The formation of periplasmic sulfur globules is an intermediate step during the oxidation of reduced sulfur compounds in various sulfur-oxidizing microorganisms. The mechanism of how this sulfur is activated and crosses the cytoplasmic membrane for further oxidation to sulfite by the dissimilatory reductase DsrAB is incompletely understood, but it has been well documented that the pathway invol...

Biodesulfurization of coal has been carried out in batch culture of single strain and mixed culture of sulfur oxidizing bacteria. The pure cultures of Thiobacillus thiooxidans and Thiobacillus ferrooxidans utilized inorganic sulfur content of Malaysian coal. The chemolithotroph bacteria were able to grow on coal and metabolize the coal's sulfur content. The batch cultures of coal with 3-5 perce...

The 22 kDa SoxYZ protein complex from the green sulfur bacterium Chlorobium limicola f. thiosulfatophilum is a central player in the sulfur-oxidizing (Sox) enzyme system of the organism by activating thiosulfate for oxidation by SoxXA and SoxB. It has been proposed that SoxYZ exists as a heterodimer or heterotetramer, but the properties and role of the individual components of the complex thus ...

A novel mesophilic, sulfur- and thiosulfate-oxidizing bacterium, strain OK10(T), was isolated from deep-sea sediments at the Hatoma Knoll in the Mid-Okinawa Trough hydrothermal field. Cells of strain OK10(T) were short rods, each being motile by means of a single polar flagellum. The isolate grew at 10-40 degrees C (optimum 25 degrees C) and pH 4.5-9.0 (optimum pH 6.5). It grew chemolithoautotr...

Ferrobacillus ferrooxidans was isolated and named by Leathen and Braley (1) in 1954 and reported to be an obligate chemoautotroph which utilizes the oxidation of inorganic ferrous iron as a primary energy source. A somewhat similar bacterium, called Thiobaeillus ferrooxiduns, had previously been isolated by Cohner, Temple, and Hinkle (2) and characterized as an obligate chemoautotroph which wou...

Solar radiation and nutrient pulses regulate the ecosystem's functioning. However, little is known about how a greater frequency of pulsed nutrients under high ultraviolet radiation (UVR) levels, as expected in the near future, could alter the responses and interaction between primary producers and decomposers. In this report, we demonstrate through a mesocosm study in lake La Caldera (Spain) t...