PHOTOCONVERTIBLE PIGMENT STATES AND EXCITATION IN CALLIPHORA - INDUCTION AND PROPERTIES OF THE PROLONGED DEPOLARIZING AFTERPOTENTIAL
PHOTOCONVERTIBLE PIGMENT STATES AND EXCITATION IN CALLIPHORA - INDUCTION AND PROPERTIES OF THE PROLONGED DEPOLARIZING AFTERPOTENTIAL
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DOI：
10.1007/bf00535444
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发表时间：
1979-01-01
期刊：
影响因子：
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通讯作者：
RAZMJOO, S
中科院分区：
文献类型：
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作者：
HAMDORF, K;RAZMJOO, S
1.两个独立的组，其中涉及的不同状态的视觉色素的膜在无脊椎动物光感受器的激发（特别是参考延长去极化后电位，PDA）的建议模型进行了比较和评价。2.晚期受体电位（“正常”受体反应）作为感光细胞敏感性的指数，即视紫红质到变视紫红质转换的数量的指数的有效性，通过并行分光光度法进行验证。3.仅通过电生理学观察就可以计算出维生素A培育的丽蝇R1-6感光器的感杆中的1.3 x 10（8）个感光色素分子。4. PDA被证明是可量化的数量的视紫红质到metarhodopsin的转换由单个光量子的吸收。5.离散的膜波动（量子凸点）在PDA期间和在暴露于模拟PDA的持续光刺激期间的比较表明，PDA，类似于晚期受体电位，可能是由于量子凸点的总和。
1. The proposed models of two independent groups, which relate the different states of the visual pigment to the excitation of the membrane in invertebrate photoreceptors (with particular reference to the prolonged depolarising afterpotential, the PDA) are compared and evaluated. 2. The validity of the late receptor potential (the" normal" receptor response) as an index of photoreceptor sensitivity, ie, an index of the number of rhodopsin to metarhodopsin transitions, is verified by concurrent spectrophotometry. 3. Electrophysiological observations alone allow the calculation of 1.3 x 10 (8) photopigment molecules in the rhabdom of an R1-6 photoreceptor of a vitamin A-bred Calliphora. 4. The PDA is shown to be quantifiable in terms of the number of rhodopsin to metarhodopsin conversions by the absorption of single light quanta. 5. The comparison of discrete membrane fluctuations (quantum bumps) during the PDA and during exposure to sustained light stimuli that mimic the PDA suggest that, the PDA, similar to the late receptor potential, may be due to the summation of quantum bumps.