HetR is the master regulator of heterocyst differentiation in the filamentous cyanobacterium Anabaena sp. strain PCC 7120. Genetic selection was used to identify 33 amino acid substitutions in HetR that reduced the proportion of cells undergoing heterocyst differentiation to less than 2%. Conservative substitutions in the wild-type HetR protein revealed three mutations that dramatically reduced...

Daphnia p&x (Crustacea, Cladocera) was fed the blue-green algae (Cyanophyceae) Anacystis nidulans, Synechococcus elongata, S. cedrorum, Merismopedia sp., Anabaena flosaquae, Synechocystis sp., and Gloeocapsa alpicola. The green algae ( Chlorophyceae) Ankistrodesmus falcatus and Chlorella uulgaris were used for comparison. Direct observations were made of D. pulex feeding in depression slides fi...

On the quest of discovering novel local strains microalgal species that can be effectively cultured with industrial perspectives, two cyanobacterial Anabaena sp. and Cyanothece were isolated from lagoonal saltworks waters Messolonghi lagoon (W. Greece). They batch at 20–21.5 °C in six combinations three salinities (20, 40 60 ppt) light intensities (2000 8000 lux) resulting in: (a) grew best 20 ...