Ultrastructure and Sliding of Pellicular Structures During Euglenoid Movement in Astasia longa Pringsheim (Sarcomastigophora, Euglenida)
Ultrastructure and Sliding of Pellicular Structures During Euglenoid Movement in Astasia longa Pringsheim (Sarcomastigophora, Euglenida)
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Astasia longa Pringsheim（肉鞭毛纲，Euglenida）眼虫运动过程中的超微结构和果膜结构的滑动
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
R. Williamson
中科院分区：
文献类型：
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作者：
T. Suzaki;R. Williamson
抽象的。细胞和孤立的膜片的精细结构与邻近的膜条之间的滑动有关，据信这些膜条伴随着钩骨的运动。超声作用破坏了沟槽区的膜的重复结构，在那里单宁酸固定解决了分离但重叠的膜条。所有微管(包括位于重叠条之间的两条)都保留在内条上。因此，我们认为这个断裂面定义了相邻的膜单位之间发生滑动的边界。与此一致的是，当细长的细胞四舍五入时，从凹槽到凹槽连接相邻单元的膜条的横丝从横向移位到倾斜。相反，在覆盖在单个单元上的脊质膜颗粒阵列中没有检测到暗示每个单元内扭曲的变化。这些结果与以前的超微结构研究、导致滑动的力产生的位置以及横穿细丝的作用进行了讨论。
ABSTRACT. The fine structure of cells and isolated pellicular sheets of Astasia longa is examined in relation to the sliding between neighboring pellicular strips believed to accompany euglenoid movement. Sonication breaks the repeating structure of the pellicle in the groove region where tannic acid fixation resolves separate but overlapping pellicular strips. All microtubules (including the two lying between the overlapping strips) remain with the inner strip. We therefore suggest that this fracture plane defines the boundary where sliding occurs between adjacent pellicular units. Consistent with this, traversing filaments running from groove to groove to connect the pellicular strips of adjacent units are displaced from transverse to oblique when elongated cells round up. In contrast, no changes suggestive of distortion within each unit are detected in the particle arrays of the ridge plasma membrane that overlies a single unit. The results are discussed in relation to previous ultrastructural studies, the site at which the force to cause sliding is generated, and the role of the traversing filaments.