Style (16th Edition):
Adair, Jill. “Trace element and selenium speciation analysis of human body fluids by ICP-MS.” 2002. Doctoral Dissertation, University of Surrey. Accessed January 29, 2020.
http://epubs.surrey.ac.uk/843747/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248076.
MLA Handbook (7th Edition):
Adair, Jill. “Trace element and selenium speciation analysis of human body fluids by ICP-MS.” 2002. Web. 29 Jan 2020.
Vancouver:
Adair J. Trace element and selenium speciation analysis of human body fluids by ICP-MS. [Internet] [Doctoral dissertation]. University of Surrey; 2002. [cited 2020 Jan 29].
Available from: http://epubs.surrey.ac.uk/843747/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248076.
Council of Science Editors:
Adair J. Trace element and selenium speciation analysis of human body fluids by ICP-MS. [Doctoral Dissertation]. University of Surrey; 2002. Available from: http://epubs.surrey.ac.uk/843747/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248076
Univerzitet u Beogradu
23.
Tulić, Lidija, 1978- 30651495.
Oksidativni stres i ravnoteža bioelemenata kod
pacijentkinja u postupku vantelesnog oplođenja.
Degree: Medicinski fakultet, 2020, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:20805/bdef:Content/get
► Ginekologija i akušerstvo - Humana reprodukcija / Gynecology and Obstetrics - Human Reproduction
Uvod: Oksidativni stres dešava se usled neuravnoteženog odnosa pro-oksidanata i antioksidanata u…
(more)
▼ Ginekologija i akušerstvo - Humana reprodukcija /
Gynecology and Obstetrics - Human Reproduction
Uvod: Oksidativni stres dešava se usled
neuravnoteženog odnosa pro-oksidanata i antioksidanata u prilog
poslednjih. Odnos može biti poremećen zbog povećane koncentracije
reaktivnih kiseoničnih vrsta (ROS) i/ili umanjene antioksidativne
odbrane. Normalne fiziološke funkcije, uključujući proces
signalizacije ćelija, proliferacije i diferencijacije, zavise od
prisustva određenih koncentracija ROS. U reproduktivnom traktu,
fiziološki nivoi ROS neophodni su ne samo za ovulaciju, već i za
interakciju oocita-spermatozoid, fertilizaciju, implantaciju i rani
razvoj embriona. Ipak, povećana produkcija ROS može da ošteti
prirodnu antioksidativnu odbranu organizma, remeteći mikrosredinu u
reproduktivnom traktu i normalne fiziološke reakcije. Razumevanje
uloge ROS u ženskom infertilitetu i dalje je nepotpuno. Činjenica
da su oksidativni i antioksidativni sistem prisutni u različitim
ženskim reproduktivnim tkivima sugeriše da infertilitet i određenja
reproduktivna oboljenja mogu biti uzrokovana, makar delimično,
oksidativnim stresom. Već godinama se sve više smatra da
oksidativni stres (OS) ima negativan uticaj na reproduktivne
sposbnosti i muškaraca i žena. Doprinos OS patogenezi infertiliteta
sve se obimnije ispituje u oblasti muškog infertiliteta, posebno u
pogledu uticaja na različite aspekte kvaliteta spermatozoida. Cilj:
Ciljevi ove studije bili su da se kod pacijenata uključenih u
postupak VTO ispita uticaj različitih protokola kontrolisane
ovarijalne stimulacije (KOS), doze gonadotropina, promene
koncetracija parametara OS pre stimulacije i posle stimulacije na
ishod IVF postupka. Takođe smo ispitivali povezanost promene
koncentracije parametara oksidativnog stresa, poremećaja ravnoteže
bioelemenata i uticaj toksičnih metala kod žena na ishod IVF
postupka kod žena, dok smo kod muških partnera ispitivali
povezanosti promene koncentracija parametara oksidativnog stresa,
poremećaja ravnoteže bioelemenata i uticaj toksičnih metala sa
parametrima spermograma i ispitivali uticaj parametara spermograma
na ishod postupka...
