[Bronchoscopic diagnosis of central peribronchial lung cancer in silicosis and silicotuberculosis].

Examination of 315 lung cancer patients with silicosis or silicotuberculosis gave grounds for recognition of 3 variants of bronchial stenosis. The efficacy of bronchoscopic techniques was related both to anatomic variant of the tumor and primary tumor position against the involved bronchus lumen. Central peribronchial cancer in silicosis and silicotuberculosis has specific features: combination of true tumor stenosis with false rigidity of the trachea and large bronchi, advanced scar anthracotic deformity of the bronchi and diffuse atrophy of bronchial mucosa, distinctive pattern of metastatic spreading.

[Genetic control of alopecia in sheep].

A hypothesis is suggested which turns down the opinion that alopecia or pathological wool shedding in sheep is due to some pathological processes or disease. We suppose that this trait is controlled by a gene of natural wool shedding inherited from sheep far ancestors, and we propose to designate the recessive alopecia gene as Alp3 and its dominant allele, a wool alopecia resistance gene, as AlpA. Alopecia will only be revealed in homozygotic Alpa/Alpa state, due to recessivity of alopecia gene, but heterozygotic AlpA/Alpa and homozygotic AlpA/AlpA sheep will have a normal wool coat.