Abstract
The water receptor in the “large” labellar taste hairs ofProtophormia terraenovae was investigated with electrophysiological methods. Total inhibition of the water receptor activity, achieved by sodium citrate, can be undone by certain sugars to different degrees. The inhibition by salt as well as the “reactivation” by D-fructose occur with Hill-coefficients greater 2, indicating strong positive cooperativity of the receptor membrane. The water receptor reacts highly specific: Of 16 sugars tested only D-fructose, D-fucose, and D-galactose are potent “reactivators”, while other monosaccharides as well as oligosaccharides and glucosides are less or not effective.
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