Statistics and quantum bumps in arthropod photoreceptors.
Discrete waves of depolarizing membrane potential in arthropod photoreceptors, called quantum bumps, appear to result from single-photon absorptions of the visual pigment. Statistical analysis of bump records suggest a model for bump occurrence in dark-adapted receptors at low levels of illumination. This model assumes that a photon that isomerizes a visual pigment molecule can trigger a stochastic process that can produce no more than one bump under normal conditions, and that the stochastic processes triggered by different isomerized visual pigment molecules are independent of each other.
Yeandle
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D000818:Animals; D001181:Arthropods / Q000502:physiology*; D004175:Diptera; D004307:Dose-Response Relationship, Radiation; D006110:Grasshoppers; D006737:Horseshoe Crabs; D007473:Ion Channels / Q000502:physiology; D008027:Light; D008564:Membrane Potentials; D010786:Photoreceptor Cells / Q000502:physiology*; D012243:Rhodopsin / Q000502:physiology; D013269:Stochastic Processes; D014785:Vision, Ocular
D007473:Ion Channels; D012243:Rhodopsin