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Dissertations / Theses on the topic 'Isotopic abundance'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Jezequel, Tangi. "Methodological developments for highly accurate quantitative ¹³C NMR : applied to isotopic analysis at natural abundance." Thesis, Nantes, 2018. http://www.theses.fr/2018NANT4058/document.

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L’analyse isotopique position-spécifique est une application de la RMN ¹³C quantitative qui permet de déterminer l’origine de molécules biologiques ou synthétiques grâce à la détermination de la distribution intramoléculaire du ¹³C au sein d’un composé organique. Jusqu’à présent, l’analyse ¹³C par PSIA nécessitait la combinaison de mesures par spectrométrie de masse de rapport isotopique avec des analyses par RMN ¹³C quantitative afin de déterminer les compositions isotopiques des différents carbones. Cependant, cette stratégie présente plusieurs inconvénients : (i) l’utilisation de deux techn

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2

Murray, Andrew P. "Factors controlling the abundance and carbon isotopic composition of land-plant derived compounds in crude oils." Thesis, Curtin University, 1998. http://hdl.handle.net/20.500.11937/1100.

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This thesis describes a study in petroleum geochemistry and specifically of the application of Land-plant derived hydrocarbons to elucidating source matter type, depositional environment and thermal maturity of crude oils. Large volumes of petroleum have been generated from land-plant organic matter in many parts of the world, but especially in the Tertiary deltaic provinces of the USA, Canada, Africa, Southeast Asia, Australia and New Zealand. Compared to oils from other regions, these oils have a relatively complex pattern of biomarkers or molecular fossils, a feature reflecting the diversit

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3

Leshin, Laurie Ann Stolper Edward M. Stolper Edward M. "The abundance and hydrogen isotopic composition of water in SNC meteorites : implications for water on Mars /." Diss., Pasadena, Calif. : California Institute of Technology, 1995. http://resolver.caltech.edu/CaltechETD:etd-11062007-091745.

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4

Murray, Andrew P. "Factors controlling the abundance and carbon isotopic composition of land-plant derived compounds in crude oils." Curtin University of Technology, Centre for Petroleum and Environmental Organic Geochemistry, 1998. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=10771.

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This thesis describes a study in petroleum geochemistry and specifically of the application of Land-plant derived hydrocarbons to elucidating source matter type, depositional environment and thermal maturity of crude oils. Large volumes of petroleum have been generated from land-plant organic matter in many parts of the world, but especially in the Tertiary deltaic provinces of the USA, Canada, Africa, Southeast Asia, Australia and New Zealand. Compared to oils from other regions, these oils have a relatively complex pattern of biomarkers or molecular fossils, a feature reflecting the diversit

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5

Green, Lisa Carol. "Fast atom bombardment mass spectra of pyrylium and pyridinium salts : the study of isotopic abundance ratios in various sputtering matrices." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/27441.

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6

Woolf, Vincent Martell. "Mercury elemental and isotopic abundances in mercury-manganese stars /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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7

Sands, Daphne G. "Lunar neutron energy spectra from isotope abundance measurements on cadmium, samarium and gadolinium." Thesis, Curtin University, 1998. http://hdl.handle.net/20.500.11937/803.

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This thesis provides new evidence which contributes to a clearer understanding of the mixing history of the lunar soil, the interactions of cosmic rays with the lunar surface and any temporal and spatial variations in cosmic ray intensity at the lunar surface. The bombardment of the lunar surface by cosmic rays produces secondary neutrons which are thermalised by the lunar soil. These thermal neutrons are captured by trace elements with large neutron capture cross sections such as cadmium, gadolinium and samarium. Measurements by thermal ionisation mass spectrometry of the changes in the isoto

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8

Szigeti, László, Szabolcs Mészáros, Verne V. Smith, et al. "12C/13C isotopic ratios in red-giant stars of the open cluster NGC 6791." OXFORD UNIV PRESS, 2018. http://hdl.handle.net/10150/627135.

