Imaging-Guided Delivery of a Hydrophilic Drug to Eukaryotic Cells Based on Its Hydrophobic Ion Pairing with Poly(hexamethylene guanidine) in a Maleated Chitosan Carrier.

Imaging-guided delivery is developed for hydrophobic drugs, and to a much lesser extent, hydrophilic ones. In this work we have designed a novel strategy for real-time monitoring of hydrophilic drug delivery. Traditionally, the drug and the dye are covalently attached to a nanocarrier or are electrostatically adsorbed.

Chitosan-based multi-liposomal complexes: Synthesis, biodegradability and cytotoxicity.

Anionic liposomes were electrostatically adsorbed onto the surface of cationic chitosan particles cross-linked by sulfate anions, forming multi-liposomal containers (MLCs) for encapsulation and delivery of bioactive substances. An increase in molecular mass of chitosan from 30 to 300 kDa results in a size increase of chitosan particles, from 200 to 400 nm. Being saturated by liposomes, chitosan particles give MLCs of 320-540 nm.

Intracellular delivery of drugs by chitosan-based multi-liposomal complexes.

Positively charged linear chitosan molecules were cross-linked with sulfate-anions to form chitosan nanoparticles which were used as a scaffold of negatively charged cardiolipin/egg lecithin liposomes loaded with doxorubicin (DOX). Thus formed multi-liposomal complexes (MLCs) containing 55 liposomes/chitosan and bearing a slight positive net charge effectively transmitted DOX into the cytoplasm of cells in culture. The efficiency of DOX delivery increased 4-5-fold upon drug incorporation in MLCs.

[Organization and results of surgical care for ulcerative gastroduodenal bleeding in the hospitals of Central Federal District].

Aim: To present treatment of 52 149 patients with ulcerative gastroduodenal bleeding (UGDB) who were treated in different regions of Central Federal District (CFD) for the period 2011-2014. It is noted that UGDB incidence per 100 thousands is increased proportionally from 32.9 to 77.

[The ways to improve the efficiency of surgical care service].

Aim: To examine the work of surgical service in the Central Federal District and to define the main directions to improve the efficacy of surgical care in case of acute abdominal diseases.

Material And Methods: The results of surgical service of the Central Federal District for the period 2011-2014 in treatment of 2.5 millions patients were analyzed.