Nematocyst Inactivation During Feeding in Hydra Littoralis
نویسندگان
چکیده
منابع مشابه
Activation of the Feeding Reflex in Hydra littoralis
A simple and accurate quantitative assay of the glutathione-activated feeding reflex in Hydra is described. The results show: (a) There are a limited number of receptor-effector systems, probably localized in the area immediately around the mouth and on the tentacles. (b) Concentrations of glutathione greater than 5 x 10(-6)M activate all these systems; 10(-5)M glutathione elicits a half-maximu...
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Cnidarians are the simplest metazoans to exhibit satiety after feeding. When hydra are fed to repletion, they close their mouths and cease to capture prey. As feeding stops, contractions of the tentacles and body column increase. Our earlier experiments showed that a gel chromatographic fraction of prey substances inhibits prey capture. We now present evidence that the same fraction reduces the...
متن کاملMeasuring glutathione-induced feeding response in hydra.
Hydra is among the most primitive organisms possessing a nervous system and chemosensation for detecting reduced glutathione (GSH) for capturing the prey. The movement of prey organisms causes mechanosensory discharge of the stinging cells called nematocysts from hydra, which are inserted into the prey. The feeding response in hydra, which includes curling of the tentacles to bring the prey tow...
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The nematocyst extract of Hydra attenuata causes single conductance events in reconstituted planar lipid membranes as well as in inside-out patches derived from liposomes. The smallest single channel conductance level of the toxins is 110 pS. The conductance levels increase stepwise with time up to 2000 pS. These large conductance jumps indicate channel cooperativity. If the membrane-voltage is...
متن کاملGenetic analysis of developmental mechanisms in Hydra. IV. Characterization of a nematocyst-deficient strain.
The authors have previously found that mutant hydra strains showing various types of developmental defects can be isolated through sexual inbreeding of wild hydra. One such defective strain, called nem-4, contains virtually no stenoteles, one of the four types of nematocysts present in hydra, in its tentacles. However, stenoteles are present at a normal level in the body column of this strain, ...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 1984
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.111.1.31