Results 51 to 60 of about 113,928,681 (157)

Transient Ecological Niches for Diazotrophs in Upwelling Bays

Journal of Geophysical Research: Oceans, Volume 131, Issue 8, August 2026.
Abstract Diazotrophs, microorganisms capable of fertilizing the ocean through biological nitrogen fixation (BNF), are widespread in the oceans, including upwelling bays. However, their ability to respond to short‐lived upwelling pulses, lasting only a few days, remains poorly understood. To investigate diazotrophy across temporal scales, we analyzed 18 
D. Fernández‐Román, M. Fontela, E. Broullón, H. Farnelid, A. Fernández‐Carrera, B. Fernández Castro, R. A. Foster, S. Martínez‐García, E. Nogueira, B. Reguera, T. Rodríguez‐Ramos, M. M. Varela, E. Velasco‐Senovilla, B. Mouriño‐Carballido   +13 more
wiley   +1 more source

Cyanobacterial symbionts diverged in the late Cretaceous towards lineage-specific nitrogen fixation factories in single-celled phytoplankton

Nature Communications, 2016
Nitrogen fixation in oceans is facilitated by associations between marine phytoplankton and cyanobacteria such as UCYN-A. Here, Cornejo-Castillo et al. show that UCYN-A diversified in the late Cretaceous under strong purifying selection to become lineage-
Francisco M. Cornejo-Castillo, Ana M. Cabello, Guillem Salazar, Patricia Sánchez-Baracaldo, Gipsi Lima-Mendez, Pascal Hingamp, Adriana Alberti, Shinichi Sunagawa, Peer Bork, Colomban de Vargas, Jeroen Raes, Chris Bowler, Patrick Wincker, Jonathan P. Zehr, Josep M. Gasol, Ramon Massana, Silvia G. Acinas   +16 more
doaj   +1 more source

Programmed cell death in diazotrophs and the fate of organic matter in the western tropical South Pacific Ocean during the OUTPACE cruise [PDF]

Biogeosciences, 2018
The fate of diazotroph (N2 fixers) derived carbon (C) and nitrogen (N) and their contribution to vertical export of C and N in the western tropical South Pacific Ocean was studied during OUTPACE (Oligotrophy to UlTra-oligotrophy PACific Experiment ...
D. Spungin, N. Belkin, R. A. Foster, M. Stenegren, A. Caputo, M. Pujo-Pay, N. Leblond, C. Dupouy, S. Bonnet, I. Berman-Frank, I. Berman-Frank   +10 more
doaj   +1 more source

Diazotroph‐Driven 210Po Scavenging Reveals a Potential Radiotracer for Marine Nitrogen Fixation

Geophysical Research Letters, Volume 53, Issue 9, 16 May 2026.
Abstract The role of phytoplankton, particularly diazotrophs, in affecting in situ 210Po scavenging has been little investigated. Here, we first report an enhanced 210Po deficit in a cyclonic eddy core relative to its edge in the subtropical Pacific, coinciding with an elevated integrated nitrogen fixation rate (NFR).
Weifeng Yang, Hui Shen, Kuanbo Zhou, Feng Ling, Minfang Zheng   +4 more
wiley   +1 more source

Microbial Controls on Carbon Pump Partitioning in the Subtropical North Atlantic: Stoichiometry and Nutrient Limitation Across a Basin‐Scale Transect

Journal of Geophysical Research: Oceans, Volume 131, Issue 5, May 2026.
Abstract The subtropical North Atlantic is a key region for ocean carbon cycling despite its relatively small spatial extent. Here we present a high‐resolution transect (23°–27°N; ∼2° longitude spacing) across the North Atlantic Subtropical Gyre, integrating physical, chemical, and microbial observations to examine how hydrography and nutrient ...
Lukas Marx, Edward Mawji, Thierry Cariou, B. B. Cael, Michelle Hale, Sarah Reynolds   +5 more
wiley   +1 more source

Correlations across sites of two UCYN-A sublineages.

, 2023
For each UCYN-A sublineage and pathway, the Pearson correlations across sites (NPSG and coastal) were calculated for the median transcript levels for the genes in the pathway (requiring ≥5 genes detected at both sites).
Jonathan D. Magasin (8735343), María del Carmen Muñoz-Marín (15389179), Jonathan P. Zehr (8735355)   +2 more
core   +1 more source

Nitrogen isotopic evidence for a shift from nitrate- to diazotroph-fueled export production in the VAHINE mesocosm experiments [PDF]

Biogeosciences, 2016
In a coastal lagoon with a shallow, 25 m water column off the southwest coast of New Caledonia, large-volume ( ∼  50 m3) mesocosm experiments were undertaken to track the fate of newly fixed nitrogen (N).
A. N. Knapp, S. E. Fawcett, A. Martínez-Garcia, N. Leblond, T. Moutin, S. Bonnet   +5 more
doaj   +1 more source

Biotic–Abiotic Hybrid Strategies for Photosynthetic Nitrogen Fixation and Green Ammonia Synthesis

ChemistryEurope, Volume 4, Issue 4, April 2026.
Biotic‐abiotic photosynthetic systems integrate light‐harvesting semiconductors with nitrogenase's selective N2 reduction under ambient conditions, offering a sustainable alternative to conventional ammonia synthesis. Advancing rational interface design, efficient energy‐reaction coupling, and system integration is critical to realizing scalable, solar‐
Minghua Xu, Depeng Meng, Xiaowen Ruan, Sai Kishore Ravi   +3 more
wiley   +1 more source

EVIDENTIAL VALUE AND POTENTIAL USES OF NITROPLAST ORGANELLES IN UNDERWATER FORENSIC CRIME SCENE INVESTIGATIONS [PDF]

The Egyptian Journal of Forensic Sciences and Applied Toxicology
Background: Candidatus Atelocyanobacterium thalassa (UCYN-A) is a newly identified cyanobacterial symbiont with potential forensic applications, particularly in underwater investigations.
Görkem TAN
doaj   +1 more source

Dinitrogen fixation and dissolved organic nitrogen fueled primary production and particulate export during the VAHINE mesocosm experiment (New Caledonia lagoon) [PDF]

Biogeosciences, 2015
In the oligotrophic ocean characterized by nitrate (NO3−) depletion in surface waters, dinitrogen (N2) fixation and dissolved organic nitrogen (DON) can represent significant nitrogen (N) sources for the ecosystem.
H. Berthelot, T. Moutin, S. L'Helguen, K. Leblanc, S. Hélias, O. Grosso, N. Leblond, B. Charrière, S. Bonnet   +8 more
doaj   +1 more source