The role of the gastrointestinal tract as a major source of blood ammonia has been extensively studied in animals and in patients with liver disease. Less information is available concerning the relative contribution to the blood ammonia by other organs, such as muscle, liver, brain and kidney, which are known to be concerned with ammonia metabolism (1). The renal release of ammonia into the sy...

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...

Ammonia is an inorganic nitrogen compound that is metabolized and produced in all tissues via a number of important biochemical reactions. However, a major source of ammonia generation occurs in the gut following protein digestion and amino acid deamination. The subsequent ammonia-rich portal blood is effectively removed by the urea cycle in a healthy liver, maintaining circulating concentratio...

OBJECTIVES In this study we determined whether 13N-ammonia uptake measured late after injection provides additional insight into myocardial viability beyond its value as a myocardial blood flow tracer. BACKGROUND Myocardial accumulation of 13N-ammonia is dependent on both regional blood flow and metabolic trapping. METHODS Twenty-six patients with chronic coronary artery disease and left ve...

Ammonia concentrations in plasma may increase because of contamination and deterioration of blood components during specimen handling and storage. Using replicate specimens from healthy volunteers, we studied influences of specimen processing and storage procedures on ammonia measurements made with a self-contained reagent system. Under some conditions, ammonia concentrations more than doubled....

urea a excret creatin be use will respec ammo in the anima conce Aqu blood ammonia levels than terrestrial animals. In teleost fish, plasma total ammonia concentrations may vary between 0.05 and 1 mmol l21 (e.g. Wright et al. 1993), but when plasma ammonia levels approach 2 mmol l21 in arctic char, flaccid paralysis results (Lumsden et al. 1993). In contrast, blood ammonia levels greater than 0...

Rockfish, Sebastes schlegelii (mean length 14.53 ± 1.14 cm and mean weight 38.36 ± 3.45 g), were exposed for 4 weeks with the different levels of ammonia in the concentrations of 0, 0.1, 0.5, and 1.0 mg/L at 19 and 24 °C. The indicators of growth performance such as daily length gain, daily weight gain, condition factor, and hematosomatic index were significantly reduced by the ammonia exposure...