Advisors/Committee Members: Vidaković, Snežana, 1960- 12562279.
Subjects/Keywords: oxidative stress; trace elements; toxic metals;
IVF
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APA (6th Edition):
Tulić, Lidija, 1. 3. (2020). Oksidativni stres i ravnoteža bioelemenata kod
pacijentkinja u postupku vantelesnog oplođenja. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:20805/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tulić, Lidija, 1978- 30651495. “Oksidativni stres i ravnoteža bioelemenata kod
pacijentkinja u postupku vantelesnog oplođenja.” 2020. Thesis, Univerzitet u Beogradu. Accessed January 29, 2020.
https://fedorabg.bg.ac.rs/fedora/get/o:20805/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tulić, Lidija, 1978- 30651495. “Oksidativni stres i ravnoteža bioelemenata kod
pacijentkinja u postupku vantelesnog oplođenja.” 2020. Web. 29 Jan 2020.
Vancouver:
Tulić, Lidija 13. Oksidativni stres i ravnoteža bioelemenata kod
pacijentkinja u postupku vantelesnog oplođenja. [Internet] [Thesis]. Univerzitet u Beogradu; 2020. [cited 2020 Jan 29].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:20805/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tulić, Lidija 13. Oksidativni stres i ravnoteža bioelemenata kod
pacijentkinja u postupku vantelesnog oplođenja. [Thesis]. Univerzitet u Beogradu; 2020. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:20805/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Georgia Tech
24.
Hornstein, J. Virgil (Julius Virgil).
New methods for improving sensitivity in trace analysis.
Degree: PhD, Chemistry, 1978, Georgia Tech
URL: http://hdl.handle.net/1853/29846
Subjects/Keywords: Trace elements Analysis
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to Zotero / EndNote / Reference
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APA (6th Edition):
Hornstein, J. V. (. V. (1978). New methods for improving sensitivity in trace analysis. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/29846
Chicago Manual of Style (16th Edition):
Hornstein, J Virgil (Julius Virgil). “New methods for improving sensitivity in trace analysis.” 1978. Doctoral Dissertation, Georgia Tech. Accessed January 29, 2020.
http://hdl.handle.net/1853/29846.
MLA Handbook (7th Edition):
Hornstein, J Virgil (Julius Virgil). “New methods for improving sensitivity in trace analysis.” 1978. Web. 29 Jan 2020.
Vancouver:
Hornstein JV(V. New methods for improving sensitivity in trace analysis. [Internet] [Doctoral dissertation]. Georgia Tech; 1978. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/1853/29846.
Council of Science Editors:
Hornstein JV(V. New methods for improving sensitivity in trace analysis. [Doctoral Dissertation]. Georgia Tech; 1978. Available from: http://hdl.handle.net/1853/29846
Georgia Tech
25.
Myers, Gary Lee.
Investigations in the field of trace analysis.
Degree: PhD, Chemistry, 1975, Georgia Tech
URL: http://hdl.handle.net/1853/30068
Subjects/Keywords: Trace elements Analysis
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APA (6th Edition):
Myers, G. L. (1975). Investigations in the field of trace analysis. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/30068
Chicago Manual of Style (16th Edition):
Myers, Gary Lee. “Investigations in the field of trace analysis.” 1975. Doctoral Dissertation, Georgia Tech. Accessed January 29, 2020.
http://hdl.handle.net/1853/30068.
MLA Handbook (7th Edition):
Myers, Gary Lee. “Investigations in the field of trace analysis.” 1975. Web. 29 Jan 2020.
Vancouver:
Myers GL. Investigations in the field of trace analysis. [Internet] [Doctoral dissertation]. Georgia Tech; 1975. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/1853/30068.
