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Tesis sobre el tema "Stable isotopic tracing"

Autor: Grafiati

Publicado: 25 de mayo de 2024

Última modificación: 19 de julio de 2025

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1

Cousineau, Mélanie L. "Tracing Biogeochemical Processes Using Sulfur Stable Isotopes: Two Novel Applications." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/23714.

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Abstract Dissimilatory microbial sulfate reduction (MSR) The specific objectives of the study were to provide the first measurements of sulfur isotope fractionation associated with acidophilic sulfate reducing-microorganisms, and to examine whether pH influences sulfur fractionation during MSR. The fractionation associated with the strains investigated was comparable to that of neutrophilic strains with similar metabolisms (4-12‰), but varied with pH. Two fractionation regimes were identified: one regime is consistent with fractionation during exponential growth, while the other – not identifi

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2

Laycock, Adam John. "Stable isotope tracing of engineered nanoparticles." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/43853.

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Engineered nanoparticles (NPs) are increasingly being used in consumer products due to their novel properties. Consequently, concerns have been raised over the potential hazards that these materials may present as a result of their release into the natural environment. This has prompted numerous investigations into the environmental behavior, transport and fate of engineered NPs. Importantly the predicted environmental concentrations of these materials is often x10 to x100 lower than the natural background levels of the element. Many studies overcome this problem with the use of high dosing co

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3

Bel, Jérémie. "Biodisponibilité du calcium, magnésium et potassium dans les sols forestiers : Quantification, traçage et caractérisation des sources biodisponibles par dilution isotopique stable (⁴⁴Ca, ²⁶Mg et ⁴¹K)." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0078.

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Les pools biodisponibles de calcium, magnésium et potassium sont considérés comme étant stocké dans les sols sous forme de cations échangeables adsorbés sur le complexe d’échange cationique et extractible avec une solution saline concentrée (e.g. NH₄⁺, Ba²⁺). Dans de nombreux écosystèmes forestiers, malgré des pools échangeables très faibles, les peuplements ne montrent aucun symptôme de carence pour ces cations nutritifs. Les discordances entre les différentes méthodes de diagnostic de la fertilité chimique du sol suggèrent que les arbres accèdent à des sources de nutriments non-quantifiés pa

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4

Sampaio, Leandro José Ribeiro Torres. "Tracing coastal organic enrichment: stable isotopes and biotic indices." Doctoral thesis, Universidade de Aveiro, 2010. http://hdl.handle.net/10773/975.

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Doutoramento em Biologia<br>Neste trabalho foi efectuada uma avaliação integrada usando descritores sedimentares e biológicos ao nível da espécie e da comunidade e índices bióticos de síntese para o traçamento do enriquecimento orgânico numa região, com características dispersivas, da costa Oeste de Portugal. Na área estudada existem gradientes ambientais e biológicos relacionados com a heterogeneidade da paisagem sedimentar, a qual inclui sedimentos desde areias finas limpas a vasas. Contudo, na área próxima do emissário, esta paisagem é mais homogénea e constituída por areia fina com baixo

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5

Daley, Timothy James. "Tracking holocene climate change using peat bog stable isotopes." Thesis, University of Southampton, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443040.

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6

Guiry, Eric. "Tracing colonial animal trade and husbandry using stable isotope analyses." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59276.

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Domestic animals, particularly cattle and pigs, were a cornerstone of European colonial projects around the globe (ca. 1500-1900 AD). Livestock husbandry and trade provided not only a source of food, labour, and raw materials for daily life, but also held symbolic significance as a factor in establishing colonial group identity. This dissertation uses stable isotope analyses to reconstruct domestic animal trade and husbandry practices associated with the global expansion of European colonial activities into the New World between the seventeenth and nineteenth centuries. Research has been divid

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7

Bristow, Laura Anne. "Tracing Nitrogen Flows Across the Southern North Sea : A Stable Isotope Approach." Thesis, University of East Anglia, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.514268.

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8

Larner, Fiona Claire. "Novel applications of stable isotope tracing methods in biomedical and environmental sciences." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/14768.

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The use of multiple-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) for trace element stable isotope ratio analysis has been well established within geochemistry since its conception. The utilization of this high precision technique has since progressed to some environmental applications; however, the use of this tool in biological and biomedical work is limited to few studies. The aim of this thesis is to establish viable techniques to enable high precision isotope analyses of Cu and Zn in biological media, and demonstrate these methods via several collaborative pilot studi

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9

Dethloff, Frederik. "In vivo 13C stable isotope tracing of single leaf development in the cold." Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2014/7048/.

