PMID: 1214109Jan 1, 1975Paper

Cinemicrographic analysis of the movement of flagellated bacteria. I. The ratio of the propulsive velocity to the frequency of bodily rotation

Journal of Mechanochemistry & Cell Motility
T YoshidaS Asakura

Abstract

On the basis of the hydrodynamic model that the propulsion of flagellated bacteria in a fluid is a consequence of the propagation of helical waves along the length of flagella or flagellar bundles, it is predicted that propulsion must be accompanied by a rotation of bacterial body about the direction of translation (Chwang and Wu, 1971), and that propulsive velocity u is directly proportional to the frequency of bodily rotation fB, the proportional constant being a complicated function of various parameters describing the sizes and shapes of body and flagella. In this study we have measured not only u but also fB by cinemicrography or sometimes by dual cinemicrography, using a mono- trichously flagellated Pseudomonas strain and a multitrichously flagellated Salmonella strain, and calculated the ratio u/fB. Though the values of u/fB thus determined for a number of bacteria of each strain scattered in a wide range, average values of u/fB were likely to be independent of u, in support of the theoretical prediction. Moreover, in Pseudomonas as well as in Salmonella, it was found that the experimental values of u/fB were in semiquantitative agreement with theoretical values expected from the hydrodynamic model for appropriate values...Continue Reading

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