Results 251 to 260 of about 715,652 (297)

Sulfate Reduction in Marine Sediments

2000
The present chapter deals with the biogeochemical transformations of sulfur within marine sediments during early diagenesis. The term ‘early diagenesis’ refers to the whole range of postdepositional processes that take place in aquatic sediments coupled either directly or indirectly to the degradation of organic matter.
Kasten, S., Jørgensen, B.
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Sulfate reduction in Lake Agmon, Israel

The Science of The Total Environment, 2001
Lake Agmon, a newly reflooded water body in the southern part of the Hula valley is characterized by a clear phase period in winter with almost no blooms of phytoplankton. Dense macrobenthos and algal blooms form in the lake during summer and autumn. High primary production and chlorophyll-a concentrations were measured in April and during the summer ...
O, Hadas, R, Pinkas, N, Malinsky-Rushansky, D, Markel, B, Lazar   +4 more
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A kinetic study on bacterial sulfate reduction

Bioprocess and Biosystems Engineering, 2013
The activity of anaerobic sulfate reduction was studied using sulfate-reducing bacteria isolated from the water produced from a Brazilian oil reservoir. The effects of the initial sulfate concentration on the anaerobic sulfate reduction and sulfide generation kinetics were investigated. The redox potential, the biomass solution content, and the sulfate
L A, Bernardez, L R P, de Andrade Lima, E B, de Jesus, C L S, Ramos, P F, Almeida   +4 more
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Assimilatory Sulfate Reduction

1981
The roles of sulfur and nitrogen in cell nutrition show many similarities. Both must be reduced by living systems to form proteins and other macromolecules and both, therefore, appear among the macroelements required by plants and plant-like microorganisms.
J. A. Schiff, H. Fankhauser
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Reduction of chromate in cement by iron sulfate

Contact Dermatitis, 1979
Cement dermatitis is connected with chromate sensitivity. It can therefore be expected that “elimination” of chromate in cement would decrease the number of cases of cement dermatitis.Iron sulfate added to cement reduces the chromate completely and the 3‐valcnl chromium is precipitated. An amount of 0.35 % (w/w) iron sulfate, FeSO4.
S, Fregert, B, Gruvberger, E, Sandahl
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Aerobic Sulfate Reduction in Microbial Mats

Science, 1991
Measurements of bacterial sulfate reduction and dissolved oxygen (O 2 ) in hypersaline bacterial mats from Baja California, Mexico, revealed that sulfate reduction occurred consistently within the well-oxygenated photosynthetic zone of the mats.
D E, Canfield, D J, Des Marais
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Reduction of molybdate by sulfate-reducing bacteria

BioMetals, 2009
Molybdate is an essential trace element required by biological systems including the anaerobic sulfate-reducing bacteria (SRB); however, detrimental consequences may occur if molybdate is present in high concentrations in the environment. While molybdate is a structural analog of sulfate and inhibits sulfate respiration of SRB, little information is ...
Keka C, Biswas, Nicole A, Woodards, Huifang, Xu, Larry L, Barton   +3 more
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Direct reduction of sulfates to sulfate dioxide for isotopic analysis

Analytical Chemistry, 1978
Direct Reduction of Sulfates to Sulfur Dioxide for Isotopic Analysis I/sub n/ a previously published method, sulfur dioxide for isotopic analysis was prepared from barium sulfate by thermal decomposition. System has been modified by the addition of a furnace with copper turnings at 600/sup 0/C. The sulfate is mixed with cuprous oxide and silica, system
Max L. Coleman, Michael P. Moore
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Sulfate reduction in deep-sea sediments

American Journal of Science, 1991
Sulfate reduction rates calculated from about 200 DSDP pore water sulfate profiles have been contoured and plotted on a map covering most areas of the world ocean. Rates show a remarkable spatial consistency, with high rates observed near the continental margins, becoming progressively lower toward the central ocean basins.
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Thermochemical Sulfate Reduction

1997
Abstract This paper will explore the significance of thermochemical sulfate reduction (TSR) to the origin of sediment-hosted disseminated gold (SHDG) deposits. TSR provides a means of generating abnormally high concentrations of H2S at moderate temperatures (e.g., 100 to 200°C).
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