subject:(shell morphology)

McMaster University

1. Yousif, Mariam. Warped Ideas: Geometric Morphometrics as a Complementary Technique for Studying Gastropod Shell Morphology.

Degree: MSc, 2012, McMaster University

URL: http://hdl.handle.net/11375/12472

►

Geometric morphometrics (GM) provides a complementary method for studying morphology. Snails have been analyzed in the field of morphometrics since the 1960s because their… (more)

Subjects/Keywords: Dimethoate; Geometric Morphometrics; Snail; Shell Morphology; Toxicology; Toxicology

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yousif, M. (2012). Warped Ideas: Geometric Morphometrics as a Complementary Technique for Studying Gastropod Shell Morphology. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/12472

Chicago Manual of Style (16^th Edition):

Yousif, Mariam. “Warped Ideas: Geometric Morphometrics as a Complementary Technique for Studying Gastropod Shell Morphology.” 2012. Masters Thesis, McMaster University. Accessed February 28, 2021. http://hdl.handle.net/11375/12472.

MLA Handbook (7^th Edition):

Yousif, Mariam. “Warped Ideas: Geometric Morphometrics as a Complementary Technique for Studying Gastropod Shell Morphology.” 2012. Web. 28 Feb 2021.

Vancouver:

Yousif M. Warped Ideas: Geometric Morphometrics as a Complementary Technique for Studying Gastropod Shell Morphology. [Internet] [Masters thesis]. McMaster University; 2012. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/11375/12472.

Council of Science Editors:

Yousif M. Warped Ideas: Geometric Morphometrics as a Complementary Technique for Studying Gastropod Shell Morphology. [Masters Thesis]. McMaster University; 2012. Available from: http://hdl.handle.net/11375/12472

University of Michigan

2. Li, Jingchun. Evolutionary Diversification of the Marine Bivalve Clade Galeommatoidea.

Degree: PhD, Ecology and Evolutionary Biology, 2014, University of Michigan

URL: http://hdl.handle.net/2027.42/109049

► This dissertation investigates the diversification and morphological evolution of a major extant marine invertebrate lineage - the bivalve superfamily Galeommatoidea. It is inspired by the… (more)

▼ This dissertation investigates the diversification and morphological evolution of a major extant marine invertebrate lineage - the bivalve superfamily Galeommatoidea. It is inspired by the increasing realization among macroevolutionary biologists that the interplay between abiotic and biotic factors has shaped global biodiversity through time and that biotic interactions cannot be ignored if we wish to reconcile theory with natural systems. Galeommatoidea is a particularly apt group for understanding the interactions between abitoic and biotic diversification drivers because it contains large numbers of obligate commensal as well as free-living species and is therefore amenable to comparative approaches. I examined the ecological and evolutionary patterns of free-living and commensal galeommatoidean species on three levels: 1) on a microevolutionary level, focusing on commensal species that occupy multiple hosts; 2) on a regional level, for a faunal assemblage of galeommatoidean taxa that span three well-defined biogeographic provinces in southern Australia; 3) on a global level, for the entire superfamily. My ecological synthesis (Ch.2) suggests that the free-living lifestyle is strongly correlated with living in hard-bottom habitats while the commensal lifestyle is an adaptation for living in sediments. Commensal associations with bioturbating hosts allow the small-bodied clams to attain refuges at depth from predation while remaining oxygenated through their hosts' bioturbation. A case study on Neaeromya rugifera (Ch.3) indicates that clam populations occupying different hosts differ significantly in shell morphologies, but do not show host-specific genetic structuring. Regional phylogeographic analyses of an endemic Australian galeommatoidean species (Ch.4) show that the interaction of the Middle Miocene Climate Transition with the specific geography of the southern coastline of Australia was the primary cladogenic driver in this group. Macroevolutionary study of Galeommatoidea (Ch.5) reveals that a major free-living clade exhibits higher rates of lineage diversification compared to the commensals, possibly driven by complex ecological interactions in coral reef ecosystems. However, commensal species exhibit higher morphological disparity and intercladal convergence, likely reflecting host-specific morphological adaptations. Taken together, my multi-level study demonstrates that the present diversity of Galeommatoidea is shaped by the inseparable interactions between abiotic and biotic factors. Advisors/Committee Members: O'Foighil, Diarmaid (committee member), Baumiller, Tomasz K. (committee member), Rabosky, Daniel (committee member), Knowles, L. Lacey (committee member), Badgley, Catherine E. (committee member).

Subjects/Keywords: Marine Biodiversity; Bivalve; Macroevolution; Commensalism; Galeommatoidea; Shell Morphology; Ecology and Evolutionary Biology; Science

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Li, J. (2014). Evolutionary Diversification of the Marine Bivalve Clade Galeommatoidea. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/109049

Chicago Manual of Style (16^th Edition):

Li, Jingchun. “Evolutionary Diversification of the Marine Bivalve Clade Galeommatoidea.” 2014. Doctoral Dissertation, University of Michigan. Accessed February 28, 2021. http://hdl.handle.net/2027.42/109049.

MLA Handbook (7^th Edition):

Li, Jingchun. “Evolutionary Diversification of the Marine Bivalve Clade Galeommatoidea.” 2014. Web. 28 Feb 2021.

Vancouver:

Li J. Evolutionary Diversification of the Marine Bivalve Clade Galeommatoidea. [Internet] [Doctoral dissertation]. University of Michigan; 2014. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/2027.42/109049.

Council of Science Editors:

Li J. Evolutionary Diversification of the Marine Bivalve Clade Galeommatoidea. [Doctoral Dissertation]. University of Michigan; 2014. Available from: http://hdl.handle.net/2027.42/109049

3. Lata, Sneh. Studies on morphology gametogenesis and egg shell formation of some cestodes;.

Degree: Zoology, 2015, Chaudhary Charan Singh University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/34145

None newline

Refrences p. 129-157, Summary p. 122-127

Advisors/Committee Members: Pandey, K C.

Subjects/Keywords: Morphology Gametogenesis; Egg Shell Formation; Cestodes

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lata, S. (2015). Studies on morphology gametogenesis and egg shell formation of some cestodes;. (Thesis). Chaudhary Charan Singh University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/34145

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lata, Sneh. “Studies on morphology gametogenesis and egg shell formation of some cestodes;.” 2015. Thesis, Chaudhary Charan Singh University. Accessed February 28, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/34145.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lata, Sneh. “Studies on morphology gametogenesis and egg shell formation of some cestodes;.” 2015. Web. 28 Feb 2021.

Vancouver:

Lata S. Studies on morphology gametogenesis and egg shell formation of some cestodes;. [Internet] [Thesis]. Chaudhary Charan Singh University; 2015. [cited 2021 Feb 28]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/34145.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lata S. Studies on morphology gametogenesis and egg shell formation of some cestodes;. [Thesis]. Chaudhary Charan Singh University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/34145

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Macquarie University

4. Liu, Deming. Controlled engineering of rare-earth doped core-shell nanocrystals.

Degree: 2016, Macquarie University

URL: http://hdl.handle.net/1959.14/1252700

►

Thesis by publication.

1. Introduction – 2. Emission stability and reversibility of homogeneous core-shell upconversion nanocrystals – 3. Longitudinal growth and transversal growth of NaREF4… (more)

▼

Thesis by publication.

