Alexandra Kravets

EDUCATION

AWARDS, PROFESSIONAL AND LEARNED SOCIETIES WORK EXPERIENCE

Total scientific experience 23 years, environmental chemo- and radioecological - 16 years.

There were more than 100 papers published, including 80 on the problem of Chernobyl NPP accident chemo- and radioecology, and 2 monograph.The main area of the last years scientific interests is the investigation of the effects of soil-plant relationship and their influence on the intensity’s radionuclide absorption by plant being a beginning link of food chains and estimation of consequences of use of the agrocenosås polluted with 137Cs and 90Sr.

Mechanisms, which determine dynamics and variability of soil-plant transfer factors under conditions of heterogeneity of pollutant forms of Chernobyl fallouts, have been investigated.

For the first time it was shown that root excretion of higher plant increase the rate of destruction of insoluble forms of radionuclides («hot» particles) and enhance their leaching from solid matrix. It was demonstrated that this ability of alive organisms was connected with genetic property as well as functional state. The rate of the biotic destruction of «hot» particle had been estimated. For the first time physiological nature of plant attractive ability and “capacity” of radionuclides accumulation had been investigated.

Results of these investigations demonstrated that cation exchange capacity (CEC) of plant tissues is one of the main physiological characteristics which determine the level of radionuclide accumulation. On the other hand, CEC is flexibly controlled characteristic and reflects delicately the functional state of the plant organisms and variation of the level of the radionuclide accumulation. These findings suggest that there are complex physiological processes which matter much for the pollutant migration in the system soil-plant and can determine intensity of their flows. Consequently this ability of higher plants may be used in development of biotic approach for optimization of pollutant flows in system soil-plant.

The three–module ecological model of assessment of radiological consequences (EMARC) of use of polluted agrocenoses had been developed. Model takes into account: transformation of bioavailability of radionuclides and long-term forecast of dynamics of soil-plant transfer factor; features of migration 137Cs and 90Sr in system “soil-plant” and natural clean–up of soil, inclusion and migration of radionuclides in food chains and coming in to human organisms. Estimations were conducted for agrocenosese of Northern Ukraine with six soil types. The obtained results demonstrate the considerable difference among the levels and dynamic formation of committed doses caused by consumption of the polluted food stuffs produced in agrocenosese with different types of soil. This difference can reach for both Cs and Sr one order and more.

EXPERIENCE. OF TEACHING

Total magistral experience is 10 years. T. Shevchenko Kiev National University (biogeochemistry of radionuclides, computation and mathematic methods of radiobiology) and Kiev Institute of Managment and Information Technology (radioecology and radiobiology).

LIST OF PUBLICATIONS

The list of main publications you can see here.