Renal ammonium excretion is increased by potassium depletion and reduced by potassium loading. To determine whether changes in potassium concentration would alter ammonia transport in the medullary thick ascending limb (MAL), tubules from rats were perfused in vitro and effects of changes in K concentration within the physiological range (4-24 mM) were evaluated. Increasing K concentration from...

The effects of feeding frequency on the specific dynamic action of the juvenile snakehead were examined. The fish were fed at four different frequencies with the same total meal intakes (4% body mass), and the postprandial oxygen consumption rate and ammonia excretion rate were determined for two days. The durations of oxygen consumption and ammonia excretion significantly increased with increa...

Hepatic encephalopathy is one of the major complications in decompensated liver cirrhosis. The current study was conducted to clarify the mechanisms of zinc deficiency in liver cirrhosis and its involvement in hepatic encephalopathy via ammonia metabolism. Ten patients each with compensated or decompensated liver cirrhosis and 11 healthy volunteers were enrolled in the study. Serum zinc levels ...

Haag and Larson (1) demonstrated in 1942 that in the case of nicotine the extent of urinary excretion of a chemical may be related to the reaction of urine. They emphasized the importance of taking into consideration the dissociation constant of a drug and the relative reabsorbability of the free and dissociated base. Extending these studies to the urinary excretion of quinine in man, Haag, Lar...

The diversity of mechanisms of ammonia and urea excretion by the gills and other epithelia of aquatic organisms, especially fish and crustaceans, has been studied for decades. Although the decades-old dogma of ;aquatic species excrete ammonia' still explains nitrogenous waste excretion for many species, it is clear that there are many mechanistic variations on this theme. Even within species th...

This study aimed to determine excretion rates of ammonia and urea of Australian short-finned Ž . elvers as influenced by varying dietary crude protein intake. Elvers 2.3"0.02 g were fed diets Ž . Ž . Ž . Ž . containing dietary crude protein levels of 25% P25 , 35% P35 , 45% P45 and 55% P55 dry Ž matter equivalent to 14.17, 19.24, 20.57 and 26.39 g CPrMJ, respectively pairs of diets P25, P35 . a...

LOTSPEICH, WILLIAM D. Renal hypertrophy in metabolic acidosis and its relation to ammonia excretion. Am. J. Physiol. 208(6) : I 135-1142. 1 g65.-The chronic ingestion of NH&l causes a true growth of the rat kidney. This involves a symmetrical increase in wet weight, dry weight, and nitrogen of the kidney tissue. Total DNA and RNA are also elevated, indicating that both cell numbers and cell siz...

Studies were performed on normal human subjects to determine the effects of potassium depletion on urine acidification. Depletion was induced by ingestion of a low potassium diet either alone or in combination with a potassium-binding resin, and the response of each subject to an acute ammonium chloride load in the potassium-depleted state was compared to his normal response. Urine pH was signi...