Wood frogs (Rana sylvatica) can accumulate substantial amounts of urea during fall and winter. In this study, maximal urea production capacity was examined in R. sylvatica collected at various times of the year and in response to experimental hyperuremia and dehydration. Activity and expression of carbamoyl phosphate synthetase I (CPS I), the hepatic regulatory enzyme of the urea cycle, were us...

Antiscalants are well known to prevent the precipitation of carbonate and sulphate scales calcium in reverse osmosis (RO) applications, but according literature their inhibitory ability against phosphate is not clear. The objective this study was investigate if antiscalants, without acid addition, can scaling RO systems. Eight antiscalants from different manufacturers spanning a range concentra...

In the phosphate industry, thickening process is vital to increasing solid slurry concentration and recovering water that as clear possible. The performance of depends mainly on coagulation–flocculation effect. based flocculant agents concentrate particles: flotation washing plant rejects large flocs, which accelerate their sedimentation velocity. industry worldwide uses synthetical flocculants...

A concentrated sulfuric acid dissolution technique and a GC method are described for the estimation of tributyl phosphate, tris(2-chloroethyl) phosphate, tris(chloropropyl) phosphate, tris(1,3-dichloro-2-propyl) phosphate, triphenyl phosphate and tris(butoxyethyl) phosphate in soft polyurethane foam. A soft polyurethane foam sample containing organophosphoric acid triesters was dissolved in con...

A diluted solution of a mixture of Hb S and Hb A in concentrated phosphate buffer was found to aggregate with a clear demonstration of delay time. The mechanism of the participation of Hb A in the aggregation of deoxy Hb S in concentrated phosphate buffer has been investigated. Both the delay time and the aggregation time in the polymerization reaction of mixtures of Hb A and Hb S were prolonge...

The effect of HbA and HbF on both the aggregation and deaggregation of deoxy HbS and deoxy HbCHarlem in concentrated phosphate buffers was studied by a turbidimetric method. Although pure deoxy HbA is fully soluble in 2.4 M potassium phosphate buffer, the same concentration of deoxy HbAS was insoluble in the same buffer. Since there was little dissolved hemoglobin in the solute of a mixture of ...

date syrup, date concentrate and date liquid sugar are among the products which are produced from low quality dates in date processing plants. the aim of this research was to investigate chemical characteristics and sensory properties of date syrup, date concentrate and date liquid sugar in comparison with sugar (sucrose) solutions and evaluate possible substitution of sucrose with these date b...

This experiment was designed to investigate the effects of different concentrations (0, 0.33, 0.66, 0.99, and 1.32 g/L) of a twin-strain of Saccharomyces cerevisiae live cells on in vitro mixed ruminal microorganism fermentation of corn starch, soluble potato starch, and sudangrass hay (60.5%, DM basis) plus concentrate mixture (39.5%, DM basis). Ruminal fluid was collected from two dairy cows,...

Seventy-three Holstein steers (initial BW 138.5 +/- 4.3 kg; approximately 3 mo of age) were allotted by BW to one of three growing-phase treatments to determine the effect of source and amount of energy on feedlot performance, and characteristics of subcutaneous (s.c.) and intramuscular (i.m.) adipose tissue. Treatment diets were 1) high concentrate fed ad libitum (ALC); 2) high forage fed ad l...