Biomedical subjects

A I Kovalev

Publications and source records attributed to A I Kovalev.

At least 19 recordsLinked to original sources

PubMed2000

Relationship between the 137Cs whole-body counting results and soil and food contamination in farms near Chernobyl.

We measured the radioactivity in the soil and child food samples from farms near Mogilev (56-270 GBq km(-2) 137Cs), Gomel (36-810 GBq km(-2) 137Cs), and Klincy (59-270 GBq km(-2) 137Cs), who had whole-body 137Cs counting results measured as part of a health examination in the Chernobyl Sasakawa Health and Medical Cooperation Project. Soil contamination on the family farm seems to be the main source of human contamination because most of the people in the area live on small farms and they and their domestic animals eat crops from the farms. A clear correlation was found between the children's whole-body 137Cs counting results and the radioactivity in their food (correlation coefficient: 0.76; confidence level of correlation: 3.2 x 10(-9)). There were also significant correlations between the whole-body 137Cs counting results and both the radioactivity of the soil samples (correlation coefficient: 0.22; confidence level of correlation: 0.0107) and the average contamination level of their current residence (correlation coefficient: 0.20; confidence level of correlation: 0.0174).

Cesium Radioisotopes↗

PubMed2000

Radiocesium in children residing in the western districts of the Bryansk Oblast from 1991-1996.

Measurements of 137Cs body burden were carried out in 1991-1996 for children residing in the western part of Bryansk Oblast (Russia) where area contamination with 137Cs following the Chernobyl accident varied from 0.03-3.7 MBq m(-2). The mean and median values of 137Cs specific activity (SA) in the bodies of children 5-15 y old for the whole period of surveillance averaged for 26,029 measurements was 85 Bq kg(-1) and 49 Bq kg(-1), respectively. Mean values in different places of residence varied from 30-342 Bq kg(-1) for the settlements where the number of examinees was not less than 50. There is a moderately strong relationship between mean SA in the settlement and the level of area contamination with 137Cs. A strong seasonal effect on 137Cs body burden was found. The ratio of average SA values is 1:1.75 for spring to autumn 1992-1995 in the settlement where the largest number of children was examined. This effect might be attributed to a seasonal change in diet. Based on questionnaire information on individual consumption of locally produced foods, the descending rank of contribution of food items to 137Cs intake by children was found to be: meat-mushrooms-milk-vegetables. Assuming that the dose distribution would follow the distribution of SA values, internal doses to the whole body from ingested 137Cs were assessed. The mean value of annual internal dose averaged for the whole set of measurements is 0.21 mSv, and the median of the individual dose distribution is 0.12 mSv y(-1) For 2% of the total sample the annual dose exceeded 1 mSv, with the highest individual dose being 9 mSv in 1994 for a 7-y-old girl.

Adolescent↗

PubMed1998

[Determination of antioxidative potential of biological fluids by using semiconductor chemical sensors].

A procedure has been developed for determining the concentrations of superoxide anion radical (SOAR) in aprotonic fluids by using semiconductor chemical sensors. SOAR life in pure solutions is 6.3 hours. Supplements of biological fluids (blood, urine, plasma) increase the rate of SOAR death. There is a great difference in the reaction rate of SOAR with biological fluids in apparently healthy and ill individuals. It is suggested that the above procedure opens vistas both for studies of vital activity and for diagnosis of abnormalities.

Body Fluids↗

PubMed1990

[Immunoreactive disorders and their correction in patients with rhegmatogenous retinal detachment complicated by vitreoretinal proliferation].

Examination of the immunologic state of 73 patients with rhegmatogenous retinal detachment complicated by vitreoretinal proliferation has revealed correlation between the severity of the latter and disturbances in the immune state of the patient's body. 44% of patients with the stage C and 62% of patients with the stage D have immunodeficiency expressed by reduced level of T- and B-lymphocytes and their subpopulation. It is shown that disturbances in immunoreactivity can serve as an unfavourable sign for prognosis of effectiveness of surgical intervention in patients with rhegmatogenous retinal detachment. In 70% of the patients these disturbances lead to unfavourable outcome of the operation. For normalization of the revealed disturbances in the immune state, immunomodulator thymaline was used in a complex treatment of 17 patients. The preparation rose the effectiveness of the treatment in 78% of patients and reduced the number of postoperative complications. It is recommended to study the immunologic state of the patient with rhegmatogenous retinal detachment complicated by vitreoretinal proliferation for the purpose of its further correction and a higher effectiveness of surgical treatment of such patients.

Adjuvants, Immunologic↗

PubMed1990