1. Introduction – 2. Emission stability and reversibility of homogeneous core-shell upconversion nanocrystals – 3. Longitudinal growth and transversal growth of NaREF4 nanocrystals – 4. Programmable growth of 3D shapes of heterogeneous nanocrystals – 5. Conclusions and future scope – Appendices.

Controlled engineering of rare-earth doped core-shell nanocrystals to improve the original physical and chemical properties, and to integrate multiple functionalities in one particle with desirable size and shape, promises a huge potential in enabling new nanotechnologies, such as ultra-sensitive bio-sensing, multi-modal biomedical imaging,targeted delivery and release of drugs, high efficiency hybrid catalyst, green energy harvesting, lightening, and 3D volumetric displays.

This thesis focuses on exploring the epitaxial shell growth of nanocrystals as an efficient method for controlled synthesis of rare-earth doped core-shell nanocrystals. I demonstrate that wet-chemical synthesis can be developed as a very promising approach towards the high-yield, low-cost and mass production of a library of new types of heterogeneous nanocrystal in the solution phase. Particularly, I find that much more freedom and flexibility of control shell growth of nanocrystal can be achieved in wet chemical synthesis.

This thesis starts with a comprehensive review of controlled growth of nanomaterials with particular focus on the recent development of rare-earth doped (core-shell) nanomaterials.The thesis has two major parallel projects to investigate techniques to enable the unidirectional synthesis with uniform shells (chapter 2) and directional controlled growth of heterogeneous shells (chapters 3 and 4) respectively.

Chapter 2 reports a simple technique for homogeneous shell growth by adjusting the amount of oleylamine. I extend this technique to study the upconversion emission stability and reversibility at different pH and temperature conditions. By controlled synthesis of the homogeneous core-shell nanocrystals via adjusting the ratio of oleic acid and oleylamine, I find that the intact shells at controlled thickness are useful in fully protecting the core nanocrystal from quenching by the surface ligands and solvent. I demonstrate the passivation effect by the intact shells will not only enhance the luminescence intensity but also improve the emission stability against temperature and pH variations for biomedical applications.

In Chapters 3 and 4, I systemically study the reaction mechanisms of the epitaxial shell growth of rare earth fluoride nanocrystal in wet chemical synthesis. I find that oleateanions (OA-), as the dissociated form of oleic acid molecules (OAH), have variable, dynamic roles in mediating the growth of alkaline rare-earth fluoride (AREF₄) nanocrystals. I demonstrate that the control over the ratio of OA- to OAH can be used to directionally inhibit,promote, or etch the crystallographic facets of the nanoparticles. This control enables selective grafting of shells with…

Advisors/Committee Members: Macquarie University. Department of Physics and Astronomy.

Subjects/Keywords: Nanocrystals – Research; Rare earth metals – Analysis; epitaxial shell growth; nanocrystal engineering; nanocrystals; core-shell; heterogeneous structure; NaYF₄; rare earth fluorides; lanthanides; upconversion; morphology control

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Liu, D. (2016). Controlled engineering of rare-earth doped core-shell nanocrystals. (Doctoral Dissertation). Macquarie University. Retrieved from http://hdl.handle.net/1959.14/1252700

Chicago Manual of Style (16^th Edition):

Liu, Deming. “Controlled engineering of rare-earth doped core-shell nanocrystals.” 2016. Doctoral Dissertation, Macquarie University. Accessed February 28, 2021. http://hdl.handle.net/1959.14/1252700.

MLA Handbook (7^th Edition):

Liu, Deming. “Controlled engineering of rare-earth doped core-shell nanocrystals.” 2016. Web. 28 Feb 2021.

Vancouver:

Liu D. Controlled engineering of rare-earth doped core-shell nanocrystals. [Internet] [Doctoral dissertation]. Macquarie University; 2016. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/1959.14/1252700.

Council of Science Editors:

Liu D. Controlled engineering of rare-earth doped core-shell nanocrystals. [Doctoral Dissertation]. Macquarie University; 2016. Available from: http://hdl.handle.net/1959.14/1252700

Johannes Gutenberg Universität Mainz

5. Diesing, Till Moritz. Kern-Schale-Katalysatorsysteme in der Polyolefinpolymerisation.

Degree: 2009, Johannes Gutenberg Universität Mainz

URL: http://ubm.opus.hbz-nrw.de/volltexte/2010/2468/

►

Das Ziel der vorliegenden Arbeit war die Synthese eines Katalysatorpartikels, der in der Lage ist, in nur einem Polymerisationsschritt einen Kern-Schale-artigen Produktpartikel herzustellen, bei dem… (more)

▼

Das Ziel der vorliegenden Arbeit war die Synthese eines Katalysatorpartikels, der in der Lage ist, in nur einem Polymerisationsschritt einen Kern-Schale-artigen Produktpartikel herzustellen, bei dem zwei verschiedene Polyolefine jeweils ortsaufgelöst in der Schale bzw. im Kern vorhanden sein sollten. Dabei wurden zwei Grundbedingungen erfüllt: Optimale Trennung der verschiedenen Katalysatordomänen in Kern und Schale; diese Trennung durfte auch bei den in industriellen Polymerisationen herrschenden Reaktionsbedingungen (Druck, Scherkräfte, Temperatur, Lösungsmittel) nicht verloren gehen. Beibehaltung der Aktivität und Spezifität der einzelnen Katalysatoren; dabei muß besonderes Augenmerk auf den Kern gelegt werden, der ggf. durch die aufzutragende Schale nicht ausreichend mit Monomer versorgt wird oder während dem Aufbringen der Schale desaktiviert werden könnte. Die entwickelte Trägerungsroute besticht durch das simple Trägerungsverfahren des Schalenmaterials und des Schalenkatalysators, bedingt durch die Affinität der funktionalisierten Schalenpartikel mit dem Kernkatalysatorsystem. Die entwickelte Trägerungsroute kann industriell mit allen gängigen (Post)Metallocenen sowie (als Kernpartikel) Ziegler-Natta-Systemen anwendbar sein und ist hierdurch sehr flexibel.

The objective of the thesis was the synthesis of a catalyst particle, which is able to produce a core-shell-like product particle, consisting of two different polyolefins, in only one polymerization step. Two main conditions were fulfilled. Optimal separation between the two catalyst domains in the core and the shell. This separation had to persist under industrial polymerization conditions (pressure, temperature, solvents). Perpetuation of an optimal activity and specificity of the single catalysts, e.g. the activity of the catalyst in the core. Diffusion of the monomer to latter could be hindered by the shell material has to be assured. The shell material may deactivate the core catalyst. The advantage of the synthesis route which has been developed is that it is particularly easy to apply, as the shell catalyst support material interacts with the core catalyst system (auto-assembly). The route can be used with all typical industrial catalyst systems.

Subjects/Keywords: Katalysator; Polymer; Morphologie; Kern-Schale-Polymerisation; Polyolefin; catalyst; polymer; morphology; core-shell-polymerization; polyolefin; Chemistry and allied sciences

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Diesing, T. M. (2009). Kern-Schale-Katalysatorsysteme in der Polyolefinpolymerisation. (Doctoral Dissertation). Johannes Gutenberg Universität Mainz. Retrieved from http://ubm.opus.hbz-nrw.de/volltexte/2010/2468/

Chicago Manual of Style (16^th Edition):

Diesing, Till Moritz. “Kern-Schale-Katalysatorsysteme in der Polyolefinpolymerisation.” 2009. Doctoral Dissertation, Johannes Gutenberg Universität Mainz. Accessed February 28, 2021. http://ubm.opus.hbz-nrw.de/volltexte/2010/2468/.

