title: [Sensitivity of the Rana temporaria tadpole chemoreceptor system to amino acids].
abstract: In behavioural experiments, studies have been made of the sensitivity of frog tadpoles to amino acids and creatine. The best index of stimulus perception was found to be the alimentary reaction of tadpoles to presentation of the solved substances. For different amino acids, the intensity of the evoked reaction decreases in the following order: ornithine--valine--lysine--isoleucine--arginine--glutamine and tryptophan--cysteine--asparagine--alanine--beta-phenylalanine--glycine. The effectiveness of creatine is rather high, i. e. between tryptophan and cysteine. In tadpoles from two age groups, threshold concentrations of some amino acids were determined which evoke alimentary reaction. It was shown that the sensitivity to 4 amino acids (from 5 investigated ones) decreases with age, the sensitivity to valine remaining unaffected.
mesh_terms: D000596:Amino Acids / Q000494:pharmacology*; D000818:Animals; D002628:Chemoreceptor Cells / Q000187:drug effects*; D003214:Conditioning, Classical / Q000187:drug effects; D005247:Feeding Behavior / Q000187:drug effects; D007814:Larva / Q000187:drug effects; D011896:Rana temporaria
chemical_list: D000596:Amino Acids
vernacular_title: Chuvstvitel'nost' khemoretseptornoĭ sistemy golovastikov Rana temporaria k amimokislotam.