Two Different Bump Types of the Ventral Photoreceptor of Limulus
2014
Reuß, Helmut | Stieve, Hennig
The elementary responses, the “bumps”, of the ventral photoreceptor of Limulus polyphemus were measured under voltage clamp conditions. We observed a type of bump which differs in size and time parameters from the “standard” bumps described previously. The average value of the amplitude of these “small, slow” bumps is about 20-fold smaller than that of the standard bumps (about 1 nA) and the average latency is about 25% longer. The duration of these bumps is 2 -5 -fold longer than that of a standard bump with the same amplitude. The small, slow bumps are probably light-induced and arise with about the same frequency after a light flash as standard bumps. The different kinetics of the two bump types can be explained by the assumption that the transduction chain branches into at least two pathways.
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