SUMMARY: The extracellular sheath was isolated from cultures of a unicellular diazotrophic cyanobacterium, ATCC 27152. Chemical analysis of lyophilized cell-free preparations indicated that the sheath was composed of an acidic heteropolysaccharide containing the neutral sugars rhamnose, 2--methylxylose, xylose, mannose, galactose and glucose, and the uronic acids mannuronic, glucuronic and galacturonic acid. Protein, pyruvic acid and -acetyl and sulphate groups were also detected. Quantitative differences in the carbohydrate and protein content of the sheath were observed between material collected from cultures grown with and without a source of combined nitrogen. The extent to which the external layers bound cadmium ions was affected by these differences.


Article metrics loading...

Loading full text...

Full text loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error