[Studying intermediatory regulation of heart rhythm using Daphnia magna as the alternative test object].

A functional test using Daphnia magna Straus hydrobionts is proposed for studying the role of intermediatory relationships in the heart rate (HR) regulation. It is established that the M-cholinomimetic carbamylcholine increases for two hours and decreases after 24 hours the HR in D. magna.

[Heart rate in Daphnia magna as a functional test for assessing efficacy of chemical agents].

It is suggested to use Daphnia magna Straus as a biotest object for the evaluation of heart rate (HR) as a functional parameter. The influence of cholinergic ligands (atropine and carbamylcholine) on the Daphnia cardiac rhythm has been studied. It is found that the cholinergic agonist and antagonist produced opposite influence on the HR and are capable of prevent the action of each other.

[Daphnia magna (straus): a new test object for modeling of dopaminergic neurotransmission deficiency induced by the selective neurotoxin 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine].

The possibility of using Daphnia magna (Straus) hydrobionts as a test object in modeling the disturbances of dopaminergic neurotransmission was investigated. The toxic action of a selective dopaminergic neurotoxin, 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), on D. magna was determined in a broad interval of concentrations (from 2 x 10(-5) to 10(-2) M).