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Carbon isotope ratios, along with carbon and nitrogen abundances, are derived in a sample of 11 red-giant members of one of the most metal-rich clusters in the Milky Way, NGC 6791. The selected red-giants have a mean metallicity and standard deviation of [Fe/H] = +0.39 +/- 0.06 (Cunha et al. 2015). We used high-resolution H-band spectra obtained by the SDSS-IV Apache Point Observatory Galactic Evolution Experiment. The advantage of using high-resolution spectra in the H band is that lines of CO are well represented and their line profiles are sensitive to the variation of C-12/C-13. Values of

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9

Szymanski, A. "Absolute gamma-ray abundances of light rhenium and tungsten isotopes." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376142.

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10

Sands, Daphne G. "Lunar neutron energy spectra from isotope abundance measurements on cadmium, samarium and gadolinium." Curtin University of Technology, School of Physical Sciences, 1998. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=9486.

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This thesis provides new evidence which contributes to a clearer understanding of the mixing history of the lunar soil, the interactions of cosmic rays with the lunar surface and any temporal and spatial variations in cosmic ray intensity at the lunar surface. The bombardment of the lunar surface by cosmic rays produces secondary neutrons which are thermalised by the lunar soil. These thermal neutrons are captured by trace elements with large neutron capture cross sections such as cadmium, gadolinium and samarium. Measurements by thermal ionisation mass spectrometry of the changes in the isoto

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11

Halfen, D. T., N. J. Woolf, and L. M. Ziurys. "The 12C/ 13C Ratio in Sgr B2(N): Constraints for Galactic Chemical Evolution and Isotopic Chemistry." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/625777.

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A study has been conducted of 12C/13C ratios in five complex molecules in the Galactic center. H2CS, CH3CCH, NH2CHO, CH2CHCN, and CH3CH2CN and their 13C-substituted species have been observed in numerous transitions at 1, 2, and 3 mm, acquired in a spectral-line survey of Sgr B2(N), conducted with the telescopes of the Arizona Radio Observatory (ARO). Between 22 and 54 individual, unblended lines for the 12C species and 2–54 for 13C-substituted analogs were modeled in a global radiative transfer analysis. All five molecules were found to consistently exhibit two velocity components near V

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12

Wilson, J. M. "Natural abundance of '1'5N in soils : temporal and spatial variation in organic and inorganic N pools." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265428.

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13

Weber, Amy M. "Assessment of Nutritional Subsidies to Freshwater Mussels Using a Multiple Natural Abundance Isotope Approach." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1420715871.

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14

Evans, Thomas M. "Assessing Food and Nutritional Resources of Native and Invasive Lamprey Larvae Using Natural Abundance Isotopes." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343410278.

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15

Tozer, Wade Colin. "Nitrogen Isotope Variation in the Environment: Implications for Interpretation." The University of Waikato, 2006. http://hdl.handle.net/10289/2558.

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Natural abundance of 15N varies greatly and unpredictably within and between environments. The 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 provide a tool to investigate and illuminate ecosystem N cycling processes. Identifying and quantifying the sources of isotopic variation must precede any significant advance in the application of this techniqu

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16

Neilson, Roy. "Trophic inter-relationships between soil invertebrates and plants investigated using stable isotope natural abundances." Thesis, University of Dundee, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327546.

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17

Ni, Yunyan. "Evaluation of boron isotopes and trace element abundances in planktonic foraminifers as palaeo-oceanographic proxies." Thesis, University of Bristol, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431620.

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18

Kusler, Jennifer, and Jennifer Kusler. "A 7500-Year Paleolimnological Record of Environmental Change and Salmon Abundance in the Oregon Coast Range." Thesis, University of Oregon, 2012. http://hdl.handle.net/1794/12413.

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19

Turner, Justin Marriner 1952. "Assessment of the seasonal fluctuations in relative isotopic abundances of oxygen-18 and deuterium in rain water from the Tucson Basin, Arizona." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/191903.

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Rainfall in the Tucson Basin, located in southeastern Arizona, averages about 30 centimeters annually and is distributed unevenly between the summer and winter rainy seasons. Additionally, both the source of water vapor and the meteorological conditions differ during summer and winter storms. Previous investigations in the Tucson Basin and elsewhere have noted seasonal variations in the relative isotopic abundance ratios of oxygen-18 and deuterium and have attributed this variation in part to the meteorological conditions that prevailed during each storm. The purpose of this study was to use s

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20

Hamilton, Bryan T. "Small Mammals in portions of Great Basin National Park Susceptible to Groundwater Withdrawal: Diversity and Stable Isotope Perspectives." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1705.

