Different environmental nitrogen sources play selective roles in the development of cyanobacterial blooms and noxious effects are often exacerbated when toxic cyanobacteria are dominant. Cylindrospermopsis raciborskii CS-505 (heterocystous, nitrogen fixing) and Raphidiopsis brookii D9 (non-N₂ fixing) produce the nitrogenous toxins cylindrospermopsin (CYN) and paralytic shellfish toxins (PSTs), ...

Among cyanobacteria, the heterocystous, N2-fixing Anabaena variabilis and the unicellular Anacystis nidulans have recently been shown to possess an NAD+-dependent, bidirectional hydrogenase. A 5.0 kb DNA segment of the `4. nidulans genome is now identified to harbor the structural genes hoxUYH coding for three subunits of the bidirectional hydrogenase. The gene arrangement in A. nidulans and in...

Terrestrial cyanobacterial strains were isolated from the Nishihara campus of the University of the Ryukyus, Okinawa, Japan. The 13 sampling sites were distributed in a 200 m radius and appeared as dry, blackened stains. From these small areas, 143 cyanobacterial strains were established. The strains were divided into five morphotypes, including unicells, unicells with baeocytes, non-branching ...

constitute the dominantN2-¢xingmembersof biological soil crusts oftheColoradoPlateau,USA Chris M. Yeager, Jennifer L. Kornosky, Rachael E. Morgan, Elizabeth C. Cain, Ferran Garcia-Pichel, David C. Housman, Jayne Belnap & Cheryl R. Kuske Biosciences Division M888, Los Alamos National Laboratory, Los Alamos, New Mexico, USA; School of Life Sciences, Arizona State University, Tempe, Arizona, USA; ...

Cyanobacteria from exotic niches represent a rich resource of a wide array of unique bioactive compounds that are largely under explored, and proving to be potent source of anticancer drugs. A filamentous non-heterocystous isolate was identified by light microscopy and molecular methods using 23S rDNA as a marker was found to belong to Plectonema genus of Cyanobacteria. Organic extract of diffe...