MLA Handbook (7^th Edition):

Diesing, Till Moritz. “Kern-Schale-Katalysatorsysteme in der Polyolefinpolymerisation.” 2009. Web. 28 Feb 2021.

Vancouver:

Diesing TM. Kern-Schale-Katalysatorsysteme in der Polyolefinpolymerisation. [Internet] [Doctoral dissertation]. Johannes Gutenberg Universität Mainz; 2009. [cited 2021 Feb 28]. Available from: http://ubm.opus.hbz-nrw.de/volltexte/2010/2468/.

Council of Science Editors:

Diesing TM. Kern-Schale-Katalysatorsysteme in der Polyolefinpolymerisation. [Doctoral Dissertation]. Johannes Gutenberg Universität Mainz; 2009. Available from: http://ubm.opus.hbz-nrw.de/volltexte/2010/2468/

University of Michigan

6. Hanlan, Patricia Carole. The X-ray morphology of elliptical galaxies.

Degree: PhD, Pure Sciences, 1997, University of Michigan

URL: http://hdl.handle.net/2027.42/130483

► The hot interstellar medium found in most elliptical galaxies can offer a new window into the understanding of the dynamics of these objects. Using both… (more)

▼ The hot interstellar medium found in most elliptical galaxies can offer a new window into the understanding of the dynamics of these objects. Using both low and high angular resolution X-ray data from ROSAT, the behavior of the hot gas can be examined from the centers to the outer regions of these objects. Because of the low photon counts found in most ROSAT observations, we have developed extensive optimization and Monte Carlo simulation techniques to define the shape and the corresponding uncertainties of the isophotes of diffuse X-ray sources. If cooling gas is flowing towards the center of an elliptical galaxy and if angular momentum is conserved, disks of X-ray emitting material should form that will cause a flattening in the observed X-ray isophotes of the galaxy as one looks towards the center. However, we find that the predicted flattening does not, in general, occur. This implies that there might be transfer of angular momentum or turbulence in the hot gas in elliptical galaxies. We have developed the X-ray counterpart to the optical analysis of model-subtracted images, performing the analysis on a sample of elliptical shell galaxies. Any structure in the hot interstellar medium of an elliptical galaxy would imply a very recent ({<}10^8.5 years) merger event, since structure in a dissipationless gas will only last for a sound-crossing time or so. We have shown that there is statistical evidence that the X-ray emission from these galaxies is not consistent with a uniform β model, but we detected no direct correlations between optical substructure and X-ray morphology. The analysis technique created to examine the shape of X-ray emission in elliptical galaxies has been expanded to find not just a single ellipticity for an image, but to detect ellipticity gradients. Our current data make it difficult to detect shifts in morphology in all but the brightest galaxies, but as better observations are performed, this technique will take advantage of the new technologies to best determine the nuances in the morphology of elliptical galaxies. Advisors/Committee Members: Bregman, Joel N. (advisor).

Subjects/Keywords: Elliptical; Interstellar Medium; Morphology; Ray; Shell Galaxies

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hanlan, P. C. (1997). The X-ray morphology of elliptical galaxies. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/130483

Chicago Manual of Style (16^th Edition):

Hanlan, Patricia Carole. “The X-ray morphology of elliptical galaxies.” 1997. Doctoral Dissertation, University of Michigan. Accessed February 28, 2021. http://hdl.handle.net/2027.42/130483.

MLA Handbook (7^th Edition):

Hanlan, Patricia Carole. “The X-ray morphology of elliptical galaxies.” 1997. Web. 28 Feb 2021.

Vancouver:

Hanlan PC. The X-ray morphology of elliptical galaxies. [Internet] [Doctoral dissertation]. University of Michigan; 1997. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/2027.42/130483.

Council of Science Editors:

Hanlan PC. The X-ray morphology of elliptical galaxies. [Doctoral Dissertation]. University of Michigan; 1997. Available from: http://hdl.handle.net/2027.42/130483

Texas A&M University

7. Garza, Mark Isaac. Predator induced defenses in prey with diverse predators.

Degree: MS, Wildlife and Fisheries Sciences, 2006, Texas A&M University

URL: http://hdl.handle.net/1969.1/3309

► Phenotypic plasticity is an environmentally based change in phenotype and can be adaptive. Often, the change in an organism's phenotype is induced by the presence… (more)

▼ Phenotypic plasticity is an environmentally based change in phenotype and can be adaptive. Often, the change in an organism's phenotype is induced by the presence of a predator and serves as a defense against that predator. Defensive phenotypes are induced in freshwater physid snails in response to both crayfish and molluscivorous fish. Alternative morphologies are produced depending on which of these two predators snails are raised with, thus protecting them from each of these predators' unique mode of predation. Snails and other mollusks have been shown to produce thicker, differently shaped shells when found with predators relative to those found without predators. This production of thicker, differently shaped shells offers better protection against predators because of increased predator resistance. The first study in this thesis explores costs and limits to plasticity using the snailfish- crayfish system. I exposed juvenile physid snails (using a family structure) to either early or late shifts in predation regimes to assess whether developmental flexibility is equally possible early and late in development. Physid snails were observed to produce alternative defensive morphologies when raised in the presence of each of the two predators. All families responded similarly to the environment in which they were raised. Morphology was found to be heritable, but plasticity itself was not heritable. Morphology was found to become less flexible as snails progressed along their respective developmental pathways. In the second study, I raised physid snails with and without shell-crushing sunfish and examined the differences in shell thickness, shell mass, shell size and shell microstructural properties between the two treatment groups. Shells of snails raised with predators were found to be larger, thicker and more massive than those raised without predators, but differences in microstructure were found to be insignificant. I conclude that the observed shell thickening is accomplished by the snails' depositing more of the same material into their shells and not by producing a more complex shell composition. Advisors/Committee Members: DeWitt, Thomas J. (advisor), Coganto, Anthony I. (committee member), Fitzgerald, Lee (committee member).

Subjects/Keywords: inducible defenses; shell morphology; Physa; Lepomis microlophus; morphometrics

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Garza, M. I. (2006). Predator induced defenses in prey with diverse predators. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/3309

Chicago Manual of Style (16^th Edition):

Garza, Mark Isaac. “Predator induced defenses in prey with diverse predators.” 2006. Masters Thesis, Texas A&M University. Accessed February 28, 2021. http://hdl.handle.net/1969.1/3309.

MLA Handbook (7^th Edition):

Garza, Mark Isaac. “Predator induced defenses in prey with diverse predators.” 2006. Web. 28 Feb 2021.

Vancouver:

Garza MI. Predator induced defenses in prey with diverse predators. [Internet] [Masters thesis]. Texas A&M University; 2006. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/1969.1/3309.

