摘要:
There is provided a novel xanthine Compound(I) ##STR1## wherein R.sup.1 and R.sup.2 are the same or different and each represent hydroxy-substituted, oxo-substituted or unsubstituted lower alkyl, Y is a single bond or alkylene, and Q is ##STR2## wherein R.sup.3 and R.sup.4 are the same or different and each represent hydrogen or hydroxy, n is 0 or 1; provided that when both of R.sup.3 and R.sup.4 are hydrogen, at least one of R.sup.1 and R.sup.2 is hydroxy-substituted or oxo-substituted lower alkyl; or a pharmaceutically acceptable salt thereof.The xanthine compound has adenosine A.sub.1 receptor antagonizing activity, and thus shows diuretic effect, renal-protecting effect, bronchodilatory effect, cerebral function improving effect and anti-dementia effect.
摘要:
Disclosed herein is a process for producing N-alkylpyrazoles represented by the formula (1), which comprises reacting an alkali metal or an alkali metal-containing base with N- unsubstituted pyrazoles represented by the formula (2), to form an alkali metal salt thereof and, subsequently, reacting the obtained alkali metal salt with an alkylating agent. ##STR1##
摘要:
Novel xanthine compounds represented by the following formula: ##STR1## wherein each of X.sup.1 and X.sup.2 independently represents oxygen or sulfur; and Q represents; ##STR2## where ----- represents a single bond or a double bond; Y represents a single bond or alkylene, n represents 0 or 1, each of W.sup.1 and W.sup.2 independently represents hydrogen, lower alkyl or amino, Z represents --CH.sub.2 -, --O--, --S-- or --NH--; represents ##STR3## each of R.sup.1 and R.sup.2 independently represents hydrogen, lower alkyl, allyl or propargyl; and R.sup.3 represents hydrogen or lower alkyl, and when Q represents the groups other than ##STR4## each of R.sup.1, R.sup.2 and R.sup.3 independently represents hydrogen or lower alkyl;provided that when Q is ##STR5## then R.sup.1 R.sup.2 and R.sup.3 are notsimultaneously methyl; and pharmaceutically acceptable salts thereof have a diuretic effect, a renal-protecting effect and a bronchodilatory effect.
摘要:
There is disclosed a heterocyclic compound represented by general formula: ##STR1## wherein R.sup.1 represents hydrogen, lower alkyl or aryl; R.sup.2 represents hydrogen, hydroxyl or lower alkyl; A represents CH or N; X represents --O-- or --NH--; R.sup.3 represents hydrogen, hydroxyl or lower alkyl; R.sup.4 represents lower alkyl; represents 0 or 1, or a pharmaceutically acceptable salt thereof.
摘要:
The optical fiber coupler of the present invention is characterized in that, for a defined section in which two or more component optical fibers are thermally fused and elongated thereby forming a fused-elongated region which constitutes the optical fiber coupler, that at least one of the component optical fibers is formed from a single mode optical fiber material employed within a parameter range in which the mode field diameter increases monotonically with decrease in the diameter of the optical fiber core. The optical fiber coupler is further characterized in that, when using optical fibers from which a portion of the coating material has been removed thereby exposing the cladding, and by aligning two or more of such component optical fibers side by side in a plane and mutually thermally fusing the exposed cladding of adjacent optical fibers, after which the fused region is drawn out, thereby forming a fused-elongated region which constitutes the optical fiber coupler, for such an optical fiber coupler, optical fiber material is used in which the softening temperature of the core is higher than that of the cladding, and further, for the drawing out of the mutually fused sections, the tension employed is such that by virtue of remaining stress, the refractive index of the core is reduced.
摘要:
The invention discloses a process for the production of a particulate polymer which contains few fine particles and has a narrow particle size distribution and a controlled bulk specific gravity. Characteristic features of the process of this invention reside in that a polymer latex obtained by emulsion polymerization is successively processed through the following steps (I) and (II):Step (I) The polymer latex is coagulated into a slurry in which particles thus coagulated are dispersed in water.Step (II) The slurry obtained in Step (I), an organic liquid almost insoluble in water and incapable of dissolving the polymer and water are mixed for granulation under the conditions that(a) The proportion of water in the whole mixture is 50-85 wt. %,(b) The amount of the organic liquid is 15-150 parts by weight per 100 parts by weight of the polymer in the polymer latex, and(c) The temperature T (.degree.C.) of the whole mixture is maintained for 0.5 minute to 1 hour on average within the range of the following equation:A-40.ltoreq.T.ltoreq.A wherein A means the azeotropic temperature (.degree.C.) of the mixture.In the above process, control of the interfacial tension between the organic liquid and the dispersion medium of the slurry within a specific range has made it possible to control the particle size of the resulting particulate polymer to a desired level.
摘要:
An optical fiber coupler is disclosed, which comprises two polished substrates each of which comprises a grooved substrate having a polished surface on the open side end thereof and adapted to hold therein an optical fiber and an optical fiber comprising a core, a cladding and two stress-applying parts arranged in the cladding so as to sandwich the core, a part of the optical fiber being polished off such that the polished surface of the fiber is close to the core so as to allow leakage of light power propagating in the core to the outside, the polished optical fiber being embedded in the grooved substrate and fixed thereto in such a manner that the polished surface of the grooved substrate is in flush with the polished surface of the polished optical fiber, with the two polished substrates being in close contact with each other at the polished surfaces thereof to allow coupling of light power, wherein said polished optical fiber is of a construction such that the polished surface thereof is perpendicular to the polarization principal axis X defined as the direction connecting the centers of said stress-applying parts. Also, a process for manufacturing the optical fiber coupler is disclosed.
摘要:
Disclosed herein is a particulate polymer prepared by the agglomeration of polymer particles contained in a polymer latex. The particulate polymer is composed of primary particles having particle sizes of at least 20 .mu.m and/or secondary particles formed by the agglomeration of at least some of the primary particles and is in the form of a compact mass substantially free of voids. The particulate polymer is prepared by coagulating the polymer latex in the presence of a coagulant and an organic liquid having low solubility in water. The particulate polymer has a high bulk specific gravity and contains few fine particles. It is thus easy to handle and allows the consumption of energy to be reduced in the drying step.
摘要:
In a radio communication network system for use in carrying out communication with a plurality of radio telephone sets in a service zone by the use of a control channel and a plurality of speech channels, a connecting equipment unit (CE) is selectively operable in cooperation with a radio control unit (RCU) in a speech mode of forming a speech path through a selected one of the speech channels and an additional mode of selectively monitoring the control and the speech channels. The additional mode may be divided into first and second control modes for allowing and rejecting reception of a call with the control channel monitored, respectively. Alternatively, either a rest mode or a combination of rest and initial program loading modes may be added to the additional mode. A plurality of the connecting equipment units may be located in a single service zone and selectively put into the speech and the additional modes with only one of the connecting equipment units kept in the first control mode.
摘要:
Disclosed herein is a particulate polymer prepared by the agglomeration of polymer particles contained in a polymer latex. The particulate polymer is composed of primary particles having particle sizes of at least 20 .mu.m and/or secondary particles formed by the agglomeration of at least some of the primary particles and is in the form of a compact mass substantially free of voids. The particulate polymer is prepared by coagulating the polymer latex in the presence of a coagulant and an organic liquid having low solubility in water. The particulate polymer has a high bulk specific gravity and contains few fine particles. It is thus easy to handle and allows the consumption of energy to be reduced in the drying step.