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Excision of the nifD element in the heterocystous cyanobacteria
Archives of Microbiology, 2008Heterocyst differentiation in cyanobacteria is accompanied by developmentally regulated DNA rearrangements that occur within the nifD, fdxN, and hupL genes. These genetic elements are excised from the genome by site-specific recombination during the latter stages of differentiation.
B J, Henson +3 more
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Heterocyst Metabolism and Development
1994Heterocysts 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 +2 more
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THE HETEROCYSTS OF BLUE‐GREEN ALGAE (MYXOPHYCEAE)
Biological Reviews, 1975Summary1. Heterocysts are found in many species of filamentous blue‐green algae. They are cells of slightly larger size and with a more thickened wall than the vegetative cells.2. Structural details of the heterocyst are: the presence of three additional wall layers, the absence of granules, sparse thylakoid network throughout, except at the poles ...
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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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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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Heterocyst Differentiation in Anabaena ambigua
Biochemie und Physiologie der Pflanzen, 1976Summary 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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Heterocyst Development and Pattern Formation
2014Most of the information about heterocyst development to date is based on the study of three species of heterocyst-forming filamentous cyanobacteria: Anabaena (also Nostoc) sp. strain PCC 7120, A. variabilis ATCC 29413, and Nostoc punctiforme ATCC 29133. This chapter focuses on those genes involved in signaling and regulation.
M. Ramona Aldea +2 more
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Nitrogen Fixation by Cyanobacterial Heterocysts
1981This paper details current knowledge about nitrogen fixation by cyanobacterial (blue-green algal) heterocysts. I will first review the most direct evidence that aerobic nitrogen fixation is localized in heterocysts; will then recount the results of enzymatic studies which provide examples of specializations apparently supporting this localization; and ...
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