El-Sheekh, Mostafa M Production and characterization of antimicrobial active substance from the cyanobacterium Nostoc muscorum. [electronic resource] - Environmental toxicology and pharmacology Jan 2006 - 42-50 p. digital Publication Type: Journal Article ISSN: 1382-6689 Standard No.: 10.1016/j.etap.2005.06.006 doi