nitrogenase

The presence of genes that could contribute to autotrophic growth, for example, nitrogenase and CODH-ACS in clade 1 containing Mbb.

According to Garbaye and Frey-Klett [1], it is well established that some strains of Rhizobium can exhibit nitrogenase activity when grown in vitro on different media, but such activity has not been reported for Actinomycetes strains isolated from root nodules of N2-fixing nonlegumes [1].

Plants with satisfactory root development show better usage of sucrose, which is produced by photosynthesis and transported to the nodes, turning into alpha-keto acid and participating in the nitrogenase metabolism (COKER & SCHUBEL, 1981), which enables the maintenance of symbiosis in bacterial colonies and positively affects the symbiotic nitrogen fixation process and consequently grain productivity.

Plant growth and nitrogenase activity of glyphosate-tolerant soybean in response to foliar glyphosate applications.

Nitrogenase was activated when excess oxygen was removed by higher bacterial growth.

For instance, (i) Klebsiella microbes were isolated more frequently from the bowel of patients with active AS and their isolations were associated with clinical exacerbations of the disease; (ii) elevated levels of anti-Klebsiella antibodies were observed in the sera and jejunum fluids of AS patients when compared with matched healthy controls; (iii) molecular similarity was identified between Klebsiella nitrogenase reductase and HLA-B27 and between Klebsiella pullulanase and collagen types I, III, and IV; and (iv) in vivo cross-reactivity and cellular binding and in vitro cytotoxic activities of anti-Klebsiella antibodies were observed in patients with AS [38].

The presence of tungsten in the CaC[O.sub.3] structure of corals is very important because tungsten exerts an inhibitory effect on nitrogenase activity, replacing Molybdenum in the enzyme's structure and inhibiting its enzymatic activity (Kakefuda, Duke, & Duke, 1983).

In calcareous soils, there is a problem of nutrient uptake due to low organic matter, high pH and temperature; and B supply in these soils may be helpful to increase nitrogenase enzyme activity by providing adequate oxygen for N uptake (Bonilla et al., 1997).

[6] reported a crystal structure of carbon monoxide (CO) inhibited nitrogenase FeMo protein in which CO displaces sulphur from FeMo cofactor and bridges Fe2 and Fe6.