Effect of intraoperative heparin administration on some indices of the blood coagulatory-lytic system in the ischemic region of the small intestine with anastomosis.

Several parameters of blood coagulation-lytic system were estimated in an ischemic region of narrow intestine with anastomosis in absence of heparin therapy and after subcutaneous intraoperative heparin administration. Single heparin injection in high therapeutic doses (200 U/kg body weight) during the fi nal stage of surgery prevents not only thrombosis of mesenteric blood vessels, but to a certain extent intraperitoneal adhesions.

CF2Cl2 decomposition over nanocrystalline MgO: evidence for long induction periods.

CF(2)Cl(2) has been found to react with nanoscale MgO at 325 degrees C and higher temperatures. In excess of the halocarbon, the reaction results in the formation of MgF(2) as a predominant solid product, with CCl(4), and CO(2) formed as the main gaseous products. The kinetics of the process is characterized by a prolonged induction period, which is as long as 8.

Decontamination of gaseous acetaldehyde over CoOx-loaded SiO2 xerogels under ambient, dark conditions.

A series of CoO(x)-doped silica xerogels with various Co(2+) loadings (Co/Si = 0, 1, 2, 4, 6, and 10 mol %) has been prepared. All xerogels exhibit large (800-1050 m(2)/g) surface areas. Narrow pore size distributions with pore size maxima around 3 nm are characteristic for Co/Si = 1, 2, 4, 6, 10 samples.

Structural defects cause TiO2-based photocatalysts to be active in visible light.

Oxidation of TiO or Ti2O3 led to the formation of TiO2 with activity in visible light much higher than when TiN was used as a precursor, pointing out the importance of oxygen defects/vacancies for extension of activity of TiO2 into the visible region.

Influence of solution composition and ultrasonic treatment on optical spectra of TiO2 aqueous suspensions.

Investigation of TiO(2) aqueous suspensions has shown that their optical spectra can be unstable, with instability not related to precipitation or adherence of TiO(2) particles to the vessel walls. Increase of ionic strength of the suspension as well as neutralization of charged TiO(2) particles via pH adjustment accelerates the optical density drop. Vice versa, increasing the charge of TiO(2) particles via shifting pH in acidic or basic directions stabilizes the suspension's optical spectra, and ultrasonic treatment promotes optical density recovery.