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To support population growth in Las Vegas, Nevada, large scale increases in groundwater pumping are planned across the state. This pumping could affect riparian areas in Great Basin National Park by lowering groundwater levels, reducing stream flows, and xerifying riparian vegetation. Great Basin National Park (GBNP) is mandated to manage its resources unimpaired for future generations. Loss of biodiversity is unacceptable under this mandate. If groundwater levels are reduced beyond a threshold, aquatic and riparian diversity would be lost, but the effects on small mammal communities are less

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21

Lochner, Chris (Christopher G. ). Carleton University Dissertation Earth Sciences. "Pb isotopes and abundances in vertical profiles of glacial till, Halfmile Lake VMS deposit, Bathurst Camp, New Brunswick." Ottawa, 1996.

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22

Maskenskaya, Olga M. "Abundance and fractionation of rare earth elements in calcite and other secondary minerals in fractures in the upper kilometre of crystalline bedrock, SE Sweden." Doctoral thesis, Linnéuniversitetet, Institutionen för biologi och miljö (BOM), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-37547.

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This thesis focuses on the geochemistry of secondary minerals, mainly calcite but also others such as fluorite and Ca/Al silicates, precipitated throughout the last 1.5 billion years in fractures of crystalline rock, SE Sweden. The work was based on previous reconnaissance studies and has been possible thanks to access to high-quality drill cores and associated mapping data provided by the Swedish Nuclear Fuel and Waste Management Co (SKB). Concentrations of rare earth elements (REEs) and occasionally other metals were determined in a variety of secondary minerals from fractures (mainly open s

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23

van, Dijk Jeroen. "Size and Abundance of Late Pleistocene Reticulofenestrid Coccoliths from the Eastern Indian Ocean in Relation to Temperature and Aridity." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-325273.

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Measurements on coccolith abundance and mass can be used as a signal of primary productivity and pelagic calcification in response to environmental change. The Leeuwin Current (LC) is known to transport warm and low-salinity waters from the Indo-Pacific Warm Pool (IPWP) southwards along the coast of West Australia. Along with the onset of continental aridity during late Neogene, increased strength of the LC may have played a role in reef expansion on the Northwest Shelf. In this study the morphological variation in size and mass of reticulofenestrid coccoliths was assessed in material from IOD

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24

Kheir, Beik Louay. "Dynamics of soil organic matter amino acids : a carbon isotope approach." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0098.

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Cette thèse aborde un point clé du couplage entre ces cycles: la dynamique des molécules azotées (AAs) des matières organiques du sol (MOS). Par des expériences d'incubation, nous avons estimé que les flux de biosynthèse des AAs par les micro-organismes du sol lors du processus de décomposition sont de l'ordre de 25% de la biomasse nouvellement formée. Le profil des AAs individuels biosynthétisés de novo est plus dépendant du type de sol que de la nature du substrat. Dans chaque sol, il est très similaire à celui des AAs des MOS. La biodégradation de matériaux végétaux marqués en 13C a révélé

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25

Comstedt, Daniel. "Explaining temporal variations in soil respiration rates and delta¹³C in coniferous forest ecosystems." Doctoral thesis, Örebro University, Institutionen för naturvetenskap Department of Natural Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-2055.

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<p>Soils of Northern Hemisphere forests contain a large part of the global terrestrial carbon (C) pool. Even small changes in this pool can have large impact on atmospheric [CO2] and the global climate. Soil respiration is the largest terrestrial C flux to the atmosphere and can be divided into autotrophic (from roots, mycorrhizal hyphae and associated microbes) and heterotrophic (from decomposers of organic material) respiration. It is therefore crucial to establish how the two components will respond to changing environmental factors. In this thesis I studied the effect of elevated atmospher

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26

Comstedt, Daniel. "Explaining temporal variations in soil respiration rates and delta13C in coniferous forest ecosystems." Doctoral thesis, Örebro universitet, Institutionen för naturvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-2055.

