Desulfosporomusa polytropa gen. nov., sp. nov., a novel sulfate-reducing bacterium from sediments of an oligotrophic lake.

Five strains of sulfate-reducing bacteria were isolated from the highest positive dilutions of a most probable number (MPN) series supplemented with lactate and inoculated with sediments from the oligotrophic Lake Stechlin. The isolates were endospore-forming and were motile by means of laterally inserted flagella. They stained Gram-negative and contained b-type cytochromes.

Distribution of Nevskia ramosa and other rosette-forming neustonic bacteria.

Samples from 27 natural and artificial aquatic environments were analyzed for the presence of rosette-forming bacteria by a combined cultivation and molecular biological approach. Rosette-forming bacteria developed in 20 enrichment cultures with ammonia-free medium under air. Three morphotypes could be distinguished.

Uncultured giant sulfur bacteria of the genus Achromatium.

Achromatium is a genus of large unicellular sulfur bacteria. Despite being first described in the late 19th century, no Achromatium spp. have yet been isolated in culture, and for over 100 years, knowledge of their ecology, physiology and relationships to other bacteria has been scant.

A comparison of 35S-SO(4)(2-) radiotracer techniques to determine sulphate reduction rates in laminated sediments.

In order to find a simple and efficient method to determine sulphate reduction rates in environmental samples, we tested different 35S-SO(4)(2-) radiotracer techniques. The methods varied in the application of 35S-SO(4)(2-) and subsequent extraction of reduced 35S-sulphur species. Samples were either incubated as sediment slurries mixed with the radiotracer, or as undisturbed sediment cores after core injection of the radiotracer.

Isolation of Desulfovibrio intestinalis sp. nov. from the hindgut' of the lower termite Mastotermes darwiniensis.

A Gram-negative, anaerobic sulfate-reducing bacterium was isolated from hindgut contents of the lower termite Mastotermes darwiniensis Froggatt (strain KMS2). Strain KMS2 is motile by a single polar flagellum. The isolate possesses desulfoviridin and catalase activity.