Abstract

The surface-active properties of myosin, actomyosin, F- and G-actin at the air-solvent interface, at initial bulk phase concentrations in the range of 10 − 4 % to 10 − 2 % w/v, were determined by the drop volume method. Overall myosin was the most effective surface tension depressor, followed by actomyosin, F-actin and G-actin. The surface pressures attained after 40 min at an initial bulk phase concentration of 10 − 2 % w/v were 21·02, 19·27, 17·25 and 14·91 mNm − 1 , respectively. Furthermore, myosin effected the most rapid change in surface pressure during the initial 5-min period.

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