Abstract
Influence of hydrogen sulfide on Chlorobium limicola IМВ К-8 photosynthetic pigments composition and cells ultrastructure is studied. H2 S at concentrations 5–7 mM causes the decrease of pigments extracts optical density and absorption maximum at 421 nm transition to lower wavelength (406–408 nm). The results of pigments quantitative analysis after their separation by thin-layer chromatography have shown that at concentration 5 mM hydrogen sulfide causes 2.3 times decrease of bacteriochlorophylls content in bacterial cells, compared to control. The decrease of carotenoids content at this compound concentrations 5–6 mM is observed. At concentration 7 mM H2 S causes the disconnection of chlorosomes from cytoplasm membrane and the decrease of their quantity. Probably, chlorosomes degrade after the disconnection from membrane.
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