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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 8 of 8 for “"Carbon Isotope Ratio"”.
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Precision measurement of carbon isotope ratio in exhaled breath for the detection of helicobacter pylori
… ulcers. In these tests, small changes in the ratio of stable CO<sub>2</sub> isotopomers, <sup>13</sup>CO<sub>2</sub> and <sup>12</sup>CO<sub>2</sub>, present in exhaled breath are measured precisely and this is conventionally done by using anIsotope Ratio Mass Spectrometer. However, the huge …
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Partitioning of multivariate phenotypes using regression trees reveals complex patterns of adaptation to climate across the range of black cottonwood (Populus trichocarpa)
… in temperate forest trees involves the integration of multiple physiological, morphological, and phenological traits. Latitudinal clines for the relevant component traits are frequently observed for species that have a north-south distribution, but these relationships do not account for …
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Genomic and Physiological Approaches to Improve Drought Tolerance in Soybean
… selection criteria in a breeding program. Carbon isotope ratio (δ13C, associated with water use efficiency), oxygen isotope ratio (δ18O, associated with transpiration), canopy temperature (CT), canopy wilting, and canopy coverage (CC) are promising physiological traits associated with …
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Biodegradation of Fuel Oxygenates in Northeastern United States Aquifers with an Analysis of Underground Storage Tank Leaks
… States were screened for lithology, MTBE concentration in ground water, monitoring well network location, and MTBE concentration trends. Ground water samples were collected from those sites that passed this initial screening phase. MTBE from the samples collected were analyzed using stable carbon …
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Genetics of Physiological Traits Associated with Drought Tolerance in Soybean (Glycine max)
… commercial soybean production. For example, carbon isotope ratio (δ13C) is positively correlated with water use efficiency (WUE), and nitrogen isotope ratio (δ15N) is negatively correlated with N2 fixation; canopy temperature (CT) is an indicator for genetic variation in transpiration and …
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Effect of reduced irrigation on grapevine physiology, grape characteristics and wine composition in three Pinot noir vineyards with contrasting soils
… in temperatures, wind speed and evapotranspiration, among other parameters were found within the region as well as between sites. A range of analyses was used to identify differences in grapevine physiology between vines under RI and those normally irrigated. Primary leaf area abscission and …
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Isotope ratios in source determination of formaldehyde emissions
… It is possible to distinguish the 13C/12C isotope ratio of UF resins from the isotope ratio of plant biomass. Conditions during and after composite hot-pressing promote reactions that generate formaldehyde from wood and UF resin, and the kinetic isotope effect continuously lowers the …
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The Potential of Bulk and Amino-Acid Specific Isotope Ratio Mass Spectrometry of Human Hair in Forensic and Clinical Applications
Isotope Ratio Mass Spectrometry (IRMS) is a specialized technique used to measure the isotopic ratios at natural abundance of the non-radioactive isotopes, and has proved to be a valuable tool in many applications. This research explores the use of IRMS of human hair for clinical and forensic …