Abstract: The purpose of the present invention is to provide a novel stereoselective method for preparing a cyclic dinucleotide derivative and a production intermediate therefor, which can be used for an antibody-immunostimulant conjugate. Also provided is a method for producing a cyclic dinucleotide-linker and an antibody-immunostimulant conjugate while using the above production method. Further provided is a method for preparing a cyclic dinucleotide derivative, the method including the step of subjecting a compound (I) and a compound (IV) to stereoselective condensation using an optically active phosphitylating agent (Rc-II) or (Sc-II).

Abstract: A paper container comprises: a container main body in the form of a rectangular parallelepiped that accommodates a number of papers or the like, such as tissue papers, that are placed one upon another, being folded; and an opening portion which is formed on a top of the container main body, wherein respective cuts 5 for a pair of up and down movable flaps 3a, 3b, and pairs of side flaps 4a, 4b, 4c, 4d are formed with a waved blade (corrugated) cutting tool whose blade portion has a pitch of 0.1 to 3.0 mm.

Abstract: A paper container 1 comprising a container main body 2 in the form of a rectangular parallelepiped that accommodates a number of papers or the like, such as tissue papers, that are placed one upon another, being folded; and an opening portion 10 which is formed on the top of the container main body 2, wherein respective cuts 5 for a pair of up and down movable flaps 3a, 3b, and pairs of side flaps 4a, 4b, 4c, 4d are formed with a waved blade cutting tool which blade portion has a pitch of 0.1 to 3.0 mm.

Abstract: An improved loading mechanism for a magnetic disk device comprises a rack provided on a movable plate, and a rotary oil damper provided on a fixed or stationary member and having a gear wheel provided thereon, whereby the rack is engaged with the gear wheel so as to control a speed of slipping movement of the movable plate causes by a force of a return spring. Accordingly, a force of a second magnetic head to collide with a first magnetic head is reduced, and hence damage to a flexible disk or break of a magnetic head can be minimized while the reliability of the system is improved.

Abstract: A fulcrum for the swing of an arm 5 holding a first magnetic head 2 is provided by a rotation fulcrum pin 21 which is supported on sloped sidewalls of V-shaped grooves 23. A leaf spring 24 pushes the rotation fulcrum pin 21 against the sloped sidewalls grooves 23 at all times. The opening stroke of the arm 5 is not limited by the fulcrum and the rigidity of the arm 5 at the fulcrum is increased.