Results 71 to 80 of about 38,650 (270)

Distributions and Abundances of Sublineages of the N2-Fixing Cyanobacterium Candidatus Atelocyanobacterium thalassa (UCYN-A) in the New Caledonian Coral Lagoon

Frontiers in Microbiology, 2018
Nitrogen (N2) fixation is a major source of nitrogen that supports primary production in the vast oligotrophic areas of the world’s oceans. The Western Tropical South Pacific has recently been identified as a hotspot for N2 fixation. In the Noumea lagoon
Britt A. Henke, Kendra A. Turk-Kubo, Sophie Bonnet, Jonathan P. Zehr   +3 more
doaj   +1 more source

Holistic view of biological nitrogen fixation and phosphorus mobilization in Azotobacter chroococcum NCIMB 8003

Frontiers in Microbiology, 2023
Nitrogen (N) and phosphorus (P) deficiencies are two of the most agronomic problems that cause significant decrease in crop yield and quality. N and P chemical fertilizers are widely used in current agriculture, causing environmental problems and ...
Karolina A. Biełło, Carlos Lucena, Francisco J. López-Tenllado, Jesús Hidalgo-Carrillo, Gema Rodríguez-Caballero, Purificación Cabello, Lara P. Sáez, Víctor Luque-Almagro, María Dolores Roldán, Conrado Moreno-Vivián, Alfonso Olaya-Abril   +10 more
doaj   +1 more source

Nitrogenase: A Draft Mechanism [PDF]

Accounts of Chemical Research, 2013
Biological nitrogen fixation, the reduction of N(2) to two NH(3) molecules, supports more than half the human population. The predominant form of the enzyme nitrogenase, which catalyzes this reaction, comprises an electron-delivery Fe protein and a catalytic MoFe protein.
Brian M, Hoffman, Dmitriy, Lukoyanov, Dennis R, Dean, Lance C, Seefeldt   +3 more
openaire   +2 more sources

Structural analysis of the NifL‐NifA complex reveals the molecular basis of anti‐activation of nitrogen fixation gene expression in Azotobacter vinelandii

The FEBS Journal, EarlyView.
Using cryo‐EM combined with biochemical and genetic approaches, we mapped the interaction surface between NifL and NifA to gain insights into the regulation of nitrogen fixation genes in A. vinelandii. Our findings suggest that NifL, a homolog of histidine kinases lacking phosphorylation activity, evolved to act as a steric block of NifA activity ...
Marcelo Bueno Batista, Jake Richardson, Michael W. Webster, Dmitry Ghilarov, John W. Peters, David M. Lawson, Ray Dixon   +6 more
wiley   +1 more source

Formation of NifA-PII complex represses ammonium-sensitive nitrogen fixation in diazotrophic proteobacteria lacking NifL

Cell Reports
Summary: Biological nitrogen fixation catalyzed by nitrogenase contributes greatly to the global nitrogen cycle. Nitrogenase expression is subject to regulation in response to nitrogen availability.
Yan Zeng, Lu Guo, Yongqiang Gao, Lingwei Cui, Mengmei Wang, Lu Huang, Mingyue Jiang, Ying Liu, Yaxin Zhu, Hua Xiang, De-Feng Li, Yanning Zheng   +11 more
doaj   +1 more source

Salicylic acid mediated changes in growth, photosynthesis, nitrogen metabolism and antioxidant defense system in Cicer arietinum L.

Plant, Soil and Environment, 2012
The present study reveals that the foliar application of salicylic acid (SA), irrespective of the concentration used, generated an increase of dry mass per plant, nodule dry mass and leghemoglobin content in chickpea plants.
Q. Hayat, S. Hayat, M.N. Alyemeni, A. Ahmad   +3 more
doaj   +1 more source

Contrasted Reactivity to Oxygen Tensions in Frankia sp. Strain CcI3 throughout Nitrogen Fixation and Assimilation [PDF]

, 2014
Reconciling the irreconcilable is a primary struggle in aerobic nitrogen-fixing bacteria. Although nitrogenase is oxygen and reactive oxygen species-labile, oxygen tension is required to sustain respiration.
Beauchemin, Nicholas, Ghodhbane-Gtari, Faten, Gtari, Maher, Hezbri, Karima, Ktari, Amir, Sbissi, Imed, Tisa, Louis S.   +6 more
core   +4 more sources

Unlocking nitrogen regulation: structural insights into the NifL‐NifA complex and prospects for engineered diazotrophs

The FEBS Journal, EarlyView.
The urgent need for sustainable agriculture places biological nitrogen fixation at the forefront of current biotechnological research. Plant growth‐promoting rhizobacteria play crucial roles in agriculture by enhancing nutrient absorption, regulating hormonal balance, and providing reduced nitrogen to plants. Among these, diazotrophic bacteria, such as
Edileusa Cristina Marques Gerhardt, Khaled A. Selim   +1 more
wiley   +1 more source

Two distinct ferredoxins are essential for nitrogen fixation by the iron nitrogenase in Rhodobacter capsulatus

mBio
Nitrogenases are the only enzymes able to fix gaseous nitrogen into bioavailable ammonia and hence are essential for sustaining life. Catalysis by nitrogenases requires both a large amount of ATP and electrons donated by strongly reducing ferredoxins or ...
Holly Addison, Timo Glatter, Georg K. A. Hochberg, Johannes G. Rebelein   +3 more
doaj   +1 more source

How Close We Are to Achieving Commercially Viable Large-Scale Photobiological Hydrogen Production by Cyanobacteria: A Review of the Biological Aspects

Life, 2015
Photobiological production of H2 by cyanobacteria is considered to be an ideal source of renewable energy because the inputs, water and sunlight, are abundant. The products of photobiological systems are H2 and O2; the H2 can be used as the energy source
Hidehiro Sakurai, Hajime Masukawa, Masaharu Kitashima, Kazuhito Inoue   +3 more
doaj   +1 more source