The views that catabolism of protein leads to net production of acid and that urinary excretion of ammonium ion represents an equimolar excretion of proton are not compatible with basic chemical relationships (Atkinson, D. E., and Camien, M, N. (1982) Curr. Top. Cell. Regul. 21, 261-302). Metabolism of protein produces significant amounts of base (bicarbonate), which is disposed of in the synth...

The presence and activities of urease genes were investigated in 49 clinical, food, and environmental Bacillus cereus isolates. Ten strains were shown to have urease genes, with eight of these strains showing growth on urea as the sole nitrogen source. Two of the urease-positive strains, including the sequenced strain ATCC 10987, could not use urea for growth, despite their capacities to produc...

in order to evaluate the effects of different levels of potassium and nitrogen on nitrogen use efficiency (nue) and yield of rapeseed (hyola 401), a field experiment was conducted at rice research institute of iran (rasht) in a factorial experiment based on a complete randomized block design with 3 replications for two years (2008-2010). the first factor was pure potassium fertilizer in three l...

In order to investigate the effect of sugarcane compost on consumption of nitrogenous fertilizers in corn fields, a research project was conducted according split plot experiment based on randomized complete block design with three replications along 2015 year. The main plot included different chemical nitrogenous fertilizer (Zero; control, 60 and 120 kg.ha-1 pure nitrogen from urea ...

1. Three series of nitrogen balance experiments were performed with growing rats to test the effect of type and level of protein, fibre and starch on N excretion patterns. The design involved eighteen treatments in a 3 X 3 X 2 factorial experiment with five rats per dietary treatment. The eighteen treatments resulted from a combination of three protein treatments, three fibre treatments and two...

Optimizing crop N uptake while minimizing NH3 volatilization from fertilizer sources is a critical part of agricultural best management practices. Urea the most widely used but also one susceptible to losses as NH3. Fertilizer and additives can be reduce volatilization. Specifically, urease inhibitors [e.g., N-(n-butyl) thiophosphoric triamide (NBPT)] urea. A novel fused ammonium sulfate nitrat...

Excessive nitrogen fertilizer uses in crop field causes surface water pollution, which has a harmful effect on the ecosystem. The study was conducted to reducing use of fertilizers during cultivation pulse and as an alternative increase biofertilizers. Rhizobium can fix atmospheric soil; it be used urea for lentil (BARI Masur-6). leguminosarum isolated from root nodules (Lens culinaris) plants ...

Our objective was to determine the impact of supplemental energy, N, and protein on feed intake and N metabolism in sheep fed low-quality forage. Six Texel x Dorset wethers (16 mo, 63+/-3.1 kg) fitted with mesenteric, portal, and hepatic venous catheters were used in a Latin square design with five sampling periods. Lambs were fed chopped bromegrass hay (4.3% CP) to appetite, and a mineral mixt...

Plasma specimens from male blood donors gave a normal range for uric acid concentration of 3.3 to 7.5 mg/100 ml. Specimens from male outpatients, which were received in the laboratory for the analysis of urea but not of uric acid and proved to have normal concentrations of urea, showed a positively skewed distribution of values for uric acid from which a ;normal range' of 3.2 to 7.6 mg/100 ml w...

This paper analyzes the effect of exogenous urea in increased concentration gradient (0, 100, 500 and 1,000 mg L(-1)) on photosynthetic pigments (measured spectrophotometrically), uptake of (14)CO2 (using radioisotope), and urease activity (by measuring ammonia with Nessler's reagent) in leaves of Elodea densa Planch. We have observed that low concentration of urea (100 mg L(-1)) stimulates the...