lactatingdairy cows (n=177) fed with grass and corn silage ad libitum kept in pasture, were randomly assigned to evaluate how urea nitrogen in plasma and milk can be related to their pregnancy rate. blood and milk samples were collected on the artificial insemination (ai) day to evaluate plasma urea nitrogen (pun) and milk urea nitrogen (mun) as well as progesterone levels, excluding cows with ...

Recycling of urea within the renal medulla is known to play an important role in the capacity of the kidney to concentrate urine. This recycling occurs simultaneously through a tubular and a vascular route (i.e., through the loops of Henle and vasa recta, respectively). In the present study, transgenic mice with a selective deficiency in UT-B (the urea transporter protein expressed in descendin...

In a previous paper,3) a colorimetric method for the determination of urea nitrogen in blood and urine was presented on the basis of a color reaction of urea with diacetyl monoxime (DAM) in phosphoric acid solution in the presence of D-glucuronolactone (GL), which served to produce a photo-stable color and eliminate the sigmoidal nature of calibration curve observed usually in the DAM method.4)...

background: the present study was carried out on the human population of kashmir valley to evaluate the status of the biochemical parameters of infected population. materials and methods: blood samples were collected from 514 individuals, 298 (57.97%) males and 216 (42.02%) females, 187 (36.38%) were found sero-positive for human toxocariasis. results: alkaline phosphatase level was found highe...

the physiological effects of a diet free of meat and eggs were studied. fifteen adult lacto-vegetarians were matched with non-vegetarian individuals by age, sex, body weight and height. a two-week dietary record was secured from each individual. the food consumed over a 48-hour period was measured. venous blood samples were taken from each individual for determination of serum total protein, ur...

tions a constant (1). If now these conditions are all complied with, but in addition some new factor is introduced, the effect on the rate of urea excretion can be measured by the deviation of the ratio from its constant value. Most of the experiments given in this paper were carried out on the two subjects, Add. and Dru., whose ratios under standard conditions are given in Paper V of this seri...

Quantitation of hemodialysis by measuring changes in blood solute concentration requires careful timing when taking the postdialysis blood sample to avoid errors from postdialysis rebound and from recirculation of blood through the access device. It also requires complex mathematical interpretation to account for solute disequilibrium in the patient. To circumvent these problems, hemodialysis c...

JHE RESULTS of blood glucose determinations and, to a lesser extent, of blood urea nitrogen determinations by an automatic analysis device* have been observed to be significantly lower than those of the commonly used routine methods (1, 2). A cause of these discrepancies was the gradually increasing sedimentation of cells in blood samples during an hour of processing, with resultant pick-up of ...

I. The object was to investigate the importance of urea as a source of ammonia in the large intestine of herbivores. Urea was present in small intestinal contents of slaughtered horses in concentrations similar to those in blood but, in the small intestine of slaughtered sheep, the urea was less than in blood. 2. There was little ammonia in small intestinal contents of slaughtered horses but co...