Results 61 to 70 of about 1,262 (192)

The heterocyst differentiation transcriptional regulator HetR of the filamentous cyanobactrium Anabaena forms tetramers and can be regulated by phosphorylation [PDF]

, 2016
Many filamentous cyanobacteria respond to the external cue of nitrogen scarcity by the differentiation of heterocysts, cells specialized in the fixation of atmospheric nitrogen in oxic environments. Heterocysts follow a spatial pattern along the filament
Valladares Ruiz, Ana, Flores García, Enrique, Herrero Moreno, Antonia   +2 more
core   +2 more sources

Coming out of the cold: Vanadium is an important player in N‐fixation in warm tropical environments

Ecology, Volume 107, Issue 4, April 2026.
Abstract Nitrogen (N)‐fixation is a crucial source of reactive N in terrestrial environments. The nitrogenase enzyme (Nase), responsible for this conversion, has three isoforms: molybdenum (Mo)‐, vanadium (V)‐, and iron (Fe)‐Nases. The Mo‐Nase is found in all N‐fixers, but the distribution pattern and drivers of V‐ and Fe‐Nases remain poorly understood.
Ana Fávaro, Manuela Dal Forno, Daniel Stanton, Lara Cecília Oliveira Lourenço, Flávia de Freitas Coelho   +4 more
wiley   +1 more source

Regulation of intracellular free calcium concentration during heterocyst differentiation by HetR and NtcA in Anabaena sp PCC 7120

, 2006
Calcium ions are important to some prokaryotic cellular processes, such as heterocyst differentiation of cyanobacteria. Intracellular free Ca2+ concentration, [Ca2+](i), increases several fold in hetero-cysts and is regulated by CcbP, a Ca2+-binding ...
Shi, Yunming, Zhang, Wei, Zhao, Jindong, Ye, Zi, Zhao, Weixing   +4 more
core   +1 more source

Transcription activation by NtcA and 2-oxoglutarate of three genes involved in heterocyst differentiation in the cyanobacterium Anabaena sp. strain PCC 7120 [PDF]

, 2008
In Anabaena sp. strain PCC 7120, differentiation of heterocysts takes place in response to the external cue of combined nitrogen deprivation, allowing the organism to fix atmospheric nitrogen in oxic environments. NtcA, a global transcriptional regulator
Enrique Flores, Ana Valladares, Valladares Ruiz, Ana, Antonia Herrero, Flores García, Enrique, Herrero Moreno, Antonia   +5 more
core   +1 more source

Molecular Diffusion through Cyanobacterial Septal Junctions

mBio, 2017
Heterocyst-forming cyanobacteria grow as filaments in which intercellular molecular exchange takes place. During the differentiation of N2-fixing heterocysts, regulators are transferred between cells.
Mercedes Nieves-Morión, Conrad W. Mullineaux, Enrique Flores   +2 more
doaj   +1 more source

A combinatorial strategy of alternative promoter use during differentiation of a heterocystous cyanobacterium [PDF]

Environmental Microbiology Reports, 2017
Summary Heterocystous cyanobacteria such as Nostoc sp. are filamentous photosynthetic organisms that, in response to nitrogen deficiency, undergo a differentiation process transforming certain, semi‐regularly spaced cells into heterocysts, devoted to nitrogen fixation ...
Muro Pastor, Alicia María, Brenes Álvarez, Manuel, Vioque Peña, Agustín   +2 more
openaire   +5 more sources

Growth and reworking of freshwater microbially‐mediated carbonates in wind‐stressed lake margins (Lago Sarmiento, Southern Patagonia)

Sedimentology, Volume 73, Issue 3, Page 706-741, April 2026.
ABSTRACT Understanding the biotic and abiotic influences on the deposition and diagenesis of recent microbial carbonates is crucial for addressing the environmental and ecological significance of ancient organosedimentary structures. This study investigates these factors and their expression in the microstructure of Holocene tufa thrombolites from a ...
Paulo Quezada, Mauricio Calderón, Anelize Bahniuk, Carolina Henríquez, Tatiana Stepanenko, José Pérez‐Donoso, Nicolás Bruna, Larissa Santos, Guilherme Fedalto, Luis Mancini, Leonardo Fadel Cury   +10 more
wiley   +1 more source

Description of five mutants of the cyanobacteriumAnabaenasp. strain PCC 7120 affected in heterocyst differentiation and identification of the transposon-tagged genes

, 2003
When growing on N-2 as sole nitrogen source, the filamentous cyanobacterium Anabaena sp. PCC 7120 forms N-2 fixing heterocysts in a semi-regular pattern.
Monika Kammerer, Hannus, Stefan, Maldener, Iris, Iris Maldener, Stefan Hannus, Kammerer, Monika   +5 more
core   +1 more source

Expression of Cyanobacterial Genes Involved in Heterocyst Differentiation and Dinitrogen Fixation Along a Plant Symbiosis Development Profile

Molecular Plant-Microbe Interactions, 2004
Members of the cyanobiont genus Nostoc, forming an endosymbiosis with members of the angiosperm genus Gunnera, undergo a number of characteristic phenotypic changes during the development of the symbiosis, the genetic background of which is largely ...
Chun-Mei Wang, Martin Ekman, Birgitta Bergman   +2 more
doaj   +1 more source

Mathematical study of pattern formation accompanied by heterocyst differentiation in multicellular cyanobacterium [PDF]

Journal of Theoretical Biology, 2015
The filamentous cyanobacterium, Anabaena sp. PCC 7120, is one of the simplest models of a multicellular system showing cellular differentiation. In nitrogen-deprived culture, undifferentiated vegetative cells differentiate into heterocysts at ~10-cell intervals along the cellular filament.
Jun-ichi, Ishihara, Masashi, Tachikawa, Hideo, Iwasaki, Atsushi, Mochizuki   +3 more
openaire   +2 more sources