Abstract
Results obtained from physiological analyses of constitutively observed cytoplasmic streaming in characean internodal cells and light-induced cytoplasmic streaming in Vallisneria mesophyll cells done by the centrifuge microscope of stroboscopic type were briefly summarized, touching recently revealed responsible motor proteins and endoplasmic reticulum structures. Special emphasis was placed on the putative cross bridges formed upon the cessation of cytoplasmic streaming in characean cells and on the mechanical properties of endoplasm.
