Microimaging of algal bioconvection by scanning electrochemical microscopy |
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Authors: | Shitanda Isao Yoshida Yutaka Tatsuma Tetsu |
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Affiliation: | Institute of Industrial Science, University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8505, Japan. |
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Abstract: | Local bioconvection generated by algal flagellar movement was imaged by scanning electrochemical microscopy. As a microelectrode probe vertically approached an individual multicellular flagellate alga, Volvox carteri, an oxidation current of a coexisting redox marker ([Fe(CN)6]4-) increased gradually, due to bioconvective enhancement of mass transport, and eventually decreased because the algal body blocked the diffusion of the marker. Two-dimensional imaging of the bioconvection of an individual alga was also possible. The bioconvective enhancement of the current was hindered by a toxic compound that inhibits the flagellar movement. |
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