Abstract: In a medium fixing method of fixing one or a plurality of mediums on a shaft while the one or plurality of mediums each having a circular opening portion in a substantially center are stacked and the shaft is inserted into the opening portions, the mediums are fixed to the shaft while the mediums into which the shaft is inserted are guided with a fluid.

Abstract: In a medium fixing method of fixing one or a plurality of mediums on a shaft while the one or plurality of mediums each having a circular opening portion in a substantially center are stacked and the shaft is inserted into the opening portions, the mediums are fixed to the shaft while the mediums into which the shaft is inserted are guided with a fluid.

Abstract: In a medium fixing method of fixing one or a plurality of mediums on a shaft while the one or plurality of mediums each having a circular opening portion in a substantially center are stacked and the shaft is inserted into the opening portions, the mediums are fixed to the shaft while the mediums into which the shaft is inserted are guided with a fluid.

Abstract: The present invention relates to the stabilization of enzyme-labeled anti-human interferon-.beta. antibody for use in an enzyme immunoassay of human interferon-.beta. and provides a freeze-dried composition containing an anti-human interferon-.beta. antibody which has been freeze-dried in the presence of trehalose as a nonreducing disaccharide. The freeze-dried composition according to the present invention whose reduction in enzymatic activity remains minimized even when stored for a long period of time is conveniently incorporated into an EIA kit. No conventional non-volatile buffer solution such as a phosphate buffer solution is added to the original freeze-dried liquid of the present invention.

Abstract: A valve drive mechanism for driving intake and exhaust valves of a vehicle engine comprises a cam shaft offset toward the intake valve, a first rocker arm driven by the cam shaft for opening and closing the intake valve and a second rocker arm driven by the cam shaft via an intermediate rocker arm for opening and closing the exhaust valve. A spark plug can be disposed in an upright posture in a cylinder head since the cam shaft is offset and does not interfere with the location of the spark plug. It is possible to design a large-valve-face valve due to the upright posture of the spark plug. Also, each rocker arm is made to be lightweight, so that desired valve movement can be expected even when the engine revolution speed is high.