Effects of Acetylcholine, Cytochalasin B and Amiprophos-methyl on Phloem Transport in Radish (Raphanus sativas) Explaining the “Pulse of Protoplasm”: The search for molecular mechanisms of protoplasmic streaming Study on physiological characters of cold resistance of Cycas revoluta Fluorescence Microscopic Observations on the Distribution Patterns of Actin Filaments in the Cells of Developing Endosperm in Triticum aestivum Analysis of Cytoplasmic Ca2+ Levels in Carrot and Its Callus Assembly of the Protoplasm of Codium fragile (Bryopsidales, Chlorophyta) into New Protoplasts