Growth of Chlorobium Limicola F. Thiosulfatophilum on Polysulfides
Elemental sulfur is commonly found as an intermediate product in the oxidation of sulfide by green and purple bacteria. In the early tog phase, when growing on sulfide, batch cultures of these anoxygenic phototrophic bacteria have a milky appearance due to the often massive accumulation of elemental sulfur, either stored intracellulary (Chromatiaceae) or extracellularly (Chlorobiaceae and Ectothiorhodospiraceae). The amount of sulfur decreases after sulfide depletion, since its oxidation to sulfate continues, whereas its formation from sulfide has stopped. However, in some species sulfur oxidation does not start before the sulfide supply is exhausted (Trüper, 1978). In batch cultures of Chromatium vinosum it has been observed that, prior to sulfide depletion, the specific content of sulfur (mmol mg protein-1) shows little variation (van Gemerden, 1968, 1984). The maximum specific content of sulfur in different species of purple sulfur bacteria is very similar, i e, 30–35% of the ash-free dry weight (van Niel, 1931; Triiper and Schlegel, 1964; van Gemerden, 1968; lias and van Gemerden, 1987). Chlorobium species have been much less studied in this respect, but generally marine species deposit less sulfur than fresh water strains do. The accumulation of elemental sulfur is the result of the nature of the initial substrate, but the specific content of sulfur is very much influenced by the growth rate.
KeywordsCrystallization Sulfide Chlorophyll Enthalpy Disulfide
Unable to display preview. Download preview PDF.
- Eisenthat, R., and Cornish-Bowden, A., 1974, The direct linear plot.A new graphic procedure for estimating enzyme kinetic parameters, Biochem. J., 139:715.Google Scholar
- Pachmayr, F., 1960, Vorkommen und Bestimmung von Schwef eI verb i ndungen in Mineralwasser, Ph.D. Thesis, Univ. Munchen, F.R.G.Google Scholar
- Schedel, M., 1976, Untersuchungen zur anaeroben Oxidation reduzierter Schwefelverbindungen durch Thiobacillus denitrificans, Chromatium vinosum und Chlorobium limicola, Ph.D. Thesis, Univ. Bonn, F.R.G.Google Scholar
- Then, J., 1984, Beitrage zur Sulfidoxidation durch Ectothiorhodospira abdelmalekii und Ectothiorhodospira halochloris, Ph.D. Thesis, Univ. Bonn, F.R.G.Google Scholar
- Trüper, H. G., 1978, Sulfur metabolism, in: “The Photosynthetic Bacteria,” R.K. Clayton and W.R. Sistrom, eds., Plenum, New York.Google Scholar
- Trüper, H.G., and Schleget, H. G,, 1964, Sulphur metabolism in Thiorhodaceae. I. Quantitative measurements on growing cells of Chromatium okenii, Anthonie van Leeuwenhoek J. Microbiol. Serol., 30:225.Google Scholar
- van Gemerden, H., 1967, Competition between purple sulfur bacteria and green sulfur bacteria: role of sulfide, sulfur and polysulfides, Acta Acad. Abo., 47:13.Google Scholar