subject:(nitrogen)

University of Georgia

1. Bower, Katherine Elizabeth. Relationship between transpiration and nitrogen uptake by pepper (Capsicum annuum) as mediated by vapor pressure deficit.

Degree: MS, Forest Resources, 2008, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/bower_katherine_e_200812_ms

► As a consequence of photosynthesis, plants lose water rapidly via transpiration. However, transpiration may benefit the plant by facilitating nutrient uptake and transport through the… (more)

Subjects/Keywords: nitrogen

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APA (6^th Edition):

Bower, K. E. (2008). Relationship between transpiration and nitrogen uptake by pepper (Capsicum annuum) as mediated by vapor pressure deficit. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/bower_katherine_e_200812_ms

Chicago Manual of Style (16^th Edition):

Bower, Katherine Elizabeth. “Relationship between transpiration and nitrogen uptake by pepper (Capsicum annuum) as mediated by vapor pressure deficit.” 2008. Masters Thesis, University of Georgia. Accessed February 27, 2020. http://purl.galileo.usg.edu/uga_etd/bower_katherine_e_200812_ms.

MLA Handbook (7^th Edition):

Bower, Katherine Elizabeth. “Relationship between transpiration and nitrogen uptake by pepper (Capsicum annuum) as mediated by vapor pressure deficit.” 2008. Web. 27 Feb 2020.

Vancouver:

Bower KE. Relationship between transpiration and nitrogen uptake by pepper (Capsicum annuum) as mediated by vapor pressure deficit. [Internet] [Masters thesis]. University of Georgia; 2008. [cited 2020 Feb 27]. Available from: http://purl.galileo.usg.edu/uga_etd/bower_katherine_e_200812_ms.

Council of Science Editors:

Bower KE. Relationship between transpiration and nitrogen uptake by pepper (Capsicum annuum) as mediated by vapor pressure deficit. [Masters Thesis]. University of Georgia; 2008. Available from: http://purl.galileo.usg.edu/uga_etd/bower_katherine_e_200812_ms

University of Georgia

2. Kaufman, Galen Bernard. Application of the Water Quality Analysis Simulation Program (WASP) to evaluate dissolved nitrogen concentrations in the Altamaha River estuary, Georgia.

Degree: MS, Marine Sciences, 2011, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/kaufman_galen_b_201108_ms

► The Water Quality Analysis Simulation Program (WASP v.7.4) and a water flow model, SqueezeBox, were used to model concentrations of dissolved nitrogen (DN) in the… (more)

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Kaufman, G. B. (2011). Application of the Water Quality Analysis Simulation Program (WASP) to evaluate dissolved nitrogen concentrations in the Altamaha River estuary, Georgia. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/kaufman_galen_b_201108_ms

Chicago Manual of Style (16^th Edition):

Kaufman, Galen Bernard. “Application of the Water Quality Analysis Simulation Program (WASP) to evaluate dissolved nitrogen concentrations in the Altamaha River estuary, Georgia.” 2011. Masters Thesis, University of Georgia. Accessed February 27, 2020. http://purl.galileo.usg.edu/uga_etd/kaufman_galen_b_201108_ms.

MLA Handbook (7^th Edition):

Kaufman, Galen Bernard. “Application of the Water Quality Analysis Simulation Program (WASP) to evaluate dissolved nitrogen concentrations in the Altamaha River estuary, Georgia.” 2011. Web. 27 Feb 2020.

Vancouver:

Kaufman GB. Application of the Water Quality Analysis Simulation Program (WASP) to evaluate dissolved nitrogen concentrations in the Altamaha River estuary, Georgia. [Internet] [Masters thesis]. University of Georgia; 2011. [cited 2020 Feb 27]. Available from: http://purl.galileo.usg.edu/uga_etd/kaufman_galen_b_201108_ms.

Council of Science Editors:

Kaufman GB. Application of the Water Quality Analysis Simulation Program (WASP) to evaluate dissolved nitrogen concentrations in the Altamaha River estuary, Georgia. [Masters Thesis]. University of Georgia; 2011. Available from: http://purl.galileo.usg.edu/uga_etd/kaufman_galen_b_201108_ms

University of Georgia

3. Schroer, Katherine Lynn. Controls on nitrate degradation in two adjacent wetland streams with different geochemistry and flow-source terms, Watkinsville, GA.

Degree: PhD, Geology, 2011, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/schroer_katherine_l_201108_phd

► A two-year sampling program was conducted to elucidate controls on nitrate N removal and retention in two small wetland streams that drain portions of a… (more)

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Schroer, K. L. (2011). Controls on nitrate degradation in two adjacent wetland streams with different geochemistry and flow-source terms, Watkinsville, GA. (Doctoral Dissertation). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/schroer_katherine_l_201108_phd

Chicago Manual of Style (16^th Edition):

Schroer, Katherine Lynn. “Controls on nitrate degradation in two adjacent wetland streams with different geochemistry and flow-source terms, Watkinsville, GA.” 2011. Doctoral Dissertation, University of Georgia. Accessed February 27, 2020. http://purl.galileo.usg.edu/uga_etd/schroer_katherine_l_201108_phd.

MLA Handbook (7^th Edition):

Schroer, Katherine Lynn. “Controls on nitrate degradation in two adjacent wetland streams with different geochemistry and flow-source terms, Watkinsville, GA.” 2011. Web. 27 Feb 2020.

Vancouver:

Schroer KL. Controls on nitrate degradation in two adjacent wetland streams with different geochemistry and flow-source terms, Watkinsville, GA. [Internet] [Doctoral dissertation]. University of Georgia; 2011. [cited 2020 Feb 27]. Available from: http://purl.galileo.usg.edu/uga_etd/schroer_katherine_l_201108_phd.

Council of Science Editors:

Schroer KL. Controls on nitrate degradation in two adjacent wetland streams with different geochemistry and flow-source terms, Watkinsville, GA. [Doctoral Dissertation]. University of Georgia; 2011. Available from: http://purl.galileo.usg.edu/uga_etd/schroer_katherine_l_201108_phd

University of Georgia

4. Schaefer, Sylvia Catherine. Controls on nitrogen inputs, loads, and in-stream concentrations in the Altamaha River, Georgia, and beyond.

Degree: PhD, Marine Sciences, 2014, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/schaefer_sylvia_c_201408_phd

► Human activity has increased the availability of reactive nitrogen (N), an element of critical importance to life. The broad goal of this dissertation was to… (more)

▼ Human activity has increased the availability of reactive nitrogen (N), an element of critical importance to life. The broad goal of this dissertation was to understand which sources of N to a watershed reach rivers. Nitrogen input budgets were calculated for 18 watersheds on the United States west coast. Fertilizer was the most important source of new N, with atmospheric deposition second. N export was best correlated with streamflow variations, which explained 66% of the variance. Including inputs explained an additional 16% of the variance. Riverine N export averaged 12% of inputs. Percentage export was also best related to streamflow. These results were likely due to the large range of streamflows across the study region, which may have overwhelmed other factors contributing to N export. An in-depth examination of the Altamaha River watershed (Georgia, USA) found that riverine N concentrations and cumulative loads were best related to population density, rather than input factors. Concentrations were highest in the upper watershed and lowest in blackwater streams and a sampling station downstream of a dam. Isotopic analysis of nitrate suggested that most in-stream nitrate is derived from sewage or manure. Where the concentration was particularly low, an atmospheric signal was observed, suggesting that background nitrate is of atmospheric origin. N in this system appeared to be lost primarily on the watershed surface, as only a small proportion of inputs reached the stream, N was transported downstream conservatively, and an isotopic mixing model fit the data well. The Altamaha is comparable to other watersheds worldwide in its nitrate concentrations and population density. A metadata analysis of medium-sized (2,000-50,000 km2) watersheds, which are under-studied relative to large watersheds, revealed that nitrate concentrations are generally low (<25 µM). We found a relationship between population density and riverine NO3- concentration, which varied among continents and latitudinal zones. A combination of population density, population density without access to improved sanitation, temperature, precipitation, slope, and fertilizer use, explained 45% of the variation in nitrate concentrations. The relationship had less explanatory power than in large watersheds, potentially due to increased variation in NO3- concentrations with decreased watershed size. Advisors/Committee Members: Merryl Alber.