Council of Science Editors:

Garza MI. Predator induced defenses in prey with diverse predators. [Masters Thesis]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/3309

8. Rusk, Adam Brett. Larval development of the New Zealand mussel Perna canaliculus and effects of cryopreservation .

Degree: 2013, AUT University

URL: http://hdl.handle.net/10292/5262

► The New Zealand green-lipped mussel, Perna canaliculus, is an important aquaculture species. This commercially attractive mussel species contributes over 70% of total aquaculture in New… (more)

▼ The New Zealand green-lipped mussel, Perna canaliculus, is an important aquaculture species. This commercially attractive mussel species contributes over 70% of total aquaculture in New Zealand, with exports in excess of $NZ 220 million. This industry relies heavily on wild-caught spat, which accounts for about 80% of seed requirements in mussel farming. This source of wild spat is unreliable and unpredictable. As a consequence, recent research focus has been directed at successfully rearing larvae to spat within hatchery settings. Previous research has been focussed at achieving high settlement rates, but this is highly variable due to seasonal variations and inconsistent rearing parameters. An alternative approach to utilising seasonally viable larvae is to cryopreserve (freeze) healthy Perna canaliculus larvae and thaw them on demand for hatchery production. This allows a year-round spat supply without the need to condition broodstock for out of season production. However, the success of this method also has been variable, often resulting in low survival rates. Part of the reason for this lack of success is that little is known about the thawing and post-thawing effects on larval viability and subsequent development. Overall, knowledge about the intricate developmental processes involved within the embryo or larval stages is lacking, and no detailed study has characterised these stages of larval development. Therefore, this study is the first to describe, in detail, larval development of Perna canaliculus from embryogenesis through to settlement in a hatchery environment. This project also included the first comprehensive investigation of the effects of cryopreservation for post-thawed trochophore (16 hours post-fertilisation) and D-stage (48 hours post-fertilisation) larvae through subsequent larval development. A multi-technique approach involving visual observations, scanning electron microscopy, histology, and immunochemistry were performed on larval samples collected daily through all stages of larval development over a 21-day rearing period. Cryopreserved and normal larvae were assessed daily through survivability, shell length, feeding consumption, shell morphology, organogenesis, and neurogenesis. Normally reared larvae had decreasing percent survival with the lowest survival values occurring at the pediveliger and post-settlement stage. Feeding consumption also varied over the 21-day rearing time period with a typically high feeding rate up to 15 days post-fertilisation to metamorphosis. Shell length was positively linear with little deviation except near the settlement stage where variations in shell growth were apparent. A low larval density (< 4%) was observed through to settlement and substrate attachment stages, which normally indicates competent settlement behaviour. For these normally reared larvae, embryogenesis was followed to a gastrula stage at 18 hours post-fertilisation, with the appearance of a blastopore, apical sense organ, and enclosing vegetal pole. D-stage larvae… Advisors/Committee Members: Alfaro, Andrea (advisor).

Subjects/Keywords: Larval development; Cryopreservation; Organogenesis; Neurogenesis; Shell morphology

…shell morphology, organogenesis, and neurogenesis. Normally reared larvae had decreasing… …systems. Shell morphology on Dstage larvae (2 days old) revealed a flat hinged, pitted… …differed slightly to trochophore larvae. Characterisation of shell morphology revealed… …embryogenesis and shell morphology of larvae through scanning electron microscopy, and light… …objectives are:  To describe shell morphology of larvae through scanning electron microscopy, and…

11 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rusk, A. B. (2013). Larval development of the New Zealand mussel Perna canaliculus and effects of cryopreservation . (Thesis). AUT University. Retrieved from http://hdl.handle.net/10292/5262

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rusk, Adam Brett. “Larval development of the New Zealand mussel Perna canaliculus and effects of cryopreservation .” 2013. Thesis, AUT University. Accessed February 28, 2021. http://hdl.handle.net/10292/5262.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rusk, Adam Brett. “Larval development of the New Zealand mussel Perna canaliculus and effects of cryopreservation .” 2013. Web. 28 Feb 2021.

Vancouver:

Rusk AB. Larval development of the New Zealand mussel Perna canaliculus and effects of cryopreservation . [Internet] [Thesis]. AUT University; 2013. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/10292/5262.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rusk AB. Larval development of the New Zealand mussel Perna canaliculus and effects of cryopreservation . [Thesis]. AUT University; 2013. Available from: http://hdl.handle.net/10292/5262

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

AUT University

9. Suneja, Shalini. The effects of cryopreservation on the Pacific oyster Crassostrea gigas larval development .

Degree: AUT University

URL: http://hdl.handle.net/10292/7861

► Aquaculture in New Zealand is an important growing export industry and around 66 % of its total production is exported, which is worth NZ 400… (more)

▼ Aquaculture in New Zealand is an important growing export industry and around 66 % of its total production is exported, which is worth NZ 400 million every year. Based on the growth strategy of this industry, the aim is to achieve an annual production of U.S 1 billion by 2025. In New Zealand, the Pacific oyster Crassostrea gigas, is a leading cultivated species with significant exports, along with King salmon and the New Zealand GreenshellTM mussel. Pacific oysters are native to Japan, but now are well established in many parts of the world including New Zealand. Most of the culturing for Pacific oyster in New Zealand is conducted using wild seed, the majority of which are gathered in the Kaipara Harbour on the north-western coast of the North Island. However, this source is highly unreliable, for example recent outbreaks of Ostreid herpesvirus-1 (OsHV-1) led to mass mortality of Pacific oyster larvae in 2010 leaving huge losses within this industry. To overcome these natural disasters and seasonal constraints, use of cryopreserved larvae has been suggested by many scientists. With this method of storing, larvae can be thawed to meet hatchery demands at any time. However, the degree of success using cryopreservation technique is highly variable due to lack of optimum protocols which are highly species specific. Furthermore, little is known about the freezing and cooling effects on the viability of larvae and their subsequent development. Previous studies have been focused on high survival rates just after post-thawing but recently the need to study the effect of cryopreservation on the larval quality over a longer time frame has been recognized. Before cryopreservation techniques can be applied to oyster larvae, a good understanding of the basic larval development process is necessary under normal conditions. There is lack of literature available on the detailed larval development under normal hatchery conditions for Pacific oysters. Therefore, the present study is the first to comprehensively describe the various stages of development from D-stage through to settlement of Pacific oyster Crassostrea gigas larvae under hatchery practices. To supplement this project, details of the effect of 2 cryoprotectant solutions (CPA) on the larval development from D-stage through to settlement is provided. To achieve the above aims, we used a multi-technique approach involving light microscopy, scanning electron microscopy, immunochemistry and direct visual observations. The findings indicate that these complementary techniques provide the best approach to investigate the larval stages of Pacific oysters. Both cryopreserved and normal (controls) larvae were assessed for survivability, feeding consumption, shell length, shell morphology, organogenesis and neurogenesis at regular intervals. The methodology of this study included a larval rearing process conducted at Cawthron Aquaculture Park, Nelson. Larval samples were isolated and fixed every alternate day and later transported to Auckland University of Technology on… Advisors/Committee Members: Alfaro, Andrea (advisor), Sebatian, Armagan (advisor).

Subjects/Keywords: Crassostrea gigas; Crassostrea; Cryopreservation; Oyster; Larval development; Shell morphology

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Suneja, S. (n.d.). The effects of cryopreservation on the Pacific oyster Crassostrea gigas larval development . (Thesis). AUT University. Retrieved from http://hdl.handle.net/10292/7861

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Suneja, Shalini. “The effects of cryopreservation on the Pacific oyster Crassostrea gigas larval development .” Thesis, AUT University. Accessed February 28, 2021. http://hdl.handle.net/10292/7861.

