Angular sensitivity of blowfly photoreceptors: broadening by artificial electrical coupling
Angular sensitivity of blowfly photoreceptors: broadening by artificial electrical coupling
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苍蝇感光器的角度敏感性：通过人工电耦合加宽
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
D. Stavenga
中科院分区：
文献类型：
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作者：
J.G.J. Smakman;D. Stavenga
摘要1.通过测量角敏感度和量子凸起来研究R1-6光感受器之间的电耦合。2.记录来自两种极端类型的细胞：a型：具有衍射式角度敏感性轮廓的细胞(参见Smakman等人。1984年)。这些细胞只能获得较大的隆起。B型：在角灵敏度分布中具有大的、不对称边带的单元格。这些电池可以记录大的和小的凸起，特别是在离轴照明的情况下。3.A类电池的小边带的位置强烈地依赖于波长，正如对于衍射曲线所预期的那样。大非对称边带在b型池的角灵敏度分布中的位置与波长无关，表明这些边带不是由小面透镜的衍射图引起的。4.大非对称边带的角位置对应于相邻光接收器的位置，这表明R1-6光接收器之间存在电相互作用。5.研究了这种电耦合对微电极性能的依赖。有可能通过选择电极来改变电耦合的程度。6.所遇到的两种电池类型的特性差异被解释为一些R1-6光感受器被人为地电耦合，而另一些不是。讨论了电耦合与电极类型的关系以及耦合的可能人为来源。
Summary1.Electrical coupling between R1–6 photoreceptors was investigated by measuring angular sensitivities and quantum bumps.2.Recordings were made from two extreme types of cells: Type a: cells with a diffraction-like angular sensitivity profile (see Smakman et al. 1984). Only large bumps could be obtained from these cells. Type b: cells with large, asymmetrical sidebands in the angular sensitivity profile. Large and small bumps could be recorded from these cells, specifically with off-axis illumination.3.The position of the small sidebands of the type a cells depends strongly on wavelength, as expected for a diffraction curve. The position of the large asymmetrical sidebands in the angular sensitivity profile of the type b cells was found to be independent of wavelength, indicating that these sidebands are not caused by the diffraction pattern of the facet lens.4.The angular position of the large asymmetrical sidebands corresponds with the position of neighbouring photoreceptors, suggesting electrical interactions between R1–6 photoreceptors.5.The dependence of this electrical coupling on microelectrode properties was investigated. It was possible to change the degree of electrical coupling by selection of electrodes.6.The difference in properties of the two cell types encountered are interpreted as an indication that some R1–6 photoreceptors are artificially electrically coupled while others are not. The correlation of the electrical coupling with electrode types and the possible artificial origins of coupling are discussed.