Abstract: A vibration damping floor structure for reducing vibrations and shocks applied to a building. The vibration damping floor structure includes a frame structure formed by connecting a plurality of frames, a plurality of ball bearing supports formed on predetermined locations of the frame structure, and a plurality of ball bearings formed on each ball bearing support. Each bearing support is structured so that all of the ball bearings can contact the floor by adjusting the height and following the inclination of the floor.

Abstract: A vibration damping floor structure for reducing vibrations and shocks applied to a building. The vibration damping floor structure includes a frame structure formed by connecting a plurality of frames, a plurality of ball bearing supports formed on predetermined locations of the frame structure, and a plurality of ball bearings formed on each ball bearing support. Each of the bearing support includes means for following an inclination of a floor surface of the building and means for adjusting height, thereby contacting all of the ball bearings with the floor surface of the building.

Abstract: The present invention relates to a method for treating diseases of periodontal tissue by administering a basic fibroblast growth factor, by which the tissue injury is treated to induce regeneration, curing or new attachment.

Abstract: An isolaton floor system for accommodating the effects of an earthquake generally comprises a supporting floor and an isolation floor supported upon the supporting floor so as to be movable in at least one of the vertical and horizontal directions. A damper is interposed between the supporting floor and the isolation floor along the moving direction of the isolation floor. The relative displacement between both of the floors is adjusted by means of a lever or a pulley means to which springs are connected and which is operatively connected to the damper. A relative displacement direction changing mechanism may be further incorporated within the isolation floor system. A laminated rubber member provided with a predetermined shearing resistance is utilized for the damper. Any vibration caused by means of the earthquake is absorbed by means of the damper and the entire structure of the isolation floor system is prevented from being vibrated.