New Titanium(IV)-Alkoxide Complexes Bearing Bidentate OO Ligand with the Camphyl Linker as Catalysts for High-Temperature Ethylene Polymerization and Ethylene/1-Octene Copolymerization.

In order to increase the thermal stability of olefin polymerization precatalysts, new titanium(IV) complexes with diolate ligands differing in the degree of steric hindrances were synthesized from readily available precursor (±)camphor. The structures of the complexes were established by X-ray diffraction. Complexes in the presence of an activator {EtAlCl + BuMg} catalyzed the synthesis of UHMWPE with an M up to 10 million and a productivity of up to 3300 kg/mol·atm·h.

Effect of Activator and Outgoing Ligand Nature on the Catalytic Behavior of Bis(phenoxy-imine) Ti(IV) Complexes in the Polymerization of Ethylene and Its Copolymerization with Higher Olefins.

A series of bis(phenoxy-imine) (FI) titanium(IV) and zirconium(IV) complexes have been synthesized. The effect of the nature of the activator (MAO, combinations EtAlCl + BuMg and iBuAl + [PhC][B(CF)]) on the catalytic activity and properties of the resulting polymers was studied. It was found that Ti-Fi complexes, despite the nature of the outgoing ligands (Cl or iPrO) in the presence of Al/Mg activators, effectively catalyze the polymerization of ethylene (with the formation of UHMWPE); copolymerization of ethylene with 1-octene (with the formation of ultra-high molecular weight copolymers); and the ternary copolymerization of ethylene, propylene and 5-vinyl-2-norbornene (with the formation of polyolefin elastomers).

[The influence of preoperative preparation on changes in haemodynamics in patients with pheochromocytoma].

The parameters of haemodynamics in 64 pheochromocytoma patients were studied by the "Centaur" technology using the methods of echocardiographic examinations, daily monitoring of arterial pressure and bioimpedance rheography. A comparative analysis of the character of hemodynamic derangements in pheochromocytoma patients at various stages of treatment depending on the quality of preoperative preparation was made. A reliable positive influence of selective alfa-adrenoblocks of the parameters of blood circulation in pheochromocytoma patients in the preoperative and intraoperative periods was revealed.

[Radiation and nonradiation factors in thyroid pathology development for Chernobyl cleanup workers--residents of Mayak PA affected zone].

Thyroid state study was been carried out for Chernobyl NPP accident liquidators living in Ozyorsk, the city, located in the nuclear facility affected zone (Mayak PA). In total 531 individuals were examined. Thyroid assessment was made basing on physical examination, on ultrasound study and on hormones measurement of thyroid stimulating hormone, free thyroxine and thyroid peroxidase antibody.

[On the choice of the material in surgical treatment of rectocele].

An investigation of the physical (capillaries, elasticity, strength, traumaticity) and implantation properties of modem synthetic absorbable suture material "Maxon 1", "Polysorb 1", "Vicryl 1" has shown considerable advantages of the monofilic thread "Maxon 1". For surgical treatment of anterior rectocele of the III degree (anterior levatoroplasty) this thread was used in 114 patients with good direct, nearest and long-term results.

Thyroid abnormalities associated with protracted childhood exposure to 131I from atmospheric emissions from the Mayak weapons facility in Russia.

Between 1948 and 1960, the Mayak nuclear weapons facility in Ozyorsk, Russia discharged relatively high levels of radionuclides, primarily (131)I, into the atmosphere, resulting in appreciable exposure to the residents of Ozyorsk. To evaluate the association between thyroid diseases and childhood exposure to radioiodines, we screened 894 Ozyorsk residents born between 1952 and 1953. The study population was comprised of 581 exposed individuals living in Ozyorsk during the years of heaviest exposure and 313 nonexposed individuals who moved to Ozyorsk when radiation exposure from Mayak largely had ended.

[The clinical-morphological estimation of the results of laser osteoperforation in treatment of chronic osteomyelitis].

