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Showing 1 to 20 of 42 for “"Nitrogen Isotope"”.
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Emission Spectrometric Determination of the Nitrogen Isotope Ratio
Made available in DSpace on 2014-12-09T17:36:48Z (GMT). No. of bitstreams: 1 7020997.pdf: 2736035 bytes, checksum: 4fbf797ff1acfbc692d745a48e0ec5ea (MD5) Previous issue date: 1970
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Nitrogen isotope variation in the environment: Implications for interpretation
… unpredictable nature of 15N limits the use of N isotope natural abundance (d15N) in tracing the flow and fate of N in environments. Recent investigations have, however, revealed consistent and repeatable patterns of 15N in some ecosystem components. These patterns suggest that d15N may yet …
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The Application of Quadrupole Mass Spectrometry to Nitrogen Isotope Analysis
Made available in DSpace on 2014-12-10T23:02:05Z (GMT). No. of bitstreams: 1 7511577.pdf: 2340967 bytes, checksum: c4a39fcb58a0915e9fbe40e88285caa5 (MD5) Previous issue date: 1974
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Diet at medieval Alytus, Lithuania: Stable carbon and nitrogen isotope analysis of bone and dentin collagen
… and animals consuming C3 plants. The stable nitrogen isotopic data indicate the use of aquatic resources, and reflects the protein portion of the diet as including mainly terrestrial non-legumes. There are no significant differences in the pattern of resource consumption between juvenile …
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Microscopic Sampling of Dentine and Bone Collagen: Development of Sampling Methods for Carbon and Nitrogen Isotope Analysis
… throughout that time. As the technology for isotope ratio mass spectrometry analysis improves, the sampling methods should improve as well. This research focused on developing a new incremental dentine collagen sampling method and bone collagen microsampling method for stable isotope …
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Microscopic Sampling of Dentine and Bone Collagen: Development of Sampling Methods for Carbon and Nitrogen Isotope Analysis
… throughout that time. As the technology for isotope ratio mass spectrometry analysis improves, the sampling methods should improve as well. This research focused on developing a new incremental dentine collagen sampling method and bone collagen microsampling method for stable isotope …
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The role of biological production in pleistocene atmospheric carbon dioxide variations and the nitrogen isotope dynamics of the southern ocean
… cause for these variations. The use of N isotopes as a paleoceanographic proxy for nitrate utilization in Southern Ocean was investigated. In order to examine the generation of the link between nitrate utilization and N isotopes in the surface ocean, the isotopic composition of nitrate was …
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The role of biological production in pleistocene atmospheric carbon dioxide variations and the nitrogen isotope dynamics of the southern ocean
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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Of fish, pigs and cesspits : a comparative study of stable carbon and nitrogen isotope analyses on animal bone and soil samples from five medieval sites in Belguim
… researchers have started to apply stable isotope techniques to diet reconstruction. Most studies have focused on the analysis of human bone collagen. In this research, human skeletal remains were not available, so ¹³C/¹²C and ¹⁵N/¹⁴N analyses were made on animal bones and soil samples from …
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Stable carbon and nitrogen isotope ratios in the shallow-water cape hake, merluccius capensis (castelnau) as indicators of trophic position and diet on the west and south coasts of South Africa
… recent diet of hake, therefore stable carbon and nitrogen isotope ratios were used to show the longer-term diet, integrated over the turnover time of the muscle tissue and bone collagen analysed. 13C/12C is 1-2%₀ higher in the tissues of a consumer than its diet (DeNiro and Epstein 1978), the …
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An isotopic and historical study of diet and migration during the great Irish Potato famine (1845-1852). High-resolution carbon and nitrogen isotope profiling of teeth to investigate migration and short-term dietary change at the Union workhouse, Kilkenny and Lukin street, London.
… Kilkenny, Ireland (1847-51), mean bone collagen isotope values were established for the well-documented Irish pre-Famine potato-based diet (¿15N 10.6¿, ¿13C -19.1¿), and the diet of contemporaneous Londoners (¿15N 12.6¿, ¿13C -19.1¿). The introduction of maize as a short-term Famine relief food …
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Tracking diet and movement of Atlantic bluefin tuna (Thunnus thynnus) using carbon and nitrogen stable isotopes
… challenging. Naturally occurring stable isotopes have been used to study diet and movement in many aquatic ecosystems and offer a novel approach for studying these large pelagic fishes.</p><p>Lipids, which have lower carbon isotope values than protein, can affect isotope analyses of bulk …
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Rivalry for nutrient resources : is there competition below ground between leguminous trees and grasses in a mesic and arid savanna in the Kruger National Park?
… C₃ trees and C₄ grasses relative to soil nitrogen, phosphorus and water profiles using stable carbon and nitrogen isotope ratios (of the fine roots). The study occurs on a mesic savanna (737 mm MAP) site on sandy-loam soils and an arid savanna (547 mm MAP) site on clay-rich soils in the …
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Halogenated 1'-methyl-1,2'-bipyrroles (MBPs) in the northwestern Atlantic
… origins of these compounds through their stable nitrogen isotopic signatures. Results from these investigations have shown that over 40 highly brominated MBP congeners are present in marine mammals, fish, and squid from the Northwestern Atlantic Ocean. The most abundant MBPs do appear to …
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Childhood diet and mobility at medieval (1240s AD) Solt-Tetelhegy, Hungary as reconstructed from stable carbon, nitrogen, and oxygen isotope analysis
… site of Solt-Tételhegy. Stable carbon and nitrogen isotope analyses were conducted on dental enamel and dentin from 24 individuals to examine their childhood diet. Although previous stable isotopic research has described the diet of medieval European peoples, this is the first such study on …
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AN OSTEOBIOGRAPHICAL ANALYSIS OF THE FOSCUE PLANTATION BURIAL VAULT, POLLOCKSVILLE, JONES COUNTY, NORTH CAROLINA
… areas of the Eastern seaboard. Stable carbon and nitrogen isotope analysis provide further insight into rural antebellum diets. The detailed osteobiographies presented in this study, along with the historical documents, provide a renewed picture of a cross-section of a rural plantation-owning …
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Reducing the Environmental Impact of Seacage Fish Farming Through Cultivation of Seaweed
… is heavily influenced by local hydrography. Nitrogen content of L. saccharina and P. palmata cultured adjacent to the salmon cages in summer was higher than in seaweeds cultured at reference sites away from fish cages.<br/>Stable nitrogen isotope analysis indicates that the nitrogen in …
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Can nitrogen isotopes be used to detect the effects of burning on nitrogen cycling? : a study on Pinus resinosa in Minnesota, USA
… and coarse roots from stands were analysed for nitrogen isotopes in an attempt to determine if fire effects nitrogen cycling. Fire increased the % nitrogen of coarse roots and changed the ratio of C: N. It may also decrease the depth of the A-horizon. It did not however affect the nitrogen …
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Can nitrogen isotopes be used to detect the effects of burning on nitrogen cycling? A study on Pinus resinosa in Minnesota, USA
… and coarse roots from stands were analysed for nitrogen isotopes in an attempt to determine if fire effects nitrogen cycling. Fire increased the % nitrogen of coarse roots and changed the ratio of C: N. It may also decrease the depth of the A-horizon. It did not however affect the nitrogen …
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