Subjects/Keywords: nitrogen

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APA (6^th Edition):

Schaefer, S. C. (2014). Controls on nitrogen inputs, loads, and in-stream concentrations in the Altamaha River, Georgia, and beyond. (Doctoral Dissertation). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/schaefer_sylvia_c_201408_phd

Chicago Manual of Style (16^th Edition):

Schaefer, Sylvia Catherine. “Controls on nitrogen inputs, loads, and in-stream concentrations in the Altamaha River, Georgia, and beyond.” 2014. Doctoral Dissertation, University of Georgia. Accessed February 27, 2020. http://purl.galileo.usg.edu/uga_etd/schaefer_sylvia_c_201408_phd.

MLA Handbook (7^th Edition):

Schaefer, Sylvia Catherine. “Controls on nitrogen inputs, loads, and in-stream concentrations in the Altamaha River, Georgia, and beyond.” 2014. Web. 27 Feb 2020.

Vancouver:

Schaefer SC. Controls on nitrogen inputs, loads, and in-stream concentrations in the Altamaha River, Georgia, and beyond. [Internet] [Doctoral dissertation]. University of Georgia; 2014. [cited 2020 Feb 27]. Available from: http://purl.galileo.usg.edu/uga_etd/schaefer_sylvia_c_201408_phd.

Council of Science Editors:

Schaefer SC. Controls on nitrogen inputs, loads, and in-stream concentrations in the Altamaha River, Georgia, and beyond. [Doctoral Dissertation]. University of Georgia; 2014. Available from: http://purl.galileo.usg.edu/uga_etd/schaefer_sylvia_c_201408_phd

University of Georgia

5. Chen, Yigen. Tritrophic effects of nitrogen on cotton ecosystem.

Degree: PhD, Entomology, 2007, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/chen_yigen_200712_phd

► Nitrogen (N) fertilization is one of the most common agronomic practices in crop production, and can have profound impacts on tritrophic interactions, affecting both bottom-up… (more)

▼ Nitrogen (N) fertilization is one of the most common agronomic practices in crop production, and can have profound impacts on tritrophic interactions, affecting both bottom-up and top-down forces in pest management, and consequently on community structures of ecosystems. In the study the effects of N fertilization (42, 112, 196, and 280 ppm N) on tritrophic inteactions among cotton plants, Gossypium hirsutum L., beet armyworm, Spodoptera exigua (Hübner), and the parasitoid, Cotesia marginiventris (Cresson), were investigated in the laboratory, greenhouse and field. N addition increased plant biomass and plant nutritional quality as indicated by total N content of leaf blade and petiole nitrate-N. N enhancement decreased the major non-volatile plant defensive compounds (hemigossypolone and heliocides 1-4) of cotton leaf tissue. Spodoptera exigua larvae developed faster on plants receiving high N fertilization and significantly fewer S. exigua larvae underwent a sixth larval instar than those reared on low N plants. In dual-choice tests, both S. exigua larvae and adult females preferentially chose cotton plants with high N fertilization for feeding and oviposition, respectively. Increased nutritional quality and weaker defense of cotton plants receiving high N fertilization might both contribute to faster development and feeding preference of S. exigua larvae, and oviposition preference of S. exigua adult females on high N plants compared to low N plants. N fertilization of host plants subsequently fastened the development of C. marginiventris, possibly due to more balanced protein:carbohydrate (P:C) ratios, or less defensive compounds in the hemolymph of the hosts. N enhancement ameliorated the production of plant hormones (jasmonic acids and salicylic acids) and most of the herbivore-induced volatile plant secondary metabolites, except for the major two green leaf volatiles (Z-2-hexenal and Z-3-hexenal), the releasing of which was increased. The parasitisms of early instar S. exiuga larvae by C. marginiventris were not significantly affected by N treatments. The slowed growth of S. exiuga larvae feeding on low N plants did not translated into higher mortality inflicted by C. marginiventris mainly due to a shift of timing of susceptibility. N fertilization in the field increased plant growth, and some populations of pests and predators. N fertilization had variable effects on cotton lint yield. Advisors/Committee Members: John Ruberson.

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Chen, Y. (2007). Tritrophic effects of nitrogen on cotton ecosystem. (Doctoral Dissertation). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/chen_yigen_200712_phd

Chicago Manual of Style (16^th Edition):

Chen, Yigen. “Tritrophic effects of nitrogen on cotton ecosystem.” 2007. Doctoral Dissertation, University of Georgia. Accessed February 27, 2020. http://purl.galileo.usg.edu/uga_etd/chen_yigen_200712_phd.

MLA Handbook (7^th Edition):

Chen, Yigen. “Tritrophic effects of nitrogen on cotton ecosystem.” 2007. Web. 27 Feb 2020.

Vancouver:

Chen Y. Tritrophic effects of nitrogen on cotton ecosystem. [Internet] [Doctoral dissertation]. University of Georgia; 2007. [cited 2020 Feb 27]. Available from: http://purl.galileo.usg.edu/uga_etd/chen_yigen_200712_phd.

Council of Science Editors:

Chen Y. Tritrophic effects of nitrogen on cotton ecosystem. [Doctoral Dissertation]. University of Georgia; 2007. Available from: http://purl.galileo.usg.edu/uga_etd/chen_yigen_200712_phd

6. Almaraz, Maya. Nitrogen Availability and Loss from Unmanaged and Managed Ecosystems.

Degree: Ecological and Evolutionary Biology, 2017, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:730645/

► Anthropogenic changes to the global nitrogen (N) cycle have resulted in both positive and negative consequences to environmental and human health. Where N is scarce,… (more)

Subjects/Keywords: nitrogen

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APA (6^th Edition):

Almaraz, M. (2017). Nitrogen Availability and Loss from Unmanaged and Managed Ecosystems. (Thesis). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:730645/

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):

Almaraz, Maya. “Nitrogen Availability and Loss from Unmanaged and Managed Ecosystems.” 2017. Thesis, Brown University. Accessed February 27, 2020. https://repository.library.brown.edu/studio/item/bdr:730645/.

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

MLA Handbook (7^th Edition):

Almaraz, Maya. “Nitrogen Availability and Loss from Unmanaged and Managed Ecosystems.” 2017. Web. 27 Feb 2020.

Vancouver:

Almaraz M. Nitrogen Availability and Loss from Unmanaged and Managed Ecosystems. [Internet] [Thesis]. Brown University; 2017. [cited 2020 Feb 27]. Available from: https://repository.library.brown.edu/studio/item/bdr:730645/.

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

Council of Science Editors:

Almaraz M. Nitrogen Availability and Loss from Unmanaged and Managed Ecosystems. [Thesis]. Brown University; 2017. Available from: https://repository.library.brown.edu/studio/item/bdr:730645/

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

Université de Neuchâtel

7. Simon, Anaële. Highways and subways: a story of fungi and bacteria in soils.

Degree: 2016, Université de Neuchâtel

URL: http://doc.rero.ch/record/278339

► Traditionnellement, bactériologues et mycologues mènent leurs recherches séparément, et ce malgré le fait que bactéries et champignons coexistent dans pratiquement tous les écosystèmes. Parmi les… (more)

▼ Traditionnellement, bactériologues et mycologues mènent leurs recherches séparément, et ce malgré le fait que bactéries et champignons coexistent dans pratiquement tous les écosystèmes. Parmi les nombreuses interactions qui peuvent avoir lieu entre champignons et bactéries, cette thèse étudie les autoroutes fongiques, une interaction dans laquelle les bactéries sont capables de se déplacer le long d’hyphes de champignons. Nous avons investigué différents sols, avec une attention particulière portée à la voie oxalate-carbonate. Dans cette voie métabolique, il semblerait que la dispersion de bactéries le long d’hyphes fongiques soit importante pour l’activité oxalotrophe des bactéries. Nous avons développé un nouvel outil, appelé <i>colonne pour autoroutes fongiques</i>, destiné à isoler spécifiquement des champignons et des bactéries capables de se déplacer le long d’hyphes fongiques. Une approche à la fois cultivable et moléculaire nous a permis d’avoir un aperçu de la diversité des champignons et des bactéries interagissant par autoroutes fongiques dans les sols. Nos résultats suggèrent que la migration de bactéries le long des hyphes peut être soit extra-hyphale (autoroutes fongiques), soit intra-hyphale (métros fongiques). Nous avons observé que le déplacement de bactéries le long des hyphes fongiques est dépendant du milieu de culture, mais nous n’avons pas pu trouver l’élément régissant ce comportement différentiel. Nos résultats montrent que les autoroutes - et métros - fongiques doivent être considérés comme cruciaux pour la colonisation de nouveaux environnements par les bactéries. De plus, ces interactions jouent un rôle important dans la structuration des communautés bactériennes dans les sols. Nous avons également démontré que des champignons présents dans la voie oxalate-carbonate sont capables de dissoudre l’oxalate de calcium, ainsi que de disperser des bactéries non-oxalotrophes, redéfinissant ainsi le rôle de chaque organisme dans la voie oxalate-carbonate. Finalement, nous avons observé une propriété surprenante de certains champignons, que l’on pourrait relier a de la fixation d’azote, mais nous n’avons pu ni prouver, ni démentir, cette capacité. Cette thèse permet d’entrevoir la complexité des interactions champignons-bactéries, et démontre qu’il est important de considérer les deux groupes d’organismes lors d’études de leur écologie dans les sols. Advisors/Committee Members: Pilar (Dir.), Eric P. (Codir.).

