A rapid, relatively sensitive, and low-cost method for the determination of water-soluble urea content in dermatological therapy products and cosmetics is proposed using a new spectrophotometric assay with water as the only extraction solvent. Spectrophotometric methods involve addition of a known excess of bromate to urea in an acid medium, followed by the determination of residual bromine and...

Ureaplasma, a member of mycoplasmas, has a unique ATP synthesis system, which is coupled to the urea hydrolysis. Urease catalyzes the hydrolysis of urea into carbon dioxide and ammonia. Phylogenetic analyses of the urease genes indicated that Ureaplasma urease genes were not gained by recent horizontal transfer and have a unique evolutionary process. Ureaplasma unique ATP synthesis system leade...

in order to evaluate the effects of seed priming and different levels of nitrogen on yield and yield components of two corn (zea mays) hybrids, an experiment was carried out as split plot factorial based on a randomized complete block design (rcbd) with four replications in agricultural research station of shahrood university of technology. the treatments were urea levels (150, 250, 350 kg/ha) ...