Nitrogen fixation is an essential process that biologically transforms atmospheric dinitrogen gas to ammonia, therefore compensating for nitrogen losses occurring via denitrification and anammox. Currently, inputs and losses of nitrogen to the ocean resulting from these processes are thought to be spatially separated: nitrogen fixation takes place primarily in open ocean environments (mainly th...

Extracts of Closfridium pasfeurianum have been separated into five protein fractions, which are necessary for nitrogen fixation when pyruvate is used as the source of energy and electrons. Pyruvate oxidase is shown to be heat-stable and to have gel filtration properties corresponding to a molecular weight of 100,000 or greater. The function of ferredoxin as an electron carrier for nitrogen fixa...

To investigate the input of combined nitrogen by cyanobacteria in mangrove ecosystems and the seasonal fluctuation of this biological process, in situ nitrogen fixation activity was measured in day and night experiments carried out at Maruhubi mangrove ecosystem adjacent to Zanzibar town. Sampling was done for 12 months at two stations: Station I covering sandy sediments and Station II muddy se...

Geobacter species often play an important role in bioremediation of environments contaminated with metals or organics and show promise for harvesting electricity from waste organic matter in microbial fuel cells. The ability of Geobacter species to fix atmospheric nitrogen is an important metabolic feature for these applications. We identified novel regulatory cascades controlling nitrogen-fixa...

1.1 Biological nitrogen fixation and nitrogen nutrition in soybean plants Biological nitrogen fixation is one of the most important processes for ecosystem to access available N for all living organisms. Although N2 consists 78% of atmosphere, but the triple bond between two N atoms is very stable, and only a few group of prokaryotes can fix N2 to ammonia by the enzyme nitrogenase. Annual rate ...

Extracts of Closfridium pasfeurianum have been separated into five protein fractions, which are necessary for nitrogen fixation when pyruvate is used as the source of energy and electrons. Pyruvate oxidase is shown to be heat-stable and to have gel filtration properties corresponding to a molecular weight of 100,000 or greater. The function of ferredoxin as an electron carrier for nitrogen fixa...

Access to fixed or available forms of nitrogen limits the productivity of crop plants and thus food production. Nitrogenous fertilizer production currently represents a significant expense for the efficient growth of various crops in the developed world. There are significant potential gains to be had from reducing dependence on nitrogenous fertilizers in agriculture in the developed world and ...

Spatial variation in N2-fixation rate and diazotroph activity in the Tropical Atlantic J. P. Montoya, M. Voss, and D. G. Capone Georgia Institute of Technology, Atlanta GA, USA Institut für Ostseeforschung, Warnemünde, Germany University of Southern California, Los Angeles CA, USA Received: 3 April 2006 – Accepted: 24 April 2006 – Published: 9 November 2006 Correspondence to: J. P. Montoya (j.m...

The amount of nitrogen gas (N2) available for microbial protein synthesis via nitrogen fixation in the rumen was estimated. Measurements were made of nitrogen fixation by ruminal ingesta from goats fed low protein rations for a prolonged period of time, and by ingesta from sheep fed high protein rations. Nitrogen fixation by rumen microorganisms incubated for 30 or 180 min in vitro was measured...