Comparison of Structure and Conductivity of Multiwall Carbon Nanotubes Obtained over Ni and Ni/Fe Catalysts

Multiwall carbon nanotubes (MWNT) were produced by pyrolysis of acetonitrile (CH₃CN) on metallic particles of Ni and Ni/Fe at 850°C. The special program for statistical treatment of electron micrograph images was developed. Research of diameter distribution of MWNT grown over different catalysts was carried out. Two kinds of carbon nanotubes with different diameter and microstructure are formed on Ni catalyst. The MWNT with smaller diameter and cylindrical packing of layers were found to have the higher conductivity.     

Molsidomine and isosorbide dinitrate: a comparative trial of tolerance in long-term intake by IHD patients with stable angina of effort

Potential tolerance to isosorbide dinitrate (ID) and molsidomine (M) was studied in 18 ischemic heart disease (IHD) patients with stable angina of effort entered in a double blind cross-over trial. Each drug was administered for 3 weeks 4 times a day in individual effective dose. Single doses of ID and M were similar by effectiveness, but after 3 weeks of regular intake their efficacy fell, ID becoming less potent than M. For ID, tolerance after long-term intake manifested in 7 out of 18 patients, for M--in 5 out of 18. Complete tolerance was registered in 3 of 18 and 1 of 18 patients, respectively. Thus, tolerance is possible for the two drugs, but for M it is less pronounced.     

The participation of chloride and sodium channels in the realization of the effects of superhigh-frequency electromagnetic fields in the centimeter range on the active transport of sodium ions across the cell membrane

The main reason institutions reuse single use medical devices is to save money. Most hospitals are reusing disposables in varying degrees, but few have thoroughly investigated the issues surrounding reuse. Are there true savings to be realized? What are the risks to patients and coworkers? What are the legal and liability hazards to our employers and to ourselves? Professional nurses have a responsibility as patient advocates and employees to question the validity of the reuse of medical devices which are manufactured to be used only once. By reusing disposables are we really cutting costs, or are we cutting corners?     

The clinico-morphological characteristics and expert assessment of intracranial parenchymatous hemorrhages in craniocerebral trauma]

The authors analyze the clinical and morphological manifestations of brain hemorrhages occurring in craniocerebral injuries in various periods after the trauma. Specific features in the diagnosis of various types of hemispheric and stem hemorrhages, quantitative parameters (involvement indexes), and the fundamentals of expert evaluation are presented, based on the comprehensive topographic and anatomical, pathomorphological, morphometric, statistical, and other studies.