Abstract: A method of measuring a quantity of a substrate contained in sample liquid is provided. This method can reduce measurement errors caused by a biosensor. The biosensor includes at least a pair of electrodes on an insulating board and is inserted into a measuring device which includes a supporting section for supporting detachably the biosensor, plural connecting terminals to be coupled to the respective electrodes, and a driving power supply which applies a voltage to the respective electrodes via the connecting terminals. One of the electrodes of the biosensor is connected to the first and second connecting terminals of the measuring device only when the biosensor is inserted into the measuring device in a given direction, and has a structure such that the electrode becomes conductive between the first and second connecting terminals due to a voltage application by the driving power supply.

Abstract: It is an object of the present invention to provide a polytetrafluoroethylene-based-resin tube high in longitudinal tensile strength and a method of producing the same.

Abstract: A process for preparing ground resin particles is provided by modifying a jet mill with opposed fluidized bed, wherein the grinding efficiency can be dramatically increased, the operating conditions can be relieved, and smaller device size and reduced running cost can be achieved. By using a jet mill having a plurality of jet nozzles disposed at predetermined positions in a barrel of a grinding chamber toward the injection point of the grinding chamber and a bottom wall having a flat surface in part or in whole, parallel to the jet nozzles, or a jet mill having a plurality of jet nozzles disposed at predetermined positions in a barrel of a grinding chamber toward the injection point of the grinding chamber and a bottom wall having a conical projection immediately below the injection point, resin particles to be ground are jetted with or without water, thereby being ground to obtain ground resin particles of an intended particle size.

Abstract: A biosensor, a measuring instrument for biosensor, and a method of quantifying a substrate contained in specimen liquid to reduce a measurement error by the biosensor; a biosensor, comprising at least a pair of electrodes formed on an insulation substrate; a measuring instrument, comprising a supporting part for detachably supporting the biosensor, a plurality of connection terminals electrically connected to the electrodes, and a drive power supply for applying a voltage to the electrodes through the connection terminals; wherein the biosensor is inserted into the measuring instrument, either one of the electrodes of the biosensor is connected to first and second connection terminals fined to the measuring instrument only when the biosensor is inserted into the support part of the measuring instrument in a specified direction and has an electrode structure to allow the first connection terminal to conduct with the second connection terminal when a voltage is applied by the drive power supply.

Abstract: This invention relates to organic electroluminescent elemental devices (organic EL devices) of excellent durability and to organic EL materials useful for such organic EL devices. The organic EL material of this invention comprises a tertiary aryl amine containing 2-4 nitrogen atoms forming triarylamines and, as impurity, compound (A) containing one less nitrogen atoms forming triarylamines than said tertiary aryl amine or compound (B) containing one more nitrogen atoms forming diarylamino groups than said tertiary aryl amine with the content of compound (A) controlled at 1 wt % or less and that of compound (B) at 2 wt % or less.