トンボの複眼からの活動電流
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概要
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The electrical response (ERG) was recorded from the compound eye of the dragonfly larva and from the isolated receptor layer of the dragonfly (Pantala flavescens) with the glass capillar electrode (Tip<1μ). The ERG from the receptor layer of the dragonfly larva was not a simple negative wave as reported by some authors. Though the response to the stimulation of a very low intensity was a negative wave the increase in the intensity of the stimulation caused an appearance of a positive component in the ERG (Fig. 1). The ERG from the region proximal to the basement membrane also had a very complicated wave-form; the ERG showed a diphasic "on" and a positive "off" effect (Fig. 2). As the preparation went into decay the ERG from the receptor layer transformed into a simple negative wave (Fig. 3) and the ERG from the region proximal to the basement membrane also changed to a simple positive wave (Fig. 4). The disappearance of the positive component in the ERG from the receptor layer seems to be responsible for these canges in the ERG. The positive wave from the region proximal to the basement membrane was abolished by the application of KCl solution whereas the negative wave from the receptor layer remained unaffected (Fig. 6). This supports the conclusion reached by Naka and Kuwabara (1958a) that the negative wave from the receptor layer induces the positive wave from the region proximal to the basement membrane. From the isolated receptor layer of the dragonfly three types of ERG were recorded, a simple positive or negative wave which had a rather slow wave-form without showing any distinct response to the "off" of the illumination and a diphasic ERG as shown in Figs. 8 and 9. In this case the response to a very low intensity stimulation was a negative wave (Fig. 8A). When the stimulation was increased in intensity the "off" effect reversed its polarity suggesting the appearance of a positive component (Fig. 8B). The further increase in the intensity of stimulation accompanied the further increase in the amplitude of the positive component (Fig. 8, G, D, and E). As apparent from a series of records in Fig. 9 the "off" effect of the ERG from the isolated receptor layer was caused by the positive component. These results lead to a conclusion that the receptor layer contributes two components with opposite polarity to the ERG from the insect compound eye.
- 社団法人日本動物学会の論文
- 1959-01-15
著者
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