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Suneja, Shalini. “The effects of cryopreservation on the Pacific oyster Crassostrea gigas larval development .” Web. 28 Feb 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Suneja S. The effects of cryopreservation on the Pacific oyster Crassostrea gigas larval development . [Internet] [Thesis]. AUT University; [cited 2021 Feb 28]. Available from: http://hdl.handle.net/10292/7861.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

Council of Science Editors:

Suneja S. The effects of cryopreservation on the Pacific oyster Crassostrea gigas larval development . [Thesis]. AUT University; Available from: http://hdl.handle.net/10292/7861

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

10. Fu, Yang. Morphologie des mélanges ternaires PLA/PBAT/PA : Morphology of PLA/PBAT/PA ternary blends.

Degree: Docteur es, Mécanique numérique et Matériaux, 2017, Paris Sciences et Lettres (ComUE)

URL: http://www.theses.fr/2017PSLEM068

►

Ce travail vise à obtenir une morphologie cœur-peau directement lors du mélangeage à l’état fondu de polymères ternaires PLA/PBAT/PA. Le but final est d'améliorer la… (more)

▼

Ce travail vise à obtenir une morphologie cœur-peau directement lors du mélangeage à l’état fondu de polymères ternaires PLA/PBAT/PA. Le but final est d'améliorer la ténacité de l'acide polylactique (PLA). La morphologie des mélanges de polymères multi-phases est contrôlée par la thermodynamique du système. La morphologie des mélanges ternaires peut être prédite à partir des valeurs relatives des trois coefficients d'étalement caractérisant le triplet de polymères. Les coefficients d'étalement sont calculés à partir des valeurs des tensions interfaciales entre les composants binaires. La détermination des tensions interfaciales entre PLA, poly (butylène adipate-co-téréphtalate) (PBAT) et un copolyamide (PA) prédit une morphologie dispersée complexe dans la matrice PLA où les sous-inclusions PA sont partiellement encapsulées dans la phase PBAT. Cette morphologie a été obtenue par mélange à l'état fondu des trois composants, comme observé par les observations en microscopie électronique à balayage. Dans une seconde étape, une compatibilisation sélective a été utilisée pour modifier l'emplacement des sous-inclusions de PA. A cette fin, deux copolymères diblocs PBAT-b-PLA, PA-b-PBAT ont été synthétisés. La présence des copolymères diblocs nous permet de modifier la tension interfaciale des couples PLA/PBAT, PA/PBAT. Cette modification de l'équilibre de tension interfaciale modifie avec succès la morphologie, passant d’une semi-encapsulation à une encapsulation complète des sous-inclusions de PA dans les gouttes de PBAT. La performance mécanique de ce mélange ternaire a été évaluée.

This work aims at achieving direct core-shell morphologies in ternary PLA/PBAT/PA polymer blends by melt mixing. The final goal is to improve the toughness of polylactic acid (PLA). The morphology of multi-phase polymer blends is controlled by the thermodynamics of the system. The morphology of ternary blends can be predicted from the relative values of the three spreading coefficients characterizing the triplet of polymers. Spreading coefficients are calculated from the values of interfacial tensions between binary components. The determination of interfacial tensions between a PLA, a poly(butylene adipate-co-terephthalate) (PBAT) and a copolyamide (PA) predicts a complex dispersed morphology in the PLA matrix where PA subinclusions are partly encapsulated in the PBAT phase. This morphology was obtained by melt mixing the three components, as observed by scanning electron microscopy. In a second step, selective compatibilization was used to modify the PA sub-inclusion location. To this end, PBAT-b-PLA and PA-b-PBAT di-block copolymers were synthesized. The presence of the di-block copolymers enabled to modify the interfacial tension in PLA/PBAT and PA/PBAT. The modification of the interfacial tension balance was shown to successfully change the morphology from semi-encapsulation to full encapsulation of PA sub-inclusions in the PBAT drops. The mechanical performance of this ternary blend was evaluated.

Advisors/Committee Members: Navard, Patrick (thesis director), Peuvrel-Disdier, Edith (thesis director).

Subjects/Keywords: Polymers bio-Basés; Mélanges ternaires; Morphologie coeur-peau; Tension interfaciales; Bio-Based polymers; Ternary blend; Core-Shell morphology; Interfacial tension; 620.11

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fu, Y. (2017). Morphologie des mélanges ternaires PLA/PBAT/PA : Morphology of PLA/PBAT/PA ternary blends. (Doctoral Dissertation). Paris Sciences et Lettres (ComUE). Retrieved from http://www.theses.fr/2017PSLEM068

Chicago Manual of Style (16^th Edition):

Fu, Yang. “Morphologie des mélanges ternaires PLA/PBAT/PA : Morphology of PLA/PBAT/PA ternary blends.” 2017. Doctoral Dissertation, Paris Sciences et Lettres (ComUE). Accessed February 28, 2021. http://www.theses.fr/2017PSLEM068.

MLA Handbook (7^th Edition):

Fu, Yang. “Morphologie des mélanges ternaires PLA/PBAT/PA : Morphology of PLA/PBAT/PA ternary blends.” 2017. Web. 28 Feb 2021.

Vancouver:

Fu Y. Morphologie des mélanges ternaires PLA/PBAT/PA : Morphology of PLA/PBAT/PA ternary blends. [Internet] [Doctoral dissertation]. Paris Sciences et Lettres (ComUE); 2017. [cited 2021 Feb 28]. Available from: http://www.theses.fr/2017PSLEM068.

Council of Science Editors:

Fu Y. Morphologie des mélanges ternaires PLA/PBAT/PA : Morphology of PLA/PBAT/PA ternary blends. [Doctoral Dissertation]. Paris Sciences et Lettres (ComUE); 2017. Available from: http://www.theses.fr/2017PSLEM068

11. Kotsakiozi, Panayiota. Συγκριτική μελέτη φυσιολογικών προσαρμογών στα χερσαία σαλιγκάρια του γένους Codringtonia Kobelt 1898.

Degree: 2013, National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ)

URL: http://hdl.handle.net/10442/hedi/44287

► The genus Codringtonia (Gastropoda, Pulmonata) consists of eight species that are registeredin the Red List of endangered animals as vulnerable. Codringtonia species are distributedmainly in… (more)

▼ The genus Codringtonia (Gastropoda, Pulmonata) consists of eight species that are registeredin the Red List of endangered animals as vulnerable. Codringtonia species are distributedmainly in Greece and exhibit a mosaic distributional pattern. The genus’ endemism, its mosaicdistributional pattern, the small spatial scale of its differentiation and its unusual life cycle,turn the genus Codringtonia into one of the most interesting genera of terrestrial gastropods inGreece. From where, when, how and with what adaptations was its current distributionformed? Are there historical or ecological causes that led to this diversification? How didspecies diversify at the morphological and physiological level in space and time? These aresome of the issues that this Thesis is concerned with. Through a comparative framework, thatcontained all Codringtonia species I tried to address some of these concerns. This study is acomparative study of the physiological adaptations and the morphological evolution of theshell and this is the first comparative study conducted in this least studied region of Greece.Therefore, it sets the basis for similar studies that will follow regarding other groups oforganisms.The resolved phylogeny revealed that the genus Codringtonia differentiates in Greecefor the last 4.5 million years. The ancestral distribution area seems to have been central Greeceand then apparently through vicarianism and mainly through dispersal, Codringtonia speciesdifferentiated to the present species and occupied the present day distributional area. Thedifferences between the current systematics and resolved molecular phylogeny underline theneed of a systematic revision of the genus.The study of the shell morphology revealed that based on the overall shell morphologyonly three species can be distinguished from the others while there is great plasticity in shellcharacters in the remaining species. The shell size followed a Brownian motion model ofevolution from the deep to the most recent cladogenetic events, while the shape of the aperturedifferentiated mainly during the most recent cladogenetic events. In addition, the variability inshell size is the result of the evolutionary history of the species and in part an adaptation to theclimate (past and present) and to the spatial features of the distributional area. On the otherhand, the observed variability in the aperture’s shape is primarily determined by thephylogenetic relationships at the population level.The seasonal changes in lipids, proteins, glycogen, LDH activity and water content were studied in Codringtonia species, and in some cases it was revealed that the pattern ofseasonal fluctuation, was different between species. The inter-specific differences areinterpreted, at least partly, by the differences of the climatic conditions of the study areas.Finally, it seems that the species that are distributed southern or at lower altitudes constantlyexpress higher levels of Hsp70 compared to species distributed northern or at higher altitudes.The fact that these relationships…

