Abstract
Protoplasmic streaming was investigated in several types of cells fromChara braunii, and the data were subjected to extensive theoretical analysis. The following results were obtained: 1. Streaming velocity is relatively insensitive to cell length if the length/diameter ratio of the cell exceeds five. 2. Most of the viscous loss engendered in the bulk endoplasm and sap is localized near the indifferent lines. 3. The streaming velocity of the bulk endoplasm is directly proportional to the square root of the cellular diameter, and the power input per unit area to the bulk endoplasm is—over a wide range of velocities—independent of velocity. 4. The streaming velocity varies linearly with the temperature, and it is in principle possible to use this variation to determine the temperature variations of both the power input to the bulk endoplasm and an effective viscosity for this endoplasm. Finally, the function of the streaming is considered and several possibilities are discussed.
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