Dextran coatings for aggregation control of layer-by-layer assembled polyelectrolyte microcapsules.

We propose dextran and dextran polyaldehyde (DPA) coatings for modification of layer-by-layer (LbL) assembled polyelectrolyte microcapsules which provide stability against aggregation in 0.75 M aqueous solutions of mono- and bivalent ions (Na(+), Cl(-), Ca(2+), HPO(4)(2-)). The microcapsules were prepared of three bilayers of poly(4-styrenesulfonate) (PSS) and poly(allylamine) (PAH).

Lateral versus perpendicular segregation in mixed polymer brushes.

Grafting of incompatible polymers on a substrate prevents macrophase separation and the chains self-assemble laterally. Mixed brushes are exposed to different solvents and the morphology is observed via atomic force and x-ray photoemission microscopy. In a nonselective solvent the different species segregate into parallel cylinders ("ripple structure").

[Value of roentgenological embolization of the splenic artery in the complex treatment of liver cirrhosis].

The authors share their experience with splenectomy, spleen artery ligation and its roentgen embolization in 110 patients with liver cirrhosis. Advantages of embolization ++ under roentgenological control are proved for the correction of hypersplenism, in preparing the patients to operations on the liver with using the methods of stimulation of reparative regeneration.

[Surgical treatment of papillo- and duodenopancreatitis].

Variants and results of the surgical treatment of 50 patients are presented. In 25 of them the pathology of the pancreas was due to the altered function of the major duodenal papilla, 19 patients had dysfunction of the duodenum and in 6 cases only it was of primary character. Transplantation of the common bile duct was performed in papillopancreatitis, in duodenopancreatitis--the duodenum was by-passed for the food passage.