The close chemical relationship between cyanic acid and urea suggests a corresponding biochemical relationship whenever urea is synthesized or decomposed in animal or vegetable tissues. For this reason the zymolysis of urea was studied by the writer (1) to see if cyanic acid could be detected among the products of the reaction, which would indicate that the enzyme decomposition of urea proceeds...

The asymmetric unit of the crystal structure of the title compound, C(8)H(9)ClN(2)O(2), contains four independent mol-ecules. The dihedral angles between the urea N-(C=O)-N planes and the benzene rings are 83.3 (3), 87.8 (1), 89.1 (1) and 17.5 (2)° in the four mol-ecules. Extensive N-H⋯O hydrogen bonding is present in the crystal structure.

In the crystal of the title compound, C(10)H(14)N(2)O, double supra-molecular layers of PhCH(2)CH(2)CH(2)NHC(O)NH(2) are formed parallel to the bc plane by inter-molecular N-H⋯O hydrogen bonding, with R(2) (2)(8) and R(2) (1)(6) motifs in the b- and c-axis directions, respectively. The mean plane of the C(ar)-C-C group makes a dihedral angle of 84.8 (2)° with the benzene ring.

Saccharomyces cerevisiae can utilize arginine or urea as sole nitrogen source. Arginase degrades arginine to ornithine and urea; urea is catabolized to CO2 and NH3 by the urea degradation system which is composed of a urea carboxylase and an allophanate hydrolase. The arginine analogue, homoarginine, was shown to function as a nonmetabolizable inducer of arginase; it is also a competitive inhib...

poly urea-formaldehyde was synthesized simply and rapidly from urea and formaldehyde by condensation polymerization and studied for the sorption of trace acid blue from aqueous solution. the optimum ph value for sorption of the acid blue was 4. experimental results showed that the sorption capacity of poly urea-formaldehyde for acid blue was determined. the synthetic polymer can be reused for 5...

Urea as a source of cheap non-protein nitrogen is used to adulterate fish and meat meals which are basic components broiler diets. The present study was carried out elucidate the effects urea on weight gain, hematological biochemical profiles. A total 48 chicks were randomly allotted into 4 groups, designated Groups 1, 2, 3 12 birds each. Birds in fed diets containing at levels 1%, 2.5% 4%, res...

In order to investigate the effect of urea, Azocompost and cutting on growth characteristics of Oregano, a factorial split-plot experiment was conducted based on randomized complete block design with three replications at Yazd and Mashhad, Iran, during 2012-2013 growing season. Four urea levels and four Azocompost levels (to provide 0, 40, 80 and 120 kg N.ha-1 each) for Yazd location )0, 43.5, ...

Sustainable management of toilet waste must prevent disease transmission but allow reuse of plant nutrients. Inactivation of uterus-derived Ascaris suum eggs was studied in relation to ammonia in source-separated urine without additives and in human feces to which urea had been added, in order to evaluate ammonia-based sanitation for production of safe fertilizers from human excreta. Urine was ...

A simple and green chemical procedure was reported for the synthesis of dihydropyrimidinones from various aldehydes, ethyl acetoacetate and urea or thiourea using  holmium chloride as catalyst. The reactions were performed under solvent free conditions with ultrasound irradiation as the energy source. The advantages of this protocol include the excellent yield, operational simplicity, short tim...