Results 271 to 280 of about 3,866,964 (327)
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1980
The geochemistry of sulfur is to a great extent affected by the biosphere. Living organisms transform sulfur from one oxidation state to another, thus changing the chemical properties of sulfur compounds and their distribution in the atmosphere, soils, waters and sediments.
A. J. B. Zehnder, S. H. Zinder
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The geochemistry of sulfur is to a great extent affected by the biosphere. Living organisms transform sulfur from one oxidation state to another, thus changing the chemical properties of sulfur compounds and their distribution in the atmosphere, soils, waters and sediments.
A. J. B. Zehnder, S. H. Zinder
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Sulfuric Acid on Europa and the Radiolytic Sulfur Cycle
Science, 1999A comparison of laboratory spectra with Galileo data indicates that hydrated sulfuric acid is present and is a major component of Europa's surface. In addition, this moon's visually dark surface material, which spatially correlates with the sulfuric acid concentration, is identified as radiolytically altered sulfur polymers.
R W, Carlson +2 more
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2005
Publisher Summary The chapter discusses the biologically mediated sulfur metabolisms, which involve the reduction of sulfur compounds, the oxidative processes, and the disproportionation of sulfur compounds. Sulfur is an essential nutrient element and constitutes around 0.5 to 1.0% of the dry weight of prokaryotic organisms.
Donald E. Canfield +2 more
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Publisher Summary The chapter discusses the biologically mediated sulfur metabolisms, which involve the reduction of sulfur compounds, the oxidative processes, and the disproportionation of sulfur compounds. Sulfur is an essential nutrient element and constitutes around 0.5 to 1.0% of the dry weight of prokaryotic organisms.
Donald E. Canfield +2 more
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Water ResearchThe biogeochemical cycles of nitrogen (N) and sulfur (S) play important roles in sustaining the Earth's ecosystem. However, their potential coupling process and underlying mechanisms in the nature remain unclear. Through joint applications of river water'
Meng Jiang, Quanfa Zhang, Hao Jiang
exaly +2 more sources
Environmental Reviews, 2018
Dissimilatory nitrate reduction processes including denitrification, anaerobic ammonium oxidation (ANAMMOX), and dissimilatory nitrate reduction to ammonium (DNRA) are crucial nitrogen (N) cycling pathways in freshwater ecosystems.
Mingxin Zhu +4 more
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Dissimilatory nitrate reduction processes including denitrification, anaerobic ammonium oxidation (ANAMMOX), and dissimilatory nitrate reduction to ammonium (DNRA) are crucial nitrogen (N) cycling pathways in freshwater ecosystems.
Mingxin Zhu +4 more
semanticscholar +1 more source
2014
This chapter addresses both geochemical and biogenic sulfur cycling, including their tight interconnections. It presents the cycling of sulfur between the atmosphere and the marine hydrosphere. The cycling involves redox processes and both biogenic and abiotic methylation and demethylation of sulfur.
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This chapter addresses both geochemical and biogenic sulfur cycling, including their tight interconnections. It presents the cycling of sulfur between the atmosphere and the marine hydrosphere. The cycling involves redox processes and both biogenic and abiotic methylation and demethylation of sulfur.
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Water Research, 2018
The high volume of flowback water (FW) generated during shale gas exploitation is highly saline, and contains complex organics, iron, heavy metals, and sulfate, thereby posing a significant challenge for the environmental management of the unconventional
Xiaoting Zhang +4 more
semanticscholar +1 more source
The high volume of flowback water (FW) generated during shale gas exploitation is highly saline, and contains complex organics, iron, heavy metals, and sulfate, thereby posing a significant challenge for the environmental management of the unconventional
Xiaoting Zhang +4 more
semanticscholar +1 more source
2008
Microbes, especially bacteria, play an important role in oxidative and reductive cycle of sulfur. The oxidative part of the cycle is mediated by photosynthetic bacteria in the presence of light energy and chemosynthetic forms in the absence of light energy.
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Microbes, especially bacteria, play an important role in oxidative and reductive cycle of sulfur. The oxidative part of the cycle is mediated by photosynthetic bacteria in the presence of light energy and chemosynthetic forms in the absence of light energy.
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Biogeochemistry, 1984
Sulfur is essential for the production of certain amino acids in plants. As amino acid sulfur is the major form of sulfur in trees, there is a strong relationship between organic S and organic N in tree tissue. Sulfur deficiencies occur in parts of southeastern Australia and northwestern North America, remote from pollutant inputs.
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Sulfur is essential for the production of certain amino acids in plants. As amino acid sulfur is the major form of sulfur in trees, there is a strong relationship between organic S and organic N in tree tissue. Sulfur deficiencies occur in parts of southeastern Australia and northwestern North America, remote from pollutant inputs.
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