Abstract:
A blue light emitting diode which has a multiple layer structure and is grown on a semiconductor crystalline substrate, wherein zinc of a group II element of the periodic table, lithium, sodium, or potassium of group VI elements are used. These elements and their compounds are used as impurities to be introduced into the construction when it is at the condition of vapor growing. A blue light emitting diode has a pair of Ohmic electrodes, an n-type semiconductor layer and a p-type semiconductor layer. These layers are grown from a vapor phase on the substrate and sandwiched between the electrodes.
Abstract:
An antibacterial composition for medical use comprising a cephalosporin or a pharmaceutically acceptable salt thereof and a .beta.-lactamase-inhibiting compound having a .beta.-lactam ring. The composition exhibits synergistic effect which is much greater than the sum of antibacterial effects of each component used alone.
Abstract:
A 7.alpha.-methoxycephalosporin represented by the general formula: ##STR1## wherein R.sup.1 represents a hydrogen atom or a carboxyl-protecting group; R.sup.2 represents an organic group linked to the carbon atom through an oxygen or sulfur atom; R.sup.3 represents a lower alkyl group; n is 0, 1 or 2; A represents a hydrogen atom or a substituted or unsubstituted alkyl group; and B represents a substituted or unsubstituted alkyl, cycloalkyl, cycloalkenyl, cycloalkadienyl or heterocyclic group, and a salt thereof. These compounds have a broad antibacterial spectrum, high resistance to .beta.-lactamase produced from bacteria, and an effective antibacterial activity against clinical isolates of bacteria.
Abstract:
A 7.alpha.-methoxycephalosporin represented by the general formula and a salt thereof: ##STR1## wherein R.sup.1 represents a hydrogen atom or a carboxyl-protecting group; R.sup.2 represents an organic group linked to the carbon atoms through an oxygen or sulfur atom; R.sup.3 represents a lower alkyl group; n is 0, 1 or 2; A represents a hydrogen atom or a substituted or unsubstituted alkyl group; and B represents a substituted or unsubstituted alkyl group. These compounds have a broad antibacterial spectrum and high resistance to .beta.-lactamase produced from bacteria, and are well absorbed in a living body.
Abstract:
Novel penicillins and cephalosporins and non-toxic salts thereof, which contain a mono- or di-oxo- or thioxo-piperazino(thio)carbonylamino group have been prepared. These compounds are valuable antibacterial compounds for use in mammals including man. A process for the preparation of the compounds has also been discovered.
Abstract:
Novel penicillins and cephalosporins and non-toxic salts thereof, which contain a mono- or di-oxo- or thioxo-piperazino(thio)carbonylamino group in molecule. These compounds are valuable antibacterial compounds for use in mammals including man. This disclosure relates to such compounds and a process for the preparation thereof.
Abstract:
In a terahertz-wave spectrometer, a spectroscopic prism is provided with a prism part slidable with respect to a main part thereof. Along the sliding direction, an arrangement surface in an upper face of the prism part is provided with a plurality of arrangement regions K to be arranged with objects to be measured. Therefore, after completing the measurement of optical constants for one object, the prism part is slid, so as to shift the next object onto an optical path of a terahertz wave T, whereby a plurality of objects can be measured smoothly without cleaning the arrangement surface.
Abstract:
Probe light pulses output from a light source are input to an optical effect unit after the beam diameter is changed by a beam diameter changing optical system, the pulse front is tilted by a pulse front tilting unit, and the beam diameter is adjusted by a beam diameter adjusting optical system. To the optical effect unit, probe light pulses output from the beam diameter adjusting optical system are input, and an electromagnetic wave being an object to be detected is also input. Optical characteristics of the optical effect unit change due to propagation of the electromagnetic wave, and probe light pulses affected by the change in optical characteristics are output from the optical effect unit. The probe light pulses output from the optical effect unit are detected by a photodetector.
Abstract:
An image forming apparatus includes: a first photosensitive drum for a monochrome printing mode; second and third photosensitive drums for a color printing mode; a moving unit moving a medium from the first photosensitive drum via the second photosensitive drum to the third photosensitive drum; charger devices for charging the photosensitive drums; transfer devices for transferring developer images on the photosensitive drums to the medium; and a control unit configured to control charging biases of the charger devices and transfer biases of the transfer devices. The control unit executes, in the monochrome printing mode, an energy saving control in which an absolute value of a charging bias applied to the charger device for the third photosensitive drum is smaller than an absolute value of a charging bias applied to the charger device corresponding to the second photosensitive drum.
Abstract:
By mating a main part with a first prism part or second prism part, a terahertz-wave spectrometer can easily switch between optical paths of a terahertz wave T propagating within a spectroscopic prism. When the main part mates with the first prism part, the terahertz wave T incident on an entrance surface passes through a depression, so as to be reflected by an arrangement part, whereby reflection spectrometry can be performed. When the main part mates with the second prism part, the terahertz wave T incident on the entrance surface is refracted by the depression, so as to pass through an object to be measured within a groove, whereby transmission spectrometry can be preformed.