[Preparation of Copper and Nickel from Metallurgical Waste Products with the Use of Acidophilic Chemolithotrophic Microorganisms].

The study concerns the leaching of copper, nickel, and cobalt from metallurgical production slag with trivalent iron sulphates prepared in the process of oxidation of bivalent iron ions with the use of associations of acidophilic chemolithotrophic microorganisms. At the same time, copper extraction in the solution reached 91.2%, nickel reached 74.

[Investigation of stages of chemical leaching and biooxidation during the extraction of gold from sulfide concentrates].

We examined the chemical leaching and biooxidation stages in a two-stage biooxidation process of an auriferous sulfide concentrate containing pyrrhotite, arsenopyrite and pyrite. Chemical leaching of the concentrate (slurry density at 200 g/L) by ferric sulfate biosolvent (initial concentration at 35.6 g/L), which was obtained by microbial oxidation of ferrous sulfate for 2 hours at 70°C at pH 1.

[Leaching of nonferrous metals from copper-smelting slag with acidophilic microorganisms].

The leaching process of copper and zinc from copper converter slag with sulphuric solutions of trivalent iron sulphate obtained using the association of acidophilic chemolithotrophic microorganisms was investigated. The best parameters of chemical leaching (temperature 70 degrees C, an initial concentration of trivalent iron in the leaching solution of 10.1 g/L, and a solid-phase content in the suspension of 10%) were selected.

[Bioregeneration of the solutions obtained during the leaching of nonferrous metals from waste slag by acidophilic microorganisms].

The bioregeneration of the solutions obtained after the leaching of copper and zinc from waste slag by sulfuric solutions of ferric sulfate is examined. For bioregeneration, associations of mesophilic and moderately thermqophilic acidophilic chemolithotrophic microorganisms were made. It has been shown that the complete oxidation of iron ions in solutions obtained after the leaching of nonferrous metals from waste slag is possible at a dilution of the pregnant solution with a nutrient medium.

[Biohydrometallurgical technology of a complex copper concentrate process].

Leaching of sulfide-oxidized copper concentrate of the Udokan deposit ore with a copper content of 37.4% was studied. In the course of treatment in a sulfuric acid solution with pH 1.

[Pharmacologic and cold therapy in severe chronic ischemia of the lower extremities].

It was demonstrated experimentally and in the clinic that pharmacocoid therapy applied before, during, and after operation produces a protective anti-ischemic and spasmolytic effect, prevents of reduces the intensity of reperfusion disorders, and allows the viability of the limb involved in severe chronic ischemia to be appraised.

[Qualification standards and their role in the evaluation of the level of professional skills of social hygienists and public health administrators].

Further increase in public health requirements specified by the scientific and technological progress raised the problem of objective appraisal of professional skills of social hygienists and public health administrators. The pattern of qualification references of social hygienists and public health administrators was proposed along with the examination requirements. Qualification references could be also used for the development of the curricula and educational programmes for social hygienists and public health administrators, for planning the demand for such specialists and their advanced training in the system of postgraduate medical education.

[Methods of pedagogical assessment of qualifications in postgraduate medical education].

The methods of pedagogical assessment of qualification in postgraduate medical education play a decisive role in assessing both the effectiveness of training and the level of professional competence of physicians. The methods of pedagogical assessment of qualification provide an opportunity to measure and evaluate each of the didactic categories--knowledge, professional competence, practical skills, professional credo. The described methods of assessing the knowledge, professional competence and practical skills can form an objective picture of the level of educational goals achieved (in the process of education) and determine whether the level of professional training of physicians meet professional requirements.

[Local hypothermia in the treatment of acute arterial occlusion of the extremities].

An experimental and clinical investigation of the possibility to use local hypothermia of the extremity in the complex treatment of its acute ischemia was performed. It was established that the local hypothermia could considerably improve tissue viability in the process of the extremity ischemia at the expense of spasmolytic, hypocoagulative, anesthetic effects and inhibition of metabolism. A conclusion is made that the local hypothermia should be used in the clinic for the improvement of results of treatment of patients with acute arterial obstruction of the lower extremities complicated by severe ischemia.