Subjects/Keywords: nitrogen

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APA (6^th Edition):

Simon, A. (2016). Highways and subways: a story of fungi and bacteria in soils. (Thesis). Université de Neuchâtel. Retrieved from http://doc.rero.ch/record/278339

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):

Simon, Anaële. “Highways and subways: a story of fungi and bacteria in soils.” 2016. Thesis, Université de Neuchâtel. Accessed February 27, 2020. http://doc.rero.ch/record/278339.

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

MLA Handbook (7^th Edition):

Simon, Anaële. “Highways and subways: a story of fungi and bacteria in soils.” 2016. Web. 27 Feb 2020.

Vancouver:

Simon A. Highways and subways: a story of fungi and bacteria in soils. [Internet] [Thesis]. Université de Neuchâtel; 2016. [cited 2020 Feb 27]. Available from: http://doc.rero.ch/record/278339.

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

Council of Science Editors:

Simon A. Highways and subways: a story of fungi and bacteria in soils. [Thesis]. Université de Neuchâtel; 2016. Available from: http://doc.rero.ch/record/278339

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

Oregon State University

8. Zarnetske, Jay P. Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface.

Degree: PhD, Water Resources Science, 2011, Oregon State University

URL: http://hdl.handle.net/1957/23463

► The feedbacks between hydrology and biogeochemical cycling of nitrogen (N) are of critical importance to global bioavailable N budgets. Human activities are dramatically increasing the… (more)

▼ The feedbacks between hydrology and biogeochemical cycling of nitrogen (N) are of critical importance to global bioavailable N budgets. Human activities are dramatically increasing the amount of bioavailable N in the biosphere, which is causing increasingly frequent and severe impacts on ecosystems and human welfare. Streams are important features in the landscape for N cycling, because they integrate many sources of terrestrially derived N and control export to downgradient systems via internal source and sink processes. N transformations in stream ecosystems are typically very complex due to spatiotemporal variability in the factors controlling N biogeochemistry. Thus, it is difficult to predict if a particular stream system will function as a net source or sink of bioavailable N. A key location for N transformations in stream ecosystems is the hyporheic zone, where stream and ground waters mix. The hyporheic zone can be a source of bioavailable N via nitrification or a sink via denitrification. These N transformations are regulated by the physical and biogeochemical conditions of hyporheic zones. Natural heterogeneity in streams leads to unique combinations of both the physical and biogeochemical conditions which in turn result in unique N source and sink conditions. This dissertation investigates the relationships between physical and biogeochemical controls and the resulting fate of bioavailable N in hyporheic zones. The key physical factor investigated is the supply rate of solutes which is a function of transport processes - advection and dispersion, and transport conditions - hydraulic conductivity and flowpath length. Different physical conditions result in different characteristic residence times of water and solutes in hyporheic zones. The key biogeochemical factors investigated are the dynamics of oxygen (O₂), labile dissolved organic carbon (DOC), and inorganic bioavailable N (NH₄⁺ and NO₃⁻). This dissertation uses ¹⁵N isotope experiments, numerical modeling of coupled transport of the bioavailable N species, O₂ and DOC, and a suite of geophysical measurements to identify the key linkages between hydrological and biogeochemical controls on N transformations in hyporheic zones. Specifically, it was determined that the conditions governing the fate of hyporheic N are both the physical transport and reaction kinetics – the residence time of water and the O2 uptake rate. An important scaling relationship is developed by relating the characteristic timescales of residence time and O₂ uptake. The resulting dimensionless relationship, the Damköhler number for O₂, is useful for scaling different streams hyporheic zones and their role on stream N source – sink dynamics. More generally, these investigations demonstrate that careful consideration and quantification of hydrological processes can greatly inform the investigation of aquatic biogeochemical dynamics and lead to the development of process-based knowledge. In turn, this process-based knowledge will facilitate more robust approaches… Advisors/Committee Members: Haggerty, Roy (advisor), Wondzell, Steven (committee member).

Subjects/Keywords: Nitrogen Cycling; Nitrogen cycle

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APA (6^th Edition):

Zarnetske, J. P. (2011). Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/23463

Chicago Manual of Style (16^th Edition):

Zarnetske, Jay P. “Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface.” 2011. Doctoral Dissertation, Oregon State University. Accessed February 27, 2020. http://hdl.handle.net/1957/23463.

MLA Handbook (7^th Edition):

Zarnetske, Jay P. “Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface.” 2011. Web. 27 Feb 2020.

Vancouver:

Zarnetske JP. Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface. [Internet] [Doctoral dissertation]. Oregon State University; 2011. [cited 2020 Feb 27]. Available from: http://hdl.handle.net/1957/23463.

Council of Science Editors:

Zarnetske JP. Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface. [Doctoral Dissertation]. Oregon State University; 2011. Available from: http://hdl.handle.net/1957/23463

Oregon State University

9. Somes, Christopher J. Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation.

Degree: MS, Oceanography, 2010, Oregon State University

URL: http://hdl.handle.net/1957/13836

► We present a new nitrogen isotope model incorporated into the three-dimensional ocean component of a global Earth System Climate Model designed for millennial timescale simulations.… (more)

▼ We present a new nitrogen isotope model incorporated into the three-dimensional ocean component of a global Earth System Climate Model designed for millennial timescale simulations. The model includes prognostic tracers for the stable nitrogen isotopes, ¹⁴N and ¹⁵N, in the nitrate (NO₃ˉ), phytoplankton, zooplankton, and detritus variables of the marine ecosystem model. The isotope effects of algal NO₃ˉ assimilation, water column denitrification, and zooplankton excretion are considered as well as the input of newly fixed nitrogen by diazotrophs. A global database of δ¹⁵NO₃ˉ observations is compiled from previous studies and compared to the model results on a regional basis where sufficient observations exist. The model is able to qualitatively and quantitatively reproduce the observed patterns such as high subsurface values in denitrification zones, the meridional and vertical gradients in the Southern Ocean, and the meridional gradient in the Central Equatorial Pacific. The observed subsurface minimum in the Atlantic is underestimated presumably owing to too little nitrogen fixation there. Sensitivity experiments show that algal NO₃ˉ assimilation, nitrogen fixation and water column denitrification have strong effects on the simulated distribution of nitrogen isotopes, whereas the effect from zooplankton excretion is weaker. Both water column and sedimentary denitrification also have important indirect effects on the nitrogen isotopes distribution by reducing the fixed nitrogen inventory, which creates an ecological niche for diazotrophs and stimulates additional nitrogen fixation. Water column denitrification has a strong but rather localized effect on the nitrogen isotope distribution in model versions without iron limitation of diazotrophy, in which a tight coupling of nitrogen fixation exists. However, including iron limitation of diazotrophy inhibits a tight coupling between water column denitrification and nitrogen fixation in the Eastern Pacific and shifts the main location of nitrogen fixation from the Eastern Tropical Pacific to the Western Tropical Pacific, which results in a better agreement with N' = NO₃ˉ−16PO₄³ˉ and δ¹⁵NO₃ˉ observations. Thus, our model results suggest that iron limitation of diazotrophy can modulate the feedback between denitrification and nitrogen fixation in the ocean. We speculate that a feedback response time on the centennial to millennial time scale may exist between denitrification and nitrogen fixation, producing imbalances in the global oceanic fixed nitrogen cycle, which may well have contributed to past changes of atmospheric CO₂ via the biological pump. Advisors/Committee Members: Schmittner, Andreas (advisor), Mix, Alan (committee member).

Subjects/Keywords: nitrogen; Nitrogen cycle – Mathematical models

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APA (6^th Edition):

Somes, C. J. (2010). Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/13836

Chicago Manual of Style (16^th Edition):

Somes, Christopher J. “Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation.” 2010. Masters Thesis, Oregon State University. Accessed February 27, 2020. http://hdl.handle.net/1957/13836.

