Results 11 to 20 of about 468 (140)

Significant Contribution of the Unicellular Cyanobacterium UCYN-B to Oceanic Nitrogen Fixation [PDF]

National Science Review
ABSTRACT Dinitrogen (N2) fixation by diazotrophs forms a critical control on ocean productivity, yet our understanding of the distribution, abundance and activity of these microorganisms is informed by observations with limited geographical coverage.
Xin Liu, Dalin Shi
exaly   +6 more sources

Microevolutionary Patterns in Ecotypes of the Symbiotic Cyanobacterium UCYN-A Revealed From a Northwest Atlantic Coastal Time Series [PDF]

Science Advances, 2023
UCYN-A is a globally important nitrogen-fixing symbiotic microbe often found in colder regions and coastal areas where nitrogen fixation has been overlooked. We present a 3-year coastal Northwest Atlantic time series of UCYN-A by integrating oceanographic data with weekly nifH and16
Brent Robicheau, Dhwani K Desai, Julie LaRoche   +2 more
exaly   +4 more sources

Discovery of an endosymbiotic nitrogen-fixing cyanobacterium UCYN-A in Braarudosphaera bigelowii (Prymnesiophyceae). [PDF]

PLoS ONE, 2013
Braarudosphaera bigelowii (Prymnesiophyceae) is a coastal coccolithophore with a long fossil record, extending back to the late Cretaceous (ca. 100 Ma). A recent study revealed close phylogenetic relationships between B.
Kyoko Hagino, Ryo Onuma, Masanobu Kawachi, Takeo Horiguchi   +3 more
doaj   +4 more sources

Metagenomics Reveals the Genetic Diversity Between Sublineages of UCYN-A and Their Algal Host Plastids [PDF]

ISME Communications
Abstract UCYN-A (or Cand. Atelocyanobacterium thalassa) has been recognized as a globally distributed, early stage, nitrogen-fixing organelle (the “nitroplast”) of cyanobacterial origin present in the haptophyte alga Braarudosphaera bigelowii.
Brent Robicheau, John M Archibald, Julie LaRoche   +2 more
exaly   +4 more sources

The Transcriptional Cycle Is Suited to Daytime N₂ Fixation in the Unicellular Cyanobacterium “Candidatus Atelocyanobacterium thalassa” (UCYN-A)

mBio, 2019
Symbiosis between a marine alga and a N2-fixing cyanobacterium (Cyanobacterium UCYN-A) is geographically widespread in the oceans and is important in the marine N cycle. UCYN-A is uncultivated and is an unusual unicellular cyanobacterium because it lacks
María del Carmen Muñoz-Marín, Irina N. Shilova, Tuo Shi, Hanna Farnelid, Ana María Cabello, Jonathan P. Zehr   +5 more
doaj   +6 more sources

Enhancing Role of Nitrogen Fixation in Biogeochemical Cycles of the Pacific Arctic. [PDF]

Glob Chang Biol
Composite mean fields of sea surface temperature and sea‐ice distribution for September during 2015–2024, comparing years with high (2015, 2016, 2021) and low (2017, 2019, 2023) sea‐ice coverage. Earlier sea‐ice melt can promote the advection of diazotrophs (UCYN‐A2 and their haptophyte hosts) from the Bering Sea into the Beaufort Sea basin, where ...
Shiozaki T, Fujiwara A, Watanabe E, Nishino S, Harada N, Makabe A.   +5 more
europepmc   +2 more sources

Protein import into bacterial endosymbionts and evolving organelles. [PDF]

FEBS J
The acquisition of bacterial endosymbionts by ancient host cells followed by massive adaptation of the partners gave rise to mitochondria and plastids. Today, various systems with younger and less integrated endosymbionts provide insights into the initial steps in the endosymbiont to organelle transition.
Sørensen MES, Stiller ML, Kröninger L, Nowack ECM.   +3 more
europepmc   +2 more sources

N₂ fixation in the Mediterranean Sea related to the composition of the diazotrophic community and impact of dust under present and future environmental conditions [PDF]

Biogeosciences, 2022
N2 fixation rates were measured in the 0–1000 m layer at 13 stations located in the open western and central Mediterranean Sea (MS) during the PEACETIME cruise (late spring 2017).
C. Ridame, J. Dinasquet, J. Dinasquet, S. Hallstrøm, E. Bigeard, L. Riemann, F. Van Wambeke, M. Bressac, E. Pulido-Villena, V. Taillandier, F. Gazeau, A. Tovar-Sanchez, A.-C. Baudoux, C. Guieu   +13 more
doaj   +1 more source

The effect of nutrients on carbon and nitrogen fixation by the UCYN-A–haptophyte symbiosis [PDF]

The ISME Journal, 2014
Abstract Symbiotic relationships between phytoplankton and N2-fixing microorganisms play a crucial role in marine ecosystems. The abundant and widespread unicellular cyanobacteria group A (UCYN-A) has recently been found to live symbiotically with a haptophyte. Here, we investigated the effect of nitrogen (N), phosphorus (P), iron (Fe)
Krupke, A., Mohr, W., LaRoche, J., Fuchs, B., Amann, R., Kuypers, M.   +5 more
openaire   +3 more sources

Symbiotic UCYN-A strains co-occurred with El Niño, relaxed upwelling, and varied eukaryotes over 10 years off Southern California. [PDF]

ISME Commun, 2023
Abstract Biological nitrogen fixation, the conversion of N2 gas into a 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 a focal point due to its streamlined metabolism, intimate
Fletcher-Hoppe C, Yeh YC, Raut Y, Weissman JL, Fuhrman JA.   +4 more
europepmc   +4 more sources