[Errors and difficulties in the x-ray diagnosis of osteogenic sarcoma of the long tubular bones].

In some cases radiodiagnosis of osteogenic sarcoma is associated with some difficulties resulting from a variety of its x-ray picture. The main factor that influences the x-ray manifestations of osteogenic sarcoma, is a neoplastic bone formation which reflects the morphological essence of this tumor. Other signs depend on a tumor site in one or another anatomical part of the tubular bone, on rates and type ot tumor growth.

Survival and multiplication of Legionella pneumophila in municipal drinking water systems.

Studies were conducted to investigate the survival and multiplication of Legionella spp. in public drinking water supplies. An attempt was made, over a period of several years, to isolate legionellae from a municipal system.