Abstract: An optical transmission system including an optical transmission device and an optical reception device that receives, via an optical transmission line, a signal transmitted from the optical transmission device, the optical transmission system including a transmission-mode selection unit that selects transmission mode information in descending order of priority out of transmission mode information, which is combinations of a plurality of parameters concerning transmission performance, the transmission mode information being a plurality of kinds of the transmission mode information common to the transmission performance of the optical transmission device and the optical reception device, a signal transmission unit that transmits, to the optical reception device, a signal modulated based on the selected transmission mode information, and a signal reception unit that receives the signal and modulates the received signal based on the transmission mode information selected by the transmission-mode selection unit.

Abstract: Dibenzosuberanyl piperazine derivatives represented by the following formula (I): wherein R represents an aliphatic hydrocarbon group, which may contain one or more heteroatom-containing substituent groups and may preferably contain 2 to 30 carbon atoms, and physiologically acceptable salts thereof; and medicinal compositions containing these dibenzosuberanyl piperazine derivatives and/or physiologically acceptable salts thereof. These compounds show effectiveness in allowing resistance-acquired causes of diseases to restore sensitivity to drug, that is, a resistance overcoming effect.

Abstract: Dibenzosuberanyl piperazine derivatives represented by the following formula (I): 1

Abstract: Disclosed herein is an antiprotozoal composition containing a 2-nitroimidazole derivative as its active component. This drug is especially useful against Trypanosoma cruzi. Process for the preparation is also disclosed.

Abstract: A polyester film for printed circuits to be used as a base in a printed circuit base plate or as a base and/or cover layer in a printed circuit board, which undergoes a degree of dimensional stability of not more than 1% in both the longitudinal and transverse directions when kept at 150.degree. C. for 30 minutes, and which is obtained by heat treating an extrusion molded and stretched polyester film at 150.degree. C. to 240.degree. C. without applying tension.