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Measuring the metabolite profile of plants can be a strong phenotyping tool, but the changes of metabolite pool sizes are often difficult to interpret, not least because metabolite pool sizes may stay constant while carbon flows are altered and vice versa. Hence, measuring the carbon allocation of metabolites enables a better understanding of the metabolic phenotype. The main challenge of such 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 th

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10

Medini, Salim. "Traçage géographique des huiles d’olive par les isotopes du Sr : développement analytique et application aux huiles AOP de Nîmes." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4306/document.

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Depuis de nombreuses années, une approche a été mise en œuvre reposant sur l'identification de l'origine géographique d'un produit agro-alimentaire via la connaissance de ses isotopes du Sr, notamment via l'analyse du rapport 87Sr/86Sr. L'objectif de cette thèse est d'appliquer cette stratégie de reconnaissance aux huiles d'olive, en s'appuyant sur la production des huiles AOP de Nîmes dans le Sud de la France (Gard). La viscosité, la charge organique élevée, la teneur faible en Sr de cette matrice, rendent néanmoins inadaptés les protocoles de purification du Sr existants. La première approch

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11

Schollaen, Karina. "Tracking climate signals in tropical trees : new insights from Indonesian stable isotope records." Phd thesis, Universität Potsdam, 2014. http://opus.kobv.de/ubp/volltexte/2014/7194/.

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The tropical warm pool waters surrounding Indonesia are one of the equatorial heat and moisture sources that are considered as a driving force of the global climate system. The climate in Indonesia is dominated by the equatorial monsoon system, and has been linked to El Niño-Southern Oscillation (ENSO) events, which often result in severe droughts or floods over Indonesia with profound societal and economic impacts on the populations living in the world's fourth most populated country. The latest IPCC report states that ENSO will remain the dominant mode in the tropical Pacific with global eff

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12

Dickson, Luke. "Tracing Trophic Relationships of Insects in Cow Dung using Molecular and Stable Isotope Approaches." Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520202.

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13

Rude, Neil. "TRACING ENERGY FLOW PATHWAYS TO FISH USING FATTY ACIDS AND STABLE ISOTOPES OF HYDROGEN AND OXYGEN." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/937.

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Recent studies have demonstrated that use of stable carbon isotopes and fatty acid biomarkers in combination can be a powerful approach to elucidate trophic relationships in aquatic ecosystems. Stable hydrogen and oxygen isotope ratios of lipids and essential fatty acids in fishes may reflect environmental hydrogen and oxygen isotope signatures, enabling identification of the importance of floodplain lake and riverine energy sources for large river fishes. However, relationships between water and fish lipid or fatty acid hydrogen and oxygen isotopes have not been examined. Therefore, I eval

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14

Dean, Susan. "Tracking sea lice : Lepeophtheirus salmonis, between host fish populations using stable carbon and nitrogen isotopes." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/31433.

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This study was undertaken to assess the use of carbon and nitrogen stable isotope analyses as methods to identify source host fish populations of sea lice, Lepeophtheirus salmonis. The delta carbon signatures of parasitic copepodid sea lice used to infect cultured Atlantic salmon in the laboratory were found to be statistically indistinguishable from the delta carbon signatures of blood (ANOVA, p = 1.000) and mucus (ANOVA, p = 0.430) sampled from the wild pink salmon population from which the sea lice originated. As a result, delta carbon signatures show potential as tools to track the m

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15

Xia, Bingbing. "The growth and application of thin films grown by Atomic Layer Deposition (ALD)." Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS576.

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Nous avons étudié les mécanismes de croissance du dépôt atomique couche par couche (ALD) de films minces de ZnO, TiO2, Al2O3 et HfO2, en particulier en utilisant le traçage isotopique stable en conjonction avec les techniques d'analyse par faisceau d'ions isotopiquement sensibles, à savoir, la Spectrométrie de rétrodiffusion de Rutherford (RBS), l’analyse de détection de recul élastique (ERDA) et l’analyse de réaction nucléaire (NRA). En utilisant des précurseurs ALD marqués au deutérium, isotope rare, nous distinguons l'origine des éléments bruts et des impuretés dans chacun des films - de l'

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16

Granneman, Jennifer E. "Evaluation of trace-metal and isotopic records as techniques for tracking lifetime movement patterns in fishes." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7675.