Council of Science Editors:
Myers GL. Investigations in the field of trace analysis. [Doctoral Dissertation]. Georgia Tech; 1975. Available from: http://hdl.handle.net/1853/30068
Hong Kong University of Science and Technology
26.
Wang, Wenhao.
Geochemical behavior of trace metals in a contaminated estuary : phase partitioning, porewater dynamics and anthropogenic impacts.
Degree: 2016, Hong Kong University of Science and Technology
URL: http://repository.ust.hk/ir/Record/1783.1-87399
;
https://doi.org/10.14711/thesis-b1627034
;
http://repository.ust.hk/ir/bitstream/1783.1-87399/1/th_redirect.html
► Severe metal pollution due to industrial effluent releases has been documented in Jiulong River estuary which locates in Fujian Province, southern China. In the present…
(more)
▼ Severe metal pollution due to industrial effluent releases has been documented in Jiulong River estuary which locates in Fujian Province, southern China. In the present study, time-series based water samplings were conducted during effluent discharge events to reveal the metal partitioning in the dissolved, particulate and colloidal phases. Different behaviors of metals in the dissolved fraction against salinity indicated different sources. Enhanced adsorption as well as formation of particulates resulted in elevated partitioning for Cu and Zn during the mixing process. Colloidal metals displayed positive correlations with dissolved or colloidal organic carbon, while constant colloidal partitioning suggested the excess binding capacity. Diffusive gradient in thin films (DGT) technique was then employed together with sediment cores to study the porewater dynamics of trace metals as well as benthic exchange fluxes. With the redox condition showing spatial and temporal variations, precipitation as sulfides and adsorption onto Mn/Fe (hydr)oxides were important in scavenging metals from porewaters in this estuarine area. Estimated fluxes at sediment-water interface indicated the overlying water as a major source for trace metals, whereas sediment could also be the source if surface remobilization dominated. In addition, taking advantage of flow field-flow fractionation (FlFFF) technique, colloidal size distribution of organic matter and metals was quantified. A dominance of dissolved metals in the 1-10 kDa fraction was demonstrated, which was regulated by terrestrial fulvic acid input. The small sized colloidal organic complexes were responsible for stabilizing trace metals. And variations in particle size fractions indicated different sources, fates and geochemical controls of the metals. Our results highlighted the impacts of both natural and anthropogenic processes on trace metal behaviors in the dynamic system. Results from these studies will further provide information on metal toxicity prediction, environmental impact assessment and pollution mitigation.
Subjects/Keywords: Estuarine pollution
; Environmental aspects
; Trace elements
; Biogeochemistry
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APA (6th Edition):
Wang, W. (2016). Geochemical behavior of trace metals in a contaminated estuary : phase partitioning, porewater dynamics and anthropogenic impacts. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-87399 ; https://doi.org/10.14711/thesis-b1627034 ; http://repository.ust.hk/ir/bitstream/1783.1-87399/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wang, Wenhao. “Geochemical behavior of trace metals in a contaminated estuary : phase partitioning, porewater dynamics and anthropogenic impacts.” 2016. Thesis, Hong Kong University of Science and Technology. Accessed January 29, 2020.
http://repository.ust.hk/ir/Record/1783.1-87399 ; https://doi.org/10.14711/thesis-b1627034 ; http://repository.ust.hk/ir/bitstream/1783.1-87399/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wang, Wenhao. “Geochemical behavior of trace metals in a contaminated estuary : phase partitioning, porewater dynamics and anthropogenic impacts.” 2016. Web. 29 Jan 2020.
Vancouver:
Wang W. Geochemical behavior of trace metals in a contaminated estuary : phase partitioning, porewater dynamics and anthropogenic impacts. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2016. [cited 2020 Jan 29].
