Results 241 to 250 of about 4,448 (271)
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Chinese Journal of Geochemistry, 1993
The determined results of the sulfur contents and isotopic composition of coal samples from major coal mines in 15 provinces and regions of China show that the coal mined in the north of China is characterized by higher34S and lower sulfur content, but that in the south of China has lower34S and higher sulfur content. During the coal-burning process in
Yetang Hong, Hongbin Zhang, Yongxuan Zhu
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The determined results of the sulfur contents and isotopic composition of coal samples from major coal mines in 15 provinces and regions of China show that the coal mined in the north of China is characterized by higher34S and lower sulfur content, but that in the south of China has lower34S and higher sulfur content. During the coal-burning process in
Yetang Hong, Hongbin Zhang, Yongxuan Zhu
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Fractionation of sulfur isotopes during thiosulfate reduction by Desulfovibrio desulfuricans
Archives of Microbiology, 1998Sulfur isotope fractionation during reduction of thiosulfate was investigated with growing batch cultures of Desulfovibrio desulfuricans CSN (DSM 9104) at 30 degreesC. The sulfide produced was depleted in 34S by 10 per thousand as compared to total thiosulfate sulfur.
, Smock, , Bottcher, , Cypionka
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Sulfur chemistry and microbiological fractionation of sulfur isotopes in a saline Antarctic lake
Geomicrobiology Journal, 1979Data on temperature, water chemistry, and abundance of bacteria in Ace Lake, Antarctica are presented. In particular, the sulfur chemistry and microbiological fractionation of sulfur isotopes are discussed in relation to the possible development of the lake and the climatic history of the lake catchment.
H. R. Burton, R. J. Barker
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Fractionation of sulfur isotopes by continuous cultures of Desulfovibrio desulfuricans
Canadian Journal of Microbiology, 1975Sulfur isotope effects observed in lactate-limited continuous cultures of Desulfovibrio desulfuricans were, in general, similar to those reported for sulfate reduction by washed cells and batch cultures. There was a trend towards higher fractionation at low growth rates.
L A, Chambers +3 more
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Anomalous Fractionations of Sulfur Isotopes During Thermochemical Sulfate Reduction
Science, 2009Anomalously fractionated sulfur isotopes in many sedimentary rocks older than 2.4 billion years have been widely believed to be the products of ultraviolet photolysis of volcanic sulfur dioxide in an anoxic atmosphere. Our laboratory experiments have revealed that reduced-sulfur species produced by reactions between powders of amino acids ...
Yumiko, Watanabe +2 more
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Anomalous fractionation of sulfur isotopes during heterogeneous reactions
Earth and Planetary Science Letters, 2008Abstract Applying square adsorption-well and Morse potential models for the adsorption of a sulfur specie on a solid surface, we have evaluated the fractionation of four sulfur isotopes (32S, 33S, 34S and 36S) during chemisorption reactions. Heterogeneous reactions between solid and aqueous (or gaseous) species are found to produce anomalous ...
Antonio C. Lasaga +3 more
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Mikrobiologiia, 1977
Two processes of sulphur isotope fractionation have been found in experiments with the sulphur purple bacterium Ectothiorhodospira shaposhnikovii. As a result, a light isotope, 32S, is concentrated in residual hydrogen sulphide, and a heavy isotope, 34S, in elementary suphur which is deposited outside the cell.
M V, Ivanov +3 more
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Two processes of sulphur isotope fractionation have been found in experiments with the sulphur purple bacterium Ectothiorhodospira shaposhnikovii. As a result, a light isotope, 32S, is concentrated in residual hydrogen sulphide, and a heavy isotope, 34S, in elementary suphur which is deposited outside the cell.
M V, Ivanov +3 more
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Fractionation of sulfur isotopes by sediment adsorption of sulfate
Earth and Planetary Science Letters, 1974Abstract Adsorption studies with sediment from the Bay of Quinte (Lake Ontario) indicate that the adsorption isotherm for sulfate concentration greater than 20 mg/l can be described by a Langmuir-type equation. The accompanying changes in δ 34 S of the solutions range from +0.9 to +6.0‰ indicating enrichment of 32 S in the sediments.
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Fractionation of Stable Isotopes of Sulfur by Thiobacilli
Science, 1958I R, KAPLAN, T A, RAFTER
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Questions Regarding Precambrian Sulfur Isotope Fractionation
Science, 2001H, Ohmoto, K E, Yamaguchi, S, Ono
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