Thirty Brahman-Angus cross heifers at breeding age on extensive grazing were used to test the effectiveness of NH4Cl as an acidogenic agent at 15,18, 21 and 26 % of a dicalcium phosphate lick (A+), compared to a lick of 5 parts dicalcium phosphate and 3 parts salt (A-). Blood and faecal phosphorus (P), faecal calcium (Ca) and faecal magnesium (Mg) were significantly (P<0.05) higher in A+ compar...

Isothermal ternary diffusion coefficients for the system lysozyme chloride (1)+NH4Cl (2)+H2O at 258C and pH 4.5 have been measured interferometrically for five mean NH4Cl concentrations, C2 1⁄4 0:25, 0.5, 0.9, 1.2 and 1.5M, with C1 1⁄4 0:6mM. The main-term diffusion coefficient ðD11Þv varies slowly with C2. The main-term ðD22Þv increases with increasing NH4Cl concentration, as does the binary D...

The role of intracellular pH in stimulus-secretion coupling was investigated in cultured bovine adrenal medullary chromaffin cells. NH4Cl (1-25 mM) did not affect basal catecholamine or ATP release but markedly inhibited nicotine- or high K+-induced release by up to 60%. The inhibition had a rapid onset (less than 1 min) and was maximal at about 5 mM NH4Cl. The effect of NH4Cl was largely susta...

The effects of subclinical NH3 toxicity on circulating and regulatory hormone concentrations were investigated in seven Hereford steers. Ammonium chloride (NH4Cl) was infused via a right jugular vein catheter at a rate of 12 mumol NH4Cl.kg BW-1.min-1 for 240 min. This was preceded (PRE) and followed (POST) by saline infusions of 120 and 180 min, respectively. Blood samples were taken at 20-min ...

The relationship between oxidized nicotinamide adenine dinucleotide (phosphate) [NAD(P)+] transhydrogenase (EC 1.6.1.1) and NAD(P)+ glutamate dehydrogenase in several enteric bacteria which differ slightly in their regulation of nitrogen metabolism was studied. Escherichia coli strain K-12 was grown on glucose and various concentrations of NH4Cl as the sole nitrogen source. In the range of 0.5 ...

Chloroplast ATPase complex is activated by illumination in the presence or absence of dithiothreitol. ATPase complex which has been activated without dithiothreitol catalyzes ATP hydrolysis which is insensitive to stimulation by NH4Cl and is highly sensitive to medium pH. Addition of dithiothreitol during illumination results in an increase in the stimulating effect of NH4Cl on ATP hydrolysis a...

Klotho, a protein mainly expressed in kidney and cerebral choroid plexus, is a powerful regulator of 1,25(OH)2D3 formation. Klotho-deficient mice (kl/kl) suffer from excessive plasma 1,25(OH)2D3-, Ca(2+)- and phosphate-concentrations, leading to severe soft tissue calcification and accelerated aging. NH4Cl treatment prevents tissue calcification and premature ageing without affecting 1,25(OH)2D...

Five volunteers were studied before and after oral administration of NH4Cl (0.3 g/kg body wt.) given in order to create a moderate acidosis. The quadriceps femoris muscles were stimulated electrically for 75 s and muscle biopsies for determination of pH and metabolite content were taken before, at the end of contraction and after 10 min in the recovery period. Muscle pH at rest (mean 7.04) was ...