Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 612 for “"Stable isotope"”.
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Chlorine in ground water : stable isotope distribution
… weight measurements revealed no variation of the stable isotope ratio, 37C1/ 35C1 (with precision up to 1.0%.) in natural materials. This result is not surprising because chlorine occurs in relatively few compounds, has a strong affinity for the liquid phase, occurs mostly in the -1 oxidation …
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Stable isotope geochemistry of nitrogen in marine particulates
Isotope studies of nitrogen and carbon were undertaken to investigate the fate of particulate organic matter (POM) during its residence in the water column and after deposition on the seafloor. The processes focused on were water-column transformations and sedimentary diagenesis. Sampling sites …
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Stable isotope analysis: a new forensic science tool
… the development of the analytical technique isotope ratio mass spectrometry (IRMS) has increased the information obtainable regarding sample origin and history.<br/><br/>Investigations were carried out on white paint samples using Elemental Analysis Isotope Ratio Mass Spectrometry (EA-IRMS) …
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Stable isotope ecology of South African kelp forests
… prompting a renewed focus on these systems. Stable Isotope Analysis (SIA) is an indispensable tool for investigating food web characteristics, with particular focus on trophic structure and functioning. SIA can be used to understand the basal isotope variability in producers, determine the …
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Stable isotope hydrology of the Table Mountain group
… from mixing during groundwater flow. Rainfall isotope composition is negatively correlated with continentality, as defined by the product of distance to the Atlantic and the closest coast. Isotope composition of rainfall is also strongly negatively correlated with altitude. Sites that are …
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Stable isotope geochemistry of nitrogen in marine particulates
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1983.
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Provenancing humans: the real uncertainty of stable isotope data
Stable isotope profiling is a relatively new technique within the field of human identification. It allows forensic investigators to deduce information pertaining to an individual’s geographical provenance, recent movements, and even dietary intake. Human identification requires the development of …
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Stable isotope ecology of modern herbivores from Mmabolela, Limpopo
This thesis explores the stable isotope ecology of 12 species of co-existing wild herbivores (11 mammals and one reptile) (62 individuals) from Mmabolela, a game farm on the northern border of South Africa in the Limpopo Province. The aim is to investigate and interpret patterns in δ13C, δ15N and …
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Climate significance of stable isotope records from Alpine ice cores
… liegt. Die derzeitigen mehrjährigen Mittel der Isotopentemperatur sind mit die wärmsten innerhalb des vergangenen Jahrtausends. Das beispiellose Temperaturminimum um 1340 A.D. weist um mehr als 1°C niedrigere mehrjährige Mittel der Isotopentemperatur auf. Alle drei Kerne zeigen eine isotopisch …
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Global coal ball stable isotope analysis to define permineralizing environments
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Organic geochemistry and stable isotope constraints on Precambrian biogeochemical processes
… of these geologic intervals by examining stable isotopic signatures and molecular fossils (biomarkers) in Late Proterozoic and Mesoarchean ages sedimentary rocks in Northwestern Territories, Canada and Pilbara, Western Australia, respectively. This thesis presents sulfur, carbon, oxygen …
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Metabolism and pharmacokinetic studies of valproic acid using stable isotope techniques
… that metabolites may play during VPA therapy. Stable isotope techniques and gas chromatography mass spectrometry (GCMS) have been used in several areas of research on VPA. For example the application of a stable isotope labelled analog as a "pulse dose" in antiepileptic drug studies allows the …
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Estimating Trophic Position of Lake Oahe Walleye Using Stable Isotope Analysis
… populations are sampled infrequently. I used stable isotope analysis to estimate walleye trophic position and then compared these values to trophic position estimates from diet content analysis for fish sampled from May 2001 to May 2002. Trophic position estimates generated by isotopes were …
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A heavy stable isotope approach to tracing mantle source and process
… part of this variability. Recently, heavy stable isotopes have been suggested as a new tool to complement existing tracers of mantle heterogeneity and lithology (e.g., major and trace elements, radiogenic isotopes), because mineral- and redox-specific equilibrium stable isotope …
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Exploring Social Identity through Stable Isotope Analysis in the Kellis 2 Cemetery
… the variation existing throughout the empire. Stable isotope analysis has the potential to reveal variability in lived experience of past peoples by acting as a proxy for behavior that can be analyzed from bone. Such an approach has been applied on individuals from the Romano-Christian Kellis 2 …
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Stable isotope and trace element fractionation and implications for chemical weathering rates
The student, Nicole Fernandez-Franzan, accepted the attached license on 2020-05-05 at 04:05.
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Flight feather moult patterns and stable isotope analysis in the Woodland Kingfisher
… grounds of the Woodland Kingfisher, I measured stable isotope ratios of carbon (δ 13C), nitrogen (δ 15N) and hydrogen (δ 2H) in primary (P1), secondary (S1) and tail (R1) feathers from birds caught in Ghana, South Africa and Uganda between 2015 and 2018 during the respective breeding seasons. …
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Trophic transfer of nearshore basal resources: interpreting fatty acid and stable isotope biomarkers
… markers such as fatty acids (FA) and multiple stable isotopes (MSI; collectively FAMSI) can help resolve which sources are actually important in consumers, but several key uncertainties in the assumptions of the approach limit its utility. In this dissertation, I used a combination of …
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In vivo 13C stable isotope tracing of single leaf development in the cold
… measurements is the in vivo integration of a stable or radioactive label into a plant without perturbation of the system. To follow the carbon flow of a precursor metabolite, a method is developed in this work that is based on metabolite profiling of primary metabolites measured with a mass …
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