Available from: http://repository.ust.hk/ir/Record/1783.1-87399 ; https://doi.org/10.14711/thesis-b1627034 ; http://repository.ust.hk/ir/bitstream/1783.1-87399/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wang W. Geochemical behavior of trace metals in a contaminated estuary : phase partitioning, porewater dynamics and anthropogenic impacts. [Thesis]. Hong Kong University of Science and Technology; 2016. Available from: http://repository.ust.hk/ir/Record/1783.1-87399 ; https://doi.org/10.14711/thesis-b1627034 ; http://repository.ust.hk/ir/bitstream/1783.1-87399/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Simon Fraser University
27.
Maes, Daniel Henry.
Trace element concentration patterns in human hairs. – .
Degree: 1975, Simon Fraser University
URL: http://summit.sfu.ca/item/4338
Subjects/Keywords: Hair.; Trace elements.
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APA ·
Chicago ·
MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Maes, D. H. (1975). Trace element concentration patterns in human hairs. – . (Thesis). Simon Fraser University. Retrieved from http://summit.sfu.ca/item/4338
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Maes, Daniel Henry. “Trace element concentration patterns in human hairs. – .” 1975. Thesis, Simon Fraser University. Accessed January 29, 2020.
http://summit.sfu.ca/item/4338.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Maes, Daniel Henry. “Trace element concentration patterns in human hairs. – .” 1975. Web. 29 Jan 2020.
Vancouver:
Maes DH. Trace element concentration patterns in human hairs. – . [Internet] [Thesis]. Simon Fraser University; 1975. [cited 2020 Jan 29].
Available from: http://summit.sfu.ca/item/4338.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Maes DH. Trace element concentration patterns in human hairs. – . [Thesis]. Simon Fraser University; 1975. Available from: http://summit.sfu.ca/item/4338
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Michigan State University
28.
Price, Michael Lee.
Trace element distribution in the native copper from the Centennial Number 3 Mine, Houghton County, Michigan.
Degree: MS, 1977, Michigan State University
URL: http://etd.lib.msu.edu/islandora/object/etd:37282
Subjects/Keywords: Copper; Trace elements
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APA (6th Edition):
Price, M. L. (1977). Trace element distribution in the native copper from the Centennial Number 3 Mine, Houghton County, Michigan. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:37282
Chicago Manual of Style (16th Edition):
Price, Michael Lee. “Trace element distribution in the native copper from the Centennial Number 3 Mine, Houghton County, Michigan.” 1977. Masters Thesis, Michigan State University. Accessed January 29, 2020.
http://etd.lib.msu.edu/islandora/object/etd:37282.
MLA Handbook (7th Edition):
Price, Michael Lee. “Trace element distribution in the native copper from the Centennial Number 3 Mine, Houghton County, Michigan.” 1977. Web. 29 Jan 2020.
Vancouver:
Price ML. Trace element distribution in the native copper from the Centennial Number 3 Mine, Houghton County, Michigan. [Internet] [Masters thesis]. Michigan State University; 1977. [cited 2020 Jan 29].
Available from: http://etd.lib.msu.edu/islandora/object/etd:37282.
Council of Science Editors:
Price ML. Trace element distribution in the native copper from the Centennial Number 3 Mine, Houghton County, Michigan. [Masters Thesis]. Michigan State University; 1977. Available from: http://etd.lib.msu.edu/islandora/object/etd:37282
29.
Shilulu, Irene.
Potential of Selenium(Se) accumulation among pearl millet[Pennisetum glaucum(L.) R.Br.) genotypes.
