Results 161 to 170 of about 1,262 (192)
Some of the next articles are maybe not open access.
Incorporation of amino sugars into walls during heterocyst differentiation
Developmental Biology, 1971Abstract During exponential growth of the blue-green alga Anabaena cylindrica , a small fraction of the vegetative cells differentiates into heterocysts. The incorporation of amino sugars during formation of the thick wall of the heterocyst was studied by pulse-labeling exponentially growing filaments with 14 CO 3 2− and by ...
J H, Dunn, R D, Simon, C P, Wolk
openaire +2 more sources
Organization and transcription of genes important in Anabaena heterocyst differentiation
Annales de l'Institut Pasteur / Microbiologie, 1983The structural genes for nitrogenase and nitrogenase reductase have been cloned from Anabaena and physically mapped. The map differs from that of Klebsiella in several ways, including the insertion of 11 kbp between nifK and nifD in Anabaena. One nif RNA transcript has been studied in detail and shown to originate from a site in the Anabaena chromosome
R, Haselkorn +3 more
openaire +2 more sources
Heterocyst differentiation and tryptophan metabolism in the cyanobacterium Anabaena sp. CA
Archives of Biochemistry and Biophysics, 1980Abstract Anabaena sp. CA does not synthesize heterocysts or express nitrogenase activity when grown with nitrate as the nitrogen source. Heterocysts and nitrogenase are induced in such cultures by various tryptophan analogs. The effect does not require inhibition of de novo protein synthesis in the culture. It is restricted to tryptophan analogs only,
P J, Bottomley +2 more
openaire +2 more sources
Recent Aspects of Heterocyst Biochemistry and Differentiation
1984Among prokaryotes, cyanobacteria are the only clear-cut examples of intercellular compartmentation. Filamentous cyanobacteria can form the different cell types of vegetative cells, heterocysts and spore-forming akinetes. Heterocysts are often thought to be anaerobic compartments containing little else than nitrogenase. Experimental evidence of the past
H. Bothe +4 more
openaire +1 more source
Heterocyst Differentiation and Nitrogen Fixation in the Cyanobacterium Anabaena
1999Some cyanobacteria, e.g. Anabaena, protect nitrogenase from oxygen by differentiating specialized cells, heterocysts, at regular intervals along each filament. These cells have a new outer envelope consisting of a polysaccharide layer and a crystalline glycolipid layer.
R. Haselkorn, K. Jones, W. J. Buikema
openaire +1 more source
Nature, 1985
Nitrogen fixation by the cyanobacterium Anabaena is carried out in heterocysts, specialized, non-dividing cells which differentiate under conditions of ammonia or nitrate deprivation. In Anabaena, heterocyst differentiation is accompanied by rearrangement of some nitrogen fixation genes.
J W, Golden, S J, Robinson, R, Haselkorn
openaire +2 more sources
Nitrogen fixation by the cyanobacterium Anabaena is carried out in heterocysts, specialized, non-dividing cells which differentiate under conditions of ammonia or nitrate deprivation. In Anabaena, heterocyst differentiation is accompanied by rearrangement of some nitrogen fixation genes.
J W, Golden, S J, Robinson, R, Haselkorn
openaire +2 more sources
Microbiology, 2004
The impact of calcium signals in virtually all cells has led to the study of their role in prokaryotic organisms as stress response modulators. Cell differentiation in adverse conditions is a common Ca2+-requiring response. Nitrogen starvation induces the differentiation of N2-fixing heterocysts in the filamentous cyanobacterium Anabaena sp.
I, Torrecilla +3 more
openaire +2 more sources
The impact of calcium signals in virtually all cells has led to the study of their role in prokaryotic organisms as stress response modulators. Cell differentiation in adverse conditions is a common Ca2+-requiring response. Nitrogen starvation induces the differentiation of N2-fixing heterocysts in the filamentous cyanobacterium Anabaena sp.
I, Torrecilla +3 more
openaire +2 more sources
Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1979
The thylakoids of vegetative cells of the filamentous cyanobacterium, Anabaena cylindrica, are capable of oxygen-evolving photosynthesis and contain both Photosystems I and II (PSI and PSII). The heterocysts, cells specialized for nitrogen fixation, do not produce oxygen and lack Photosystem II activity, the major accessory pigments, and perhaps the ...
T H, Giddings, L A, Staehelin
openaire +2 more sources
The thylakoids of vegetative cells of the filamentous cyanobacterium, Anabaena cylindrica, are capable of oxygen-evolving photosynthesis and contain both Photosystems I and II (PSI and PSII). The heterocysts, cells specialized for nitrogen fixation, do not produce oxygen and lack Photosystem II activity, the major accessory pigments, and perhaps the ...
T H, Giddings, L A, Staehelin
openaire +2 more sources
Fluorescence spectroscopy study of heterocyst differentiation in Anabaena PCC 7120 filaments
Microbiology, 2013Filamentous Anabaena PCC 7120 differentiates nitrogen-fixing specialized cells called heterocysts at regular intervals following removal of combined nitrogen from the medium. Phycobiliproteins are degraded during differentiation. Heterocyst differentiation was followed at the single cell level by using confocal fluorescence microscopy.
Shan, Ke, Robert, Haselkorn
openaire +2 more sources
A new player in the regulatory cascade controlling heterocyst differentiation in cyanobacteria
Molecular Microbiology, 2010SummaryHeterocysts are terminally differentiated cells that fix nitrogen in filaments of the cyanobacterium Anabaena PCC 7120. They differentiate from vegetative cells at regular intervals along each filament. The developmental process is initiated by an increase in the ratio of reduced carbon to reduced nitrogen.
openaire +2 more sources