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Now showing items 5743-5762 of 39124
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(2002)A fractal (power-law) distribution is the only statistical distribution applicable to a scale-invariant process. One of the major problems in petrology is the distribution of trace elements in the Earth's crust. Extreme ...
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(2004)The fractional composition of humic acids (HA) as stable Corg forms in the biosphere has been studied for soils of two types (chernozem and dernovo-podzolic) with different mechanisms of humus formation. Radiocarbon ages ...
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(2004)The Rymmen and Eriksberg gabbros preserve the crystallization products of hydrous basaltic liquids, ranging from anorthosite and troctolite to highly fractionated oxide gabbro, diorite, and leucotonalite. The high initial ...
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(2000)A critical review is reported of the crushing technique used for the extraction of the gas content from magmatic crystals. The main objective is the evaluation of the validity and accuracy of the method for obtaining data ...
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(2005)Atmospheric pollution effects on hydrogen fractionation in trees are demonstrated for the first time in this study. The δ2H ring-cellulose series obtained for black spruce trees at a site near a SO2-emitting smelter display ...
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(1999)Natural organic matter (NOM) consists of a complex mixture of organic molecules; previous studies have suggested that preferential sorption of higher molecular weight, more hydrophobic, and more aromatic components may ...
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(2003)Samples from the Kola Superdeep Drillhole (12 262 m), a deep drillhole (1060 m), and from the surface, seaprated by only around 10 km, provided a unique opportunity for direct tracing of delta13C and delta18O changes through ...
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(2003)Samples from the Kola Superdeep Drillhole (12 262 m), a deep drillhole (1060 m), and from the surface, seaprated by only around 10 km, provided a unique opportunity for direct tracing of delta(13)C and delta(18)O changes ...
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(2006)We examined stable carbon isotope fractionation in biosynthesis of fatty acids of a piezophilic bacterium Moritella japonica strain DSK1. The bacterium was grown to stationary phase at pressures of 0.1, 10, 20, and 50 MPa ...
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(2003)From experimental data in the systems Na2O-Al2O3-SiO2-H2O, K2O-Al2O3-SiO2-H2O at 1100°C, and CaO-Al2O3-SiO2-H2O at 1200°C in the 1-2 GPa pressure range, the solution behavior of the individual oxides in coexisting H2O-saturated ...
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(2001)The ratio of 18O/16O in atmospheric oxygen depends on the isotopic composition of the substrate water used in photosynthesis and on discrimination against 18O in respiratory consumption. The current understanding of the ...
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(2000)Reduction of selenium oxyanions by microorganisms is an important process in the biogeochemical cycling of selenium. Numerous bacteria can reduce Se oxyanions, which are used as electron acceptors during the oxidation of ...
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(1997)The fractionation of silicon isotopes by three species of marine diatoms, Skeletonema costatum, Thalassiosira weissflogii, and Thalassiosira sp., grown in batch culture, is reported. Fractionation was observed for all ...
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(1996)Air sampled from the moist unsaturated zone in a sand dune exhibits depletion in the heavy isotopes of N2 and O2. We propose that the depletion is caused by a diffusive flux of water vapor out of the dune, which sweeps out ...
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(2001)A numerical model of sulfate reduction and isotopic fractionation has been applied to pore fluid SO42- and δ34S data from four sites drilled during Ocean Drilling Program (ODP) Leg 168 in the Cascadia Basin at 48°N, where ...
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(2001)A neutron-activation study of 48 group-IVA irons shows much lower negative slopes on Ir-Au and Ir-As diagrams than observed in the larger magmatic group IIIAB. This difference seems to reflect the tendency of DIr, DAu and ...
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(2004)It is well known that in many cases rock permeability depends upon in situ stress conditions and on the pressure of the flowing fluid. Parallel and quasi-parallel joints represent one of the most often observed permeability ...
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(2001)Shear fracture propagation in rock is accompanied by localized microcracking in a process zone surrounding the fracture tip. We investigated the crack microstructures along experimentally formed shear fractures from four ...
Now showing items 5743-5762 of 39124