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首页> 外文期刊>Cell motility and the cytoskeleton >Ciliary behavior of a negatively phototactic Chlamydomonas reinhardtii.
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Ciliary behavior of a negatively phototactic Chlamydomonas reinhardtii.

机译：负光战术衣藻的纤毛行为。

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With an instrument that can record the motion of both cilia of the unicellular alga Chlamydomonas reinhardtii for many hours, the behavioral differences of its two cilia have been studied to determine their specific role in phototaxis. The organism was held on a fixed micropipette with the plane of ciliary beating rotated into the imaging plane of a quadrant photodetector. The responses to square-wave light patterns of a wide range of temporal frequencies were used to characterize the responses of each cilium. Eighty-one cells were examined showing an unexpectedly diverse range of responses. Plausible common signals for the linear and nonlinear signals from the cell body are suggested. Three independent ciliary measures-the beat frequency, stroke velocity, and phasing of the two cilia-have been identified. The cell body communicates to the cilia the direction of phototaxis the cell desires to go, the absolute light intensity, and the appropriate graded transient response for tracking the light source. The complexity revealed by each measure of the ciliary response indicates many independent variables are involved in the net phototactic response. In spite of their morphological similarity, the two cilia of Chlamydomonas respond uniquely. Probably the signals from the cell body fan out to independent pathways in the cilia. Each cilium modifies the input in its own way. The change in the pattern of the effective and recovery strokes of each cilium associated with negative phototaxis has been demonstrated and its involvement in phototactic turning is described. Cell Motil. Cytoskeleton 61:97-111, 2005. (c) 2005 Wiley-Liss, Inc.
机译：用一种可以记录单细胞藻类莱茵衣藻的两个纤毛运动数小时的仪器，研究了两个纤毛的行为差异，以确定它们在趋光性中的特定作用。将生物体固定在固定的微量移液器上，将睫状跳动的平面旋转到象限光电探测器的成像平面中。对各种时间频率的方波光图案的响应用于表征每个纤毛的响应。检查了八十一个细胞，显示出意想不到的不同反应范围。对于来自细胞体的线性和非线性信号，建议合理的公共信号。已经确定了三个独立的纤毛测量值：搏动频率，搏动速度和两个纤毛的相位。细胞体向纤毛传达细胞想要移动的趋光方向，绝对光强度以及用于跟踪光源的适当渐变瞬态响应。每种睫毛反应量度所揭示的复杂性表明，净光战术反应涉及许多独立变量。尽管它们在形态上相似，但衣藻的两个纤毛却有独特的反应。来自细胞体的信号可能扇出纤毛中的独立途径。每个纤毛以自己的方式修改输入。已经证明了与负趋光性相关的每个纤毛的有效和恢复冲程模式的变化，并描述了其与趋光性转向有关。细胞动力。 Cytoskeleton 61：97-111，2005.（c）2005 Wiley-Liss，Inc.

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