Behavioral study of chemoreception in the sea star Marthasterias glacialis: structure-activity relationships of @entity880 , @entity1522 , and XXXX .

@entity10653 @entity1522 @entity462 @entity4307 @entity534 @entity880 @entity505 @entity934
Behavioral responses of Marthasterias glacialis to low molecular compounds were studied under laboratory conditions. Feeding postures, stomach eversions and locomotion of initially inactive animals can be released with very dilute solutions of @entity880 , neutral 2 and 3 @entity505 @entity1522 , L isomers of 4 to 6 @entity505 neutral @entity1522 , @entity534 , @entity934 , and several of their analogues. Hunger was induced by temporary withdrawal of food. Responsiveness to feeding stimuli was controlled with @entity462 and @entity4307 . The lowest behavioral thresholds for the most effective feeding stimuli were 3 X 10(-11) mol/l for both enantiomers of @entity880 , 10(-8) mol/l for @entity10653 and both enantiomers of @entity462 and 10(-7) mol/l for @entity934 and some of the effective neutral @entity1522 . The behavioral threshold values for chemical stimuli differed by a factor between 30 and 100 in different sea stars. The test concentration was 3 X 10(-7) mol/l, the level at which @entity462 elicited a complete feeding response from all the animals. Structure-activity comparison of substances less effective than the control stimulus was thus possible. The behavioral threshold of fully effective substances was determined later. The independence of receptor mechanisms for different substances can be inferred as: @entity462 controlled responsiveness is not always accompanied by responsiveness to neutral @entity1522 . Autotomized marthasterias arms crawled after stimulation with @entity880 , @entity462 , and @entity934 but did not respond to the feeding stimuli betaine and @entity10653 . An animal became inactive if electric shocks were paired with @entity10653 or @entity462 emanating from an 'electric' food model.(ABSTRACT TRUNCATED AT 250 WORDS)
