Localized Bioconvection of Euglena Caused by Phototaxis in the Lateral Direction
Localized Bioconvection of Euglena Caused by Phototaxis in the Lateral Direction
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DOI：
10.1143/jpsj.80.064003
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发表时间：
2011-06-01
影响因子：
1.7
通讯作者：
Nishimori, Hiraku
中科院分区：
文献类型：
--
作者：
Suematsu, Nobuhiko J.;Awazu, Akinori;Nishimori, Hiraku
在一种光敏微生物--纤细裸藻悬浮液中观察到一种新的局部生物对流模式。悬浮液暴露于来自底部的明亮照明，其中细胞游走远离光源。然后是高密度点，即，沉降细胞，在密封室的一部分形成。这种局部模式与一般的生物对流形成对比，其中模式是在整个腔室中产生的。实验观察结果通过一个数学模型再现，该模型基于单个细胞在垂直和横向方向上的趋光性。我们的研究结果表明，对流维持向上游泳，一般生物对流，和本地化起源于侧向趋光性。
Localized pattern of bioconvection was newly observed in a suspension of Euglena gracilis, which was a photosensitive micro-organism. The suspension was exposed bright illumination from the bottom, in which the cells swam away from the light source. Then high-density spots, i.e., settling the cells, were formed at a part of a sealed chamber. This localized pattern was contrast with a general bioconvection where pattern was generated whole of a chamber. The experimental observations were reproduced by a mathematical model that was based on the phototaxis of individual cells in both vertical and lateral directions. Our results indicate that convection is maintained by upward swimming, as with general bioconvection, and the localization originates from lateral phototaxis.