MLA Handbook (7^th Edition):

Somes, Christopher J. “Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation.” 2010. Web. 27 Feb 2020.

Vancouver:

Somes CJ. Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation. [Internet] [Masters thesis]. Oregon State University; 2010. [cited 2020 Feb 27]. Available from: http://hdl.handle.net/1957/13836.

Council of Science Editors:

Somes CJ. Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation. [Masters Thesis]. Oregon State University; 2010. Available from: http://hdl.handle.net/1957/13836

University of the Western Cape

10. Mketsu, Moses Clive Masisange. Screening for subtate tolerant Geobacillus pallidus RAPc8 nitrile hydratase .

Degree: 2009, University of the Western Cape

URL: http://hdl.handle.net/11394/2609

► In this study G. pallidus RAPc8 NHase mutants were screened for reduced substrate inhibition compared to the wild type enzyme. Wild type and mutant enzymes… (more)

Subjects/Keywords: Nitrogen compounds; Nitriles; Nitrogen

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APA (6^th Edition):

Mketsu, M. C. M. (2009). Screening for subtate tolerant Geobacillus pallidus RAPc8 nitrile hydratase . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/2609

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):

Mketsu, Moses Clive Masisange. “Screening for subtate tolerant Geobacillus pallidus RAPc8 nitrile hydratase .” 2009. Thesis, University of the Western Cape. Accessed February 27, 2020. http://hdl.handle.net/11394/2609.

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

MLA Handbook (7^th Edition):

Mketsu, Moses Clive Masisange. “Screening for subtate tolerant Geobacillus pallidus RAPc8 nitrile hydratase .” 2009. Web. 27 Feb 2020.

Vancouver:

Mketsu MCM. Screening for subtate tolerant Geobacillus pallidus RAPc8 nitrile hydratase . [Internet] [Thesis]. University of the Western Cape; 2009. [cited 2020 Feb 27]. Available from: http://hdl.handle.net/11394/2609.

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

Council of Science Editors:

Mketsu MCM. Screening for subtate tolerant Geobacillus pallidus RAPc8 nitrile hydratase . [Thesis]. University of the Western Cape; 2009. Available from: http://hdl.handle.net/11394/2609

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

University of Georgia

11. Bonito, Gregory Michael. Factors regulating nitrogen mineralization along an elevation gradient in the southern appalachian mountains, USA.

Degree: MS, Conservation Ecology and Sustainable Development, 2001, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/bonito_gregory_m_200108_ms

► Reaction rates typically decrease with decreasing temperature. Temperature decreases with increasing elevation. Thus, nitrogen (N) mineralization rates are predicted to decrease with increasing elevation. However,… (more)

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Bonito, G. M. (2001). Factors regulating nitrogen mineralization along an elevation gradient in the southern appalachian mountains, USA. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/bonito_gregory_m_200108_ms

Chicago Manual of Style (16^th Edition):

Bonito, Gregory Michael. “Factors regulating nitrogen mineralization along an elevation gradient in the southern appalachian mountains, USA.” 2001. Masters Thesis, University of Georgia. Accessed February 27, 2020. http://purl.galileo.usg.edu/uga_etd/bonito_gregory_m_200108_ms.

MLA Handbook (7^th Edition):

Bonito, Gregory Michael. “Factors regulating nitrogen mineralization along an elevation gradient in the southern appalachian mountains, USA.” 2001. Web. 27 Feb 2020.

Vancouver:

Bonito GM. Factors regulating nitrogen mineralization along an elevation gradient in the southern appalachian mountains, USA. [Internet] [Masters thesis]. University of Georgia; 2001. [cited 2020 Feb 27]. Available from: http://purl.galileo.usg.edu/uga_etd/bonito_gregory_m_200108_ms.

Council of Science Editors:

Bonito GM. Factors regulating nitrogen mineralization along an elevation gradient in the southern appalachian mountains, USA. [Masters Thesis]. University of Georgia; 2001. Available from: http://purl.galileo.usg.edu/uga_etd/bonito_gregory_m_200108_ms

University of Georgia

12. Baas, Peter. Nitrogen cycling, greenhouse gas emissions and land-use change in the southern Appalachian Mountains.

Degree: PhD, Ecology, 2014, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/baas_peter_201408_phd

► The nitrogen cycle is one of the most complex and spatially heterogeneous elemental cycles crucial for life on earth. The southern Appalachian Mountains are currently… (more)

▼ The nitrogen cycle is one of the most complex and spatially heterogeneous elemental cycles crucial for life on earth. The southern Appalachian Mountains are currently experiencing unprecedented increases in anthropogenic residential land use, which is projected to intensify over the next few decades. The future is also expected to bring greater nitrogen deposition and net primary productivity. Therefore, it is imperative that we develop a strong understanding of how ecosystems in this region will respond to projected environmental stressors. In order to address the high spatial variability of soil nitrogen cycling processes, I have developed a novel extrapolation approach based on geophysical tools to decrease the uncertainty around process estimates. Forest growth is mainly nitrogen limited in the temperate zone; however, the limitations of soil microbial activity and growth are far less clear. I found soil microbial respiration to be driven solely by carbon while nitrogen removal (i.e. denitrification) and retention was solely controlled by nitrate. These results suggest that a world of increased nitrogen and carbon availability will result in lower soil carbon sequestration and higher nitrogen removal (potentially in the form of the potent greenhouse gas N2O). In order to address the dominant pathways of nitrogen removal and retention, I assessed gross nitrogen cycling rates using 15N isotopic techniques. I showed nitrogen removal by nitrifier denitrification and denitrification to be prevalent in soils of all forest types. Nitrogen retention by dissimilatory nitrate reduction to ammonium (DRNA) is important in some forest soils. Riparian soils are crucial in mitigating terrestrial pollution from reaching the stream. Therefore, I assessed gross riparian nitrogen cycling processes and greenhouse gas emissions under the three dominant land use types in the region (i.e. forested, agricultural and residential). Soils in residential development had low rates of nitrogen cycling and high rates of CH4 emissions. This implies that future riparian zones will have lower nitrogen retention and removal capacity while reducing the riparian CH4 sink. In conclusion, southern Appalachian nitrogen cycling will likely be characterized by higher leaching into streams, greater gaseous efflux, and lower soil carbon sequestration. Advisors/Committee Members: Jacqueline Mohan.

Subjects/Keywords: Nitrogen cycling

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APA (6^th Edition):

Baas, P. (2014). Nitrogen cycling, greenhouse gas emissions and land-use change in the southern Appalachian Mountains. (Doctoral Dissertation). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/baas_peter_201408_phd

Chicago Manual of Style (16^th Edition):

Baas, Peter. “Nitrogen cycling, greenhouse gas emissions and land-use change in the southern Appalachian Mountains.” 2014. Doctoral Dissertation, University of Georgia. Accessed February 27, 2020. http://purl.galileo.usg.edu/uga_etd/baas_peter_201408_phd.

MLA Handbook (7^th Edition):

Baas, Peter. “Nitrogen cycling, greenhouse gas emissions and land-use change in the southern Appalachian Mountains.” 2014. Web. 27 Feb 2020.

Vancouver:

Baas P. Nitrogen cycling, greenhouse gas emissions and land-use change in the southern Appalachian Mountains. [Internet] [Doctoral dissertation]. University of Georgia; 2014. [cited 2020 Feb 27]. Available from: http://purl.galileo.usg.edu/uga_etd/baas_peter_201408_phd.

Council of Science Editors:

Baas P. Nitrogen cycling, greenhouse gas emissions and land-use change in the southern Appalachian Mountains. [Doctoral Dissertation]. University of Georgia; 2014. Available from: http://purl.galileo.usg.edu/uga_etd/baas_peter_201408_phd

University of Georgia

13. Drake, Sara Jean. Groundcover carbon and nitrogen cycling and legume nitrogen inputs in a frequently burned mixed pine forest.

Degree: MS, Plant Biology, 2004, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/drake_sara_j_200405_ms

► Southeastern pine forests are often managed with prescribed burning to promote a pine overstory. Soil texture may influence fire’s effect on vegetation and nutrient cycling.… (more)

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Drake, S. J. (2004). Groundcover carbon and nitrogen cycling and legume nitrogen inputs in a frequently burned mixed pine forest. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/drake_sara_j_200405_ms

Chicago Manual of Style (16^th Edition):

Drake, Sara Jean. “Groundcover carbon and nitrogen cycling and legume nitrogen inputs in a frequently burned mixed pine forest.” 2004. Masters Thesis, University of Georgia. Accessed February 27, 2020. http://purl.galileo.usg.edu/uga_etd/drake_sara_j_200405_ms.