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The focus of this work was on the use of otolith microchemistry and fish eye lens chemical profiles to measure fish movement and provided indirect support for the use of otolith microchemistry to examine exposure to crude oil. Chapter 1 provides an introduction to the applications of otolith microchemistry and eye lens isotopic profiles. In the second chapter, which examined associations between metal exposure and lesion formation in fishes collected after the Deepwater Horizon (DWH) oil spill, I did not observe any change in oil-associated metal concentrations in otoliths coinciding with th

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17

Dethloff, Frederik [Verfasser], and Lothar [Akademischer Betreuer] Willmitzer. "In vivo 13C stable isotope tracing of single leaf development in the cold / Frederik Dethloff. Betreuer: Lothar Willmitzer." Potsdam : Universitätsbibliothek der Universität Potsdam, 2014. http://d-nb.info/1051139058/34.

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18

Bothamy, Nina. "Fractionnement anthropique et naturel des isotopes stables du néodyme (Nd) dans l'environnement." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0295.

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Avec une utilisation mondiale croissante pour des applications variées (nouvelles technologies, énergies vertes, etc.), les terres rares (REEs pour ‘rare earth elements’) sont devenues des polluants émergents. Ces pollutions peuvent/pourront être d’origine industrielle (ex. rejets dans l’environnement en sortie d’usine), minière, ou causées par le stockage inapproprié de produits industriels (ex. aimants à base de néodyme (Nd) fragiles à la corrosion). Dans ce contexte, ce projet de thèse a cherché à développer un nouvel outil : l’étude du fractionnement dépendant de la masse des isotopes du N

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19

Lim, Katie Lian Hui. "Tracing the origin and fate of methane in waterlogged oxic soil using flux, biomarker and stable isotope probing methods." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.633102.

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Oxic soils are generally classed as a sink for atmospheric methane (CH4), as methanotrophy far outweighs internal production. However, CH4 production can be stimulated in such soils by exposure to wet conditions, or even cause them to act as a net CH4 source. The work detailed in this thesis was carried out with the aims of investigating the nature and distributions of the microbial communities controlling CH4 cycling in waterlogged aerobic soils, and assessing their potential to respond to marginal increases in soil moisture and aeration conditions caused by climate-change induced precipitati

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20

Schollaen, Karina [Verfasser], and Achim [Akademischer Betreuer] Brauer. "Tracking climate signals in tropical trees : new insights from Indonesian stable isotope records / Karina Schollaen. Betreuer: Achim Brauer." Potsdam : Universitätsbibliothek der Universität Potsdam, 2014. http://d-nb.info/1060257475/34.

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21

Holmgren, Bror. "Tracing the source of colourless carbon in an arctic lake on SW Greenland : Insights of organic matter origin from hydrogen isotope analyses of samples prepared using steam equilibration." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-121524.

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Lakes play an important role in the global carbon (C) cycle as they process carbon from terrestrial (allochthonous) and within lake (autochthonous) sources and may store C over long periods of time. Some arctic lakes contain high concentrations of dissolved organic carbon (DOC) that does not absorb light and thus remains colourless. The origin of this DOC remains unknown, but the sediment of these lakes have been suggested to accumulate primarily autochthonous (algal) C. I developed an experimental chamber for hydrogen (H) isotope pre-treatments and applied a novel H isotope tracing approach t

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22

Moorhouse, Arabella Mary Louise. "Tracing metals from sources to sinks in the Afon Clarach Catchment (Mid-Wales) using stable isotope and trace metal fingerprinting." Thesis, Aberystwyth University, 2010. http://hdl.handle.net/2160/f956e4ab-a01a-4108-a9ff-9a4a2c9a9e9c.

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The mineralisation which occurs within the Central Wales Orefield (CWO) is of historical importance, as the area was once one of the major producers of silver in the United Kingdom. In comparison to the other ore districts situated in the British Isles however, surprisingly little research has been undertaken in the CWO in recent years. This thesis redresses this issue by examining, in conjunction with Pb isotope analysis, the geochemical variation in three sulphide minerals (galena, sphalerite and chalcopyrite), collected from six mineralised lodes located in the Afon Clarach catchment; a sma

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23

Al-Reasi, Hassan Ali. "Tracking mercury biomagnification in fish from the Gulf of Oman using stable isotopes (carbon-13carbon-12 and nitrogen-15nitrogen-14)." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/26836.

