Abstract: In an annular microstrip antenna element, an annular radiant conductor plate is mounted on a ground conductor plate via a dielectric layer. A coaxial transmission line is provided, whose external conductor is connected to the ground conductor plate, and whose central conductor is connected to the radiant conductor plate, via a feeding point, with a pair of microstrip lines. The pair of microstrip lines extend from the feeding point to two connecting points on the radiant conductor plate, forming an angle between them like a V shape. By varying the angle, it is possible to adjust the input impedance of the annular microstrip antenna element at the feeding point, so that impedance matching with the coaxial transmission line is achieved. In a radial line antenna system comprising a plurality of the antenna elements, the antenna elements are mounted on concentric circles with a constant space between the adjacent antenna elements, thereby reducing undesirable electromagnetic coupling.

Abstract: A semiconductor laser device includes a base, a semiconductor laser chip and a resin layer enclosing the laser chip. The base may have a monitor photodiode mounted thereon in the vicinity of the laser chip. The resin layer enclosing the laser chip or both of the laser chip and the monitor diode chip is made of a single synthetic resin having a thickness not greater than 500 .mu.m and also having a surface substantially parallel to an outwardly oriented beam emitting end face of the laser chip.

Abstract: The present invention relates to a preparation for the therapy of respiratory tract diseases which contains a basic fibroblast growth factor and/or a homologue thereof as an active ingredient, a preparation for the therapy of respiratory tract diseases which contains a human basic fibroblast growth factor and/or a homologue thereof, produced by microorganisms or cultured cells prepared by genetic recombination, as an active ingredient, and a method for the therapy of respiratory tract diseases by administering any one of these preparations.

Abstract: A piperidine derivative having the formula (I): ##STR1## wherein R.sup.1 and R.sup.2, which may be the same or different from each other, are (i) a not-substituted phenyl group or a phenyl group substituted by a halogen atom, trifluoromethyl group, a C.sub.1-5 alkyl group or a C.sub.1-5 alkoxyl group, (ii) a C.sub.3-7 cycloalkyl group, (iii) pyridyl group or (iv) thienyl group, R.sup.3 is (i) hydrogen atom, (ii) a halogen atom, (iii) a C.sub.1-4 alkyl group or (iv) a C.sub.1-4 alkoxyl group, R.sup.4 is (i) hydrogen atom or (ii) a C.sub.1-4 alkyl group. R.sup.5 is (i) a not-substituted C.sub.1-5 alkyl group or a C.sub.1-5 alkyl group substituted by a halogen atom, (ii) phenyl group or (iii) thienyl group and Z is (i) a C.sub.1-6 alkylene group, (ii) a C.sub.2-6 alkenylene group or (iii) a C.sub.3-6 alkynylene group or a pharmacologically acceptable salt thereof. According to the present invention, an anti-allergic agent and a therapeutic agent for ischemic heart disease without toxicity can be provided.

Abstract: A driving circuit of a semiconductor laser includes a photodiode receiving a light of the semiconductor laser, a first detecting circuit for calculating a mean value signal of outputs of the semiconductor laser in accordance with an output of the photodiode, a second detecting circuit for calculating a maximum value signal of the outputs of the semiconductor laser, a circuit receiving the mean value signal for supplying a bias current for driving the semiconductor laser, a high-frequency superimposing circuit for modulating the bias current by high-frequency waves, and a modulating degree control circuit comparing the mean value signal with the maximum value signal for making a period of time for which the minimum value of the optical output values of the semiconductor laser becomes zero, in accordance with the comparison results.

Abstract: Novel acyl-coenzyme A oxidase is produced by cultivating an acyl-coenzyme A oxidase-producing microorganism belonging to the genus Candida in a nutrient medium, thereby accumulating an amount of acyl-coenzyme A oxidase in yeast cells and recovering the acyl-coenzyme A oxidase from said cells.