acid dissociation constant acidity regulator algal bloom allantoin alternative medicine amide amine amino acid ammonia ammonium nitrate ammonium persulfate amphibian anabolism animal feed antioxidant arginine azodicarbonamide barbituric acid benzoyl peroxide big cat bird biuret blood plasma blood pressure blood urea nitrogen boiling point cas registry number carbamate carbamide peroxide carbodiimide carbon carbon dioxide carbonyl catabolism chemspider chemical compound chemical formula chlorine chlorine dioxide choline chloride cigarette citrulline cloud seeding combustion countercurrent exchange cysteine cystine debridement deep eutectic solvent density dermatitis dermatology diesel engine endothermic exhaust gas fertigation fertilizer fish flavour enhancer foaming agent functional group glazing agent helicobacter pylori hydantoin hydrogen insect international nonproprietary name international union of pure and applied chemistry nomenclature invertebrate ionic liquid isocyanate liver loop of henle malonic acid mammal marine biology melting point metabolic pathway metabolism microorganism molar mass molar volume nitrogen nutrient occlusive dressing organic chemistry organic compound organism ornithine osmolarity oxygen ph packaging gas phosgene plant plastic potassium bromate potassium cyanate potassium persulfate preservative prill protein ratooning reference ranges for blood tests rehydration renal function renal urea handling reptile saline selective catalytic reduction selective non-catalytic reduction simplified molecular input line entry specification skin sodium sodium chloride soil solubility sugar substitute sulfate tadpole uan urea breath test urea cycle urea nitrate urease urethane uric acid urine urine therapy vitalism water wax world health organization yeast