Results 141 to 150 of about 9,744 (190)

Faults in Determining Nitrogenase Activity

Journal of Agronomy and Crop Science, 2003
AbstractThe effects of three treatments performed before the acetylene reduction assay, i.e. shoot removal, shoot removal plus root shaking, and no disturbance (intact plants), and of the length of the incubation period (10, 30 or 60 min) on nitrogenase activity were investigated in pea (Pisum sativumL.).
G. Singh, D. Wright
exaly   +2 more sources

Nitrogenase Activity induced by Petunia Plantlets

Zeitschrift Für Pflanzenphysiologie, 1977
Summary Petunia seedlings were grown up under sterile conditions. At several time intervals Rhizobium sp. «cowpea» 32H1 was added. Ca. 3 week old plantlets were able to induce bacterial nitrogenase activity. Under the conditions used neither the plant lets nor the bacteria alone showed nitrogenase activity.
D. Hess, E.-M. Götz
exaly   +2 more sources

Substrate Interactions with the Nitrogenase Active Site

Accounts of Chemical Research, 2005
The chemical mechanism for biological cleavage of the N(2) triple bond at ambient pressure and temperature has been the subject of intense study for many years. The site of substrate activation and reduction has been localized to a complex cofactor, called FeMo cofactor, yet until now the complexity of the system has denied information concerning ...
Patricia C, Dos Santos, Robert Y, Igarashi, Hong-In, Lee, Brian M, Hoffman, Lance C, Seefeldt, Dennis R, Dean   +5 more
openaire   +2 more sources

Nitrogenase activity in Rhodopseudomonas sulfidophila

Archives of Microbiology, 1979
The marine purple nonsulfur bacterium, Rhodopseudomonas sulfidophila, strain W4, was capable of photosynthetic growth on dinitrogen and malate. Higher growth rates were observed when either glutamate or ammonia replaced dinitrogen as nitrogen source and when bicarbonate was omitted from the culture medium.
Bruce C. Kelley, Yves Jouanneau, Paulette M. Vignais   +2 more
openaire   +1 more source

Nitrogenase: substrate binding and activation

JBIC Journal of Biological Inorganic Chemistry, 1996
This commentary discusses the structure and function of the MoFe-protein of nitrogenase. The aim is to help the reader appreciate the ways in which the biomimetic and theoretical chemistry described in the four following commentaries contribute to understanding how protons, dinitrogen, substrate analogues and inhibitors are bound and subsequently ...
R. N. F. Thorneley, D. J. Lowe
openaire   +1 more source

Investigations of nitrogenase activity in rheotrophic peat

Canadian Journal of Microbiology, 1976
Acetylene reduction by the peat microflora was unaffected by light, but was sensitive to temperature, with an optimum of about 30 °C. The nitrogenase was inactivated by exposure to temperatures above about 35 °C. Activity occurred in completely anaerobic conditions; the rate of ethylene production was of the order of 0.5 nmol C2H4 ml−1h−1. Experiments
openaire   +2 more sources

Nitrogenase Activity in the Tobacco Rhizosphere

1991
Root samples of six different tobacco cultivars were submitted to the ARA assay. Nitrogenase activity occurred in 5 out of the 6 tobacco cultivars assayed. The nitrogen fixing microflora associated to the roots was mainly composed by Azospirilla but Bacillus and Pseudomonas also occurred.
P. Montaini, S. Fedi, S. Maruca, F. Favilli   +3 more
openaire   +1 more source

Nitrogenase activity of immobilized Azotobacter vinelandii

Biotechnology and Bioengineering, 1979
AbstractAs part of a program to investigate the use of biological nitrogen fixation for fertilizer ammonia production, an investigation into the immobilization of the aerobic, nitrogen‐fixing bacterium, Azotobacter vinelandii was undertaken. Immobilization was accomplished by adsorption onto an anionic exchange cellulose (Cellex E)with loadings as high
E, Seyhan, D J, Kirwan
openaire   +2 more sources

Binding and Activation of Dinitrogen in Nitrogenase

1985
The enzymology of nitrogenase and the relevant chemistry of dinitrogen complexes of transition metals are briefly reviewed. Enzymological and chemical data are converging to indicate that the prosthetic site (probably Mo in ‘FeMoco’) forms a dihydride which is the N2-binding site, that the N2 residue remains bound to that site during reduction and that
G. J. Leigh, J. R. Postgate
openaire   +1 more source

Nitrogenase Activity in Heterocysts of Blue–Green Algae

Nature, 1969
The firm identification of the heterocysts as the sites of nitrogenase activity marks them out also as the site of nitrogen fixation in blue green algae.
W D, Stewart, A, Haystead, H W, Pearson
openaire   +2 more sources