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Attempts to use stable isotope carbon (delta13C) and nitrogen (delta15N) ratios to construct trophic positions and track mercury biomagnification in zooplankton and 13 fish species from a coastal food web of the Gulf of Oman illustrated some potential differences in this environment compared to the aquatic ecosystem of the northern hemisphere. Due to the large difference in delta13C values (3.4&permil;) between zooplankton planktivorous fish species (S. crumenophthalmus, S. longiceps and R. kanagurta), zooplankton would seem to not be the primary diet of these fish species as commonly describe

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24

Bertram, Sebastian [Verfasser], and Walter [Akademischer Betreuer] Michaelis. "Tracing carbon fluxes within two distinct microbial communities in anaerobically methane oxidising mats by stable isotope probing / Sebastian Bertram. Betreuer: Walter Michaelis." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2012. http://d-nb.info/1026332796/34.

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25

Bertram, Sebastian Verfasser], and Walter [Akademischer Betreuer] [Michaelis. "Tracing carbon fluxes within two distinct microbial communities in anaerobically methane oxidising mats by stable isotope probing / Sebastian Bertram. Betreuer: Walter Michaelis." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2012. http://d-nb.info/1026332796/34.

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26

Graham, Shannon C. "Analysis of the foraging ecology of hawksbill turtles (Eretmochelys imbricata) on Hawai'i Island : An investigation utilizing satellite tracking and stable isotopes. /." University of Hawai'i at Hilo, 2009. http://proquest.umi.com/pqdweb?did=1833468171&sid=2&Fmt=2&clientId=23658&RQT=309&VName=PQD.

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27

Trevis, Isaac Andrew. "Assessing and Tracking Nitrate Contamination from a Point Source and the Effects on the Groundwater Systems in Mid Canterbury, New Zealand." Thesis, University of Canterbury. Department of Geological Sciences, 2012. http://hdl.handle.net/10092/7603.

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Water is a valuable and crucial resource, the protection of which poses environmental, social and economic challenges. Fundamental to the sustainable use of water is effective management. In the Canterbury region of New Zealand, nitrate contamination has become a resource management issue due to changes in land use and intensification, which have placed pressure on the region’s groundwater and surface water systems. The purpose of this study was to assess and track nitrate concentrations on the Central Canterbury Plains with specific emphasis on a local point source of nitrate, the Ashburton

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28

Michael, Nathan. "The Influence of Diet and Foraging Behavior on Carotenoid Ornaments in the Brown Booby (Sula leucogaster)." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1607016789026865.

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29

Braig, Emanuel [Verfasser], Arnulf [Akademischer Betreuer] Melzer, and Christoph [Akademischer Betreuer] Mayr. "Stable isotopes of bioelements for tracing limnological key processes in the Osterseen lake district, Upper Bavaria / Emanuel Braig. Gutachter: Arnulf Melzer ; Christoph Mayr. Betreuer: Arnulf Melzer." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1073247929/34.

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30

Rosenblatt, Adam. "Factors Influencing Movements and Foraging Ecology of American Alligators (Alligator mississippiensis) in a Dynamic Subtropical Coastal Ecosystem." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/900.

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Top predators can have large effects on community and population dynamics but we still know relatively little about their roles in ecosystems and which biotic and abiotic factors potentially affect their behavioral patterns. Understanding the roles played by top predators is a pressing issue because many top predator populations around the world are declining rapidly yet we do not fully understand what the consequences of their potential extirpation could be for ecosystem structure and function. In addition, individual behavioral specialization is commonplace across many taxa, but studies of i

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31

Cheng, Li. "Elevated Atmospheric CO2 Impacts Carbon Dynamics in a C4-Sorghum-Soil Agroecosystem---An Application of Stable Carbon Isotopes (d13C) in Tracing the Fate of Carbon in the Atmosphere-Plant-Soil Ecosystem." Diss., Tucson, Arizona : University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1130%5F1%5Fm.pdf&type=application/pdf.

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32

Skinner, Aaron. "Using GPS-Tracking to Fill Knowledge Gaps in the Full Annual Cycle of an Elusive Aerial Insectivore in Steep Decline." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1626886599137179.

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33

Fromant, Aymeric. "The ecology and niche segregation of diving petrels." Thesis, La Rochelle, 2022. https://tel.archives-ouvertes.fr/tel-03959129.

