Biomedical subjects
Publications and source records attributed to S Zdravković.
In this paper we investigate the nonlinear dynamics of a DNA chain in the presence of endogenous AC fields (EACF) generated by the living cell itself. The dynamics of the DNA chain is described in the framework of the nonlinear breather mode. The transition of breather localized modes into open states, affected by AC fields is calculated by using Kubo's formalism for the linear response of the system.
In this paper we investigate the influence of endogeneous AC fields, generated by a living cell itself, on DNA dynamics. Both quantum nonlinear vibron-phonon interaction model and a model of a highly localized excitation are used. The transition of a broad solitonic excitation into a highly localized one affected by AC fields is calculated using Kubo's formalism for linear response of the system.
Epidemiological characteristics of gastric cancer in the province of Vojvodina were analyzed on the basis of official data of the Cancer Registry of Vojvodina and the records of the Bureau of Census of Vojvodina for the years 1982-1991. In the year 1991, the cases of gastric cancer accounted for 7.8% of all malignant neoplasms in males, ranking thus third, whereas in females, with 5%, it was in seventh place. At the same time, in the structure of deaths from malignant neoplasms, gastric cancer was on the second place both in males (9.1%) and females (7.8%). The male/female gastric cancer mortality ratio was 1.7:1. Incidence and mortality rates showed the tendency of a slow but steady decrease in both sexes during the observation period. The age-standardized incidence rate (world population) was 25.9 per 100,000 for men and 9.4 for women in average. In comparison with the corresponding data of the registries of Europe and of the world, Vojvodina falls in the range of moderately high rates. The age-specific incidence and mortality rates show a strong increase after the age of 55, reaching the highest values in the ages 75-79. Thus it can be said that gastric cancer is a disease of the elderly. Total five-year survival is low, which is a common observation for this kind of neoplasm.