1887

Abstract

The purple sulfur bacterium can use elemental sulfur as an electron donor for anoxygenic photosynthesis. The elemental sulfur is taken up, transformed into intracellular sulfur globules and oxidized to sulfate. Commercially available ‘elemental’ sulfur usually consists of the two species -octasulfur and polymeric sulfur. The authors investigated whether only one sulfur species is used or at least preferred when takes up elemental sulfur and forms globules. To this end, was cultivated photolithoautotrophically with two types of elemental sulfur that differed in their -octasulfur : polymeric sulfur ratio, as well as with pure polymeric sulfur. Sulfur speciation was analysed using X-ray absorption spectroscopy, and sulfate contents were determined by HPLC to quantify the amount of elemental sulfur being taken up and oxidized by . The results show that uses only the polymeric sulfur (sulfur chain) fraction of elemental sulfur and is probably unable to take up and form sulfur globules from -octasulfur. Furthermore, direct cell–sulfur contact appears to be necessary for uptake of elemental sulfur by .

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2007-04-01
2019-11-13
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