期刊
MICROBIOLOGY-SGM
卷 148, 期 -, 页码 267-276出版社
MICROBIOLOGY SOC
DOI: 10.1099/00221287-148-1-267
关键词
XANES; sulfur K-edge; quantitative analysis; sulfur-oxidizing bacteria; sulfur globules
类别
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据