title: Contraction of protoplasm. I. Cinematographic analysis of the anodally stimulated contraction of Spirostomum ambiguum.
mesh_terms: D000818:Animals; D002118:Calcium / Q000494:pharmacology*; D016798:Ciliophora; D003470:Culture Media; D003593:Cytoplasm / Q000502:physiology*; D004558:Electric Stimulation; D007477:Ions; D009040:Motion Pictures; D009119:Muscle Contraction; D009132:Muscles / Q000502:physiology; D010781:Photography; D011188:Potassium / Q000494:pharmacology*; D014882:Water-Electrolyte Balance
chemical_list: D003470:Culture Media; D007477:Ions; D011188:Potassium; D002118:Calcium