[Quantitative evaluation of periodicity of cell movement in the process of aggregation].

A method of quantitative estimation of quasiperiodic cell movements is considered which allows to approximate the process under study by the sum of trigonometric functions. The possibilities of the method are deomonstrated in the analysis of cell and aggregate movement during the development of a sponge Ephydatia fluviatilis from dissociated cells, taken as an example. The spectral composition of the movement of cell aggregates was found to change with time; the high frequencies disappear gradualy and the lower ones appear.