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L'exploration de la niche écologique d'une espèce implique une analyse à plusieurs échelles, car différentes contraintes environnementales peuvent avoir des conséquences écologiques importantes. Cependant, l'absence d'informations précises sur l'écologie des petites espèces de procellariiformes a considérablement limité leur étude, impactant notre capacité à définir une planification de conservation appropriée. Les avancées technologiques dans la miniaturisation des enregistreurs de données permettent depuis peu de collecter des données écologiques sur ces espèces. Dans cette étude, une approc

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34

Roy, Chowdhury Taniya. "Tracking Carbon Flow during Methane Oxidation into Methanotrophs using 13C-PLFA Labeling in Pulsing Freshwater Wetlands." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1339084813.

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35

Sztukowski, Lisa Ann. "Foraging ecology of the Campbell Albatross : individual specialisation and fishery interactions." Thesis, University of Plymouth, 2016. http://hdl.handle.net/10026.1/5377.

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Most albatrosses are critically endangered, endangered or vulnerable due to the deleterious impact of fisheries, pollution, introduced species, habitat alteration, and climate change. Foraging behaviour influences many aspects of seabird biology, and a detailed understanding of foraging ecology is required to better predict the impacts of significant changes to the marine environment. Campbell Albatross (Thalassarche impavida) is a threatened endemic, confined to a small number of locations on Campbell Island, New Zealand and was recently split from the closely related Black-browed Albatross (

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36

Bouimouass, Houssne. "Characterizing groundwater recharge processes in a semiarid mountain-front using stable isotopes, hydrochemistry and heat as a tracer (Ourika basin, Tensift, Central Morocco) Groundwater recharge sources in the mountain-front Seasonality in intermittent streamflow losses beneath a semiarid wadi." Thesis, Avignon, 2021. http://www.theses.fr/2021AVIG0059.

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La recharge au niveau des piémonts constitue une source importante de recharge naturelle des eaux souterraines dans les zones arides et semi-aride. Le bassin du Tensift, au centre du Maroc, héberge la plaine du Haouz et l'aquifère alluvial du Haouz dont l'extension spatiale dépasse 6000 km². L'eau souterraine est la source d'eau principale pour les activités agricoles, industrielles et pour l'alimentation en eau potable Cette ressource st considérablement affectée par la surexploitation et le changement climatique. La détermination des sources et des processus de recharge, en particulier au ni

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37

Silva, Tiago José Caetano. "Mercury isotopic characterization in fish from aquitanian lakes: potential application on mercury source tracing." Master's thesis, 2017. http://hdl.handle.net/10451/35960.

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Trabalho Final de Mestrado Integrado, Ciências Farmacêuticas, Universidade de Lisboa, Faculdade de Farmácia, 2017<br>Mercury (Hg) is an ubiquitous contaminant with a severe impact in public health. In general, humans are mainly exposed to this metal due to fish and seafood consumption where high concentrations of this element can be found due to the bioaccumulation and biomagnification processes occurring in the water environments. A previous study driven by ANSES showed high mercury concentrations on fish from the Aquitanian lakes and this work integrates a new research program that aims at

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38

Fassbinder, Joel J. "Tracing the flow of carbon through ecosystems using stable isotope techniques /." Diss., 2010. http://purl.umn.edu/60696.

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39

Yang, I.-Hui Ou, and 歐陽翊暉. "Tracing of ketamine and gunpowder by carbon stable isotope ratio analysis." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/238zkw.

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碩士<br>中央警察大學<br>鑑識科學研究所<br>100<br>The purpose of this research is trying to use isotope ratio mass technique (IRMS) to trace the source of abused drugs and gunpowders. Abused drugs include anaesthetic, stimulant, hallucinogen and sedative material. This research focused on ketamine, which is one of the date rape pills. The amount of ketamine that ferreted out by police is increasing yearly. It indicated that ketamine was abused seriously, so it is important to trace the source of ketamine. It is illegal for a person to own or to sell a gun in Taiwan, but many gangsters possess guns secretly. T

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40

Di, Nunzio Giada. "Tracing Hepatic Glycogen and Lipid Metabolism with Stable Isotope Tracers: Insight From Murine Studies." Doctoral thesis, 2021. http://hdl.handle.net/10316/96427.

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Tese no âmbito do Doutoramento em Biologia Experimental e Biomedicina, ramo de Biotecnologia e Saúde, orientada pelo Doutor John G. Jones e coorientada pela Doutora Eugenia Carvalho e pelo Professor Doutor João Ramalho Santos, apresentada ao Instituto de Investigação Interdisciplinar da Universidade de Coimbra.<br>Humans evolved in environments where calorie supply and availability were scarce and unpredictable, thereby developing mechanisms that allowed them to store nutrients during times of plenty for utilization in times of need. In a remarkably short time, humanity has managed to profound

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41

Rempel, Marlin. "NO3- and N2O at the Strawberry Creek Catchment: tracing sources and processes using stable isotopes." Thesis, 2008. http://hdl.handle.net/10012/3899.

