[Base composition and DNA content in single-cell Cyanobacteria]

The base composition and DNA content were determined in 19 strains of cyanobacteria. The content of GC varied within the range of 33.6 to 70.7 mol%, and the content of DNA, from 1.05 X 10(-14) to 28.7 X 10(-14) g per cell. The latter parameter almost directly depended on the cell volume. The cultures were subdivided into six groups according to the results obtained.