摘要:
In a process for producing a pin layer sequence on a perovskite of the type ABO.sub.3 which has AO layers, AO layers are converted such that a p-conductive B-oxide rich layer and, disposed therebetween an ABO.sub.3 layer with intrinsic conductivity are formed. Also, a perovskite of the type ABO.sub.3 with a layer sequence on the surface which includes an AO-enriched (ABO.sub.3)-layer, a B-oxide rich layer and disposed therebetween an ABO.sub.3 layer and an electronic building element comprising such a perovskite.
摘要:
In an analytic process using porous silicon, a substance is detected or its concentration in a fluid is determined based on the change in the optical property of porous silicon as a function of the refractive index of the substance present in the pores of the porous silicon, or of the fluid containing the substance. An analytic device for detecting a substance or for determining the concentration of a substance in a fluid with the use of porous silicon comprises a component at least partly consisting of porous silicon, the optical property of which is dependent upon the refractive index of the substance or of the fluid containing the substance, whereby a change in the optical property of the porous silicon is measurable to indicate detection of the substance or to determine the concentration of such substance in the pores of the porous silicon.
摘要:
A reaction apparatus has a plurality of reaction flasks whose bottoms can communicate with a sterile gas source and are provided with porous filter plates which permit the gas to flow into the vessel but prevent the liquid from passing out through the plates. The culture flasks are received in pockets on an upper plate of a double-bottom structure which can communicate through the upper plate between a space within the double bottom and the bottom of the culture flasks. The spiral gas feed is connected to the double-bottom space.
摘要:
Stable microbial enzyme with alcohol dehydrogenase activity having an activity maximum at ca. 50.degree. C., process for its isolation and its use for the enantioselective reduction/oxidation of organic keto compounds/hydroxy compounds wherein, depending on the type of the starting compounds R- or S-hydroxy compounds are obtained. In particular an alcohol dehydrogenase obtainable from Lactobacillus brevis has proven to be suitable.
摘要:
In a fuel cell arrangement with at least one fuel cell operated by a fuel and an oxidizing agent, means are provided for effecting gravity driven circulation of the fuel and the oxidizing agent through the fuel cell so that no pumping means, which consume power and need servicing, are required.
摘要:
The invention concerns a DNA fragment located in front of the malate synthase gene of a coryne-form bacterium and isolated from the latter. Any structural gene which codes for a protein can be inserted after this DNA fragment. After transformation of such a construct into a coryne-form bacterium, expression of the structural gene inserted after the DNA fragment is regulated. The invention also concerns a process for synthesizing any protein by culturing a transformed coryne-form bacterium. A bacterium of this type contains in replicable form a DNA fragment isolated from the malate synthase gene of a coryne-form bacterium, and after which the structural gene which codes for the protein to be synthesized is inserted. Since expression of the structural gene which codes for the protein to be synthesized is regulated by the DNA located in front of it, the structural gene is expressed and the desired protein synthesized as soon as a suitable inducing agent is added to the medium.
摘要:
A process for producing a layered structure in which a silicide layer on a silicon substrate is subjected to local oxidation to cause the boundary layer side of the silicide layer to grow into the silicon substrate.
摘要:
A process and measuring device for determining the tissue-equivalent dose in radiotherapy. First, the radiation dose is measured according to the process at a site by at least two sensors i and j. The sensors are designed such that the associated measuring signals S.sub.i and S.sub.j display different energy dependency of the detection sensitivity to ionizing radiation, a dose-independent quotient Q.sub.ij =S.sub.i /S.sub.j being formed from this difference. The tissue-equivalent dose D is then calculated from this dose-independent value. The advantages of this process are that the sensor material does not have to be adapted to the tissue and can therefore be freely selected, and the tissue-equivalent dose is determined highly accurately. The measuring device comprises three parallel fiber-optic sensors disposed equidistant in a plane, the outer sensors being identical and differing from the central sensor by differing energy dependency of the detection sensitivity to ionizing radiation.
摘要:
A gradiometer for measuring magnetic field gradients has two SQUID loops lying in a SQUID loop plane with a flux concentrator lying in a flux concentrator plane parallel to the SQUID loop plane. The flux concentrator body is mirror symmetrical with respect to a plane of symmetry perpendicular to the SQUID plane and the flux concentrator plane along a basis line connecting the centers of the SQUID loops.
摘要:
A thin-film solar cell in which between a TCO layer and a p-doped layer an n-doped intermediate layer is provided and at least the intermediate layer or the neighboring p-doped layer is composed of a microcrystalline material, especially microcrystalline SiC or SiO.