1) In the protoplasmic streaming of
Chara, we can see a difference between the flowing rate of upward streaming and that of downward streaming. This is true in respect to most of the endoplasm, except that which is in direct contact with the cortical gel. The rate of the latter streaming is not affected by gravity.
2) By means of a centrifuge-microscope, we find that the centripetal flow of the endoplasm stops under the influence of centrifugal acceleration amounting to 40×g. But the endoplasm adjacent to the cortical layer requires five times as much centrifugal acceleration as the above in order to be brought to a standstill.
3) The mechanism of the motive force generation exists only at the boundary region between the cortical gel and the endoplasm, and all the other portions of the endoplasm are thought to be passively driven by the force generated at this region.
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