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  • 1
    Electronic Resource
    Electronic Resource
    Formation of methylmercaptan and dimethylsulfide from methoxylated aromatic compounds in anoxic marine and fresh water sediments (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 7 (1990), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.1990.tb01696.x
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of methylmercaptan and dimethylsulfide from methoxylated aromatic compounds in anoxic marine and fresh water sediments (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 74 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Anaerobic formation of dimethylsulfide (DMS) and methylmercaptan (MSH) in anoxic sulfide-containing slurries from marine and fresh water sediments was stimulated by addition of syringate (4-hydroxy,3,5,-dimethoxybenzoate) and 3,4,5,-trimethoxybenzoate. The release of DMS and MSH occurred during the consumption of the aromatic monomers and ceased after their depletion. DMS was the dominant methylated sulfur compound in fresh water sediments, in contrast to marine sediments where MSH was predominant. No production of volatile organic sulfur compounds was observed in slurries containing gallate (3,4,5,-trihydroxybenzoate) or in autoclaved controled. About 50–65% of the methoxy carbon could be accounted for by peak accumulation of DMS and MSH. In the saline sediments, large amounts of CH4 were formed during the period when DMS and MSH disappeared. About 65–70% of the methylcarbon of the volatile methylated sulfur compounds (VMSC) could be accounted for in the produced CH4. This study demonstrates a previously unknown microbial process by which DMS and MSH are formed during anaerobic decomposition of methoxylated aromatic compounds in marine and freshwater sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb04076.x
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  • 3
    Electronic Resource
    Electronic Resource
    Desulfuromonas acetexigens sp. nov., a dissimilatory sulfur-reducing eubacterium from anoxic freshwater sediments (1994)
    Springer
    Archives of microbiology 161 (1994), S. 328-332 
    Details
    ISSN: 1432-072X
    Keywords: Desulfuromonas acetexigens (description) ; Reduction of elemental sulfur/polysulfide ; Anoxic freshwater mud ; Anaerobic acetate oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Five strains of obligate anaerobic sulfur-reducing eubacteria that exclusively use acetate as energy and carbon source have been enriched and isolated from anoxic sulfide-containing freshwater mud. The strains were unable to grow in the presence of 2% NaCl. Morphologically the strains were not uniform, cells were either rod-shaped or elongated ovoid. All strains were flagellated with a single polar to subpolar flagellum. They stained gram-negative. Two of the strains were studied in detail. Malate or fumarate was used alternatively to elemental sulfur as electron acceptor. The capacity to grow on acetate as sole organic substrate and to reduce elemental sulfur or polysulfide to sulfide are traits in common with the genus Desulfuromonas. The strains differ from Desulfuromonas acetoxidans by their freshwater origin, morphology, metabolic specialization and their DNA base ratio. Therefore we consider the new isolates as a new species for which the name Desulfuromonas acetexigens is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303588
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  • 4
    Electronic Resource
    Electronic Resource
    Desulfuromonas acetexigens sp. nov., a dissimilatory sulfur-reducing eubacterium from anoxic freshwater sediments (1994)
    Springer
    Archives of microbiology 161 (1994), S. 328-332 
    Details
    ISSN: 1432-072X
    Keywords: Key words:Desulfuromonas acetexigens (description) – Reduction of elemental sulfur/polysulfide – Anoxic freshwater mud – Anaerobic acetate oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Five strains of obligate anaerobic sulfur-reducing eubacteria that exclusively use acetate as energy and carbon source have been enriched and isolated from anoxic sulfide-containing freshwater mud. The strains were unable to grow in the presence of 2% NaCl. Morphologically the strains were not uniform, cells were either rod-shaped or elongated ovoid. All strains were flagellated with a single polar to subpolar flagellum. They stained gram-negative. Two of the strains were studied in detail. Malate or fumarate was used alternatively to elemental sulfur as electron acceptor. The capacity to grow on acetate as sole organic substrate and to reduce elemental sulfur or polysulfide to sulfide are traits in common with the genus Desulfuromonas. The strains differ from Desulfuromonas acetoxidans by their freshwater origin, morphology, metabolic specialization and their DNA base ratio. Therefore we consider the new isolates as a new species for which the name Desulfuromonas acetexigens is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303588
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  • 5
    Electronic Resource
    Electronic Resource
    Fermentation of methanethiol and dimethylsulfide by a newly isolated methanogenic bacterium (1992)
    Springer
    Archives of microbiology 157 (1992), S. 425-430 
    Details
    ISSN: 1432-072X
