[Verification of a decrease in the rigidity of the phage lambda DNA polymeric chain in low ionic strength aqueous solutions by testing the polymer-polymer interlink interactions].

Changes in the rigidity of the polymetric chain of phage lambda double-strand DNA have been studied by laser correlation spectroscopy. It was shown that, as the ionic strength increases, the effect of the screening of the hydrodynamic interaction of the links of the polymeric chain specific for polymeric coils arises in a DNA solution. It is assumed that the screening occurs when the threshold of the overlapping of DNA coils is achieved.

[Use of cephalosporins in pediatric practice with the study of the immunoleukolysis (leukocytolysis) reaction].

The aim of the study was to determine the value of preliminary assay of hypersensitivity to cephalosporin antibiotics such as cephazolin, cefuroxime and cefotaxime with the immunoleukolysis test (ILT). 130 children at the age of 2 months to 7 years treated with one of the antibiotics for various inflammatory diseases of the bronchopulmonary system were examined. Hypersensitivity (the ILT indices over 30 per cent) was observed in 9.