title: Effects of the absence of extracellular Ca++ ions on negative and positive staircase phenomena in isolated muscle fibres of the frog.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism / Q000502:physiology*; D004558:Electric Stimulation; D009119:Muscle Contraction; D009132:Muscles / Q000378:metabolism*; D009210:Myofibrils / Q000378:metabolism / Q000502:physiology; D011893:Rana esculenta
chemical_list: D002118:Calcium