    Keywords: (Anaerobic degradation) ; C1-Compounds ; Methylated sulfur compounds ; Methane ; Methanogenic bacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract From dilution series in defined mineral medium, a marine iregular coccoid methanogenic bacterium (strain MTP4) was isolated that was able to grow on methanethiol as sole source of energy. The strain also grew on dimethylsulfide, mono-, di-, and trimethylamine, methanol and acetate. On formate the organism produced methane without significant growth. Optimal growth on MT, with doubling times of about 20 h, occurred at 30°C in marine medium. The isolate required p-aminobenzoate and a further not identified vitamin. Strain MTP4 had a high tolerance to hydrogen sulfide but was very sensitive to mechanical forces or addition of detergents such as Triton X-100 or sodium dodecylsulfate. Methanethiol was fermented by strain MTP4 according to the following equation: 1 $$\begin{array}{*{20}c} {4CH_3 SH + 3H_2 O \to 3CH_4 + HCO_3^ - } \\ { + 4HS^ - + 5H^ + } \\ {(\Delta G^{{\rm O}{\rm I}} = - 36.9kJ/MT)} \\ \end{array} $$ The growth yield was 3.06 g cell dry mass per mol of MT. During growth on MT the isolate released small amounts of DMS and, vice versa, degradation of DMS was accompanied by significant intermediate MT production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249099
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  • 6
    Electronic Resource
    Electronic Resource
    Formation of dimethylsulfide and methanethiol from methoxylated aromatic compounds and inorganic sulfide by newly isolated anaerobic bacteria (1992)
    Springer
    Archives of microbiology 157 (1992), S. 529-534 
    Details
    ISSN: 1432-072X
    Keywords: Methylated sulfur compounds ; 3,4,5-trimethoxybenzoate ; Syringic acid ; Pelobacter ; Acetobacterium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Formation of gas and of methylated sulfur compounds was observed in anaerobic enrichment cultures with methoxylated aromatic compounds as substrates. Via direct dilution of mud samples in defined reduced media supplemented with trimethoxybenzoate or syringate two new strains of anaerobic homoacetogenic bacteria (strain TMBS4 and strain SA2) were obtained in pure culture. Both strains produced dimethylsulfide and methanethiol during growth on methoxylated aromatic compounds. Growth tests and determination of stoichiometries demonstrated that the volatile sulfur compounds were formed from the methyl group at the aromatic ring and the sulfide added as reducing agent to the medium (R = aromatic residue): 2 R - O - CH3 + H2 S → 2 R - OH + (CH3)2S Dimethylsulfide was the major organic sulfur compound formed, whereas methanethiol appeared only as intermediate in small quantities. The isolates grew also with trihydroxybenzenes such as gallate, phloroglucinol, or pyrogallol without formation of methylated sulfur compounds. The aromatic compounds were degraded to acetate. The freshwater strain TMBS4 also fermented pyruvate. Other aliphatic or aromatic compounds were not utilized. External electron acceptors (sulfate, nitrate, fumarate) were not reduced. Both strains were mesophilic and formed rod-shaped, non-motile, Gram-negative cells. Spore formation was not observed. Tentatively, both isolates can be affiliated to the genus Pelobacter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276773
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  • 7
    Electronic Resource
    Electronic Resource
    Sulfite-oxido-reductase is involved in the oxidation of sulfite in Desulfocapsa sulfoexigens during disproportionation of thiosulfate and elemental sulfur (2003)
    Springer
    Biodegradation 14 (2003), S. 189-198 
    Details
    ISSN: 1572-9729
    Keywords: anaerobic ; disproportionation of elemental sulfur and thiosulfate ; enzyme studies ; pathway ; sulfite oxidoreductase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The enzymatic pathways of elemental sulfur and thiosulfate disproportionation were investigated using cell-free extract of Desulfocapsa sulfoexigens. Sulfite was observed to be an intermediate in the metabolism of both compounds. Two distinct pathways for the oxidation of sulfite have been identified. One pathway involves APS reductase and ATP sulfurylase and can be described as the reversion of the initial steps of the dissimilatory sulfate reduction pathway. The second pathway is the direct oxidation of sulfite to sulfate by sulfite oxidoreductase. This enzyme has not been reported from sulfate reducers before. Thiosulfate reductase, which cleaves thiosulfate into sulfite and sulfide, was only present in cell-free extract from thiosulfate disproportionating cultures. We propose that this enzyme catalyzes the first step in thiosulfate disproportionation. The initial step in sulfur disproportionation was not identified. Dissimilatory sulfite reductase was present in sulfur and thiosulfate disproportionating cultures. The metabolic function of this enzyme in relation to elemental sulfur or thiosulfate disproportionation was not identified. The presence of the uncouplers HQNO and CCCP in growing cultures had negative effects on both thiosulfate and sulfur disproportionation. CCCP totally inhibited sulfur disproportionation and reduced thiosulfate disproportionation by 80% compared to an unamended control. HQNO reduced thiosulfate disproportionation by 80% and sulfur disproportionation by 90%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1024255830925
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