The flagellar beat frequency of Strigomonas oncopelti was found by cinémicrophotography at temperatures in the range 4-45° C. The thermal dependence is described by an activation enthalpy (ΔH‡) of 15.4 kcal./mole and an activation entropy (ΔS‡ of -1 e.u. ΔH‡ is comparable with published data on cilia and glycerol-extracted sperm. Values of ΔS‡ (-20 e.u.) deduced from the literature suggest a rate-limiting reaction between ions of like charge although the present value does not support this idea.
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