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Nitrate (NO3) contamination in agricultural watersheds is a widespread problem that threatens local drinking supplies and downstream ecology. Dual isotopes of NO3- (d15N and d18O) have been successfully used to identify sources of NO3 contamination and nitrogen (N)-cycle processes in agricultural settings. From 1998 to 2000, tile drainage and stream waters at the Strawberry Creek Catchment were sampled for NO3- concentration and isotopes. The results suggest that tile NO3 were mainly derived from soil organic matter and manure fertilizers, and that they were not extensively altered by denit

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42

Buda, Anthony R. "Tracing stream nitrate in a Central Pennsylvania mixed land-use basin using stable isotopes, bacteria, and inorganic chemicals." 2007. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2176/index.html.

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Short, Michael Anthony. "Tracing terrestrial salt cycling using chlorine and bromine." Phd thesis, 2017. http://hdl.handle.net/1885/133201.

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Understanding and quantifying terrestrial salt cycling is central to scientific fields such as sedimentary geology, mineral exploration, water resources, palaeontology, atmospheric chemistry and limnology. Dissolved chlorine and bromine concentrations have been utilised for decades as individual tracers or as a ratio to trace geochemical processes in saline environments. The stable isotope variations of these two elements have also been found to be useful for understanding and quantifying geochemical processes. However, both hydrogeochemical techniq

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44

Lee-Thorp, Julia A., J. Luyt, and M. B. Sponheimer. "Tracking changing environments using stable carbon isotopes in fossil tooth enamel: an example from the South African hominin sites." 2007. http://hdl.handle.net/10454/3432.

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No<br>The environmental contexts of the karstic hominin sites in South Africa have been established largely by means of faunal associations; taken together these data suggest a trend from relatively closed and more mesic to open, drier environments from about 3 to 1.5 Ma. Vrba argued for a major shift within this trend ca. 2.4¿2.6 Ma, an influential proposal that posited links between bovid (and hominin) radiation in Africa and the intensification of Northern Hemisphere Glaciation. Yet faunal approaches often rely on habitat and feeding preferences of modern taxa that may differ from those of

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45

Pack, Andreas [Verfasser]. "Tracing the origin of oxide inclusions in continuously casted steel using stable oxygen isotopes : aAn interdisciplinary approach / vorgelegt von Andreas Pack." 2000. http://d-nb.info/967277868/34.

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Dincer, Zeynep. "Tracking Oil from the Deepwater Horizon Oil Spill in Barataria Bay Sediments." Thesis, 2013. http://hdl.handle.net/1969.1/149405.

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In April 2010, approximately 4.9 million barrels of oil were accidentally released into the Gulf of Mexico during the Deepwater Horizon Macondo Mc252 Oil Spill. Some of the surface oil was carried by prevailing winds and currents and reached the coast of Louisiana impacting marsh and marine ecosystems. One and a half years after this incident, a set of oiled marsh samples (2 grab samples) coupled with nearby subtidal and intertidal cores (12 cores) were collected from Barataria Bay, Louisiana to determine the probable source of petroleum residues present and to characterize the chemical compo

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Martins, Beatriz Santos. "The effect of omega-3 supplementation on chick growth and foraging ecology of Cape Verde shearwater (Calonectris edwardsii)." Master's thesis, 2020. http://hdl.handle.net/10316/92277.

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Dissertação de Mestrado em Ecologia apresentada à Faculdade de Ciências e Tecnologia<br>Em geral, estudos no âmbito da ecologia de procura de alimento e da dieta de predadores focam-se essencialmente no estudo da quantidade de alimento, em vez da sua qualidade. Relativamente aos ácidos gordos presentes na dieta, estudos prévios sugerem que a sua qualidade é tão, ou mais, importante que a quantidade ingerida. Ácidos gordos são considerados nutrientes essenciais tendo em conta a sua importância para o normal funcionamento e desenvolvimento saudável dos indivíduos, ainda que estes compostos não s

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Lührs, Mia-Lana. "Social organisation and mating system of the fosa (Cryptoprocta ferox)." Doctoral thesis, 2012. http://hdl.handle.net/11858/00-1735-0000-000D-EF76-6.

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