Biological oxidation of sulfur compounds in artificially degraded wood

2019 ◽  
Vol 141 ◽  
pp. 62-70 ◽  
Author(s):  
Magdalena Albelda Berenguer ◽  
Mathilde Monachon ◽  
Clémentine Jacquet ◽  
Pilar Junier ◽  
Céline Rémazeilles ◽  
...  
Keyword(s):  
Sulfur Compounds ◽  
Biological Oxidation ◽  
Oxidation Of Sulfur Compounds

scholarly journals Reduction of Iron(III) Ions at Elevated Pressure by Acidophilic Microorganisms

2017 ◽  
Vol 262 ◽  
pp. 88-92 ◽  
Author(s):  
Rui Yong Zhang ◽  
Sabrina Hedrich ◽  
Axel Schippers
Keyword(s):  
High Pressure ◽  
Iron Reduction ◽  
Enrichment Culture ◽  
Elevated Pressure ◽  
Pressure Vessels ◽  
Ore Deposits ◽  
Sulfur Compounds ◽  
Cell Counting ◽  
Iron Cycling ◽  
Oxidation Of Sulfur Compounds

A composed mixed acidophilic, iron-oxidizing culture (FIGB) and a thermo-acidophilic enrichment culture (TK65) were used to evaluate microbial iron(III) reduction coupled to oxidation of reduced inorganic sulfur compounds (RISCs) under high pressure. Experiments were done in batch culture in high pressure vessels at 1 and 100 bar. Microbial abundance and activity were determined by measuring iron(II) concentration, direct cell counting, T-RFLP and quantitative real-time PCR. The data indicate that both cultures are able to reduce soluble iron(III) by oxidation of sulfur compounds under anaerobic conditions. At high pressure (100 bar) these acidophiles were capable of growing and microbial ferric iron reduction was only partially inhibited. These results indicate that acidophiles can be barotolerant and their activities are contributing to sulfur and iron cycling in anaerobic environments including deep ore deposits which is highly relevant for in situ leaching operations.

Mild and Selective Oxidation of Sulfur Compounds in Trifluoroethanol: Diphenyl Disulfide and Methyl Phenyl Sulfoxide

2003 ◽  
pp. 184-189 ◽  
Author(s):  
Kabayadi S. Ravikumar ◽  
Venkitasamy Kesavan ◽  
Benoit Crousse ◽  
Danièle Bonnet-Delpon ◽  
Jean-Pierre Bégué
Keyword(s):  
Selective Oxidation ◽  
Sulfur Compounds ◽  
Diphenyl Disulfide ◽  
Oxidation Of Sulfur Compounds ◽  
Methyl Phenyl

Gold nanoparticles supported on modified red mud for biphasic oxidation of sulfur compounds: A synergistic effect

2015 ◽  
Vol 162 ◽  
pp. 475-482 ◽  
Author(s):  
Aline A.S. Oliveira ◽  
Demétrio A.S. Costa ◽  
Ivo F. Teixeira ◽  
Flávia C.C. Moura
Keyword(s):  
Gold Nanoparticles ◽  
Synergistic Effect ◽  
Red Mud ◽  
Sulfur Compounds ◽  
Oxidation Of Sulfur Compounds

Oxidation of inorganic sulfur compounds: Chemical and enzymatic reactions

1999 ◽  
Vol 45 (2) ◽  
pp. 97-105 ◽  
Author(s):  
Isamu Suzuki
Keyword(s):  
Sulfur Oxidation ◽  
Chemical Oxidation ◽  
Sulfur Compounds ◽  
Enzymatic Oxidation ◽  
Enzymatic Reactions ◽  
Oxidation Reactions ◽  
Microbial Oxidation ◽  
Inorganic Sulfur ◽  
Nucleophilic Cleavage ◽  
Oxidation Of Sulfur Compounds

Microbial oxidation of inorganic sulfur compounds is governed by both chemical and enzymatic reactions. It is therefore essential to understand reactions possible in chemistry when we consider enzymatic reactions. Various oxidation states of sulfur atoms in inorganic sulfur compounds and chemical oxidation reactions as well as nucleophilic cleavage of sulfur-sulfur bonds are discussed. The scheme of enzymatic oxidation of sulfur compounds with S2-→> S0→> SO32-→> SO42-as the main oxidation pathway is discussed with thiosulfate and polythionates leading into the main pathway for complete oxidation to sulfate. Enzymatic reactions are related to chemical reactions and the use of inhibitors for S0→> SO32-and SO32-→> SO42-is discussed for analyzing and establishing reaction stoichiometries. The proposed pathway is supported by a variety of evidence in many different microorganisms including some genetic evidence if the oxidation steps include all the systems irrespective of oxidizing agents (O2, Fe3+, cytochromes etc.).Key words: sulfur, oxidation, chemical, enzymatic, reactions.

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