Subjects/Keywords: Βιογεωγραφία; Μορφολογία κελύφους; Μοριακή φυλογένεση; Κλίμα; Πρωτείνες θερμικού σοκ; Biogeography; Climate; Molecular phylogeny; Heat shock proteins; Shell morphology

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kotsakiozi, P. (2013). Συγκριτική μελέτη φυσιολογικών προσαρμογών στα χερσαία σαλιγκάρια του γένους Codringtonia Kobelt 1898. (Thesis). National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ). Retrieved from http://hdl.handle.net/10442/hedi/44287

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kotsakiozi, Panayiota. “Συγκριτική μελέτη φυσιολογικών προσαρμογών στα χερσαία σαλιγκάρια του γένους Codringtonia Kobelt 1898.” 2013. Thesis, National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ). Accessed February 28, 2021. http://hdl.handle.net/10442/hedi/44287.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kotsakiozi, Panayiota. “Συγκριτική μελέτη φυσιολογικών προσαρμογών στα χερσαία σαλιγκάρια του γένους Codringtonia Kobelt 1898.” 2013. Web. 28 Feb 2021.

Vancouver:

Kotsakiozi P. Συγκριτική μελέτη φυσιολογικών προσαρμογών στα χερσαία σαλιγκάρια του γένους Codringtonia Kobelt 1898. [Internet] [Thesis]. National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ); 2013. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/10442/hedi/44287.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kotsakiozi P. Συγκριτική μελέτη φυσιολογικών προσαρμογών στα χερσαία σαλιγκάρια του γένους Codringtonia Kobelt 1898. [Thesis]. National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ); 2013. Available from: http://hdl.handle.net/10442/hedi/44287

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Estado do Rio de Janeiro

12. Washington Jose Fernandes Formiga. Preparação e caracterização de microesferas poliméricas com morfologia casca-núcleo e propriedades magnéticas à base de estireno e divinilbenzeno.

Degree: Master, 2012, Universidade do Estado do Rio de Janeiro

URL: http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=3571 ;

►

Foram sintetizadas microesferas poliméricas com propriedades magnéticas e morfologia casca-núcleo por meio da técnica de polimerização em suspensão em duas etapas. O núcleo foi constituído… (more)

▼

Foram sintetizadas microesferas poliméricas com propriedades magnéticas e morfologia casca-núcleo por meio da técnica de polimerização em suspensão em duas etapas. O núcleo foi constituído por poli(estireno-co-divinilbenzeno) e magnetita modificada com ácido oleico. Foi avaliada a influência da velocidade de agitação e da concentração de iniciador sobre as características das microesferas utilizadas como núcleo (morfologia, tamanho de partículas, propriedades magnéticas e estabilidade térmica). A casca foi constituída por poli(estireno-co-divinilbenzeno) sem material magnético. Foi avaliado o método de adição da emulsão dos monômeros formadores da casca e o tempo de inchamento dos núcleos na emulsão. As microesferas casca-núcleo foram caracterizadas quanto ao seu aspecto morfológico e à estabilidade térmica. Os núcleos não apresentaram ciclos de histerese, estando assim próximos de um material com propriedades superparamagnéticas. O copolímero sintetizado com a maior velocidade de agitação e a menor concentração de iniciador foi o que apresentou o maior teor de ferro incorporado (3,317 %), a maior magnetização de saturação (2,99 emu/g) e o menor diâmetro médio de partículas (81 m). As microesferas casca-núcleo apresentaram apenas um estágio de degradação e as suas Tmáx foram menores do que a do núcleo. O mapa composicional de ferro confirmou a presença de magnetita na superfície das microesferas casca-núcleo

Polymeric microspheres with magnetic properties and core-shell morphology were synthesized by the technique of suspension polymerization in two stages. The core was constituted by poly(styrene-co-divinylbenzene) and magnetite coated with oleic acid. The influence of stirring rate and initiator concentration on microspheres characteristics (morphology, particle size, magnetic properties and thermal stability) was studied. The shell was constituted by poly(styrene-co-divinylbenzene) without magnetic material. It was also evaluated the methods of the monomers emulsion addition and the coress swelling time in the emulsion.. The microspheres were characterized by morphologic aspect and thermal stability. The cores did not presented hysteresis cycles, thus proving the superparamagnetic properties. Copolymer synthesized with the higher stirring rate and lower initiator concentration presented the higher incorporated iron content (3.317 %), higher saturation magnetization (2.99 emu/g) and the lower average particle diameter (81 m). Core-shell microspheres presented only one stage of degradation and the Tmáx were smaller than temperature of the cores. Iron compositional map confirmed the presence of magnetite on the surface of core-shell microspheres

Advisors/Committee Members: Ivana Lourenço de Mello, Alcino Palermo de Aguiar, Marcia Angélica Fernandes e Silva Neves, Marcos Antonio da Silva Costa.

Subjects/Keywords: Microesferas de poli(estireno-co-divinilbenzeno); morfologia casca-núcleo; magnetita; propriedades magnéticas; Poly(styrene-co-divinylbenzene) microspheres; core-shell morphology; magnetite; magnetic properties; POLIMEROS E COLOIDES

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Formiga, W. J. F. (2012). Preparação e caracterização de microesferas poliméricas com morfologia casca-núcleo e propriedades magnéticas à base de estireno e divinilbenzeno. (Masters Thesis). Universidade do Estado do Rio de Janeiro. Retrieved from http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=3571 ;

Chicago Manual of Style (16^th Edition):

Formiga, Washington Jose Fernandes. “Preparação e caracterização de microesferas poliméricas com morfologia casca-núcleo e propriedades magnéticas à base de estireno e divinilbenzeno.” 2012. Masters Thesis, Universidade do Estado do Rio de Janeiro. Accessed February 28, 2021. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=3571 ;.

MLA Handbook (7^th Edition):

Formiga, Washington Jose Fernandes. “Preparação e caracterização de microesferas poliméricas com morfologia casca-núcleo e propriedades magnéticas à base de estireno e divinilbenzeno.” 2012. Web. 28 Feb 2021.

Vancouver:

Formiga WJF. Preparação e caracterização de microesferas poliméricas com morfologia casca-núcleo e propriedades magnéticas à base de estireno e divinilbenzeno. [Internet] [Masters thesis]. Universidade do Estado do Rio de Janeiro; 2012. [cited 2021 Feb 28]. Available from: http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=3571 ;.

