[Conversion of laparoscopic access in colorectal cancer surgery (in Russian only)].

Aim: To analyze the problem of access conversion in laparoscopic surgery for colorectal cancer.

Material And Methods: There were 876 procedures for colorectal cancer T14N01M0 performed at the Rostov Research Institute of Oncology in 2015-2017. Open and laparoscopic surgery was applied in 562 and 309 patients, respectively.

[Method of customized analysis of tension deformities in fixed dental restorations].

The paper presents the technique for transporting CT and CAD 3D-modelling data in software for tension deformities analysis with the possibility for customizing physical properties of certain anatomical structures and constructive materials. The obtained data allowed performing analyzing of tension deformities of dental restorations in ANSYS software.

Political model of social evolution.

Almost all democratic societies evolved socially and politically out of authoritarian and nondemocratic regimes. These changes not only altered the allocation of economic resources in society but also the structure of political power. In this paper, we develop a framework for studying the dynamics of political and social change.

[Study of corneal morphological changes and light scattering rate in keratoconus].

The paper gives the results of studying the rate of light scattering by different corneal layers in keratoconus from confocal microscopy data. The study was conducted using a Confoscan-4 confocal microscope (Nidek, Japan). The rate of light scattering was estimated from the results of analyzing the densitometric curve, by applying a Z-scanning system.

[Possibilities of compensation of optical aberrations in keratoconus with rigid gas-permeable contact lenses].

The paper gives the results of a study of ocular optical aberrations in keratoconus. Objective aberrometry was carried out with OPD Scan (Nidek, Japan). An additional computer program (OPD station) was used to evaluate the corneal wavefront.

[Aranoza -- a new Russian antineoplastic drug].

Myelosuppression is a toxicity-related limitation for aranoza dosage. The drug proved effective in the treatment of uterine sarcoma, cancer of the head and neck, breast, Hodgkin's disease and lymphosarcoma during stage II of clinical studies. Complete regression was reported in the treatment of melanoma (ca.