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Soils of Northern Hemisphere forests contain a large part of the global terrestrial carbon (C) pool. Even small changes in this pool can have large impact on atmospheric [CO2] and the global climate. Soil respiration is the largest terrestrial C flux to the atmosphere and can be divided into autotrophic (from roots, mycorrhizal hyphae and associated microbes) and heterotrophic (from decomposers of organic material) respiration. It is therefore crucial to establish how the two components will respond to changing environmental factors. In this thesis I studied the effect of elevated atmospheric

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27

Ogonowski, Martin. "Studies on Baltic Sea mysids." Doctoral thesis, Stockholms universitet, Systemekologiska institutionen, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-75236.

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Mysid shrimps (Mysidacea, Crustacea) are efficient zooplanktivores in both marine and freshwater systems as well as lipid rich prey for many species of fish. Although some efforts have been made to study the role of mysids in the Baltic Sea, very few studies have been carried out in recent time and there are still knowledge gaps regarding various aspects of mysid ecology. This thesis aims to explore some of these gaps by covering a mixture of topics. Using multifrequency hydroacoustics we explored the possibility to separate mysids from fish echoes and successfully established a promising and

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28

Landry, Mantha Olivier. "Une nouvelle approche d’isotopomique pour identifier les dysrégulations du métabolisme des protéines et des acides aminés lors du développement du syndrome métabolique." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLA009/document.

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Si les différentes composantes du syndrome métabolique (SM) sont susceptibles d’affecter le métabolisme protéique et des acides aminés (AA), les données disponibles sont peu nombreuses et souvent contradictoires, du fait de l’hétérogénéité de présentation de ce syndrome et des limites des approches classiques d’investigation du métabolisme azoté. Ce travail de thèse met à profit une nouvelle approche isotopomique, s’appuyant sur la mesure de l’abondance naturelle des isotopes stables de l’azote (δ15N) et du carbone (δ13C) dans les protéines et AA tissulaires pour identifier les altérations du

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29

Poupin, Nathalie. "Les abondances naturelles des isotopes stables de l'azote chez le rat : facteurs de variabilité et application pour l'étude des flux azotés et de l'impact métabolique de conditions nutritionnelles et physiopathologiques par modélisation compartimentale." Phd thesis, AgroParisTech, 2013. http://pastel.archives-ouvertes.fr/pastel-00927219.

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Les abondances relatives naturelles des différents isotopes stables de l'azote (δ15N) varient selon les tissus au sein d'un individu et selon les individus au sein d'une population, et ces différences reflètent à la fois les caractéristiques de structure et de fonctionnement du métabolisme azoté et ses modulations en lien avec des variations des conditions nutritionnelles et physio-pathologiques. Cette thèse vise, à travers une approche couplée d'expérimentation et de modélisation, à mieux caractériser et comprendre les modulations des δ15N des différents pools azotés et à démontrer la capacit

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30

Yong, David C. Lambert David L. "Isotopic abundance analysis of field and cluster stars." 2004. http://wwwlib.umi.com/cr/utexas/fullcit?p3145826.

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31

Yong, David C. 1974. "Isotopic abundance analysis of field and cluster stars." 2004. http://hdl.handle.net/2152/12822.

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32

Scott, Patrick C. "CO Spectral Line Formation in the Sun: Convective Simulation, Line Profiles and Isotopic Abundance Measures." Thesis, 2004. http://hdl.handle.net/1885/42581.

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CO spectral line formation in the Sun was modelled using realistic, ab initio, timedependent 3D radiative-hydrodynamical model atmospheres. Three `phases' of 3D model atmospheres were utilised. In Phase 1, strong CO lines formed in very high atmospheric layers were modelled using the established model (Asplund et al. 2000b). This produced less than perfect agreement with observed line asymmetries measured in the ATMOS disc-centre solar atlas. The velocity, temperature and density fields were then manually altered during Phase 2 in order to ascertain the reasons for the disagreement with observ

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33

Leshin, Laurie Ann. "The abundance and hydrogen isotopic composition of water in SNC meteorites : implications for water on Mars." Thesis, 1995. https://thesis.library.caltech.edu/4424/1/Leshin_la_1995.pdf.

