Das gelbe Element und seine erstaunliche Vielseitigkeit

Steudel, Ralf

doi:10.1002/ciuz.19960300503

Cited by 28 publications

(30 citation statements)

References 24 publications

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“…In addition, elemental sulfur (flowers of sulfur) always contains some polymeric sulfur consisting of chainlike macromolecules, but the additional presence of large rings, S n (n>50), is very likely (Steudel & Eckert, 2003). The bonding energy of the S-S bonds in polymeric sulfur is 2.4 kJ mol 21 weaker than that in cyclo-octasulfur (Steudel et al, 1985;Steudel, 1996;Steudel & Eckert, 2003). Accordingly, polymeric sulfur, i.e.…”

Section: Introductionmentioning

confidence: 99%

Utilization of solid ‘elemental’ sulfur by the phototrophic purple sulfur bacterium Allochromatium vinosum: a sulfur K-edge X-ray absorption spectroscopy study

et al. 2007

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Section: Introductionmentioning

confidence: 99%

Utilization of solid ‘elemental’ sulfur by the phototrophic purple sulfur bacterium Allochromatium vinosum: a sulfur K-edge X-ray absorption spectroscopy study

et al. 2007

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“…As elemental sulfur is poorly soluble in water (Steudel, 1996), it has been proposed that an initial mobilization step is necessary prior to its uptake. Different hypotheses and experimental findings concerning this step have been published.…”

Section: Introductionmentioning

confidence: 99%

Unexpected extracellular and intracellular sulfur species during growth of Allochromatium vinosum with reduced sulfur compounds

et al. 2009

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Before its uptake and oxidation by purple sulfur bacteria, elemental sulfur probably first has to be mobilized. To obtain more insight into this mobilization process in the phototrophic purple sulfur bacterium Allochromatium vinosum, we used HPLC analysis and X-ray absorption near-edge structure (XANES) spectroscopy for the detection and identification of sulfur compounds in culture supernatants and bacterial cells. We intended to identify soluble sulfur compounds that specifically occur during growth on elemental sulfur, and therefore compared spectra of cultures grown on sulfur with those of cultures grown on sulfide or thiosulfate. While various unexpected oxidized organic sulfur species (sulfones, C–SO2–C, and sulfonates, ) were observed via XANES spectroscopy in the supernatants, we obtained evidence for the presence of monosulfane sulfonic acids inside the bacterial cells by HPLC analysis. The concentrations of the latter compounds showed a tight correlation with the content of intracellular sulfur, reaching their maximum when sulfur began to be oxidized. None of the detected sulfur compounds appeared to be a specific soluble intermediate or product of elemental sulfur mobilization. It therefore seems unlikely that mobilization of elemental sulfur by purple sulfur bacteria involves excretion of soluble sulfur-containing substances that would be able to act on substrate distant from the cells.

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“…For instance, if the sulfur is present in an unstable modification, it may be transformed e.g. into cyclooctasulfur, the thermodynamically most stable sulfur species at ambient temperature and pressure (Donohue, 1974 ;Steudel et al, 1990 ;Steudel, 1996). X-ray absorption near edge structure (XANES) spectroscopy at the sulfur K-edge using synchrotron radiation is an excellent tool to study the speciations of sulfur in biological samples (Rompel et al, 1998 ;Pickering et al, 1998 ;Prange et al, 1999Prange et al, , 2001).…”

Section: Introductionmentioning

confidence: 99%

Quantitative speciation of sulfur in bacterial sulfur globules: X-ray absorption spectroscopy reveals at least three different species of sulfur

et al. 2002

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X-ray absorption near edge structure (XANES) spectroscopy at the sulfur Kedge was applied to probe the speciation of sulfur of metabolically different sulfur-accumulating bacteria in situ. Fitting the spectra using a least-square fitting routine XANES reveals at least three different forms of sulfur in bacterial sulfur globules. Cyclooctasulfur dominates in the sulfur globules of Beggiatoa alba and the very recently described giant bacterium Thiomargarita namibiensis. A second type of sulfur globules is present in Acidithiobacillus ferrooxidans : here the sulfur occurs as polythionates. In contrast, in purple and green sulfur bacteria the sulfur mainly consists of sulfur chains, irrespective of whether it is accumulated in globules inside or outside the cells. These results indicate that the speciation of sulfur in the sulfur globules reflects the different ecological and physiological properties of different metabolic groups of bacteria.

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Das gelbe Element und seine erstaunliche Vielseitigkeit

Abstract: Abb. 2. Freilager fur granulierten

Cited by 28 publications

References 24 publications

Utilization of solid ‘elemental’ sulfur by the phototrophic purple sulfur bacterium Allochromatium vinosum: a sulfur K-edge X-ray absorption spectroscopy study

Utilization of solid ‘elemental’ sulfur by the phototrophic purple sulfur bacterium Allochromatium vinosum: a sulfur K-edge X-ray absorption spectroscopy study

Unexpected extracellular and intracellular sulfur species during growth of Allochromatium vinosum with reduced sulfur compounds

Quantitative speciation of sulfur in bacterial sulfur globules: X-ray absorption spectroscopy reveals at least three different species of sulfur

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