Results 181 to 190 of about 2,158,587 (221)

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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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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The LysR-type transcriptional factor PacR controls heterocyst differentiation and C/N metabolism in the cyanobacterium Anabaena PCC 7120.

Microbiology Research
PacR (All3953) has previously been identified as a global transcriptional regulator of carbon assimilation in cyanobacteria. In the facultative diazotrophic and filamentous cyanobacterium Anabaena PCC 7120 (Anabaena), inactivation of pacR has been shown ...
G. Lin, Ju-Yuan Zhang, Z. Shao, Chen Yang, Guoping Zhao, Kaixin Huang, Cheng-Cai Zhang   +6 more
semanticscholar   +1 more source

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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The Making of a Heterocyst in Cyanobacteria.

Annual Review of Microbiology, 2022
Heterocyst differentiation that occurs in some filamentous cyanobacteria, such as Anabaena sp. PCC 7120, provides a unique model for prokaryotic developmental biology. Heterocyst cells are formed in response to combined-nitrogen deprivation and possess a
Xiaoli Zeng, Cheng-Cai Zhang
semanticscholar   +1 more source

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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Effect of 7-azatryptophan on heterocyst differentiation inAnabaena doliolum Bharadwaja

Proceedings / Indian Academy of Sciences, 1978
The effect of DL-7-azatryptophan, an analogue of tryptophan, has been studied on the heterocyst spacing pattern and the probability of proheterocyst regression inAnabaena doliolum. 7-azatryptophan suppressed growth and induced heterocyst differentiation in nitrogen-free medium.
Manju Agrawal, H D Kumar
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Heterocyst Differentiation and Nitrogen Fixation in the Cyanobacterium Anabaena

1999
Some 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
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