Most biological nitrogen fixation is catalyzed by molybdenum-dependent nitrogenase, an enzyme complex comprising two component proteins that contains three different metalloclusters. Diazotrophs contain a common core of nitrogen fixation nif genes that encode the structural subunits of the enzyme and components required to synthesize the metalloclusters. However, the complement of nif genes req...

background and aims. the aim of the present study was to compare the inhibitory effects of two systemic doses of hesa-a on prevention of 4-nqo-induced tongue neoplasms in rats. this study evaluated weight and histopathological changes. materials and methods. forty-eight male sprague dawley rats were divided into four groups of a, b, c and d of each 12 rats. the rats in groups b to d received 30...

Although superior high temperature tensile yield strength of entropy superalloys (HESAs) arises from their hierarchical microstructure, the precipitation processes driving its formation remains unclear. In present study, we analyze kinetics ?’ and ? precipitations by treating concurrent nucleation, growth coarsening using common computational thermodynamic kinetic tools to simulate microstructu...

Quality measures are often derived from weighted sums of diverse indicators, including ordinal Likert items. This procedure can be dangerously misleading because it takes no account of correlations among indicators. It also takes no account of whether indicators are input measures, e.g. prior achievement of incoming students, or outcome measures, e.g. proportion getting a good degrees or studen...