A direct method is described, in which a single reagent is used without deproteinization, for measuring blood urea nitrogen (BUN) in serum. The reagent is a mixture of diacetylmonoxime, antipyrine (phenazone), and arsenic pentoxide in acid solution. Lipemia, bilirubin to 25 mg/100 ml, hemoglobin to 1g/100 ml, and protein to 20g/100 ml do not affect the results. Beer’s law is followed at 460 nm ...

Contact of humans with the earth, either directly (e.g., with bare feet) or using a metal conductor, changes their biochemical parameters. The effects of earthing during physical exercise are unknown. This study was carried out to evaluate selected biochemical parameters in subjects who were earthed during cycling. In a double-blind, crossover study, 42 participants were divided into two groups...

Am. J. Enol. Vitic. 57:2 (2006) 113 Many potentially toxic substances can be present in food and beverages. Advances in detection methods have lead to the discovery of many compounds in wines, such as ethyl carbamate, that could be harmful to humans. This naturally occurring compound is considered potentially dangerous to humans, as it exhibits carcinogenic activity in a variety of laboratory a...

1. Four pregnant sows were used to study lysine requirements by means of the interpretation of values for plasma amino acid and blood urea. Diets containing graded levels of dietary lysine were fed at the rate of 1.82 kg/d. 2. Plasma lysine remained at a low level up to 6.4 g dietary lysine/kg (dry matter basis) and then increased sharply with further increases in lysine intake. 3. Blood urea l...

Many tests have been done to evaluate renal function in the toxemias of pregnancy and investigators (1, 2, 3, 4, 5) are agreed that the most accurate is the blood urea clearance. Addis (6, 7) has studied the urinary sediment in both normal and nephritic patients and is able by this means to classify the nephritides more accurately. These two tests are the most sensitive and accurate of anyused ...

The objective of this study was to determine the comparative changes in the monthly blood urea nitrogen (BUN) concentration, total protein (TP) concentration in blood serum and the body condition score of Nguni cows and heifers raised on sweetveld. Twenty-four clinically healthy animals in different parities, namely Parity 1 (n = 5), Parity 2 (n = 5), Parity 3-6 (n = 9) and heifers (n = 5), wer...

Kinetics of leucine and its oxidation were determined in human pregnancy and in the newborn infant, using stable isotopic tracers, to quantify the dynamic aspects of protein metabolism. These data show that in human pregnancy there is a decrease in whole-body rate of leucine turnover compared with nonpregnant women. In addition, data in newborn infants show that leucine turnover expressed as pe...

The Haber–Bosch process for the commercial production of ammonia demonstrated in 1913 was a watershed event in the mass production of urea, the principal nitrogen fertilizer for modern agriculture. Today, thanks to the so-called “green revolution” starting in in the 1960s, nearly half of the world population relies on increased crop yields, through the use of nitrogen fertilizers, to access aff...