Three Na(+)-K(+)-ATPase (nka) α-subunit isoforms, nka α1a, nka α1b, and nka α1c, were identified from gills of the freshwater climbing perch Anabas testudineus. The cDNA sequences of nka α1a and nka α1b consisted of 3,069 bp, coding for 1,023 amino acids, whereas nka α1c was shorter by 22 nucleotides at the 5' end. In freshwater, the quantity of nka α1c mRNA transcripts present in the gills was...

Environmental issues are a growing concern within agriculture. Several of them can be categorized under the following headings: manure storage and handling, air quality, manure nutrient concentrations, and amounts of soil nutrients. Recently introduced, EcoCare feed (Land O'Lakes Purina Feed LLC, Shoreview, MN) is a dedicated and affordable feeding program addressing manure management, ammonia ...

In humans, NH(3) transport across cell membranes is facilitated by the Rh (rhesus) family of proteins. Human Rh C glycoprotein (RhCG) forms a trimeric complex that plays an essential role in ammonia excretion and renal pH regulation. The X-ray crystallographic structure of human RhCG, determined at 2.1 A resolution, reveals the mechanism of ammonia transport. Each monomer contains 12 transmembr...

1 Metabolic acidosis is a wellrecognized component of chronic renal failure (CRF). Metabolic acidosis in renal failure results primarily from the limited ability of failing kidneys to excrete hydrogen ions and regenerate bicarbonate. Normal acid-base balance is maintained by a combination of tubular reabsorption of filtered bicarbonate and excretion of hydrogen ions with ammonia and urinary buf...

Hyperammonemia can be secondary to hepatic or non hepatic and idiopathic causes. Among non hepatic or non cirrhotic causes of hyperammonemia, excess of ammonia production or decrease in ammonia excretion predominates to produce the clinical syndrome. Cirrhosis is the commonest cause of hyperammonemia in adults. In children, disorders of urea cycle need to be considered as a suspecting but rare ...

Ammonia-nitrogen excretion and oxygen consumption rates after a meal were followed in carp larvae and juveniles of different sizes, starting from early exogenous feeding and until they had reached about 1 g of body weight. There was an immediate rise in the nitrogen excretion rate after feeding; the amplitude and duration of this increase were affected by body weight (BW) and the amount of nitr...