Abstract
The protoplasmic streaming in the internodal cell of Nitella flexilis was found to be slightly accelerated by the addition of ATP in adequate concentrations. Thus, in the most remarkable case, 1×10-3M ATP increased the rate of the streaming by 15% with a time-lag of 15 minutes. The accelerated rate was maintained for more than 50 minutes. With the removal of ATP, the rate went down within 10 minutes to the initial low level. AMP gave no discernible effect of acceleration on the rate of streaming in the cell.