MLA Handbook (7^th Edition):

Drake, Sara Jean. “Groundcover carbon and nitrogen cycling and legume nitrogen inputs in a frequently burned mixed pine forest.” 2004. Web. 27 Feb 2020.

Vancouver:

Drake SJ. Groundcover carbon and nitrogen cycling and legume nitrogen inputs in a frequently burned mixed pine forest. [Internet] [Masters thesis]. University of Georgia; 2004. [cited 2020 Feb 27]. Available from: http://purl.galileo.usg.edu/uga_etd/drake_sara_j_200405_ms.

Council of Science Editors:

Drake SJ. Groundcover carbon and nitrogen cycling and legume nitrogen inputs in a frequently burned mixed pine forest. [Masters Thesis]. University of Georgia; 2004. Available from: http://purl.galileo.usg.edu/uga_etd/drake_sara_j_200405_ms

University of Alberta

14. Kneteman, Kelly A. Phytoremediation of Nitrogen Impacted Soil and Groundwater at a Fertilizer Facility in Central Alberta.

Degree: MS, Department of Renewable Resources, 2012, University of Alberta

URL: https://era.library.ualberta.ca/files/5425kc08r

► In-situ remediation techniques such as phytoremediation have shown promise as economical alternatives for reducing the risk of environmental contaminants at impacted sites. Research trials were… (more)

Subjects/Keywords: nitrogen; phytoremediation

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APA (6^th Edition):

Kneteman, K. A. (2012). Phytoremediation of Nitrogen Impacted Soil and Groundwater at a Fertilizer Facility in Central Alberta. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/5425kc08r

Chicago Manual of Style (16^th Edition):

Kneteman, Kelly A. “Phytoremediation of Nitrogen Impacted Soil and Groundwater at a Fertilizer Facility in Central Alberta.” 2012. Masters Thesis, University of Alberta. Accessed February 27, 2020. https://era.library.ualberta.ca/files/5425kc08r.

MLA Handbook (7^th Edition):

Kneteman, Kelly A. “Phytoremediation of Nitrogen Impacted Soil and Groundwater at a Fertilizer Facility in Central Alberta.” 2012. Web. 27 Feb 2020.

Vancouver:

Kneteman KA. Phytoremediation of Nitrogen Impacted Soil and Groundwater at a Fertilizer Facility in Central Alberta. [Internet] [Masters thesis]. University of Alberta; 2012. [cited 2020 Feb 27]. Available from: https://era.library.ualberta.ca/files/5425kc08r.

Council of Science Editors:

Kneteman KA. Phytoremediation of Nitrogen Impacted Soil and Groundwater at a Fertilizer Facility in Central Alberta. [Masters Thesis]. University of Alberta; 2012. Available from: https://era.library.ualberta.ca/files/5425kc08r

Oregon State University

15. Damsky, Leon Joseph. Ammonia and nitrate nitrogen transformations in semi-arid soils of northeastern Oregon.

Degree: MS, Bacteriology, 1955, Oregon State University

URL: http://hdl.handle.net/1957/51832

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Damsky, L. J. (1955). Ammonia and nitrate nitrogen transformations in semi-arid soils of northeastern Oregon. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/51832

Chicago Manual of Style (16^th Edition):

Damsky, Leon Joseph. “Ammonia and nitrate nitrogen transformations in semi-arid soils of northeastern Oregon.” 1955. Masters Thesis, Oregon State University. Accessed February 27, 2020. http://hdl.handle.net/1957/51832.

MLA Handbook (7^th Edition):

Damsky, Leon Joseph. “Ammonia and nitrate nitrogen transformations in semi-arid soils of northeastern Oregon.” 1955. Web. 27 Feb 2020.

Vancouver:

Damsky LJ. Ammonia and nitrate nitrogen transformations in semi-arid soils of northeastern Oregon. [Internet] [Masters thesis]. Oregon State University; 1955. [cited 2020 Feb 27]. Available from: http://hdl.handle.net/1957/51832.

Council of Science Editors:

Damsky LJ. Ammonia and nitrate nitrogen transformations in semi-arid soils of northeastern Oregon. [Masters Thesis]. Oregon State University; 1955. Available from: http://hdl.handle.net/1957/51832

Oregon State University

16. Alexander, Joseph Richard. Nitrogen status in Oregon Coast Range forest communities.

Degree: MS, Forest Science, 1980, Oregon State University

URL: http://hdl.handle.net/1957/10169

► Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) roots in four plant communities – ocean spray (Holodiscus discolor (Pursh). Maxim.)/salal (Gaultheria shallon Pursh), vine maple (Acer circinatum Pursh)/salal, sword-fern… (more)

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Alexander, J. R. (1980). Nitrogen status in Oregon Coast Range forest communities. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/10169

Chicago Manual of Style (16^th Edition):

Alexander, Joseph Richard. “Nitrogen status in Oregon Coast Range forest communities.” 1980. Masters Thesis, Oregon State University. Accessed February 27, 2020. http://hdl.handle.net/1957/10169.

MLA Handbook (7^th Edition):

Alexander, Joseph Richard. “Nitrogen status in Oregon Coast Range forest communities.” 1980. Web. 27 Feb 2020.

Vancouver:

Alexander JR. Nitrogen status in Oregon Coast Range forest communities. [Internet] [Masters thesis]. Oregon State University; 1980. [cited 2020 Feb 27]. Available from: http://hdl.handle.net/1957/10169.

Council of Science Editors:

Alexander JR. Nitrogen status in Oregon Coast Range forest communities. [Masters Thesis]. Oregon State University; 1980. Available from: http://hdl.handle.net/1957/10169

Oregon State University

17. Sandstrom, Richard P. Incorporation of ¹⁵NO₃ into amino acids of Douglas-fir xylem sap.

Degree: MS, Forest Science, 1977, Oregon State University

URL: http://hdl.handle.net/1957/11058

► Roots are considered to be the major production site of amino acids that appear in the xylem sap of conifers. The carbon skeleton of amino… (more)

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Sandstrom, R. P. (1977). Incorporation of ¹⁵NO₃ into amino acids of Douglas-fir xylem sap. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/11058

Chicago Manual of Style (16^th Edition):

Sandstrom, Richard P. “Incorporation of ¹⁵NO₃ into amino acids of Douglas-fir xylem sap.” 1977. Masters Thesis, Oregon State University. Accessed February 27, 2020. http://hdl.handle.net/1957/11058.

MLA Handbook (7^th Edition):

Sandstrom, Richard P. “Incorporation of ¹⁵NO₃ into amino acids of Douglas-fir xylem sap.” 1977. Web. 27 Feb 2020.

Vancouver:

Sandstrom RP. Incorporation of ¹⁵NO₃ into amino acids of Douglas-fir xylem sap. [Internet] [Masters thesis]. Oregon State University; 1977. [cited 2020 Feb 27]. Available from: http://hdl.handle.net/1957/11058.

Council of Science Editors:

Sandstrom RP. Incorporation of ¹⁵NO₃ into amino acids of Douglas-fir xylem sap. [Masters Thesis]. Oregon State University; 1977. Available from: http://hdl.handle.net/1957/11058

Oregon State University

18. Garg, Hari Prasad. Detection and electric field quenching of nitrogen atoms in the 2s2p³3s ⁶S₅/2 meta-stable autoionizing state.

Degree: PhD, Physics, 1975, Oregon State University

URL: http://hdl.handle.net/1957/44060

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Garg, H. P. (1975). Detection and electric field quenching of nitrogen atoms in the 2s2p³3s ⁶S₅/2 meta-stable autoionizing state. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/44060

Chicago Manual of Style (16^th Edition):

Garg, Hari Prasad. “Detection and electric field quenching of nitrogen atoms in the 2s2p³3s ⁶S₅/2 meta-stable autoionizing state.” 1975. Doctoral Dissertation, Oregon State University. Accessed February 27, 2020. http://hdl.handle.net/1957/44060.

MLA Handbook (7^th Edition):

Garg, Hari Prasad. “Detection and electric field quenching of nitrogen atoms in the 2s2p³3s ⁶S₅/2 meta-stable autoionizing state.” 1975. Web. 27 Feb 2020.

Vancouver:

Garg HP. Detection and electric field quenching of nitrogen atoms in the 2s2p³3s ⁶S₅/2 meta-stable autoionizing state. [Internet] [Doctoral dissertation]. Oregon State University; 1975. [cited 2020 Feb 27]. Available from: http://hdl.handle.net/1957/44060.

