Results 121 to 130 of about 468 (140)

Light and Depth Dependency of Nitrogen Fixation by the Non-Photosynthetic, Symbiotic Cyanobacterium UCYN-A [PDF]

Environmental Microbiology, 2021
Summary The symbiotic cyanobacterium UCYN‐A is one of the most globally abundant marine dinitrogen (N 2 )‐fixers, but cultures have not been available and its biology and ecology are poorly understood.
Mary R Gradoville, Jonathan P. Zehr, David M. Karl   +2 more
exaly   +7 more sources

New Insights Into the Ecology of the Globally Significant Uncultured Nitrogen-Fixing Symbiont UCYN-A [PDF]

Aquatic Microbial Ecology, 2016
Cyanobacterial nitrogen-fixers (diazotrophs) play a key role in biogeochemical cycling of carbon and nitrogen in the ocean. In recent years, the unusual symbiotic diazotrophic cyanobacterium Atelocyanobacterium thalassa (UCYN-A) has been recognized as one of the major diazotrophs in the tropical and subtropical oceans. In this review, we summarize what
María del Carmen Muñoz-Marín, Jonathan P. Zehr, Kendra A Turk-Kubo   +2 more
exaly   +5 more sources

Comparative Genomics Reveals Surprising Divergence of Two Closely Related Strains of Uncultivated UCYN-A Cyanobacteria [PDF]

ISME Journal, 2014
Abstract Marine planktonic cyanobacteria capable of fixing molecular nitrogen (termed ‘diazotrophs’) are key in biogeochemical cycling, and the nitrogen fixed is one of the major external sources of nitrogen to the open ocean. Candidatus Atelocyanobacterium thalassa (UCYN-A) is a diazotrophic cyanobacterium known for its widespread ...
Patricia Sánchez-Baracaldo, Jonathan P. Zehr, Deniz Bombar   +2 more
exaly   +5 more sources

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The Small Unicellular Diazotrophic Symbiont, UCYN-A, Is a Key Player in the Marine Nitrogen Cycle

Nature Microbiology, 2016
Microbial dinitrogen (N2) fixation, the nitrogenase enzyme-catalysed reduction of N2 gas into biologically available ammonia, is the main source of new nitrogen (N) in the ocean. For more than 50 years, oceanic N2 fixation has mainly been attributed to the activity of the colonial cyanobacterium Trichodesmium1,2. Other smaller N2-fixing microorganisms (
Marcel M M Kuypers, Sten Littmann, Bernhard M Fuchs   +2 more
exaly   +5 more sources

Global Phylogeography and Microdiversity of the Marine Diazotrophic Cyanobacteria Trichodesmium and UCYN-A

Abstract Cyanobacterial diazotrophs, specifically the genera Trichodesmium and UCYN-A, play a pivotal role in marine nitrogen cycling through their capacity for nitrogen fixation. Despite their global distribution, the microdiversity and environmental drivers of these diazotrophs ...
Angie Nguyen, Lucas J. Ustick, Alyse A. Larkin, Adam C. Martiny   +3 more
openaire   +2 more sources

Symbiotic diazotrophic UCYN-A strains co-occurred with El Niño, relaxed upwelling, and varied eukaryotes over 10 years off Southern California Bight

2022
Abstract Biological nitrogen fixation, the conversion of N2 gas into a more bioavailable form, is vital to sustaining marine primary production. Studies have shifted beyond traditionally studied tropical diazotrophs. Candidatus Atelocyanobacterium thalassa (or UCYN-A) has emerged as
Colette Fletcher-Hoppe, Yi-Chun Yeh, Yubin Raut, J.L. Weissman, Jed A. Fuhrman   +4 more
openaire   +1 more source

Distribution of a consortium between unicellular algae and the N ₂ fixing cyanobacterium UCYN ‐ A in the North Atlantic Ocean

Environmental Microbiology, 2014
Summary The globally abundant, uncultured unicellular cyanobacterium UCYN ‐ A was recently discovered living in association with a eukaryotic cell closely related to a prymnesiophyte.
Andreas Krupke, Gaute Lavik, Hannah Halm, Bernhard M. Fuchs, Rudolf I. Amann, Marcel M. M. Kuypers   +5 more
openaire   +1 more source

Targeted metagenomics reveals pangenomic diversity of the nitroplast (UCYN-A) and its algal host plastid

UCYN-A (Cand. Atelocyanobacterium thalassa) has recently been recognized as a globally-distributed, early stage, nitrogen-fixing organelle (the 'nitroplast') of cyanobacterial origin present in select species of haptophyte algae (e.g., Braarudosphaera bigelowii).
Ella Joy H Kantor, Brent M Robicheau, Jennifer Tolman, John M Archibald, Julie LaRoche   +4 more
openaire   +2 more sources

Distribution of a consortium between unicellular algae and the N2 fixing cyanobacterium UCYN-A in the North Atlantic Ocean.

Environmental microbiology, 2014
The globally abundant, uncultured unicellular cyanobacterium UCYN-A was recently discovered living in association with a eukaryotic cell closely related to a prymnesiophyte. Here, we established a double CAtalysed Reporter Deposition-Fluorescence In Situ Hybridization (CARD-FISH) approach to identify both partners and provided quantitative information ...
Krupke, A., Lavik, G., Halm, H., Fuchs, B., Amann, R., Kuypers, M.   +5 more
openaire   +4 more sources

Co-occurring Prymnesiophyceae hosts reveal the evolutionary diversification of the cyanobacterial symbiont UCYN-A

2014
Peer ...
Cornejo-Castillo, Francisco M., Cabello, Ana María, Salazar, Guillem, Massana, Ramon, Lima-Mendez, Gipsi, Hingamp, Pascal, Raes, Jeroen, Gasol, Josep M., Acinas, Silvia G.   +8 more
openaire   +1 more source