It has been postulated that the oxygen-evolving centers of photosystem II do not operate independently in the cyanobacterium Synechococcus leopoliensis in contrast to those of the chlorophyte Chlorella vulgaris and the diatom Phaeodactylum tricornutum (Mauzerall and Dubinsky (1993), Biochim. Biophys. Acta 1183, 123-129). Dependence would mean the exis­ tence of charge transfer among adjacent un...

Repeated dog deaths occurred in 2002, 2003, and 2005 after the animals drank water from the shoreline of the Tarn River in southern France. Signs of intoxication indicated acute poisoning due to a neurotoxin. Floating scum and biofilms covering pebbles were collected in the summers of 2005 and 2006 from six different sites along 30 km from the border of this river. The cyanobacterial neurotoxic...

Algae were diagnosed in three stations at seasons for 2018-2019 the Tigris River. It was with 158 species five main divisions (Chlorophyta, Bacillariophyta, Cyanophyta, Pyrrhophyta and Euglenophyta). Chlorophyta division represented 14 genera 33 a percent of 20.88%, Bacillariophyta 22 genus 84 53.16%, Cyanophyta was14 41 25.94%, pyrrhophyta four 2.53%, Euglenophyta one 0.63%. The study also sho...

A CPx-ATPase (named Bxa1) is induced in the cyanobacterium Oscillatoria brevis upon exposure to multiple heavy metal ions. The function of the bxa1 gene was examined by heterologous expression in both Saccharomyces cerevisiae (yeast) and Escherichia coli. Expression of bxa1 in E. coli caused Ag, Cd and Zn tolerance, but in yeast became sensitive to those metals. To reveal the role of the N-term...