Abstract: A method of producing useful substances which comprising propagating in cultured cells or in a host a recombinant Bombyx mori nuclear polydegrosis virus (BmNPV) DNA is disclosed. The BmNPV DNA is produced by recombination with a double-stranded DNA containing (i) a 5'-upstream BmNPV DNA fragment orginally occurring upstream from the structural gene coding for the production of polyhedral protein and also including the promoter region for the structural gene, (ii) a translational start codon and (iii) a gene coding for the production of a useful substance exogenous to the virus, with or without (iv) a 3'-downstream BmNPV DNA fragment originally occurring downstream from the structural gene coding for the production of polyhedral protein.

Abstract: Recombinant Bombyx mori nuclear polyhedrosis viruses having, in the polyhedral protein-encoding structural gene portion of the Bombyx mori nuclear polyhedrosis virus DNA (BmNPV DNA), a structural gene for a desired protein as joined to the whole of or a part of the polyhedral protein-encoding structural gene with or without interposition of a linker base sequence are provided.By propagating the above viruses in silkworm-derived cells or silkworms, fused proteins of a desired protein and the whole of or a part of the polyhedral protein as joined together with or without interposition of a linking amino acid or peptide are produced. The desired proteins can be obtained from the fused proteins by cleavage or decomposition at the linking site.

Abstract: A rotor for a superconducting electric rotary machine comprises a coil supporting tube, a superconducting wire constituting a superconducting field coil, in-line insulators disposed between the laterally adjacent lines of the wound wire and layer insulators between the vertically adjacent layers of the wound wire of the coil, wherein at least one of the line insulators and the layer insulators is formed by a grooved insulating material or a perforated insulating material.

Abstract: An automatic tracking welding machine includes a pair of rotatably mounted sensors 6a, 6b disposed in advance of a welding torch 3 and coaxial therewith for detecting magnetic leakage flux across a weld line gap 10. The sensors are driven to equalize their outputs by a reversible stepping motor 15 supplied with drive pulses whose frequency is proportional to the sensor output difference up to a fixed limit, thereby implementing slowdown as the center or zero differential point is approached. Alternatively, a greater number of fixed sensors may be peripherally spaced around the torch housing and their outputs sequentially scanned and peak detected to track the weld line gap. In another embodiment a spaced pair of sensors 116a, 116b is laterally and bidirectionally driven by a reversible d.c. motor 123 supplied with a voltage proportional to the off-center distance detected by the sensors, thus also implementing slowdown as the zero point approaches.

Abstract: A microwave heating oven comprises an inner casing or particles as an inner casing which is made of a material being heated by microwave in which a material being heated is placed; an intermediate casing made of a refractory insulator which causes less microwave loss and which covers said inner casing or particles; and means for applying the microwave from outside of the intermediate casing into the inner casing or particles.The microwave heating furnace can be used for uniformly heating the material at high temperature with small electric power. A ceramic and a porcelain can be prepared by a household microwave oven as one of the microwave heating furnaces.