introduction feed shortage is the most important characteristic of iranian animal industry. increased costs of livestock production have caused the iranian producers to reduce feed costs mainly by inclusion low quality crop residues into ruminants diets. it is estimated that around 20 million tons wheat straw produced in iran every year. both the digestibility and crude protein content of wheat...

According to the usually accepted concept, the urea removed from the blood by the kidneys is excreted in two forms, chiefly as urea itself, but partly as ammonia. That the ammonia of the urine is formed in the kidneys was demonstrated by Nash and Benedict (1921), in work which has been confirmed by other authors (cf. Peters and Van Slyke, I, p. 373). Evidence from animal experiments in v4vo has...

We describe an improved enzymatic ultraviolet absorbance method for assaying creatinine in serum, plasma, and urine. Creatinine is hydrolyzed by creatinine iminohydrolase (EC 3.5.4.21) to ammonia and N-methylhydantoin. The ammonia produced combines with 2-oxoglutarate and NADPH in the presence of glutamate dehydrogenase to yield glutamate and NADP+. The consumption of NADPH, measured by a two-p...

Rhesus (Rh) protein involvement in ammonia transport processes in freshwater fish has received considerable attention; however, parallel investigations in seawater species are scant. We exposed pufferfish to high environmental ammonia (HEA; 1 and 5 mmol l(-1) NH(4)HCO(3)) and evaluated the patterns of ammonia excretion and gill Rh mRNA and protein expression. Gill H(+)-ATPase, NHE1, NHE2, NHE3,...

Li-mediated electrochemical ammonia synthesis (LiMEAS), a potential alternative to conventional thermochemical synthesis, is enabled by non-aqueous electrolytes with precisely controlled proton activity. However, the effects of generating anode reactions, such as hydrogen or electrolyte oxidation, unknown but crucially important for enabling steady-state LiMEAS without need sacrificial sources....

In vitro gut sac experiments were performed on freshwater and 60% seawater acclimated trout (Oncorhynchus mykiss) under treatments designed to discern possible mechanisms of intestinal ammonia transport. Seawater acclimation increased ammonia flux rate into the serosal saline (Jsamm) in the anterior intestine, however it did not alter Jsamm in the mid- or posterior intestine suggesting similar ...

Sustainable Ironmaking In article number 2300111, Yan Ma, Dierk Raabe, and co-workers provide a novel approach to deploying intermittent renewable energy mediated by ammonia using it for disruptive technology transition towards sustainable ironmaking. This sheds light on future ironmaking, which is urgently needed mitigate the gigantic amount of CO2 emissions from steel industry.

Strong acid solutions have been widely used in acid traps to determine concentrations of ammonia in ambient air or exhaust air stream. A literature survey indicates the method has a long history and a wide variation in use. Through a series of studies, this paper examines several factors including volume of the acid, depth of the acid, and airflow rate; that might affect the efficiency of sulfu...