Abstract: A printing apparatus has a plurality of image forming sections that are removably attached to a body of the printing apparatus and form images of different colors. The apparatus includes a specifying unit such as an operation panel and a control unit. The specifying unit specifies an image forming section that performs printing. The control unit controls the image forming section specified by the specifying unit to form an image of a corresponding color. The apparatus further includes a plurality of detectors that detect the presence and absence of corresponding image forming sections in the body. When the detector detects that a specified image forming section is present, the control unit controls the specified image forming section to operate. When the detector detects that the specified image forming section specified is absent, the control unit does not control the specified image forming section to operate.

Abstract: A color image printing apparatus has a plurality of positioning mechanisms each of which selectively positions a corresponding photoconductive drum at an operative position and a non-operative position. A controlling section selectively controls the positioning mechanisms in a first operation mode or in a second operation mode according to the color detected in the color plane by the color detecting section. The first operation mode is a mode where the controlling section causes a positioning mechanism corresponding to the color detected by the color detecting section to the operative position, and the positioning mechanism remains at the operative position throughout the job once it is brought to the operative position.

Abstract: By applying radiation beam energy to a contact portion between an end portion 7 of a glass tube 1 and a zinc-mercury alloy drop 6 and the vicinity thereof by means of an optical fiber 5, the alloy drop 6 is directly heated so as to be caused to partly melt at a bottom portion thereof and fixed firmly to an inner wall surface of the end portion 7 of the glass tube without causing variations.

Abstract: A module substrate consists of a substrate mounting electronic parts on one surface thereof, a conductor for electrically conducting the electronic parts mounted on the substrate to the other surface of the substrate, a conductive solder for attaching the conductor to a base substrate movably contacting the other surface of the substrate to electrically connect the electronic parts with the base substrate, and a deformable bushing for holding the conductor to maintain the attachment of the conductor to the base substrate regardless of whether the base substrate is moved.

Abstract: A plant growth regulator containing as an active ingredient one or more compounds represented by the formula ##STR1## wherein R, X, Y and Z are defined in the specification is disclosed. The plant growth regulator is effective for a wide variety of plants, particularly for grassy plants. In addition to such activity, the regulator of this invention acts on plants to thicken the foliage and to aid health growth without causing substantial phytotoxicity.

Abstract: Isonicotinanilide derivatives of the formula ##STR1## (wherein R.sub.1 is a hydrogen atom or a lower alkyl group; X is a halogen atom or methyl; n is an integer of from 0 to 2; R.sub.2 is phenyl, halo-substituted phenyl or a lower alkyl group; and Q is ##STR2## provided that Q is ##STR3## or --CH.sub.2 --when R.sub.2 is phenyl or halo-substituted phenyl, and Q is ##STR4## when R.sub.2 is a lower alkyl group) a process for preparing the same and a plant growth regulator containing the same are disclosed. The derivatives of the formula above have good activity for regulating the growth of various plants, especially of grassy plants.