[Small-size betatron for electron therapy of surface tumors and its clinical evaluation]. / Malogabaritnyi betatron dlia élektronnoi terapii poverkhnostnykh opukholei i ego klinicheskaia aprobatsiia.

The paper is concerned with the physicotechnical characteristics of a small-size betatron (with the energy of 7 MeV) designed in the Tomsk Polytechnical Institute for therapy of patients with superficial malignant tumors. An electron beam with the energy of 7 MeV was produced on the small-size betatron, irradiation fields were formed, and absorbed dose distribution was studied. The efficacy of the use of the beam in 110 patients with superficial malignant tumors was analyzed. The use of electron beam radiation was found promising for therapy of patients with locally spread types of skin and lower lip cancers and breast cancer local recurrences. Complete tumor regression was noted in 75-90% of the patients. Intraoral cone electron therapy combined with 60Co-therapy of surgery was employed for early cancer of the oral cavity.

[New species of parasitic infusoria of the family Urceolariidae]. / Novye vidy paraziticheskikh infuzorii semeistva Urceolariidae.

Three new species of Ciliata of the family Urceolariidae were found as follows: Paratrichodina voikarensis sp. n. on the gills of Coregonus nasus and C. peled; P. uralensis sp. n. on the gills of the sterlet and Trichodina percae sp. n. in the nasal cavities of the perch. Figures and descriptions of the new species are given.

[Tetraonchus alaskensis Price, 1937 and its epizootic role]. / Tetraonchus alaskensis Price, 1937 i ego epizooticheskoe znachenie.

Mortality of pelyad (Coregonus peled) caused by Tetraonchus alaskensis took place in winter 1973 in the Voikara and Syn rivers (the Ural tributaries of the Lower Ob) during anadromous and catadromous migrations. The highest infection rate was observed in older fished. Up to 2330 specimens of the parasite were recorded from the gills of one pelyad. A low infection rate with T. alaskensis was recorded from Coregonus nasus, C. lavaretus pidgian and Stenodu. The mortality coincided with the period of the greatest abundance of the Ob pelyard stock.