[Fractionation of stable isotopes of sulfur during its oxidation by Thiobacillus ferrooxidans]. 1980

G I Karavaĭko, and Iu M Miller, and O A Kapustin, and T A Pivovarova

The fractionation of sulfur isotopes was studied in the process of sulfur oxidation by Thiobacillus ferrooxidans. The isotope effect was observed at all stages of the bacterial growth during sulfur oxidation; as a result, residual sulfur became heavier whereas the fraction of colloidal sulfur and the fraction of sulfates became lighter. The isotope differences between the residual sulfur and the sulfates were greatest at the end of the lag phase (delta 34S = 0.38%) and the beginning of the stationary phase of the cultural growth (delta 34S = 0.34%). As was shown in model experiments, the phospholipids lecithin and cephalin can dissolve sulfur and form products enriched in 32S(delta 34S = -0.51 -1.60%). The mechanism of oxidation of elementary sulfur by Thiobacillus ferrooxidans is discussed.

UI MeSH Term Description Entries
D010084 Oxidation-Reduction A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471). Redox,Oxidation Reduction
D003470 Culture Media Any liquid or solid preparation made specifically for the growth, storage, or transport of microorganisms or other types of cells. The variety of media that exist allow for the culturing of specific microorganisms and cell types, such as differential media, selective media, test media, and defined media. Solid media consist of liquid media that have been solidified with an agent such as AGAR or GELATIN. Media, Culture
D013058 Mass Spectrometry An analytical method used in determining the identity of a chemical based on its mass using mass analyzers/mass spectrometers. Mass Spectroscopy,Spectrometry, Mass,Spectroscopy, Mass,Spectrum Analysis, Mass,Analysis, Mass Spectrum,Mass Spectrum Analysis,Analyses, Mass Spectrum,Mass Spectrum Analyses,Spectrum Analyses, Mass
D013431 Sulfates Inorganic salts of sulfuric acid. Sulfate,Sulfates, Inorganic,Inorganic Sulfates
D013455 Sulfur An element that is a member of the chalcogen family. It has an atomic symbol S, atomic number 16, and atomic weight [32.059; 32.076]. It is found in the amino acids cysteine and methionine. Sulfur-16,Sulfur 16
D013460 Sulfur Isotopes Stable sulfur atoms that have the same atomic number as the element sulfur, but differ in atomic weight. S-33, 34, and 36 are stable sulfur isotopes. Isotopes, Sulfur
D013855 Thiobacillus A genus of gram-negative, rod-shaped bacteria that derives energy from the oxidation of one or more reduced sulfur compounds. Many former species have been reclassified to other classes of PROTEOBACTERIA. Thiobacillus denitrificans,Thiobacillus thioparus

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