Abstract: AIDS therapeutic agents are provided which are less toxic, have a strong anti-AIDS virus activity and comprise as an effective ingredient a dehydrogenation polymer of a cinnamic acid derivative having a phenyl group substituted with at least one hydroxyl group or a pharmaceutically acceptable salt thereof.

Abstract: Polymers of p-hydroxylated cinnamic acids and p-hydroxylated cinnamyl alcohols have potent anti-viral activity in vitro.

Abstract: Anti-HIV agent containing as active components alkaline water extracts of pine cone and method for producing high molecular weight substance having anti-HIV activity.

Abstract: An objective lens has a positive first lens disposed at a position most distant from an object surface, a meniscus-shaped second lens disposed on the object side of the first lens and having its convex surface facing the object side, and a positive third lens disposed on the object side of the second lens. The objective lens satisfies the following conditions:0.9<.vertline.r.sub.4 .vertline./f<25-0.45<f/f.sub.2 <0.02d.sub.4 /f<0.18where f is the total focal length of the entire system, r.sub.4 is the radius of curvature of the surface of the second lens which is adjacent to the object side, f.sub.2 is the focal length of the second lens, and d.sub.4 is the spacing between the second lens and the third lens.

Abstract: A beam splitter extracts a light beam from light passing through a picture-taking lens system, and a viewfinder optical system directs the light beam to a viewfinder eyepiece. The optical system includes a focus screen, a master lens for imaging the light beam on the focus screen, a pentaroof prism disposed between the master lens and the focus screen, and an eyepiece for observing therethrough the image on the focus screen.

Abstract: A device for providing an illumination of an object includes first and second optical integrators disposed on an optical axis in spaced-apart relationship. Light rays emitted from a point light source formed by an elliptical reflector mirror having a light-emitting source are incident on the first optical integrator, which forms a plurality of secondary images of the point light source. The second optical integrator receives luminous fluxes emitted from the secondary light source images to form a multiplicity of secondary images of the secondary light source images formed by the first optical integrator. Luminous fluxes from the secondary images formed by the second optical integrator are superimposed by a condenser lens on the object for illuminating the latter with light beams of uniform intensity.

Abstract: A zoom lens provided with a first group lens having a negative power and a second group lens having a positive power, the first group lens being moved in the direction of the optical axis for focus adjustment, the first group lens and the second group lens being moved in the direction of the optical axis for zooming, includes means for detecting the focused condition of the zoom lens to an object, the detecting means including optical means for receiving a light beam from the object which is discrete from a light beam incident on the zoom lens, and means for making an output signal representative of the focused condition from the light beam passed through the optical means, and means for integrally supporting the detecting means and the first group lens for conjoint movement in the direction of the optical axis.

Abstract: A zoom lens comprises a magnification changing system and a relay lens system succeeding the magnification changing system. The magnification changing system comprises, in succession from the object side, a first group as a focusing portion having a positive refractive power, a second group as a variator portion having a negative refractive power and movable along the optical axis to thereby change chiefly the focal length, and a third group as a compensator portion having a negative refractive power and maintaining the image plane fluctuated by movement of the variator portion at a predetermined position. The relay lens system comprises a fourth group as a forward relay system group having a positive refractive power and a fifth group as a rearward relay system group having a positive refractive power. The fourth group has three positive lens components of which at least the middle lens component is a cemented lens component having a convex cemented surface in the direction of the image side.

Abstract: A method of leukemia or leukemoid disease treatment by administration of a vitamin D derivative with a hydroxyl group at 1.alpha.-position is disclosed. It is believed that the vitamin D derivative with a hydroxyl group at 1.alpha.-position is capable of treating cancer through redifferentiation of cancer cells and that this capability is inherent in vitamin D derivatives with a hydroxyl group at 1.alpha.-position.

Abstract: A connector casing offering advantages in reducing the number of parts, at simplification of assembly and at reorganization and integration of parts management. According to this invention, there is provided a connector casing made of flexible synthetic resin and molded in one piece in rectangular box-like form. The casing has a top and a bottom hinged together at one rear edge thereof by a pair of hinge planes also integral with the casing. A front wall of the top and bottom have mating arched indentations to provide a cable opening when the casing is closed. Snap lock means are provided on the front walls and along each side of the top and bottom. Each side wall has a connector support near the rear. A rectangular opening is provided at the rear between the hinge planes to accommodate connection to a connector held in the casing. The casing will also accept flat cables and will accommodate metal cord holders about the cord.

Abstract: A device for providing an illumination of an object includes first and second optical integrators disposed on an optical axis in spaced-apart relationship. Light rays emitted from a point light source formed by an elliptical reflector mirror having a light-emitting source are incident on the first optical integrator, which forms a plurality of secondary images of the point light source. The second optical integrator receives luminous fluxes emitted from the secondary light source images to form a multiplicity of secondary images of the secondary light source images formed by the first optical integrator. Luminous fluxes from the secondary images formed by the second optical integrator are superimposed by a condenser lens on the object for illuminating the latter with light beams of uniform intensity.