The rate of unidirectional [14C]urea efflux from human red cells was determined in the self-exchange and net efflux modes with the continuous flow tube method. Self-exchange flux was saturable and followed simple Michaelis-Menten kinetics. At 38 degrees C the maximal self-exchange flux was 1.3 X 10(-7) mol cm-2 s-1, and the urea concentration for half-maximal flux, K1/2, was 396 mM. At 25 degre...

AIM To assess the value of measuring the gastric juice urea:ammonium ratio in detecting Helicobacter pylori infection in patients with chronic renal failure. METHODS Twenty three (12 men) patients with established chronic renal failure and dyspepsia were studied. Gastric juice (2 ml) was aspirated during endoscopy to measure urea and ammonium. The upper gastrointestinal tract was routinely in...

plants are the most sources for cadmium enters to human food and this element in food regime may be a serious threat to human health. thus, the effect of azotobacter inoculum (azotobacter chroococcum), mycorrhiza fungi (glomus intraradaices) , zinc sulphate and urea on cadmium convertation and growth parameters of fenugreek medicinal plant (trigonella foenum gracum l.) in cadmium polluted soils...

Alkaline pretreatment of spruce at low temperature in both presence and absence of urea was studied. It was found that the enzymatic hydrolysis rate and efficiency can be significantly improved by the pretreatment. At low temperature, the pretreatment chemicals, either NaOH alone or NaOH-urea mixture solution, can slightly remove lignin, hemicelluloses, and cellulose in the lignocellulosic mate...

Urea is the principal end-product of nitrogen metabolism in mammals and is excreted almost entirely through the kidney. Studies by Shannon (1, 2) in the dog and by Chasis and Smith (3, 4) in man have shown that the renal clearance of urea is less than the inulin or creatinine clearance at all rates of urine flow, and that the clearance of urea increases as the urine flow rises. These observatio...

Electrocardiograms and surgical data from 12 patients with complete atrioventricular canal defects and 24 patients with ostium primum defects were evaluated before and after open heart surgery in order to document the incidence of postoperative right bundle branch block. The use and precise location of septal sutures utilized for repair were specifically noted in order to assess their possible ...

Ophthalmologists working in equatorial regions have long been familiar with the syndrome of solar conjunctivo-keratopathy. This condition, which affects only the interpalpebral area of the conjunctiva and cornea, is characterized by chronic discomfort and irritation, hypersensitivity to wind, dust, smoke, and sunlight, chronic conjunctival injection, fleshy protuberant pingueculae, usually cont...

field experiment was conducted to determine the economic threshold for spraying of flubendiamide against the brinjal shoot and fruit borer. flubendiamide was applied based on 10 thresholds including 2% shoot infestation, 5% shoot infestation, first fruit set + 2% fruit infestation, first fruit set + 5% fruit infestation, 2% fruit infestation, 5% fruit infestation, 2% shoot + 2% fruit infestatio...