Little-known aspect of Theodor Billroth's work: his contribution to musical theory.

Theodor Billroth's contribution to musical theory is discussed and evaluated. Billroth was a close friend of the composer Johannes Brahms and was himself extremely musical. At his death he left the manuscript of a book on musical theory, Wer ist-Musikalisch?, which had gone through four editions by 1912.

[Ileal and appendicular endometriosis (author's transl)].

A bibliographical review it's been made on the base of a double rara localization of endometriosis: ileal and appendicular, marking the diagnostic difficulties found appendicular, marking the diagnostic-difficulties found before and after surgery, emphasizing the interest of the histological integrity and motivity of intestinal mucosa.

[Molecular biological aspects of oncogenesis caused by RNA tumor viruses (author's transl)].

This article concerns the molecular mechanisms by which RNA tumor viruses, commonly called as oncornaviruses, transfer their genetic information from the genomic RNA (70 s RNA) of the virions to the cellular DNA, leading to neoplastic transformations. The article describes biochemical and serological properties of reverse transcriptase, its role in the life cycle of RNA tumor viruses and broader implications to molecular biology. In this connection, the authors report their own findings on the role of reverse transcriptase in a preleukemic disease, myelofibrosis.