Abstract: A closed-type electrically-driven compressor comprising a compressing mechanism portion and an electric motor portion driving the compressing mechanism portion within a closed container, which is formed to be substantially cylindrical, and a terminal fitted into a hole formed in a cover body of the closed container and welded to the cover body, and wherein a mount portion and vicinities of the terminal on the cover body of the closed container are formed into a convex-shaped portion which is protuberant from a peripheral flat portion of the cover body.

Abstract: An isolated SDS-resistant hyperthermostable .beta.-galactosidase gene derived from Pyrococcus furiosus. Examples thereof include genes respectively shown in SEQ ID NO: 1 and SEQ ID NO: 2 and genes each hybridizable with the above gene shown in SEQ ID NO: 1. A method of cloning the hyperthermostable .beta.-galactosidase gene in which each of the above genes or pacts thereof is used as a probe or primer. A process for producing a hyperthermostable .beta.-galactosidase by culturing a transformant into which a plasmid containing each of the above gene has been introduced.

Abstract: An isolated hyperthermostable .beta.-galactosidase gene derived from Pyrococcus furiosus is described. Examples include DNA sequences shown in SEQ ID NO. 2 and SEQ ID NO. 4 and DNAs hybridizable with these DNAs. A method of cloning the hyperthermostable .beta.-galactosidase gene in which each of the above sequences or portions thereof is used as a probe or primer is described. A process for producing a hyperthermostable .beta.-galactosidase by culturing a transformant into which a plasmid containing each of the above genes has been introduced is described. A particularly preferred gene encodes an SDS-resistant hyperthermostable .beta.-galactosidase.

Abstract: A synthetic quartz glass optical member for an ultraviolet laser, where the quartz glass has a hydroxyl content of 10-100 ppm, a chlorine content of 200 ppm or less, a hydrogen content of 1.times.10.sup.16 molecules/cm.sup.3 or less, a homogeneity of refractive index of 5.times.10.sup.-6 or less in terms of .DELTA.n, and a birefringence of 5 nm/cm or less.

Abstract: A synthetic quartz glass optical member for an ultraviolet laser, suitably applicable as a stepper lens of a lithographer using an excimer laser beam and other optical members, wherein the quartz glass has a hydroxyl content of 10 to 100 ppm, a chlorine content of 200 ppm or less, a hydrogen content of 1.times.10.sup.16 molecules/cm.sup.3 or less, a homogeneity of refractive index of 5.times.10.sup.-6 or less in terms of .DELTA.n, and a birefringence of 5 nm/cm or less. The optical member can be produced by subjecting a volatile silicon compound to flame hydrolysis with oxyhydrogen flame, depositing the formed particulate silica on a heat-resistant support to prepare a porous silica matrix, heating the matrix in a vacuum as high as 1.times.10.sup.-2 Torr or above to a temperature of 1,400 .degree. C.