蚊子视杆在明和暗中的缩小与增大
Diminution and enlargement of the mosquito rhabdom in light and darkness.
作者信息
White R H, Lord E
出版信息
J Gen Physiol. 1975 May;65(5):583-98. doi: 10.1085/jgp.65.5.583.
Abstract
The rhabdoms of the larval ocelli of the mosquito Aedes aegypti undergo morphological light and dark adaptation over periods of hours. The rhabdom enlarges during dark adaptation and grows smaller during light adaptation. Diminution is exponential, enlargement linear, and rates of change are proportional to log light intensity. Rhabdoms maintained at a constant intensity level off at a constant volume proportional to log intensity. We argue that changes in rhabdom volume after changes in light intensity reflect an influence of light on the turnover of photoreceptro membrane, and that the volumes at which rhabdoms level off represent equilibria between opposed processes of membrane loss and renewal.
摘要
埃及伊蚊幼虫单眼的视杆在数小时内会经历形态学上的明适应和暗适应。视杆在暗适应过程中会增大，在明适应过程中会变小。变小呈指数形式，增大呈线性，且变化速率与光强度的对数成正比。保持在恒定强度下的视杆会在与对数强度成正比的恒定体积处趋于稳定。我们认为，光强度变化后视杆体积的变化反映了光对光感受器膜更新的影响，且视杆趋于稳定的体积代表了膜损失和更新这两个相反过程之间的平衡。
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