The method of laser osteoperforation was approved in 135 patients with chronic osteomyelitis. The diode laser with wave length 970 mm and peak power up to 30 Wt was used. Energy was delivered by the percutaneous contact method with a quartz light guide of 0.

[Oxygen tension in would tissues during healing].

Transcutaneous strain of oxygen (TcPO2) was studied in tissues of 111 wounds in 110 patients. The uncomplicated course of the wound process was characterized by rapid normalization of the initially decreased TcPO2 in the wounds closed with sutures or in case of gradual approximation of their margins as well as by a slow elevation when the wounds were healing by second intention. High significance of measuring TcPO2 was shown for diagnosis of acute pyo-inflammatory diseases and wound complications.

[Percutaneous laser-induced thermotherapy of nodular goiter].

Substantiation of use of laser radiation Nd:YAG (1064 nm) and diode (805 nm) for destruction of thyroid tissue was the purpose of this study based on experimental research of reparative and adaptive processes in thyroid gland. The influence of high-intensity laser radiation was studied in vivo in thyroid gland of 41 dogs. The optimal modes of laser radiation ensured focal destruction of thyroid gland without damage of surrounding organs were selected.

[An experimental model of suppurative osteomyelitis].

A new experimental rabbit model of acute purulent osteomyelitis is proposed. The model is reproduced by percutaneous introduction of 4 million St. aureus microorganisms into the medullary channel of the femoral bone after aseptic destruction of the bone marrow by ethyl alcohol and hot saline.

[Stimulation of medical personnel work in operating rooms].

Preliminary results of experimental trial on stimulation of medical staff's labour in the operation unit, held in medical institutions of Chelyabinsk, has been analysed. As a basis for calculation of the payments for the work, the labour expenditures of each member of surgical team (surgeon, assistant, anesthesiologist, surgical nurse, anesthesist, litter bearer nurse) and the cost of 1 hour work were assessed, the degree of the difficulty of each operation, as well as the total cost of the procedure was determined. Registration of the work of all members of the surgical team and its payment, according to the quantity and the quality of the performed operations, demonstrates the stage of transition to the system of payment for the labour, i.

[Surgical management of acute cholecystitis in elderly and old age patients].

Results of treatment of 233 old and elderly patients with acute cholecystitis were analysed. In 206 from them percutaneous transhepatic drainage of the gallbladder (PTDGB) was carried out under US control with creation of temporary microcholecystostoma for elimination of acute attack of cholecystitis by decompression of the biliary system, in 2 patients laparoscopic cholecystostomy was performed, and in 27 patients with choledocholithiasis and jaundice early endoscopic papillosphincterotomy was carried out. Elimination of acute attack of cholecystitis in early terms contributed much to improvement of the patients condition, to carrying out further examination and correction of concomitant diseases.

[Immunological reactivity and the HLA system antigens in patients with autoimmune thyroiditis and nodular euthyroid goiter].

Factors of nonspecific resistance, cellular and humoral immunity were investigated before operation in 84 patients with nodular euthyroid goiter and in 50 patients with autoimmune thyroiditis, 50 patients were investigated in the long-term postoperative period. Class I HLA antigens were investigated in 205 patients. Humoral changes of immune homeostasis (hyper-production of antithyroid antibodies, an increase in the level of IgM and IgG against a background of the raised number of peripheral blood B-cells, a decrease in the level of lysozyme), disorder of the cellular factor of immunity (specific sensitization of T-lymphocytes to thyroid antigens, a decrease in the number of T-lymphocytes, especially T-suppressors) were detected in autoimmune thyroiditis.

[Characteristics of thyroid cancer in combination with autoimmune thyroiditis].

Remote results of the surgical treatment of 413 patients with carcinoma of the thyroid gland without autoimmune changes and 199 patients with thyroid carcinoma associated with an autoimmune component were studied. Remote results of the surgical treatment and indices of survival in the second group of patients were found to be better than those in patients without autoimmune changes in the thyroid gland.