Journal of comparative physiology

, Volume 126, Issue 2, pp 131–136 | Cite as

Effect of sugars on the labellar water receptor of the fly

  • H. Wieczorek
  • R. Köppl
Article

Summary

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.

Keywords

Sodium Sugar Citrate Oligosaccharide Receptor Activity 

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Copyright information

© Springer-Verlag 1978

Authors and Affiliations

  • H. Wieczorek
    • 1
  • R. Köppl
    • 1
  1. 1.Fachbereich Biologie der Universität RegensburgRegensburgGermany

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