The Thermal Dependence of Flagellar Activity in Strigomonas Oncopelti

The flagellar beat frequency of Strigomonas oncopelti was found by cinémicro-photography 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 — i 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 ratelimiting reaction between ions of like charge although the present value does not support this idea.