Abstract: A chemical sensor having a field-effect transistor as an electronic transducer and used for the analysis of specific constituents in a liquid, the chemical sensor comprising means which permits an externally supplied sample solution to reach a chemical receptor of said chemical sensor but substantially prevents external light from reaching said field effect transistor.

Abstract: A photographic coupler capable of releasing a development inhibitor upon reaction with an oxidation product of a color developing agent and represented by the following general formula (I) or (II) ##STR1## wherein A represents a coupler residue; Z represents a sulfur atom, a selenium atom or an oxygen atom; R.sup.1 represents an aliphatic group; R.sup.2 and R.sup.3, which may be the same or different, each represents a hydrogen atom, an aliphatic group, an alkoxy group, a hydroxy group, or an aromatic group, and R.sup.2 and R.sup.3 can combine and represent the atoms necessary to form a benzene ring or a naphthalene ring, ##STR2## wherein A represents a coupler residue; R.sup.4 represents an aliphatic group or an aromatic group; and R.sup.5 and R.sup.6 which may be the same or different, each represents a hydrogen atom, an aliphatic group or an aromatic group; and silver halide photographic elements containing these photographic couplers.

Abstract: A silver halide photographic sensitive material containing a dye comprising at least one merocyanine dye having at least two acid groups in which the basic nucleus is an oxazole nucleus and at least one of the 4- and 5-positions of the oxazole nucleus is substituted with an aryl group or a substituted aryl group in at least one hydrophilic colloid layer of the silver halide photograhic sensitive material, and a basic polymer in at least one hydrophilic colloid layer of the silver halide photographic sensitive material.

Abstract: A silver halide photographic light-sensitive material having at least one hydrophilic layer to be dyed and containing, in a hydrophilic layer to be dyed, a dye represented by the following general formula (I): ##EQU1## wherein R represents an alkyl group or an alkenyl group; A represents an imino group (--NH--); Y represents an oxygen atom or a sulfur atom; Q represents an aryl group substituted with at least one of a sulfo group, a sulfoalkyl group and a carboxy group; L represents a methine group; n represents an integer of 0 to 1, and m and p each represents an integer of 0, 1 or 2; a silver halide photographic light-sensitive material containing at least one spectrally sensitized silver halide emulsion layer and in at least one hydrophilic layer to be dyed of the photographic light-sensitive material, at least one dye represented by general formula (I) as set forth above; and a silver halide photographic light-sensitive material containing at least three silver halide emulsion layers having different spec

Abstract: A photographic light-sensitive material comprising at least one hydrophilic colloid layer containing at least one dye represented by the following formula (I): ##SPC1##wherein R.sup.1 represents an alkyl group, a carboxy group, an alkoxycarbonyl group, a carbamoyl group, an alkylcarbamoyl group, a sulfamoyl group, an alkylsulfamoyl group, an acyl group, a hydroxy group, an alkoxy group, an alkylthio group, an amino group, a ureido group, an alkylureido group, a thioureido group or an alkylthioureido group; Q represents a sulfoalkyl group, a sulfoalkoxyalkyl group or a sulfoalkylthioalkyl group; L represents a methine group; n is 0 or 1; R.sup.2 represents --OR.sup.5 or ##EQU1## wherein R.sup.5, R.sup.6 and R.sup.7 each represents a hydrogen atom or an alkyl group; R.sup.3 represents a hydroxy group, an alkoxy group or an alkyl group; and R.sup.4 represents a hydrogen atom, an alkyl group, an alkoxy group, a sulfoalkoxy group, an alkylamino group or a dialkylamino group.

Abstract: Holographic silver halide elements are disclosed comprising fine silver halide particles spectrally sensitized with dyes sensitive in the 615-660 m.mu. region. The dyes are of the formula: ##EQU1## WHEREIN Z.sub.1 and Z.sub.2 are heterocyclic rings as defined in the specification and R, R.sub.1, R.sub.2, R.sub.3 and L are defined in the specification.

Abstract: A silver halide photographic material having increased sensitivity and gradient and being free from fog formation on storage, comprising a support and an emulsion layer containing very fine silver halide grains and containing a nitrogen-containing heterocyclic organic compound having a hydroxylamino group, such as 2-hydroxylamino-4,6-di(ethylamino)-1,3,5-triazine or 2,4-di(hydroxylamino)-6-diethylamino-1,3,5-triazine. The photographic material is useful for recording fine images with a superior sharpness, and the incorporation of the heterocyclic compound increases the sensitivity in spite of the fine grain size of the silver halide.

Abstract: A photographic emulsion containing a novel amphoteric copolymer which comprises:A. 0.5 to 30 mole % of cation-site containing repeating units of the formula (I) ##EQU1## wherein R.sub.1 represents a hydrogen atom or a methyl group and n is 1, 2, 3 or 4;B. 0.5 to 30 mole % of anion-site containing repeating units of the formula (II) ##EQU2## wherein R.sub.2 represents a hydrogen atom or a methyl group, and X represents ##SPC1##--COOM, --SO.sub.3 M or --COO(CH.sub.2).sub.m SO.sub.3 M, where M is a cation and m is 3 or 4; andC. the balance of repeating units of the formula (III) ##EQU3## wherein R.sub.3 represents a hydrogen atom or a methyl group, R.sub.4 and R.sub.5 each represents a hydrogen atom or a lower alkyl group or a substituted alkyl group thereof. The novel amphoteric copolymer can be substituted partly or entirely for the gelatin in a photographic emulsion, with excellent photographic effects.

Abstract: A silver halide photographic light-sensitive member comprising a support having on one side of the support at least one silver halide photographic emulsion layer and on the other side of the support at least one layer containing at least one dye represented by the general formula (I): ##SPC1##wherein Z is a group of atoms required for forming an indolenine nucleus or benzindolenine nucleus; R.sup.1 is a lower alkyl group or a lower alkenyl group; R.sup.2 is an --OXSO.sub.3 .sup.- group or an ##EQU1## group wherein X is an alkylene group or an alkenylene group, and Y is a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an acyl group, or an --OXSO.sub.3 .sup.- group; R.sup.3 is a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, a hydroxy group, an alkoxy group, an alkylthio group, a carboxy group, an alkoxycarbonyl group, an alkoxycarbonylamino group, or an acylamino group; and p is an integer of 1 or 2.