[Indications and results of colostomy for anorectal malformations in girls].

On the basis of an analysis of 122 cases the authors present options on the strategy and methods of operations depending on the anatomical patterns, the degree of anorectal malformations and the type of coexisting pathology, the technique of placing unnatural anus. Preference is given to a one-stage surgical method, the indications to the graded treatment with the formation of colostomy are described in detail.

[A simplified model for kinetics of a tumor cells' population].

A mathematical model of solid tumor growth is suggested. The external influence from the tumor-bearing organism is described separately for cell growth and apoptosis. The model is an ordinary differential equation which provides for use of a variety of dependences for both processes.