The fine structure of Cyanidium caldarium, as seen in thin sections of KMnO(4)-fixed cells examined with the electron microscope, is described. This organism, whose taxonomic position among algae is undetermined, contains a single well defined chloroplast, a nucleus, and mitochondria. Studies, with the electron microscope, of Chlorella pyrenoidosa and Nostoc are also reported. Structural differ...

Cyanobacterial tRNA(Leu) (UAA) intron sequences from natural populations of Nostoc and other cyanobacteria were compared. Variation between the different introns was not randomly distributed but strongly restricted by the secondary and tertiary structure of the intron. Although all Nostoc sequences examined shared high similarity, differences were observed in one stem-loop. This stem-loop could...

Nostoc is a cyanobacterial genus, common in soils and a prolific producer of natural products. This research project aimed to explore and characterize Brazilian cyanobacteria for new bioactive compounds. Here we report the production of hepatotoxins and new protease inhibitors from benthic Nostoc sp. CENA543 isolated from a small, shallow, saline-alkaline lake in the Nhecolândia, Pantanal wetla...

Cyanobacteria are characterized as oxygenic photoautotrophs and use the reductive pentose phosphate (CalvinBenson) cycle in assimilation of C02. Based on enzyme assays and isotopic labeling experiments, a11 cyanobacteria are assumed to use reactions of the oxidative pentose phosphate pathway to generate reductant for maintenance energy in the dark period of natural diel cycles (Smith, 1983). In...

Pure cultures of the symbiotic cyanobacterium-bryophyte association with Anthoceros punctatus were reconstituted by using Nostoc sp. strain UCD 7801 or its 3-(3,4-dichlorophenol)-1,1-dimethylurea (DCMU)-resistant mutant strain, UCD 218. The cultures were grown under high light intensity with CO2 as the sole carbon source and then incubated in the dark to deplete endogenous reductant pools befor...

Seed inoculation with bacterial consortium was found to increase legume yield, providing a higher growth than the standard nitrogen treatment methods. Alfalfa plants were inoculated by mono- and binary compositions of nitrogen-fixing microorganisms. Their physiological and biochemical properties were estimated. Inoculation by microbial consortium of Sinorhizobium meliloti T17 together with a ne...

abstract the aim of this study was the identify cyanobacterial flora of rice–fields in dargaz, to interaction between cyanobacteria by culturing in solid medium bg-110 in laboratory was investigated. nostoc piscinale and nostoc spongiaeforme were identified as strongest and weakness species, respectively, regarding secondary metabolits producing (allelochemicals).the algal pairs were classified...