[Clinico-morphological bases of the choice of surgical method in echinococcosis of the organs of the thoracic cavity].

The article deals with the treatment of 831 patients with echinococcosis of the lungs. It gives a clinico-morphological substantiation of surgical interventions in various conditions of the hydatid and in bilateral and multiple affection. Combined involvement of the heart, diaphragm, pleura is a casuistry.

[Oxidation of sulfide minerals by Thiobacillus ferrooxidans].

Samples of natural pyrites and sphalerites were subjected to the action of the mineral medium 9K with 1 g of Fe3+ per litre in the presence and in the absence of Thiobacillus ferrooxidans, and incubated at 28 degrees C under the stationary conditions for 30 days. The chemical composition of the solutions was studied after leaching as well as changes of the surfaces of monoliths. The deepest etching of surfaces with the formation of crusts and films of jarosite, limonite and goslarite occurs upon the combined action of bacteria and Fe3+ in regions of a fine-zonal structure enriched with an isomorphous arsenic admixture which are characterized by a defective weak structure.