摘要:
In a legged mobile robot (1), each leg (2) has at least a first joint (16) and a second joint (18, 20) located below the first joint in the gravitational direction, and the actuator that drives the second joint (54, 56) is located at least one of a position same as that of the first joint and a position (28) above the first joint in the gravitational direction. With this, it becomes possible to lighten the weight of the ground-contacting ends of the legs and thereby provide a legged mobile robot enabling reduction of the inertial forces occurring in the legs during moving, particularly during high-speed moving.
摘要:
In a legged mobile robot (1), each leg (2) has at least a first joint (16) and a second joint (18, 20) located below the first joint in the gravitational direction, and the actuator that drives the second joint (54, 56) is located at least one of a position same as that of the first joint and a position (28) above the first joint in the gravitational direction. With this, it becomes possible to lighten the weight of the ground-contacting ends of the legs and thereby provide a legged mobile robot enabling reduction of the inertial forces occurring in the legs during moving, particularly during high-speed moving.
摘要:
Novel tumor cell growth inhibitor is a protein which can be obtained from the culture supernatant of 3T3 cell-derived cell line and which has the following properties:(a) molecular weight 3,700.+-.370 daltons when measured by SDS polyacrylamide gel electrophoresis under reducing and non-reducing conditions;(b) column propertythe inhibitor is not substantially adsorbed onto an anionic exchange resin column at pH of about 7.4 but is substantially adsorbed onto a cationic exchange resin column at pH of about 5.0The inhibitor has an inhibitory activity on human promyelogenic leukemia cells and human uterocervical tumor-derived cells and is useful for the treatment of leaukemia or uterus tumor.
摘要:
A DNA fragment encoding a novel human-derived tumor cell growth inhibitor can be obtained from a cDNA library originating from human colon tumor cell, using as a DNA probe a DNA fragment encoding mouse human-derived tumor cell growth inhibitor. An expression plasmid bearing a promoter originating from Bacillus brevis, a signal peptide originating from Bacillus brevis and a DNA fragment encoding human-derived tumor cell growth inhibitor downstream of the signal peptide is constructed and Bacillus brevis is transformed by the expression plasmid. The resulting transformant is incubated to secret the novel inhibitor out of the cell so that the novel inhibitor can be produced efficiently.
摘要:
A sintered composite body of silicon nitride and silicon carbide is manufactured by mixing a silicon powder with a carbonaceous powder and a sintering additive, producing a mixture, molding the mixture into a molded body, heat-treating the molded body in an atmosphere containing a nitrogen gas for thereby simultaneously nitriding and carbonizing silicon contained in the molded body, and subsequently firing the molded body in a nitrogen gas atmosphere. A composite powder of silicon nitride and silicon carbide which is produced by simultaneously nitriding and carbonizing silicon contained in the molded body has a content of .alpha.-type silicon nitride which is at least 30% of all silicon nitride in the composite powder. To produce such a composite powder, a silicon powder is mixed with a carbonaceous powder and a sintering additive, producing a mixture, and the mixture is heat-treated in an atmosphere containing a nitrogen gas at a temperature of at most 1450.degree. C. for thereby simultaneously nitriding and carbonizing silicon contained in the mixture, the arrangement being such that the temperature of the mixture is increased at a rate lower than 2.degree. C./minute from a temperature before the silicon starts being nitrided and carbonized up to the temperature of at most 1450.degree. C.
摘要:
DNA fragments encoding a tumor cell growth inhibitors and having a nucleotide sequence shown by formula (1) below, which are produced by preparing cDNA library from mRNA of the established 3T3 cell-derived cell line, amplifying various DNA fragments considered to encode the tumor cell growth inhibitors by the PCR method, analyzing the nucleotide sequences of these DNA fragments and determining the nucleotide sequences of the DNA fragments encoding the inhibitors: ##STR1## wherein X represents TTC TTT CTA or TTC (SEQ ID NO:1 or SEQ ID NO:2).
摘要:
A silicon nitride reaction-sintered body having a high mechanical strength without surface working can be produced by (1) forming a silicon powder mixture of at least two types of silicon powders having substantially independent particle size distribution ranges into a green body, the silicon powder mixture having an average particle size ranging from 5 .mu.m to 300 .mu.m; (2) heating the green body in a nitrogen-containing atmosphere for nitrogenation; and (3) sintering the nitrogenated green body at a temperature of 1900.degree. C. or higher.
摘要:
An electromagnetic reflection body is disclosed, which comprises a woven fabric made from a blended yarn of metallic filament and organic or inorganic fiber, and a fiber reinforced synthetic resin united therewith in one piece. This reflection body is used for an electromagnetic wave reflector, an electromagnetic interference shielding plate and the like.
摘要:
A silicon nitride reaction-sintered body having a high mechanical strength without surface working can be produced by (1) forming a silicon powder mixture of at least two types of silicon powders having substantially independent particle size distribution ranges into a green body, the silicon powder mixture having an average particle size ranging from 5 .mu.m to 300 .mu.m; (2) heating the green body in a nitrogen-containing atmosphere for nitrogenation; and (3) sintering the nitrogenated green body at a temperature of 1900.degree. C. or higher.