Abstract: A cylinder head structure for an engine, including grooves (18; 12a) in a top surface (2; 2a) of a cylinder head body (1; 1a) such that they surround an associated a fuel injection nozzle hole (11; 8a). Valve tappet guide holes (6; 3a) are also formed in the top surface (2; 2a) of the cylinder head body (1; 1a) around each of the fuel injection nozzle holes (11; 8a). The grooves (18; 12a) connect the adjacent tappet guide holes (6; 3a) and surround the associated nozzle or spark plug hole. Cylinder head bolt holes (15; 9a) are also formed around the tappet guide holes (6; 3a). When cylinder head bolts are tightened to join the cylinder head with a cylinder block, a radiant tension (F) is generated from the cylinder head bolt heads which are in contact with the cylinder head top surface. This radiant tension would cause cracking around the injection nozzle hole (11; 8a).

Abstract: The safe fetus fixation enhancer to stabilize the intrauterine fixation of a fetus contains a bacterial strain of genus Bifidobacterium having an effect of augmenting IgA production as the effective ingredient. The effect of augmenting IgA production is called IgA induction potential, which potential activates and enhances the action of IgA production cells producing secretory-type IgA against antigen. When the fetus fixation enhancer is administered to a mother animal on pregnancy or on the schedule of pregnancy, the action of the secretory-type IgA augmented and produced in the mother body for preventing infection is exerted to prevent and avoid the adverse effects of infectious diseases possibly causing the deciduation of an embryo or a fetus from the uterine wall, whereby the intrauterine fixation of the fetus can be stabilized.

Abstract: The present invention provides a direct injection type multicylinder engine capable of reducing the dimensions and number of parts thereof by forming so as to be used in common the cam brackets for retaining cam shafts, clamp members for fixing adjacent injectors, and fixing stud bolts. The cam brackets comprise singly formed parts, and retain the cam shafts rotatably on a cylinder head. The clamp members are adapted to fix adjacent injectors to the cylinder head at once. The cam brackets and clamp members are fixed to the cylinder head by inserting first common stud bolts through the central portions of the cam brackets and those of the cam brackets. The engine can be miniaturized by reducing the distance between the cam shafts, and the number of the parts required to retain the injectors and cam shafts is reduced.

Abstract: An aluminum oxide based sintered body and a method for manufacturing the same are disclosed. The aluminum oxide based sintered body is composed of silicon compounds in particulate form of from about 5 to about 40 mole %, calculated as a carbide, which is present along grain boundaries as a silicon-containing glass, at least one metal or metal compound of from 0.5 to about 20 mole %, calculated as metals, selected from Ti, Nb, Ta, Cr and Mo, and the remainder of Al.sub.2 O.sub.3, and the molar ratio of the metals with respect to the silicon compounds, calculated as a carbide, is about 4 or less.

Abstract: An aluminum oxide based sintered body and a method for manufacturing the same are disclosed. The aluminum oxide based sintered body is composed of silicon compounds of from about 5 to about 40 mole %, calculated as a carbide, at least one metal or metal compound of from 0.5 to about 25 mole %, calculated as metals, selected from Ti, Nb, Ta, Cr and Mo, and the remainder of Al.sub.2 O.sub.3, and a molar ratio of the metals with respect to the silicon compounds, calculated as a carbide is about 4 or less.

Abstract: An aluminum oxide-based sintered object having excellent abrasion resistance includes .alpha.-aluminum oxide, a silicon compound and a tungsten compound, wherein the silicon compound and the tungsten compound are present in amounts based on starting amounts of SiC and W metal of from 5 to 40 mole % and from 0.5 to 25 mole %, respectively, based on the sintered object overall, with a W/SiC molar ratio of 4 or less, and in which particles of at least one of tungsten carbide and tungsten silicide having an average particle diameter of 0.5 .mu.m or less are dispersed as a crystalline phase.