2A1-B06 オオミジンコの行動制御とその機械的利用 : 光走性を利用した自動制御における反応遅れ時間の予測とその補正

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The authors have been investigated how to use protists as living micromachines by controlling their behavior using their taxis. However, there are various multicellular microorganisms that have not been investigated. In the authors' previous paper, the basic photo-reaction properties of Daphnia magna was investigated. Daphnia showed strong positive phototaxis to the blue light. A motion control system was produced by using a dish-shaped motion control pool with blue LEDs installed in the virtical wall of the pool. Manual motion control results showed that Daphnia has much better controllability and maneuvability than protists such as Paramecium or Euglena. In this study, an automatic motion control program was made based on a proportional control method and examined its performance. When controlled by the first program, Daphnia showed significant reaction time lag. It caused over-run at the turning point of the target route. Therefore, the relationship among the angle change of the target route, the reaction delay time and the distance of the over-run. The average delay time is about 0.1-0.3s. The individual difference and variation in the same cell, however, is wide. Therefore, a control program was made that could predict and adjust the target individual's delay time based on the previous reaction delay. By using this program, the quantity of the over-run remarkably reduced. In addition, operating tools for the Daphnia to improve the effeciency of the object manipuration was trially developed. By using these tools, it was succeeded to transport poly-caprolactone ball using tool wearing Daphnia.
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2A1-B06 オオミジンコの行動制御とその機械的利用 : 光走性を利用した自動制御における反応遅れ時間の予測とその補正

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