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Journal of Cell Science, Vol 22, Issue 3 633-643, Copyright © 1976 by Company of Biologists

JOURNAL ARTICLES

Cytoplasmic streaming in Chara corallina studied by laser light scattering

DB Sattelle and PB Buchan

An apparatus is described by means of which the power versus frequency spectrum of the photomultiplier current can be obtained for laser light scattered by streaming cytoplasm in the algal cell Chara corallina. A Doppler peak is noted in the spectrum which is abolished when cytoplasmic streaming is arrested by electrical stimulation. For 5 cells of Chara, this simple laser-Doppler velocimeter gave streaming velocities (46-7 mum s-1, S.D. +/- 4-8 at 20 degrees C) similar to those obtained for the same cells using the light microscope (44-3 mum s-1, S.D. +/- 5-3 at 20 degrees C). A narrow distribution of streaming velocities is indicated. The technique described provides a rapid, quantitative assay of the in vivo rheological properties of cytoplasm.


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B Kachar
Direct visualization of organelle movement along actin filaments dissociated from characean algae
Science, March 15, 1985; 227(4692): 1355 - 1357.
[Abstract] [PDF]


© The Company of Biologists Ltd 1976