Results 161 to 170 of about 2,612 (190)

On the reversibility of heterocyst differentiation

British Phycological Journal, 1974
Heterocyst development in the blue-green alga Anabaena cylindrica Lemm. was arrested by ammonia at an early stage of differentiation only. No dedifferentiation or germination of heterocysts in the presence of ammonia could be detected.
S.A. Kulasooriya, Peter Fay
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Heterocyst differentiation: from single mutants to global approaches

Trends in Microbiology, 2012
There are several instances of cellular differentiation in prokaryotes, including the formation of spores in Bacillus, the fruiting bodies of Myxococcus, and the stalked cells of Caulobacter. The vegetative cells of particular filamentous cyanobacteria can differentiate into three different cell types: N(2)-fixing heterocysts, spore-like akinetes, and ...
Alicia M, Muro-Pastor, Wolfgang R, Hess
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Incorporation of amino sugars into walls during heterocyst differentiation

Developmental Biology, 1971
Abstract 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
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Gene Expression during Heterocyst Differentiation

2013
Abstract Some cyanobacteria (oxygenic phototrophs) grow as chains of vegetative cells (filaments or trichomes). When placed in media lacking combined nitrogen, some cells in the filaments differentiate into N2-fixing heterocysts. The nitrogen fixation system is inactivated by oxygen, and the heterocyst provides a micro-oxic environment for ...
Antonia Herrero, Silvia Picossi, Enrique Flores   +2 more
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Heterocyst Differentiation in Anabaena ambigua

Biochemie und Physiologie der Pflanzen, 1976
Summary The undifferentiated algal filaments of Anabaena ambigua Rao were exposed to N-methyl-N'-nitro-N-nitrosoguanidine (NTG), and UV-irradiation during the induction period of heterocyst formation. NTG has been observed to inhibit the heterocyst differentiation by affecting the enzyme level.
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Organization and transcription of genes important in Anabaena heterocyst differentiation

Annales de l'Institut Pasteur / Microbiologie, 1983
The 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, D, Rice, S E, Curtis, S J, Robinson   +3 more
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Recent Aspects of Heterocyst Biochemistry and Differentiation

1984
Among 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, H. Nelles, T. Kentemich, H. Papen, G. Neuer   +4 more
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Fluorescence spectroscopy study of heterocyst differentiation in Anabaena PCC 7120 filaments

Microbiology, 2013
Filamentous 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
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Heterocyst differentiation and tryptophan metabolism in the cyanobacterium Anabaena sp. CA

Archives of Biochemistry and Biophysics, 1980
Abstract 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, C, Van Baalen, F R, Tabita   +2 more
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Genome rearrangements during Anabaena heterocyst differentiation

Canadian Journal of Botany, 1988
The filamentous cyanobacterium Anabaena sp. PCC 7120 produces specialized, terminally differentiated cells called heterocysts that are the sites of nitrogen fixation. The genome of Anabaena undergoes at least two specific developmentally regulated DNA rearrangements during heterocyst differentiation.
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