Council of Science Editors:

Formiga WJF. Preparação e caracterização de microesferas poliméricas com morfologia casca-núcleo e propriedades magnéticas à base de estireno e divinilbenzeno. [Masters Thesis]. Universidade do Estado do Rio de Janeiro; 2012. Available from: http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=3571 ;

University of the Western Cape

13. Cummings, Franscious Riccardo. TiO2 nanotube based dye- sensitised solar cells .

Degree: 2012, University of the Western Cape

URL: http://hdl.handle.net/11394/3311

► This work investigated the synthesis of Al2O3-coated TiO2 nanotubes via the anodisation technique for application in DSCs. TiO2 nanotube arrays with an average length of… (more)

▼ This work investigated the synthesis of Al2O3-coated TiO2 nanotubes via the anodisation technique for application in DSCs. TiO2 nanotube arrays with an average length of 15 μm, diameter of 50 nm and wall thickness of 15 nm were synthesised via anodisation using an organic neutral electrolyte consisting of 2 M H2O + 0.15 M NH4F + ethylene glycol (EG) at an applied voltage of 60 V for 6 hours. In addition, scanning electron microscope (SEM) micrographs showed that anodisation at these conditions yields nanotubes with smooth walls and hexagonally shaped, closed bottoms. X-ray diffraction (XRD) patterns revealed that the as-anodised nanotubes were amorphous and as such were annealed at 450 °C for 2 hours in air at atmospheric pressure, which yielded crystalline anatase TiO2 nanotubes. Highresolution transmission electron microscope (TEM) images revealed that the nanotube walls comprised of individual nano-sized TiO2 crystallites. Photoluminescence (PL) spectroscopy showed that the optical properties, especially the bandgap of the TiO2 nanotubes are dependent on the crystallinity, which in turn was dependent on the structural characteristics, such as the wall thickness, diameter and length. The PL measurements were supplemented by Raman spectra, which revealed an increased in the quantum confinement of the optical phonon modes of the nanotubes synthesised at low anodisation voltages, consequently yielding a larger bandgap The annealed nanotubes were then coated with a thin layer of alumina (Al2O3) using a simple sol-gel dip coating method, effectively used to coat films of nanoparticles. Atomic force microscopy (AFM) showed that the average nanotube diameter increased post sol-gel deposition, which suggests that the nanotubes are coated with a layer of Al2O3. This was confirmed with HR-TEM, in conjunction with selected area electron diffraction (SAED) and XRD analyses, which showed the coating of the nanotube walls with a thin layer of amorphous Al2O3 with a thickness between 4 and 7 nm. Ultraviolet-visible (UVvis) absorbance spectra showed that the dye-adsorption ability of the nanotubes are enhanced by the Al2O3 coating and hence is a viable material for solar cell application. Upon application in the DSC, it was found by means of photo-current density – voltage (I – V) measurements that a DSC fabricated with a 15 μm thick layer of bare TiO2 nanotubes has a photon-to-light conversion efficiency of 4.56%, which increased to 4.88% after coating the nanotubes with a layer of alumina. However, these devices had poorer conversion efficiencies than bare and Al2O3-coated TiO2 nanoparticle based DSCs, which boasted with efficiencies of 6.54 and 7.26%, respectively. The low efficiencies of the TiO2 nanotube based DSCs are ascribed to the low surface area of the layer of nanotubes, which yielded low photocurrent densities. Electrochemical impedance spectroscopy (EIS) showed that the electron lifetime in the alumina coated nanotubes are almost 20 times greater than in a bare layer of nanoparticles. In addition, it was… Advisors/Committee Members: Knoesen, D (advisor).

Subjects/Keywords: Dye-sensitised solar cells; TiO2 nanotube; Photovoltaics; Electrochemical anodisation; Sol-Gel deposition; Renewable energy; Core-shell nanostructures; Materials science; Opto-electronic properties; Morphology; Electron charge transfer; Crystallinity

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cummings, F. R. (2012). TiO2 nanotube based dye- sensitised solar cells . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/3311

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cummings, Franscious Riccardo. “TiO2 nanotube based dye- sensitised solar cells .” 2012. Thesis, University of the Western Cape. Accessed February 28, 2021. http://hdl.handle.net/11394/3311.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cummings, Franscious Riccardo. “TiO2 nanotube based dye- sensitised solar cells .” 2012. Web. 28 Feb 2021.

Vancouver:

Cummings FR. TiO2 nanotube based dye- sensitised solar cells . [Internet] [Thesis]. University of the Western Cape; 2012. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/11394/3311.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cummings FR. TiO2 nanotube based dye- sensitised solar cells . [Thesis]. University of the Western Cape; 2012. Available from: http://hdl.handle.net/11394/3311

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Georgia Tech

14. Guo, Huina. Structure, processing, and properties of polyacrylpnitrile/carbon nanotube composite films.

Degree: PhD, Textile and Fiber Engineering, 2007, Georgia Tech

URL: http://hdl.handle.net/1853/22555

► Vapor grown carbon nanofibers (VGCNFs) developed in 1980s are being widely used for reinforcing composites. Carbon nanotubes (CNTs) discovered in early 1990 can be classified… (more)

▼ Vapor grown carbon nanofibers (VGCNFs) developed in 1980s are being widely used for reinforcing composites. Carbon nanotubes (CNTs) discovered in early 1990 can be classified as single wall carbon nanotubes (SWNTs), double wall carbon nanotube (DWNTs) and multi wall carbon nanotubes (MWNTs) depending on the number of grapheme layer forming the carbon nanotube. Polyacrylonitrile (PAN), a commercially important polymer is a predominant precursor for carbon fiber. Carbonized and activated PAN/SWNT films can find application as electrochemical supercapacitor electrodes. This study is focused on the structure, processing and properties of polyacrylonitrile/carbon nanotube (CNT) composite films. PAN/SWNT (60/40) composite film have been processed with unique combination of tensile strength, modulus, electrical conductivity, dimensional stability, low density, solvent resistance, and thermal stability. PAN molecular motion above the glass transition temperature (Tg) in the composite film is significantly suppressed, resulting in high PAN/SWNT storage modulus above Tg. The specific modulus of PAN/VGCNF composite films is consistent with the predictions of the Halpin-Tsai equation up to 20% VGCNF loading. The magnitude of modulus and other property enhancement is reduced as the nanofiber loading is increased (up to 40%). Further increase in nanofiber loading (> 40%) in composite results in modulus and tensile strength lower than those of control PAN. Electrical percolation was observed at 3.1 vol% VGCNF loading. PAN/CNT composite films were processed using SWNTs, DWNTs, MWNTs and VGCNFs to study the effect of various nanotubes on the composite properties. PAN/CNT films have been characterized by wide angle X-ray diffraction (WAXD), Raman spectroscopy, and scanning as well as transmission electron microscopy. Films have also been characterized for electrical conductivity, tensile and dynamic mechanical properties. Mechanical property results have been analyzed in terms of the nanotube surface area determined by nitrogen gas adsorption. PAN/CNT composite films and fibers are characterized using solid state 1HNMR spin lattice relaxation time (T1). With the addition of nanotubes, the T1 values for the PAN matrix generally decreased, and the reduction mechanism is discussed. The optical anisotropy of SWNT in PAN/SWNT composites was observed in their polarized infrared spectra and analyzed using the effective medium theory. Advisors/Committee Members: Satish Kumar (Committee Chair), Art Ragauskas (Committee Member), Johannes Leisen (Committee Member), John Muzzy (Committee Member), Samuel Graham (Committee Member).

Subjects/Keywords: Core-shell structure; Intercalation; Interaction; Morphology; Nanotubes; Polymeric composites; Thin films

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Guo, H. (2007). Structure, processing, and properties of polyacrylpnitrile/carbon nanotube composite films. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/22555

Chicago Manual of Style (16^th Edition):

Guo, Huina. “Structure, processing, and properties of polyacrylpnitrile/carbon nanotube composite films.” 2007. Doctoral Dissertation, Georgia Tech. Accessed February 28, 2021. http://hdl.handle.net/1853/22555.