Council of Science Editors:

Garg HP. Detection and electric field quenching of nitrogen atoms in the 2s2p³3s ⁶S₅/2 meta-stable autoionizing state. [Doctoral Dissertation]. Oregon State University; 1975. Available from: http://hdl.handle.net/1957/44060

Oregon State University

19. Spink, Thomas Joseph. The pressure and temperature effects on the solubility of nitrogen in distilled water: The temperature and pressure effects on the solubility of nitrogen in distilled water.

Degree: MS, Chemical Engineering, 1971, Oregon State University

URL: http://hdl.handle.net/1957/46154

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Spink, T. J. (1971). The pressure and temperature effects on the solubility of nitrogen in distilled water: The temperature and pressure effects on the solubility of nitrogen in distilled water. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/46154

Chicago Manual of Style (16^th Edition):

Spink, Thomas Joseph. “The pressure and temperature effects on the solubility of nitrogen in distilled water: The temperature and pressure effects on the solubility of nitrogen in distilled water.” 1971. Masters Thesis, Oregon State University. Accessed February 27, 2020. http://hdl.handle.net/1957/46154.

MLA Handbook (7^th Edition):

Spink, Thomas Joseph. “The pressure and temperature effects on the solubility of nitrogen in distilled water: The temperature and pressure effects on the solubility of nitrogen in distilled water.” 1971. Web. 27 Feb 2020.

Vancouver:

Spink TJ. The pressure and temperature effects on the solubility of nitrogen in distilled water: The temperature and pressure effects on the solubility of nitrogen in distilled water. [Internet] [Masters thesis]. Oregon State University; 1971. [cited 2020 Feb 27]. Available from: http://hdl.handle.net/1957/46154.

Council of Science Editors:

Spink TJ. The pressure and temperature effects on the solubility of nitrogen in distilled water: The temperature and pressure effects on the solubility of nitrogen in distilled water. [Masters Thesis]. Oregon State University; 1971. Available from: http://hdl.handle.net/1957/46154

University of Illinois – Urbana-Champaign

20. Yoder, Brian H. Corn yield following a delayed application of nitrogen.

Degree: MS, Crop Sciences, 2018, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/102524

► Delaying some of the N supplied to the corn crop is considered a way to increase N uptake and yield and to limit N losses,… (more)

▼ Delaying some of the N supplied to the corn crop is considered a way to increase N uptake and yield and to limit N losses, but the length of the delay may increase the risk of yield loss. We conducted a 3-year experiment at Urbana, Illinois in which half of the N (112 kg N ha-1) was injected as UAN at planting and the other half or all (224 kg N ha-1) of the N was dribbled UAN next to the row, at each of eight stages ranging from V3 to R3. In corn following soybean, when half of the N was applied at planting, the other half could be applied as late as R2 without significant yield loss, and application at R3 produced 92% of yield that the treatment with the second application at V3 did. Delaying application of all 224 kg N ha-1 through V15 did not decrease yield significantly, but yield declined by 12, 19 and 37% with application at VT, R2 and R3, respectively. In corn following corn, delaying the second half of the N to R3 produced 96% of the yield that the second application at V3 did, and none of the delayed timings lowered yields significantly. Delaying all the N to V9 did not significantly decrease yield, but yield thereafter decreased as the delay increased, from 11% less at V12 to 42% less at R3. Without N at planting, N needed to be applied by mid-vegetative stages to prevent yield loss, but when half the N was applied at planting, there was surprisingly little yield loss from delaying application until past pollination. SPAD readings showed that the split-N treatments were able to recover their healthy leaf color no matter how late N was applied, but with no N at planting, plants could not regain their full leaf color (or yield) if N was applied later than mid-vegetative stages. Our results indicate that even a lengthy delay in application of N can result in full yields, especially when half of the N is applied early. This application window is shortened if all of the N is delayed, in which case application should be made before plants reach mid-vegetative growth stages. Advisors/Committee Members: Nafziger, Emerson D. (advisor).

Subjects/Keywords: Corn; Nitrogen

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APA (6^th Edition):

Yoder, B. H. (2018). Corn yield following a delayed application of nitrogen. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/102524

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):

Yoder, Brian H. “Corn yield following a delayed application of nitrogen.” 2018. Thesis, University of Illinois – Urbana-Champaign. Accessed February 27, 2020. http://hdl.handle.net/2142/102524.

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

MLA Handbook (7^th Edition):

Yoder, Brian H. “Corn yield following a delayed application of nitrogen.” 2018. Web. 27 Feb 2020.

Vancouver:

Yoder BH. Corn yield following a delayed application of nitrogen. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2018. [cited 2020 Feb 27]. Available from: http://hdl.handle.net/2142/102524.

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

Council of Science Editors:

Yoder BH. Corn yield following a delayed application of nitrogen. [Thesis]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/102524

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

Kansas State University

21. Kunerth, Bernice Lydia. The utilization by human subjects of nitrogen from beef round and beef heart.

Degree: 1933, Kansas State University

URL: http://hdl.handle.net/2097/35918

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Kunerth, B. L. (1933). The utilization by human subjects of nitrogen from beef round and beef heart. (Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/35918

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):

Kunerth, Bernice Lydia. “The utilization by human subjects of nitrogen from beef round and beef heart.” 1933. Thesis, Kansas State University. Accessed February 27, 2020. http://hdl.handle.net/2097/35918.

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

MLA Handbook (7^th Edition):

Kunerth, Bernice Lydia. “The utilization by human subjects of nitrogen from beef round and beef heart.” 1933. Web. 27 Feb 2020.

Vancouver:

Kunerth BL. The utilization by human subjects of nitrogen from beef round and beef heart. [Internet] [Thesis]. Kansas State University; 1933. [cited 2020 Feb 27]. Available from: http://hdl.handle.net/2097/35918.

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

Council of Science Editors:

Kunerth BL. The utilization by human subjects of nitrogen from beef round and beef heart. [Thesis]. Kansas State University; 1933. Available from: http://hdl.handle.net/2097/35918

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

University of British Columbia

22. Tregidga, Angus C. A spectroscopic investigation of the formation of active nitrogen .

Degree: 1935, University of British Columbia

URL: http://hdl.handle.net/2429/38491

[No abstract available]

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Tregidga, A. C. (1935). A spectroscopic investigation of the formation of active nitrogen . (Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/38491

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):

Tregidga, Angus C. “A spectroscopic investigation of the formation of active nitrogen .” 1935. Thesis, University of British Columbia. Accessed February 27, 2020. http://hdl.handle.net/2429/38491.

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

MLA Handbook (7^th Edition):

Tregidga, Angus C. “A spectroscopic investigation of the formation of active nitrogen .” 1935. Web. 27 Feb 2020.

Vancouver:

Tregidga AC. A spectroscopic investigation of the formation of active nitrogen . [Internet] [Thesis]. University of British Columbia; 1935. [cited 2020 Feb 27]. Available from: http://hdl.handle.net/2429/38491.

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

Council of Science Editors:

Tregidga AC. A spectroscopic investigation of the formation of active nitrogen . [Thesis]. University of British Columbia; 1935. Available from: http://hdl.handle.net/2429/38491

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

Michigan State University

23. Chamberlain, Clark Sherman. The use of selenium compounds in the kjeldahl nitrogen determination.

Degree: MS, 1933, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:8952

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Chamberlain, C. S. (1933). The use of selenium compounds in the kjeldahl nitrogen determination. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:8952

Chicago Manual of Style (16^th Edition):

Chamberlain, Clark Sherman. “The use of selenium compounds in the kjeldahl nitrogen determination.” 1933. Masters Thesis, Michigan State University. Accessed February 27, 2020. http://etd.lib.msu.edu/islandora/object/etd:8952.

MLA Handbook (7^th Edition):

Chamberlain, Clark Sherman. “The use of selenium compounds in the kjeldahl nitrogen determination.” 1933. Web. 27 Feb 2020.

Vancouver:

Chamberlain CS. The use of selenium compounds in the kjeldahl nitrogen determination. [Internet] [Masters thesis]. Michigan State University; 1933. [cited 2020 Feb 27]. Available from: http://etd.lib.msu.edu/islandora/object/etd:8952.