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NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The water in the current martian atmosphere contains [...] 5 times more deuterium (D) than water on Earth (corresponding to a [...] value of [...] +4000) resulting from preferential loss of hydrogen relative to deuterium from the martian atmosphere. This thesis places constraints on the D/H of other martian water reservoirs by measuring the D/H of water in hydrous phases within the SNC meteorites, thought to be samples of martian igneous rocks. Results from vacuum extraction

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34

Turner, Justin Marriner. "Assessment of the seasonal fluctuations in relative isotopic abundances of oxygen-18 and deuterium in rain water from the Tucson Basin, Arizona." 1986. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1986_491_sip1_w.pdf&type=application/pdf.

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35

Chen, Liang-Wei, and 陳良偉. "using natural abundances of stable carbon and nitrogen isotopes to construct food webs in the Chijiwan Stream." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/05687765111735643337.

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碩士<br>中興大學<br>土壤環境科學系所<br>98<br>To construct the food webs in the the Chijiwan Stream, C and N stable isotope of the dominant aquatic insects, periphytons, riparian vegetations, fine particular organic matter, and the Oncorhynchus masou formosanus were analyzed during two wet seasons ( Jul 2007 ~ Aug 2007 and 2008 ) and one dry one ( Dec 2006 ~ Feb 2007 ). The C stable isotope analyses indicated C3 riparian vegetation had the lightest ratio ( -34.4 ~ -26.2 ‰ ), and C4 riparian vegetation was the heaviest one ( -14.8 ~ -12.5 ‰ ) in all our samples. The N stable isotope analyses indicated C3 rip

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36

"Extinct Radionuclides in the Early Solar System: The Initial Solar System Abundance of 60Fe from Angrites and Unequilibrated Ordinary Chondrites and 26Al-26Mg Chronology of Ungrouped Achondrites." Doctoral diss., 2012. http://hdl.handle.net/2286/R.I.15856.

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abstract: The presence of a number of extinct radionuclides in the early Solar System (SS) is known from geochemical and isotopic studies of meteorites and their components. The half-lives of these isotopes are short relative to the age of the SS, such that they have now decayed to undetectable levels. They can be inferred to exist in the early SS from the presence of their daughter nuclides in meteoritic materials that formed while they were still extant. The extinct radionuclides are particularly useful as fine-scale chronometers for events in the early SS. They can also be used to help cons

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37

Lording, William James. "A deeper understanding of the Diels–Alder reaction." Phd thesis, 2010. http://hdl.handle.net/1885/11776.

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The Diels-Alder reaction was discovered in 1928 and has become the most efficient and practical method for the synthesis of six-membered carbocyclic and heterocyclic rings. This thesis comprises three chapters of results and discussion with the Diels-Alder reaction as a theme. Chapter 2 details an investigation of endo:exo selectivity in the Diels-Alder reactions of 1,3-butadiene. Chapter 3 explores aspects of the intramolecular Diels-Alder reactions of some substituted 1,3,8-nonatrienes, and Chapter 4 describes the domino Diels-Alder reactions of 1,4-diiodo-1,3-butadiene. The Diels-Ald

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38

Cooper, Frances G. "Carbon-isotope abundances of alkenones from sediments of the Peru margin a potential oceanic carbon dioxide concentration proxy and El Niño indicator /." 1995. http://catalog.hathitrust.org/api/volumes/oclc/40325579.html.

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39

Jicha, Brian R. "Variable impact of the subducted slab on Aleutian Island arc magma sources evidence from Sr, Nd, Pb and Hf isotopes and trace elements abundances /." 2002. http://catalog.hathitrust.org/api/volumes/oclc/51556334.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 2002.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 29-41).

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40

Preiß, Katja [Verfasser]. "Investigating the ecology of partial and full myco-heterotrophy among Orchidaceae and Ericaceae using the stable isotope natural abundance analysis approach / vorgelegt von Katja Preiß, geb. Zimmer." 2009. http://d-nb.info/998931497/34.

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