Isolation and identification of a new antibacterial entity from the Antarctic cyanobacteriumNostocCCC 537Ravi K. Asthana; Deepali; Manoj K. Tripathi; Arunima Srivastava; Akhilesh P. Singh; Sureshwar P. Singh; Gopal Nath; Ranjana Srivastava; Brahm S. Srivastava · 2009