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搜索结果: 1-14 共查到理学 isotope composition相关记录14条 . 查询时间(0.156 秒)
The carbon isotope composition ( d13C) of C3/C4 mixed grassland is reflected in the d13C of diet, hair or faeces of grazers, if 13C discrimination (13 D) between grassland vegetation and these tissues...
Basalts from Logudoro, Sardinia (Italy), showing geochemical features similar to EM1-type mantle source, have been analyzed for their Li isotopic composition to provide data related to a heretofore u...
A temporal high-resolution analysis of Sr–Nd isotopic composition, Fe, Al and V concentration and magnetic susceptibility (MS) has been carried out in a sediment core from the western Bay of Bengal t...
Several processes may contribute to systematic downcore trends in δ13C of bulk Sphagnum peat. Whereas changes in water availability during C assimilation may change δ13C values in both a negative and ...
We determined the stable carbon isotope compositions (δ13C values) of perylene and compounds coexisting with it to elucidate the precursor of perylene in sediments of Lake Biwa. Although we found a hi...
We report the chemical composition of groundwaters—including the first data on the sulfur isotopic composition of dissolved sulfate—from the volcanic aquifers of Mt. Vulture, one of the most important...
The effect of auto- and heterotrophy on the carbon isotope composition (d13C) of fatty acids (FA) and sterols was studied in the scleractinian coralTurbinaria reniformis. Colonies were maintained in a...
This work explored the spatial variation of C3/C4 distribution in the Inner Mongolia, P. R. China, steppe by geostatistical analysis of carbon isotope data of vegetation and sheep wool. Standing commu...
The isotope composition of zinc (Zn) was determined in settling particles collected monthly over a year in the hypolimnion of the eutrophic Lake Greifen (Switzerland) in order to explore the potentia...
The utility of stable isotopes as tracers of the water molecule has a long pedigree. The study reported here is part of an attempt to establish a comprehensive isotopic "baseline" for the British Isle...
An understanding of the hydrological cycle in stable isotopic terms requires the characterisation of rainfall.
Atmospheric deposition of nitrogen and phosphorus on the central Baltic Sea (Baltic Proper) was estimated monthly at two coastal stations and two isolated islands in 2001 and 2002. Yearly nitrogen dep...
We report measurements of seasonal variability in the C-N stable isotope ratios of plants collected across the habitat mosaic of San Francisco Bay, its marshes, and its tributary river system. Analyse...
Abstract: Three samples of volcanic tuff were hydrothermally altered at ∼82°C in a soxhlet apparatus for periods from 745 to 2706 h. The samples correspond to partially altered specimens of volc...

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