Abstract: There is disclosed an optical information recording/reproducing apparatus for recording/reproducing information on/from an optical card having a plurality of tracks. The apparatus comprises a frame having a convey path for the optical card, an optical head for recording/reproducing information on/from the optical card, the optical head being movable in a direction perpendicular to information tracks on the optical card, an moving mechanism for moving the optical card along the convey path relative to the optical head, and a detecting mechanism for detecting the amount of movement of the optical card. The detecting mechanism has two drive rollers which are put in contact with the optical card to rotate in accordance with the movement of the optical card.

Abstract: Novel compounds, called mureidomycins A, B, C and D, may be prepared by cultivation of a suitable microorganism of the genus Streptomyces, especially Streptomyces flavidovirens SANK 60486 (FERM P-8636, FERM BP-1347). These represent a wholly new class of antibiotics, which are valuable in the treatment of infections caused by a variety of bacteria, notably of the genus Pseudomonas.

Abstract: A process for improving the coefficient of traction between at least two relatively rotatable elements in a torque transmitting relationship, and traction drive fluid composition. This composition contains the hydrogenated product of a dimer, a trimer or a polymer having a degree of polymerization of more than 3 of a cyclic monoterpenoid monomer, and exhibits excellent traction performance over a wide temperature range from low temperature to high temperature.