Council of Science Editors:

Chamberlain CS. The use of selenium compounds in the kjeldahl nitrogen determination. [Masters Thesis]. Michigan State University; 1933. Available from: http://etd.lib.msu.edu/islandora/object/etd:8952

Michigan State University

24. Davidson, John H. Distribution of nitrogen in the leaves of certain species of the Rosaceae.

Degree: MS, 1940, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:31951

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Davidson, J. H. (1940). Distribution of nitrogen in the leaves of certain species of the Rosaceae. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:31951

Chicago Manual of Style (16^th Edition):

Davidson, John H. “Distribution of nitrogen in the leaves of certain species of the Rosaceae.” 1940. Masters Thesis, Michigan State University. Accessed February 27, 2020. http://etd.lib.msu.edu/islandora/object/etd:31951.

MLA Handbook (7^th Edition):

Davidson, John H. “Distribution of nitrogen in the leaves of certain species of the Rosaceae.” 1940. Web. 27 Feb 2020.

Vancouver:

Davidson JH. Distribution of nitrogen in the leaves of certain species of the Rosaceae. [Internet] [Masters thesis]. Michigan State University; 1940. [cited 2020 Feb 27]. Available from: http://etd.lib.msu.edu/islandora/object/etd:31951.

Council of Science Editors:

Davidson JH. Distribution of nitrogen in the leaves of certain species of the Rosaceae. [Masters Thesis]. Michigan State University; 1940. Available from: http://etd.lib.msu.edu/islandora/object/etd:31951

Technical University of Lisbon

25. Gonçalves, Vitória Maria Pereira. Impact of nitrogen into the environment. A step on nitrogen footprint calculation in Lisbon, Portugal.

Degree: 2013, Technical University of Lisbon

URL: https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5738

►

Mestrado em Engenharia do Ambiente - Instituto Superior de Agronomia

The use of anthropogenic sources of nitrogen (N) in food and energy production has negative… (more)

Subjects/Keywords: energy; environment; nitrogen losses; nitrogen footprint; consumption

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APA (6^th Edition):

Gonçalves, V. M. P. (2013). Impact of nitrogen into the environment. A step on nitrogen footprint calculation in Lisbon, Portugal. (Thesis). Technical University of Lisbon. Retrieved from https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5738

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):

Gonçalves, Vitória Maria Pereira. “Impact of nitrogen into the environment. A step on nitrogen footprint calculation in Lisbon, Portugal.” 2013. Thesis, Technical University of Lisbon. Accessed February 27, 2020. https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5738.

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

MLA Handbook (7^th Edition):

Gonçalves, Vitória Maria Pereira. “Impact of nitrogen into the environment. A step on nitrogen footprint calculation in Lisbon, Portugal.” 2013. Web. 27 Feb 2020.

Vancouver:

Gonçalves VMP. Impact of nitrogen into the environment. A step on nitrogen footprint calculation in Lisbon, Portugal. [Internet] [Thesis]. Technical University of Lisbon; 2013. [cited 2020 Feb 27]. Available from: https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5738.

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

Council of Science Editors:

Gonçalves VMP. Impact of nitrogen into the environment. A step on nitrogen footprint calculation in Lisbon, Portugal. [Thesis]. Technical University of Lisbon; 2013. Available from: https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5738

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

Texas A&M University

26. Winsco, Kelly Nicole. Influence of Methionine on Growth and Nitrogen Balance in Weanling Quarter Horses.

Degree: 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7623

► Twenty-four Quarter horse weanlings (120 d +/- 10 d) were blocked by age into 4 groups (n = 6) for a 56 d trial to… (more)

▼ Twenty-four Quarter horse weanlings (120 d +/- 10 d) were blocked by age into 4 groups (n = 6) for a 56 d trial to evaluate the influence of methionine on growth and nitrogen retention. Weanlings were housed by block and individually fed 1 of 4 concentrate diets twice daily at 1.5% BW (as fed). Weanlings were randomly assigned to 1 of 4 treatments: basal (0.20 MET), basal + 0.03% methionine (0.23 MET), basal + 0.07% methionine (0.27 MET), and basal + 0.11% methionine (0.31 MET). Diets were formulated to be isonitrogenous, isocaloric, and contain equal amounts of LYS and THR. Coastal bermudagrass hay was individually fed at 0.75% BW (as fed). Growth measurements, body weight, rump fat, and plasma were obtained every 7 d. The final 4 days consisted of total collection of urine and feces. Feed, fecal, and urine samples were analyzed for nitrogen content and nitrogen balance was calculated. Urine was analyzed for urea and ammonia concentration. Plasma was analyzed for urea concentration. Grain, hay, and fecal samples were analyzed for nutrient composition. Data were analyzed using the PROC MIX procedure of SAS. Linear, quadratic, and cubic effects were tested in the form of contrasts. There was no influence of treatment on growth measurements, nitrogen balance, or urinary urea or ammonia. Intake of LYS and THR (g/d) did not differ among treatments (P = 0.78 and P = 0.38 respectively). Plasma urea nitrogen (PUN) was influenced by treatment (P = 0.005) exhibiting quadratic (P = 0.04) and cubic (P = 0.002) effects. An unexpected peak in PUN was observed with 0.27 MET. Upon analysis, 0.20 MET contained more lysine than formulated, and 0.27 MET contained the least lysine. Treatments 0.20 MET and 0.31 MET contained more threonine compared to formulations. These differences may explain unexpected values of PUN concentration. Results suggest future studies that more closely isolate methionine as the only dietary variable are necessary to better explain the methionine requirements of weanling horses. Advisors/Committee Members: Coverdale, Josie A. (advisor), Wickersham, Tryon A. (committee member), Carey, John B. (committee member).

Subjects/Keywords: methionine; nitrogen balance; plasma urea nitrogen; weanling

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

APA (6^th Edition):

Winsco, K. N. (2011). Influence of Methionine on Growth and Nitrogen Balance in Weanling Quarter Horses. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7623

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):

Winsco, Kelly Nicole. “Influence of Methionine on Growth and Nitrogen Balance in Weanling Quarter Horses.” 2011. Thesis, Texas A&M University. Accessed February 27, 2020. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7623.

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

MLA Handbook (7^th Edition):

Winsco, Kelly Nicole. “Influence of Methionine on Growth and Nitrogen Balance in Weanling Quarter Horses.” 2011. Web. 27 Feb 2020.

Vancouver:

Winsco KN. Influence of Methionine on Growth and Nitrogen Balance in Weanling Quarter Horses. [Internet] [Thesis]. Texas A&M University; 2011. [cited 2020 Feb 27]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7623.

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

Council of Science Editors:

Winsco KN. Influence of Methionine on Growth and Nitrogen Balance in Weanling Quarter Horses. [Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7623

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

University of Aberdeen

27. Freitag, Sabine. Metabolic differentation in the lichen Cladonia portentosa from different wet nitrogen deposition regimes.

Degree: 2010, University of Aberdeen

URL: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=165541 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540327

► The deposition of atmospheric nitrogen is now recognized as a major driver of biodiversity changes at mid to high latitudes. It has previously been shown… (more)

▼ The deposition of atmospheric nitrogen is now recognized as a major driver of biodiversity changes at mid to high latitudes. It has previously been shown that regional variations in wet nitrogen deposition in the British Isles are reflected in broad targeted chemical parameters in the common heathland lichen Cladonia portentosa. A more detail analysis of alterations in the metabolic pathways in Cladonia portentosa collected from different locations within the UK was undertaken by applying the environmental metabolomics approach. Fourier transform infrared spectroscopy (FTIR) and liquid chromatography mass spectrometry (LC-MS) were applied in combination with principal component analysis (PCA) and partial least squares regression analysis (PLSR). The latter statistical method was used to correlate measured variables with modelled atmospheric data including wet nitrogen deposition, nitrogen concentration and precipitation. While FTIR in combination with PCA and PLSR revealed signatures of broad metabolic classes, LC-MS in combination with PCA and PLSR allowed the identification of betaine lipids (BL) as potential biomarkers of nitrogen enrichment. A compound tentatively identified as monoacylglycerol-(N,N,N trimethyl)-homoserine (MGTS) showed the strongest positive relation to increasing wet nitrogen deposition regimes and consequent phosphorus deficiency. In contrast, the structurally related phosphatidylcholine containing a C18:2 ester showed the opposite trend in natural populations of C. portentosa. Results obtained for C. portentosa collected from the N manipulation site Whim Moss indicated that ammonium is causal for the increase of two of the identified betaine lipids in natural populations in C. portentosa. Betaine lipids as well as the phosphatidylcholine biomarker could potentially be used to monitor nitrogen regimes and resulting phosphorus limitation on the lichen C. portentosa. The approach used for this study represented an effective integration of the complementary analytical techniques of FTIR and LC-MS in combination with multivariate statistical tools for environmental metabolomic studies.

