Optimal conditions for erythromycin sorption on supercoupled isoporous Purolight sorbents (styrosorbs) S-106, S-150 and S-160 and on macroporous sulfocation exchanger KU-23 were determined. High selectivity of erythromycin sorption on the supercoupled isoporous cation exchanger S-106 was shown, that was evident from the high distribution coefficient. The effective diffusion coefficient on the cation exchanger S-106 was higher by a factor of 10² (1.1X10^-11 m²/s) that was in favour of a comparatively high diffusion rate.

Production of labeled translam from a marine mollusk was provided by the use 1,3-β-D-glucanase. The pharmacokinetics of the¹⁴C-translam metabolism in the experimental rats by the accumulation level and the retention time in the organs and tissue and the excretion rate with the feces and urine was of the same character as that of carbohydrates and in particular that of glucose, whereas the excretion of translam mainly with the urine was likely evident of its incomplete hydrolysis after the intramuscular administration.

A novel strain of Photorhabdus luminescens ZMI isolated from nematode larvae Heterorhabditis sp. was shown to produce antibiotic complexes with antibacterial and antifungal activities. The antibiotic complexes secreted extracellularly and intracellarly were separated into individual components. Comparison of their properties with the databases for biologically active compounds suggested that component A was identical to 3,5-dihydroxy-4-isopropylstilbene, components B and H belonged to anthraquinone derivatives, component C secreted only extracellularly was likely a novel antibiotic.

Investigation of the efficacy of ribavirin against the West Nile virus in standard cell cultures showed that in high concentrations it inhibited the virus reproduction (the inhibition coefficient of 100%). In the experiments on albino mice infected with the West Nile virus in a dose of 10 LD₅₀ ribavirin was used in the form of injections in a dose of 20 mg/kg for 7 days in the scheme of urgent prophylaxis and proved to be highly efficient in protection of the animals from death (85-percent survival).

The hepatoprotective action of Hepatophyt was studied on Wistar rats with experimental hepatitis caused by exposure of the animals to tetracycline. Hepatophyt was administered per os in a dose of 0.1 g/kg. Its significant pharmacotherapeutic action was due to the content of biologically active substances, mainly of polyphenol nature. As natural antioxidants, they provided stabilization of the biomembranes and increased the energetic potential of the hepatic cells and the contractile capacity of the pericanal microfilaments, thus stimulating the synthesis and transport of the cholates and excretion of bilirubin and cholesterol with bile.

The species pattern and antibiotic resistance of gramnegative isolates from patients with nosocomial infections in Minsk ICUs were studied. Pseudomonas aeruginosa, Acinetobacter baumannii, Klebsiella pneumoniae and Escherichia coli were the main pathogens, highly resistant to the antibiotics used. Imipenem, meropenem, polymyxin B, ampicillin/sulbactam, amikacin and cefoperazone/sulbactam were the most active antimicrobials against the isolates. The choice of antimicrobials for empirical therapy of hospital infections in ICUs should be based on the local situation regarding the antibiotic resistance, that makes it obligatory to use regular microbiological monitoring in all hospitals thus providing the policy of the use of antimicrobials in ICUs.

Тhе review deals with investigation of the mechanism of action of macrolide pentaene antibiotic fllipin on cell and bilayer lipid membranes (BLM). The sterol hypothesis of the fillpin mechanism of action is confirmed experimentally. The hemolytic and genetico-cytological action of filipin, its action on virus infection and prion protein-associated diseases are discussed. The data on the mechanism of filipin action on BLM are presented. Filipin single ionic channels with conductance of 15-20 pS that is 3-4 times higher than that of the amphotericin channels were detected on cholesterol-containing membranes in filipin low concentration (1 • 10^-8 M) aqueous salt solution. Combined ionic channels of filipin and amphotericin B with conductance of 25-30 pS, that is 1.5-2 time lower than that of the clean filipin channels and 5 times higher that of the clean amphotericin B channels were also detected. The selectivity of filipin channels is mainly cationic. The potential of the penetrating ion on 10-fold gradient is +18 mV. The practical aspects of filipin application in biology, medicine and pharmacology are indicated.