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The presence of unusual microtubular structures in senescent cells of Chlamydomonas dysosmos

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Abstract

Complexes of twisted ribbons composed of ordered arrays of microtubules are identified in close association with the plasmalemma and the surfaces of some organelles in senescent cells of photoheterotrophically cultured Chlamydomonas dysosmos. The ribbon complexes occur throughout the cytoplasm, and do not appear related to the flagellar insertions. The component microtubules are approximately 26 nm in width, exhibiting a center-to-center spacing of about 44 nm. Additional cytoplasmic microtubules are often closely related to the tubular complexes. A detailed description of their fine structure is presented here which tends to support the ascribed function of microtubules in maintaining the structural integrity of the protoplasm.

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Supported in part by NRC Operating Grant No. A5745 granted to Prof. T. Sawa, Department of Botany, University of Toronto.

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Silverberg, B.A. The presence of unusual microtubular structures in senescent cells of Chlamydomonas dysosmos . Arch. Microbiol. 98, 199–206 (1974). https://doi.org/10.1007/BF00425282

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