Culture and isolation of phototrophic sulfur bacteria from the marine environment.

1. A new growth medium for Thiorhodaceae and Chlorobacteriaceae was adopted for the isolation of members of these bacterial families from marine habitats. 2. 47 strains comprising 13 species were enriched and isolated in pure cultures. 3. The strains were classified by physiological and morphological characteristics. 4. Many of the strains represent species in pure culture for the first time

Carotenoid composition in the genus Ectothiorhodospira pelsh.

The three species of the genus Ectothiorhodospira have been found to contain the carotenoids of the normal spirilloxanthin series, spirilloxanthin itself being the major component. While the carotenoid composition of E. mobilis and E. shaposhnikovii is not sufficiently different to allow interspecific differentiation, that of E. halophila differs from the two former species by its lack of rhodopin, and its higher amount of spirilloxanthin