MLA Handbook (7^th Edition):

Guo, Huina. “Structure, processing, and properties of polyacrylpnitrile/carbon nanotube composite films.” 2007. Web. 28 Feb 2021.

Vancouver:

Guo H. Structure, processing, and properties of polyacrylpnitrile/carbon nanotube composite films. [Internet] [Doctoral dissertation]. Georgia Tech; 2007. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/1853/22555.

Council of Science Editors:

Guo H. Structure, processing, and properties of polyacrylpnitrile/carbon nanotube composite films. [Doctoral Dissertation]. Georgia Tech; 2007. Available from: http://hdl.handle.net/1853/22555

15. Mathews, Martin. ADVANCING Li/CFx BATTERY CHEMISTRY: A STUDY ON PARTIALLY REDUCED CFx AS A PRIMARY Li/CFx CELL CATHODE MATERIAL.

Degree: MS, Chemistry, 2011, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10272011-170834/ ;

► Conventional primary Li/CFx batteries employ graphite and polyvinylidene fluoride additives in the cathodes. These additives usher in some un-desired side-effects, such as lower battery… (more)

Subjects/Keywords: primary lithium/CFx battery; cathode material; electrochemical impedance spectroscopy; solvated electron reduction; core-shell morphology

…is expected to have a thin outer layer core-shell morphology: the reduced top layer carbon… …CFx To investigate the core-shell morphology of reduced CFx (RCF) and the… …discharge reaction begins, carbon forms as an electrically conductive graphene shell on the CFx… …particles. This conductive shell enhances the overall conductivity of the cathode assembly. Thus… …atoms will form a conductive graphitic shell while the CFx core remains intact inside each…

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mathews, M. (2011). ADVANCING Li/CFx BATTERY CHEMISTRY: A STUDY ON PARTIALLY REDUCED CFx AS A PRIMARY Li/CFx CELL CATHODE MATERIAL. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10272011-170834/ ;

Chicago Manual of Style (16^th Edition):

Mathews, Martin. “ADVANCING Li/CFx BATTERY CHEMISTRY: A STUDY ON PARTIALLY REDUCED CFx AS A PRIMARY Li/CFx CELL CATHODE MATERIAL.” 2011. Masters Thesis, Mississippi State University. Accessed February 28, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10272011-170834/ ;.

MLA Handbook (7^th Edition):

Mathews, Martin. “ADVANCING Li/CFx BATTERY CHEMISTRY: A STUDY ON PARTIALLY REDUCED CFx AS A PRIMARY Li/CFx CELL CATHODE MATERIAL.” 2011. Web. 28 Feb 2021.

Vancouver:

Mathews M. ADVANCING Li/CFx BATTERY CHEMISTRY: A STUDY ON PARTIALLY REDUCED CFx AS A PRIMARY Li/CFx CELL CATHODE MATERIAL. [Internet] [Masters thesis]. Mississippi State University; 2011. [cited 2021 Feb 28]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10272011-170834/ ;.

Council of Science Editors:

Mathews M. ADVANCING Li/CFx BATTERY CHEMISTRY: A STUDY ON PARTIALLY REDUCED CFx AS A PRIMARY Li/CFx CELL CATHODE MATERIAL. [Masters Thesis]. Mississippi State University; 2011. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10272011-170834/ ;

University of Lund

16. Lakowitz, Thomas. Predator induced phenotypic plasticity in a freshwater snail.

Degree: 2008, University of Lund

URL: https://lup.lub.lu.se/record/1243709 ; https://portal.research.lu.se/ws/files/6357873/1264714.pdf

► In this thesis I examined a phenotypically plastic defence in a common freshwater snail, Radix balthica. Adaptive prey defences may involve behavioural, life-history or morphological… (more)

▼ In this thesis I examined a phenotypically plastic defence in a common freshwater snail, Radix balthica. Adaptive prey defences may involve behavioural, life-history or morphological changes. Snails are important species in freshwater systems. Their role as grazers on periphytic algae makes them particularly important as they have a positive impact on macrophyte growth in lakes and ponds. The structuring role of predators, especially fish, on snails may therefore have a great impact on lake ecosystems. I have studied the occurrence of different shell shapes in this snail in nature. In laboratory studies, I have determined the degree of shell plasticity over many populations, the morphological reaction to multiple predators, costs of expressing plastic traits and the role of plasticity in a community context with other snails. My results show this snail to have different shell shapes in nature that can be attributed to the presence or absence of molluscivorous fish. In the laboratory, I established it to be a phenotypically plastic species with identical reaction norms irrespective if the population originated from a fish or fish free pond. In a test with multiple predators, fish and crayfish that differs in foraging strategies, I showed that this species produces different shell shapes, but that the main defensive change was directed to defend against fish predation and that shape determined the crushing resistance of the shell. I also showed it to be able to compensate differences in shell shape with shell thickness to maintain crushing forces of the shell that are an important factor for defence against fish. The costs for adaptive trait changes like morphology, shell thickness or behaviour seems to be relatively low in this species. Instead, costs mainly emerge from reduced growth rates and lower fecundity. In the competition with other snail species, R. balthica is a strong competitor that dominates the system with or without the presence of predator cues only. Under direct predation from fish, it depends on the higher crush resistance of a morphologically altered shell shape and persists together with another hard shelled species in this environment. The main conclusions from my thesis is that this species is plastic over a large geographical range, probably through high gene flow and that fish has been a key predator in the evolution of a plastic defence. It shows great versatility in many traits in the presence of fish and at relatively low costs. It is a strong competitor and due to the morphologically plastic shell, persistent in many environments.

Subjects/Keywords: Environmental Sciences; Ecology; dispersal; Radix balthica; shell morphology; reaction norm; multiple predators; cost of plasticity; intraspecific competition; inerspecific competition

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lakowitz, T. (2008). Predator induced phenotypic plasticity in a freshwater snail. (Doctoral Dissertation). University of Lund. Retrieved from https://lup.lub.lu.se/record/1243709 ; https://portal.research.lu.se/ws/files/6357873/1264714.pdf

Chicago Manual of Style (16^th Edition):

Lakowitz, Thomas. “Predator induced phenotypic plasticity in a freshwater snail.” 2008. Doctoral Dissertation, University of Lund. Accessed February 28, 2021. https://lup.lub.lu.se/record/1243709 ; https://portal.research.lu.se/ws/files/6357873/1264714.pdf.

MLA Handbook (7^th Edition):

Lakowitz, Thomas. “Predator induced phenotypic plasticity in a freshwater snail.” 2008. Web. 28 Feb 2021.

Vancouver:

Lakowitz T. Predator induced phenotypic plasticity in a freshwater snail. [Internet] [Doctoral dissertation]. University of Lund; 2008. [cited 2021 Feb 28]. Available from: https://lup.lub.lu.se/record/1243709 ; https://portal.research.lu.se/ws/files/6357873/1264714.pdf.

Council of Science Editors:

Lakowitz T. Predator induced phenotypic plasticity in a freshwater snail. [Doctoral Dissertation]. University of Lund; 2008. Available from: https://lup.lub.lu.se/record/1243709 ; https://portal.research.lu.se/ws/files/6357873/1264714.pdf

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations