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Stable Hydrogen And Carbon Isotopic Compositions Of Biogenic Methanes, Roger Allen Burke Jr.
Stable Hydrogen And Carbon Isotopic Compositions Of Biogenic Methanes, Roger Allen Burke Jr.
USF Tampa Graduate Theses and Dissertations
Stable hydrogen and carbon isotopic compositions of biogenic methanes collected from the sediments of several deep-sea, nearshore marine-estuarine, and freshwater environments were determined. The isotopic compositions of methane samples from eight different DSDP Sites (mean σD-CH4 = -1850>/∞, std. dev. = 70>/∞, n = 75; mean σ13C-CH4 = -71.30/∞, std. dev. = 6.30/∞, n = 44) are generally typical of methane formed via C02 reduction in deep-sea sediments.
Methane collected from several freshwater environments was D-depleted (mean σD-CH4 = -3000>/∞ , std. dev. = …
Uptake Of Zn65 And Mn54 Into Body Tissues And Renal Granules By The Southern Quahog, Mercenaria Campechiensis, William Lynn Miller Jr.
Uptake Of Zn65 And Mn54 Into Body Tissues And Renal Granules By The Southern Quahog, Mercenaria Campechiensis, William Lynn Miller Jr.
USF Tampa Graduate Theses and Dissertations
A study was conducted to examine the influence of elevated inorganic phosphate and trace metal concentrations on the uptake and distribution of Zn65 and Mn54 into the body tissue and phosphoritic renal concretions of a subtropical estuarine bivalve, Mercenaria campechiensis. Chronological sampling of gills, mantle, adductor muscle, viscera, kidneys, and renal granules using gamma ray spectrometry allowed examination of both tissue distribution and accumulation patterns over time. The kidney was the principal site of Mn54 accumulation whereas Zn65 was concentrated in both the gill and the kidney. The gill initially accumulated zn65 three times faster …