摘要:
The invention relates to a process for achieving high, thermally-induced expression rates, which last for a relatively long period of time, of proteins in recombinant cells, preferably in E. coli cells, by optimizing cell density, induction temperature and supplemented amino-acid-containing substrates.
摘要:
Glucose is rapidly ad quantitatively determined with an analytical agent containing glucose dehydrogenase having an activity of at least 2 .mu./mg and NADH.sub.2 oxidase activity less than 0.1%, a pyridine coenzyme, a buffer and mutarotase to increase spontaneous mutarotation of alpha-glucose to beta-glucose. There may be optionally present inhibitors for reduced pyridine coenzyme oxidases and a thermal stabilizing amount of alkali metal chloride.
摘要:
The invention relates to a process for the microbiological preparation of aldose-1-epimerase by cultivating microorganisms in a nutrient medium and release of the enzyme from the cells, which process is characterized in that microorganisms of the genus Acinetobacter are used.
摘要:
A drilling machine for drilling large drill holes in rock, especially underground, comprises a support, a rotary drilling drive longitudinally displaceable on the support in a drilling direction and provided with a reducing transmission and drive motors. The reducing transmission including a planetary transmission which is transmissively and selectively connectable with two of the drive motors as a superposed transmission.
摘要:
A process for the preparation of glucose dehydrogenase from Bacillus megaterium. This invention relates to the preparation of a genetically engineered polypeptide with the biological activity of the enzyme glucose dehydrogenase, and a new DNA sequence, recombinant DNA vector, and transformed microorganism therefor.
摘要:
A drilling machine for drilling descending large boreholes in earth or rocktructures, comprises an elongated drill pipe driven by a drive machine positioned outside a borehole being drilled, a drill head connected to said pipe and a support device for a drill head. A fluid-supplying device having a descending conduit, supplying fluid from the fluid supplying device to the drill head, is further provided in the drilling machine. A sluice charged with the mixture of the material drilled and the fluid is arranged in the drill head and driven by the drillpipe. The support device is secured in the machine against rotation.
摘要:
A process for the preparation of glucose dehydrogenase from Bacillus megaterium. This invention relates to the preparation of a genetically engineered polypeptide with the biological activity of the enzyme glucose dehydrogenase and a new DNA sequence, recombinant DNA vector, and transformed microrganism therefor.
摘要:
A rotary rock drilling machine comprises a carriage having two ends, a rotary drilling drive arranged longitudinally displaceable on the carriage, a guiding head arranged on one end of the carriage, the guiding head and the rotary drilling drive defining a longitudinal axis of the machine, a drilling rod composed of a plurality of drilling rod parts which are releasably connected with one another, the drilling rod parts having a plurality of screw convolutions, the drilling rod parts having one end having a coupling pin with a snap pin and another end having a coupling bush with an engaging opening for the snap pin, a positioning device in the guiding head arranged to arrest a rotary position of the drilling rod, and an unlocking device for the snap pin, the positioning device including a locking bar which extends substantially parallel to the longitudinal axis and displaceable radially to the drilling rod, and which is insertable in at least one radial slot provided in the screw convolution of the drilling rod.
摘要:
A rock drilling machine, particularly for underground excavations comprises a drilling carriage, and a rotary drilling drive arranged in a longitudinally displaceable manner on the drilling carriage, the rotary drilling drive having a drive shaft, an adaptor connected with the drive shaft for joint rotation therewith and having a threaded end for form-locking receipt of drilling rods with a respective counter thread, and a clamping head co-rotating with the drive shaft for force-transmitting receipt of outwardly smooth drilling rods, the adaptor being arranged forwardly of the clamping head as considered in a drilling direction, the threaded end of the adaptor extending outwardly beyond the clamping head for free observation and being releasably mounted on a part of the drive shaft independently of the clamping head.
摘要:
A shaft drilling machine comprises a drill head carrying drill tools thereon, a device for guiding the drill head in a shaft, a device for advancing the drill head in the shaft, and drive aggregates which are lowered into the shaft together with the drill head and driving the latter. A sluice for providing a rinsing fluid is arranged in a pilot drill. A rinsing conduit and an ascending conduit for extracting from the shaft a drilled material-rinsing fluid mixture generated during the drilling operation are connected to the sluice which is formed as a bucket wheel.