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Journal of Experimental Biology 42,537-544 (1965)
Published by Company of Biologists 1965

The Thermal Dependence of Flagellar Activity in Strigomonas Oncopelti

M. E. J. HOLWILL 1 and N. R. SILVESTER 1

1 Department of Physics, Queen Elizabeth College, London, W.8

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 ({Delta}H{ddagger}) of 15.4 kcal./mole and an activation entropy ({Delta}S{ddagger} of -1 e.u. {Delta}H{ddagger} is comparable with published data on cilia and glycerol-extracted sperm. Values of {Delta}S{ddagger} (-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.

Submitted on September 22, 1964






© The Company of Biologists Ltd 1965