Degree: 2015, University of Zimbabwe
URL: http://dspace.unza.zm/handle/123456789/3715
► Beneficial effects of selenium (Se) can be delivered to humans through enriched plant foods. However, breeding plants to be more efficient at Se accumulation can…
(more)
▼ Beneficial effects of selenium (Se) can be delivered to humans through enriched plant foods. However, breeding plants to be more efficient at Se accumulation can complement enrichment efforts. This study was aimed at determining the inheritance of Se accumulation for the purpose of developing varieties of pearl millet (Pennisetum glaucum (L.) R. Br.) which accumulate high Se. In doing this the first step involved the determination of the magnitude of genetic variation in the Se content as a proxy for Se accumulation ability of the selected pearl millet genotypes followed by the determination of the gene action and heritability conditioning the Se accumulation trait. Thirty seven genotypes were screened for Se accumulation in a field experiment during 2011/2012 cropping season at University of Zambia (UNZA) Field Station. These genotypes were sprayed with Se in the form of sodium selenate (Na2SeO4) at a rate of 2 mg L-1 (288 m3 ha-1) through foliar application during vegetative stage, 30 days after emergence. The crop was grown to maturity and grains harvested. The grain samples were analysed for Se accumulation using the Atomic Absorption Spectrophotometer fitted with Graphite furnace (AAS-GF). The screened genotypes were further crossed in a North Carolina Design (NCD) II mating scheme, using 12 male and 25 female parents during 2012 offseason at National Irrigation Research Stations (NIRS), Nanga, Southern province of Zambia. The progenies were evaluated for Se accumulation and important agronomic traits in three sets in a Randomised Complete Block Design (RCBD). These progenies were also sprayed with Se and grain samples were analysed for accumulated Se following the same procedure as for parents. The Se analyses for the parental genotypes showed high coefficient of variation (CV) values of 135% for non-sprayed and 156% for sprayed genotypes, indicating the wide inherent genetic variability for grain Se accumulation among pearl millet genotypes. Out of 37 genotypes screened, before spraying, 29 were identified as Se accumulators while 8 were non-accumulators, however after spraying, 35 were designated as Se accumulators and 2 as non- accumulators. The amount of Se accumulated among the non-sprayed parental genotypes ranged from the lowest 0.00 μg g-1 to highest 0.09 μg g-1 for 570028 R1w and SDMV 59009 respectively while among the sprayed genotypes, the lowest was 0.01μg g-1 for 570028 R1w and highest was 0.63μg g-1 for NLC-C3. Significant (P<0.05) differences in Se accumulation were also observed among crosses and the range across sets was 0.08 – 0.62 μg g-1. The overall highest accumulator among all the crosses was ZPMDC x NEC-C3 (0.62 μg g-1) from set I while the overall lowest accumulator was NLBC-C3 x TARAM (0.08 μg g-1) from set III. This result indicated that pearl millet has the potential to accumulate Se and a wide genetic variation in grain Se accumulation exists in pearl millet genotypes. Significant (p<0.05) strong positive correlation (r=0.652) was noted between days to 50% flowering and Se…
Subjects/Keywords: Pearl Millet-Anatomy; Pearl Millet-Varieties; Plants-Effects of trace elements.; Trace Elements
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APA ·
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APA (6th Edition):
Shilulu, I. (2015). Potential of Selenium(Se) accumulation among pearl millet[Pennisetum glaucum(L.) R.Br.) genotypes. (Thesis). University of Zimbabwe. Retrieved from http://dspace.unza.zm/handle/123456789/3715
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shilulu, Irene. “Potential of Selenium(Se) accumulation among pearl millet[Pennisetum glaucum(L.) R.Br.) genotypes.” 2015. Thesis, University of Zimbabwe. Accessed January 29, 2020.
http://dspace.unza.zm/handle/123456789/3715.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shilulu, Irene. “Potential of Selenium(Se) accumulation among pearl millet[Pennisetum glaucum(L.) R.Br.) genotypes.” 2015. Web. 29 Jan 2020.
Vancouver:
Shilulu I. Potential of Selenium(Se) accumulation among pearl millet[Pennisetum glaucum(L.) R.Br.) genotypes. [Internet] [Thesis]. University of Zimbabwe; 2015. [cited 2020 Jan 29].
Available from: http://dspace.unza.zm/handle/123456789/3715.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shilulu I. Potential of Selenium(Se) accumulation among pearl millet[Pennisetum glaucum(L.) R.Br.) genotypes. [Thesis]. University of Zimbabwe; 2015. Available from: http://dspace.unza.zm/handle/123456789/3715
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Namibia
30.
