Results 181 to 190 of about 2,720 (207)

Synthesis of nitrogenase by isolated heterocysts

Biochimica et Biophysica Acta (BBA) - Gene Structure and Expression, 1982
Heterocysts isolated from Anabaena variabilis incorporate [14C]leucine and [35S]methionine into trichloroacetic acid-precipitable material in the light. Analysis by polyacrylamide gel electrophoresis shows that the radioactivity is present in polypeptides of discrete sizes. However, the relative proportions of different proteins synthesized by isolated
S, Janaki, C P, Wolk
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Heterocyst Envelope Glycolipids

2009
Heterocyst-forming cyanobacteria simultaneously photosynthesize, producing oxygen (O2), and fix dini-trogen (N2), initially into ammonia, using nitrogenase enzymes that are rapidly inactivated by O2. These cyanobacteria enable nitrogenases to function in an oxic environment by segregating them within specialized cells, called heterocysts, in which O2 ...
Koichiro Awai, Sigal Lechno-Yossef, C. Peter Wolk   +2 more
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Heterocyst glycolipids of the cyanobacterium Cyanospira rippkae

Phytochemistry, 1993
Abstract The heterocyst glycolipids of the cyanobacterium Cyanospira rippkae have been isolated and their structures established to be 1-(O-α- d -glucopyranosyl)-3R,27R-octacosanediol and 1-(O-α- d -glucopyranosyl)-27-keto-3R-octacosanol by spectroscopic and chemical means.
A. SORIENTE, A. GAMBACORTA, A. TRINCONE, SILI, CLAUDIO, VINCENZINI, MASSIMO, G. SODANO   +5 more
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Tyrosine-induced heterocyst division inNostoc muscorum

Folia Microbiologica, 1987
Heterocyst size variation in Nostoc muscorum has been surveyed in the presence and absence of tyrosine. The heterocyst size exhibited two major peaks under both conditions but one of the peaks shifted towards larger size in tyrosine-containing medium. Heterocysts of larger volume exhibited division in the latter medium which was not observed in medium ...
K D, Pandey, A K, Kashyap
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Chemical composition and production of exopolysaccharides from representative members of heterocystous and non-heterocystous cyanobacteria

Phytochemistry, 1999
Exopolysaccharide (EPS) production and chemical composition of heterocystous and non-heterocystous cyanobacteria of subgroups 3, 4, and 5 together with four new species isolated from Pantelleria (Italy) hard sands and from a lake in the proximity of Edmonson Point in Antarctica were studied.
B Nicolaus, A Panico, L Lama, I Romano, M C Manca, A De Giulio, A Gambacorta   +6 more
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Heterocyst structure in Chlorogloea fritschii

Archiv f�r Mikrobiologie, 1967
Heterocysts of Chlorogloea fritschii were studied with the aid of light and electron microscopy. Two main types of heterocyst were recognized. One of these, termed here the H.1 cell, is the only type in filaments, but occurs also among endospore groups. The other, the H.3 cell, is restricted to endospore groups.
B. A. Whitton, A. Peat
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Molecular circuit of heterocyst differentiation in cyanobacteria

Journal of Basic Microbiology, 2020
AbstractDifferentiation commitment is one of the most complex mechanisms to study in biological science. One of the model systems used for understanding differentiation complexity is heterocyst development in cyanobacteria. Cyanobacteria have the capability of biological nitrogen fixation due to highly differentiated heterocyst cells. Once the nitrogen
null Harish, Kunal Seth
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Heterocyst Metabolism and Development

1994
Heterocysts are differentiated cells that are specialized for fixation of N2 in an aerobic environment. In heterocysts in the light, Photosystem I generates ATP, but no photosynthetic production of O2 takes place. Instead, reductant moves into heterocysts from vegetative cells. In return, fixed nitrogen moves from heterocysts to vegetative cells.
C. Peter Wolk, Anneliese Ernst, Jeff Elhai   +2 more
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Properties of heterocysts isolated with colloidal silica

Archives of Microbiology, 1976
A method is described for the isolation of heterocysts that are virtually free of contaminating cell debris after sonication of aerobically grown Anabaena 7120. Isolated heterocysts reduced acetylene in a light-dependent process in the absence of exogenously provided ATP; heterocysts supplied with ATP and Na2S2O4 reduced acetylene slowly in the dark ...
R B, Peterson, R H, Burris
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[73] Heterocyst isolation

1980
Publisher Summary This chapter discusses the methods for heterocyst isolation. Heterocysts display characteristic structural and functional properties. They appear under the light microscope as round yellowish-green cells, with a relatively homogenous content, surrounded by a thick secondary envelope. Heterocysts lack a functional photosystem II, fix
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