摘要:
A 22-oxacholecalciferol derivative represented by formula (I): ##STR1## wherein R.sub.1 represents a hydrogen atom or a hydroxyl group; and R.sub.2 and R.sub.3, which may be the same or different, each represent a lower alkyl group having from 1 to 5 carbon atoms,and a process for preparing the same are disclosed. The compound of the present invention has potent differentiation inducing activity and cell proliferation inhibitory activity and is expected to be useful as an anti-tumor agent, an antirheumatic, a treating agent for psoriasis, and a treating agent for hyperparathyreosis. The process of the present invention makes it possible to efficiently produce a desired 22-oxacholecalciferol derivative while reducing by-production.
摘要:
An ultrasonic treatment apparatus includes a sheath having an opening at a distal end thereof; an ultrasonic transducer provided at a distal portion of the sheath and generating ultrasonic vibration; an ultrasonic transmission member connected to the ultrasonic transducer at a proximal end thereof, transmitting the ultrasonic vibration, and provided with a treatment part at a distal end thereof; a gripper moving to the treatment part and grasping the part to be treated between the gripper and the treatment part; a link member connected to the gripper and provided on a side of the ultrasonic transmission member; a manipulator part connected to a proximal end part of the link member to open and close the gripper; and a rigid member which the ultrasonic transducer is inserted into and secured to.
摘要:
The present invention provides an industrially advantageous method for producing an unsaturated carboxylic acid-modified vinyl alcohol polymer, and a gas barrier film obtained by using the same. In summary of the present invention, the present invention is a method for producing a solution containing at least an unsaturated carboxylic acid-modified vinyl alcohol polymer characterized by reacting a vinyl alcohol polymer and an unsaturated carboxylic acid compound in the presence of an acid catalyst soluble in the reaction system or a solid acid catalyst, and a gas barrier film obtained by using the same, and an example of a representative constitution thereof is a method for producing a solution (A) containing an unsaturated carboxylic acid-modified vinyl alcohol polymer (b), the method comprising following two steps of: (1) a reaction step in which the unsaturated carboxylic acid-modified vinyl alcohol polymer (b) is formed by reacting a vinyl alcohol polymer and an unsaturated carboxylic acid compound (a) in the presence of an acid catalyst soluble in the reaction system; and (2) an ion exchange step in which at least the acid catalyst of acidic compounds is removed by an anion exchange resin.
摘要:
An ultrasonic treatment apparatus comprises an endoscope having an insertion portion to be inserted in a body cavity, and a treatment unit having an ultrasonic vibrator which generates ultrasonic vibrations, and a treatment portion which performs treatment by utilizing the ultrasonic vibrations generated by the ultrasonic vibrator. The ultrasonic treatment apparatus further comprises a treatment unit holding portion, which is provided in a distal end portion of the insertion portion and to which the treatment unit is attached, a cable which transmits an electric signal to the ultrasonic vibrator, and at least one bundle member which bundles the insertion portion and the cable.
摘要:
A camera having a lens shutter mechanism in accordance with the present invention comprises sectors lying in a lens frame and forming a predetermined exposure aperture, a drive ring for opening and closing the sectors, a high-speed sector opening lever and a low-speed sector opening lever which drive the drive ring through an interlock lever, a plurality of springs having different strengths and constraining the high-speed sector opening lever and low-speed sector opening lever, a sector closing lever for driving the high-speed sector opening lever and low-speed sector opening lever in a direction causing the sectors to close, a mode changing member for changing shutter speeds by selecting whether both or either of the high-speed sector opening lever and low-speed sector opening lever should be driven, a charge cam gear for resetting the shutter mechanism to an initial position after exposure is completed, and a groove bored along the optical axis in a camera body and designed to guide the drive ring along the optical axis when the lens frame collapses and to restrain the drive ring from rotating about the optical axis after the lens frame completes collapsing. Only a minimum number of required members are disposed in a lens frame and the remaining members are arranged in a camera body. This results in a compact camera.
摘要:
An ultrasonic treatment apparatus comprises an endoscope having an insertion portion to be inserted in a body cavity, and a treatment unit having an ultrasonic vibrator which generates ultrasonic vibrations, and a treatment portion which performs treatment by utilizing the ultrasonic vibrations generated by the ultrasonic vibrator. The ultrasonic treatment apparatus further comprises a treatment unit holding portion, which is provided in a distal end portion of the insertion portion and to which the treatment unit is attached, a cable which transmits an electric signal to the ultrasonic vibrator, and at least one bundle member which bundles the insertion portion and the cable.
摘要:
This endoscopic treatment system is provided with an insertion-retraction and rotating device for a treatment tool, which performs an insertion-retraction operation along a direction of an axis of a treatment tool and a rotating operation around the axis, of the treatment tool inserted in a channel of an endoscope.
摘要:
A hemostatic forceps for an endoscope has a support section for supporting the pair of clamp pieces and so that they can rotate and change their distal parts direction. The pair of clamp pieces and are formed in tapered shape so that widths of the pair of clamp pieces gradually decrease in a direction from a side of the support section to a side of the distal parts. Length of the pair of clamp pieces at arbitrary location along the direction from a side of the support section to the distal sides, times the width of the pair of clamp pieces at the same location, is set to be substantially constant.
摘要:
There is provided a process for preparing a 1,3-dialkyl-2-imidazolidinone by using an alkylene oxide as a first component, using at least one of (A) carbon dioxide and a monoalkylamine; (B) a carbon dioxide compound of the monoalkylamine; and (C) an 1,3-dialkylurea, reacting the first and second components by heating at 50° C. or higher to give 1,3-dialkyl-2-imidazolidinone, characterized in that the total molar amount of a molar feed amount of the monoalkylamine included in the component (A), a molar feed amount of the monoalkylamine part of the carbon dioxide compound of monoalkylamine, component (B), and the double of a molar feed amount of the 1,3-dialkylurea, component (C), is at least three folds of a molar feed amount of the alkylene oxide.The preparation process of this invention uses an industrially readily available alkylene oxide as a starting material and can be suitably conducted with a higher yield in an industrial scale.
摘要:
A Patrone and a camera using the Patrone. The Patrone comprises a film wind spool arranged in a cylindrical body, of which upper and lower ends are light-tightly sealed. The body stores film so that the film can move freely in or out of the body in such a manner that the film can rotate freely, and is wound about said spool in roll form. Locking members are arranged in the cylindrical body and can be displaced freely relative to the spool. Ends of the locking members normally project outwardly from the cylindrical body. Locked members are arranged opposed to said locking members and are formed substantially as parts of one of the cylindrical body or spool. An elastic member normally urges each of the locked members toward engagement with an associated locking member. A camera includes an unlocking member which presses the locking members of the Patrone to displace them against the force of the elastic member when the Patrone is mounted in a camera thereby disengaging the locking members from the locked members and enabling the spool to rotate freely.