Subjects/Keywords: 581.7; Atmospheric nitrogen oxides : Lichens : Nitrogen compounds

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

APA (6^th Edition):

Freitag, S. (2010). Metabolic differentation in the lichen Cladonia portentosa from different wet nitrogen deposition regimes. (Doctoral Dissertation). University of Aberdeen. Retrieved from http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=165541 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540327

Chicago Manual of Style (16^th Edition):

Freitag, Sabine. “Metabolic differentation in the lichen Cladonia portentosa from different wet nitrogen deposition regimes.” 2010. Doctoral Dissertation, University of Aberdeen. Accessed February 27, 2020. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=165541 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540327.

MLA Handbook (7^th Edition):

Freitag, Sabine. “Metabolic differentation in the lichen Cladonia portentosa from different wet nitrogen deposition regimes.” 2010. Web. 27 Feb 2020.

Vancouver:

Freitag S. Metabolic differentation in the lichen Cladonia portentosa from different wet nitrogen deposition regimes. [Internet] [Doctoral dissertation]. University of Aberdeen; 2010. [cited 2020 Feb 27]. Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=165541 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540327.

Council of Science Editors:

Freitag S. Metabolic differentation in the lichen Cladonia portentosa from different wet nitrogen deposition regimes. [Doctoral Dissertation]. University of Aberdeen; 2010. Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=165541 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540327

28. Bunch, Nathan D. Microbial response to nitrogen availability : preferential and adaptive community uptake.

Degree: Thesis (M.S.), 2010, Ball State University

URL: http://cardinalscholar.bsu.edu/handle/123456789/193653

► This project was designed to assess the ability of natural sediment microbial communities and single species microbial populations to preferentially utilize inorganic forms of nitrogen… (more)

Subjects/Keywords: Nitrogen-fixing microorganisms.; Nitrogen – Fixation.; River sediments.

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

APA (6^th Edition):

Bunch, N. D. (2010). Microbial response to nitrogen availability : preferential and adaptive community uptake. (Masters Thesis). Ball State University. Retrieved from http://cardinalscholar.bsu.edu/handle/123456789/193653

Chicago Manual of Style (16^th Edition):

Bunch, Nathan D. “Microbial response to nitrogen availability : preferential and adaptive community uptake.” 2010. Masters Thesis, Ball State University. Accessed February 27, 2020. http://cardinalscholar.bsu.edu/handle/123456789/193653.

MLA Handbook (7^th Edition):

Bunch, Nathan D. “Microbial response to nitrogen availability : preferential and adaptive community uptake.” 2010. Web. 27 Feb 2020.

Vancouver:

Bunch ND. Microbial response to nitrogen availability : preferential and adaptive community uptake. [Internet] [Masters thesis]. Ball State University; 2010. [cited 2020 Feb 27]. Available from: http://cardinalscholar.bsu.edu/handle/123456789/193653.

Council of Science Editors:

Bunch ND. Microbial response to nitrogen availability : preferential and adaptive community uptake. [Masters Thesis]. Ball State University; 2010. Available from: http://cardinalscholar.bsu.edu/handle/123456789/193653

Tokyo Institute of Technology / 東京工業大学

29. LE, QUYNH NGA. Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column : Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column.

Degree: 博士（工学）, 2015, Tokyo Institute of Technology / 東京工業大学

URL: http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100695749

► Nitrogen (N) is a major nutrient that affects productivity in freshwater systems. However, the existing knowledge on the interaction between suspended particles and N transformation… (more)

Subjects/Keywords: Nitrogen dymanics; suspended particles; nitrification; dissolved nitrogen

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APA (6^th Edition):

LE, Q. N. (2015). Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column : Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column. (Thesis). Tokyo Institute of Technology / 東京工業大学. Retrieved from http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100695749

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):

LE, QUYNH NGA. “Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column : Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column.” 2015. Thesis, Tokyo Institute of Technology / 東京工業大学. Accessed February 27, 2020. http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100695749.

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

MLA Handbook (7^th Edition):

LE, QUYNH NGA. “Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column : Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column.” 2015. Web. 27 Feb 2020.

Vancouver:

LE QN. Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column : Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column. [Internet] [Thesis]. Tokyo Institute of Technology / 東京工業大学; 2015. [cited 2020 Feb 27]. Available from: http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100695749.

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

Council of Science Editors:

LE QN. Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column : Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column. [Thesis]. Tokyo Institute of Technology / 東京工業大学; 2015. Available from: http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100695749

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

Penn State University

30. Junium, Christopher Kendall. Nitrogen biogeochemistry and ancient oceanic anoxia.

Degree: PhD, Geoscience, 2010, Penn State University

URL: https://etda.libraries.psu.edu/catalog/10628

► This study is an exploration of the links between nitrogen biogeochemistry and ancient oceanic anoxia. The goal of this dissertation is to answer the question:… (more)

▼ This study is an exploration of the links between nitrogen biogeochemistry and ancient oceanic anoxia. The goal of this dissertation is to answer the question: Is enhanced N2-fixation a necessary response to widespread oceanic anoxia? Understanding the N-cycle is important because N is one of the primary nutrients limiting carbon fixation on Earth. Over geologic time scales, N availability, along with that of P and Fe, impacts the regulation of atmospheric CO2 and climate through the limitation of carbon fixation by photoautotrophs in the oceans and on land. This work focuses on understanding the geologic record of the nitrogen cycle during episodes of ancient oceanic oxygen deprivation during the mid-Cretaceous and Neoproterozoic, and the processes controlling the preservation of N-cycle proxies in Holocene surface sediments of the Peru Margin. Under anoxic conditions, nutrient N is lost from the ocean through microbial metabolic processes but P is more efficiently recycled (Ingall and Janke, 1993). It could be envisioned that intervals of more widespread marine anoxia would significantly impact the balance of the marine nutrient cycles, affecting biological productivity. As geoscientists, we provide a unique perspective that can help answer some of the most important questions regarding the evolution of the N-cycle through time, the biological evolution of the earth, and the potential impacts of natural and anthropogenic climate change. To assess the state of the ancient nitrogen cycle I have focused on the isolation and N-isotopic analysis of chlorophyll derivatives (e.g. porphyrins and chlorins), and bulk organic extracts. Utilization of porphyrins and chlorins for compound-specific nitrogen isotope analysis requires an in-depth analysis of the processes that control their transformation and preservation over geologic time and in modern environments. A significant proportion of this work focuses on the abundances and distribution of porphyrins and chlorins in addition to N-isotopic analysis. In this study, initial investigation focused on the preserved chlorophyll derivatives of the Cretaceous strata recovered from the Demerara Rise. This work yielded unexpected discoveries of high abundances of bicycloalkanoporphyrins (BiCAPs), present as free bases (metal free) and Zn and VO2+ complexes. The occurrence of Zn bicycloalkanoporphyrins represents the first occurrence of primary Zn porphyrins found in the geologic record. Structural confirmation of the chlorin mesochlorophyllone in the Demerara Rise black shales represents the oldest such occurrence in the geologic record by over 70 million years; its presence suggests that the abundant bicycloalkanoporphyrins in the Demerara Rise sediments are derived from chlorophyll a, the only possible precursor for mesochlorophyllone. The stratigraphic distribution of BiCAPS is controlled, foremost, by metal availability in the water column and sediments rather than early diagenesis Eh/pH conditions, or post depositional thermal maturity. Titration of the local water-column…

Subjects/Keywords: nitrogen cycle; nitrogen isotopes; black shale; porphyrins

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

APA (6^th Edition):

Junium, C. K. (2010). Nitrogen biogeochemistry and ancient oceanic anoxia. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/10628

Chicago Manual of Style (16^th Edition):

Junium, Christopher Kendall. “Nitrogen biogeochemistry and ancient oceanic anoxia.” 2010. Doctoral Dissertation, Penn State University. Accessed February 27, 2020. https://etda.libraries.psu.edu/catalog/10628.

MLA Handbook (7^th Edition):

Junium, Christopher Kendall. “Nitrogen biogeochemistry and ancient oceanic anoxia.” 2010. Web. 27 Feb 2020.

Vancouver:

Junium CK. Nitrogen biogeochemistry and ancient oceanic anoxia. [Internet] [Doctoral dissertation]. Penn State University; 2010. [cited 2020 Feb 27]. Available from: https://etda.libraries.psu.edu/catalog/10628.

Council of Science Editors:

Junium CK. Nitrogen biogeochemistry and ancient oceanic anoxia. [Doctoral Dissertation]. Penn State University; 2010. Available from: https://etda.libraries.psu.edu/catalog/10628

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