Vellemu, Emmanuel C.
Assessment of trace metals pollution along the Central Namibian marine coastline: using Choromytilus Meridionalis (Black Mussel) as indicator organisms.
Degree: 2014, University of Namibia
URL: http://hdl.handle.net/11070/776
► This study was carried out at four stations along the Central Namibian marine coastline towns (Walvis Bay, Swakopmund, Henties Bay and Cape Cross) to assess…
(more)
▼ This study was carried out at four stations along the Central Namibian marine coastline towns (Walvis Bay, Swakopmund, Henties Bay and Cape Cross) to assess trace metals pollution using Choromytilus meridionalis as indicator organism. Samples were collected using randomized sampling techniques during winter and summer months of 2012. EPA 3050B and ICP-OES protocols were used to digest and assimilate the samples. Data were analysed using a 4x2x3 factorial model of a completely randomised design and results showed there was a significant interaction (p < 0.05) of only Pb and Fe levels between stations, seasons and substrates studied. However, there was no significant interaction (p > 0.05) between Cu and Zn levels between stations, substrates and seasons respectively. Metal levels in mussels and sediments ranked in the order: Fe > Zn > Cu > Pb. Walvis Bay recorded increased metal levels (P < 0.05) than other stations probably due to factors like port activities e.g. ship repairs, urban and residential settlements, tourism and recreation as well as run-off water from catchment areas. Sediments exhibited significantly higher mean trace metals than mussels and water (P < 0.05). In addition, clear-cut significant correlation (p < 0.05) of metals was observed between some stations and substrates. Maximum Fe, Zn, Cu, and Pb mean values in mussels were 483.7, 79.3, 6.50, and 2.30 ppm of sample dry weight respectively while maximum Fe, Zn, Pb; and Cu values in sediments were 44, 749.90, 100.0, 79.30 and 50.50 ppm of sample dry weight respectively. All metal values recorded in this study were lower or within those reported elsewhere. Overall, mussels grown in this part of the coastline could be regarded safe for human consumption; however, levels observed in samples from Walvis Bay are of health concerns. Findings from this study have stressed the need for continued monitoring of these metals along the Namibian marine shoreline for regulatory purposes.
Subjects/Keywords: Trace metals pollution
;
Marine pollution
;
Trace elements in water
;
Trace elements in water, Environmental aspects.
;
Mussels
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APA (6th Edition):
Vellemu, E. C. (2014). Assessment of trace metals pollution along the Central Namibian marine coastline: using Choromytilus Meridionalis (Black Mussel) as indicator organisms.
(Thesis). University of Namibia. Retrieved from http://hdl.handle.net/11070/776
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Vellemu, Emmanuel C. “Assessment of trace metals pollution along the Central Namibian marine coastline: using Choromytilus Meridionalis (Black Mussel) as indicator organisms.
” 2014. Thesis, University of Namibia. Accessed January 29, 2020.
http://hdl.handle.net/11070/776.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Vellemu, Emmanuel C. “Assessment of trace metals pollution along the Central Namibian marine coastline: using Choromytilus Meridionalis (Black Mussel) as indicator organisms.
” 2014. Web. 29 Jan 2020.
Vancouver:
Vellemu EC. Assessment of trace metals pollution along the Central Namibian marine coastline: using Choromytilus Meridionalis (Black Mussel) as indicator organisms.
[Internet] [Thesis]. University of Namibia; 2014. [cited 2020 Jan 29].
Available from: http://hdl.handle.net/11070/776.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Vellemu EC. Assessment of trace metals pollution along the Central Namibian marine coastline: using Choromytilus Meridionalis (Black Mussel) as indicator organisms.
[Thesis]. University of Namibia; 2014. Available from: http://hdl.handle.net/11070/776
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations
