Abstract: A process of preparing a high bromide tabular grain emulsion comprising a dispersion medium and silver halide grains including tabular grains having {111} major faces and an aspect ratio of at least 2, which contain greater than 50 mole percent bromide, based on silver, and which account for greater than 50 percent of total grain projected area, where such tabular grains have an average aspect ratio of at least 5, the process comprising (i) in a grain nucleation step creating in a dispersing medium tabular silver halide grain nuclei containing parallel twin planes and (ii) in a grain growth step subsequently growing the tabular grain nuclei into tabular grains in a silver halide reaction vessel by adding a silver ion source and a halide ion source to the reaction vessel and precipitating silver halide onto the tabular grain nuclei, wherein thiocyanate ion is introduced into the silver halide reaction vessel prior to the addition of at least the final 10 mole percent of the total silver added to the

Abstract: A silver halide photographic element comprises at least one silver halide emulsion layer comprising a silver halide emulsion comprising core/shell silver halide grains wherein the core region comprises silver bromide with from about 5 to about 20% silver iodide and the shell region comprises silver bromide with about 0.1 to about 10% silver iodide and said layer contains a fragmentable electron donor compound of the formula X—Y′ or a compound which contains a moiety of the formula —X—Y′; wherein X is an electron donor moiety, Y′ is a leaving proton H or a leaving group Y, with the proviso that if Y′ is a proton, a base, &bgr;−, is covalently linked directly or indirectly to X, and wherein: 1) X—Y′ has an oxidation potential between 0 and about 1.

Abstract: The invention relates to an emulsion comprising chemically and spectrally sensitized silver halide grains having formate on the surface of said grams.

Abstract: This invention comprises a photographic element comprising a support and at least one blue sensitive silver halide emulsion layer containing a tabular grain silver halide emulsion, or an emulsion in which the halide content is at least 50% chloride and no more than 5% iodide, wherein the emulsion is spectrally sensitized with at least one dye providing a peak sensitization between 446 and 500 nm and at least one dye providing a peak sensitization between 400 and 445 nm and additionally sensitized with a fragmentable electron donor of the formula: X—Y′. or an electron donor which contains an —XY′ moiety; wherein X is an electron donor moiety, Y′ is a leaving proton H or a leaving group Y, with the proviso that if Y′ is H a base, &bgr;−, is covalently linked directly or indirectly to X. and wherein: 1) X—Y′ has an oxidation potential between 0 and about 1.

Abstract: This invention relates to a silver halide photographic element comprising at least one silver halide emulsion layer and further comprising an antifoggant represented by the following Structure I: wherein R1 is an aliphatic or cyclic group, R2 and R3 are independently hydrogen or bromine as long as at least one of them is bromine, L is a divalent linking group, m and n are independently 0 or 1, and SG is a solubilizing group that has a pKa of 8 or less.

Abstract: The invention relates to an emulsion comprising bromide grains wherein said grains are chemically sensitized with a water soluble Au(I) complex having the formula [L—Au—L]M wherein the complex is symmetrical; L is an organomercapto ligand which has antifogging, stabilizing, or sensitizing properties, and M is a cationic counter ion and a rapid sulfiding agent represented by structure SS-1: wherein each of the R1, R2, R3, and R4 groups independently represents an alkylene, cycloalkylene, carbocyclic arylene, heterocyclic arylene, alkarylene or aralkylene group; or taken together with the nitrogen atom to which they are attached, R1 and R2 or R3 and R4 can complete a 5- to 7-membered heterocyclic ring; and each of the B1, B2, B3, and B4 groups independently is hydrogen or represents a carboxylic, sulfinic, sulfonic, hydroxamic, mercapto, sulfonamido or primary or secondary amino nucleophilic group, with the proviso that at least one of the B1R1 to B4R4 groups contains

Abstract: A photographic element comprises a support bearing a cyan dye image-forming unit comprising at least one red-sensitive silver halide emulsion layer having associated therewith at least one cyan dye-forming coupler, a magenta dye image-forming unit comprising at least one green-sensitive silver halide emulsion layer having associated therewith at least one magenta dye-forming coupler, a yellow dye image-forming unit comprising at least one blue-sensitive silver halide emulsion layer having associated therewith at least one yellow dye-forming coupler, wherein at least one of said emulsion layers comprises a) an emulsion with 3D, core/shell grains of at least 0.

Abstract: This invention relates to a method of reducing fog in a silver halide emulsion comprising taking a high fogging emulsion which has been chemically sensitized and cooled, holding the high fogging emulsion in the form of a melt in preparation for coating on a support, and prior to or during said holding, contacting the emulsion with an isothiazolin-one compound represented by the following formula wherein R1 is a substituent; and Z contains the carbon atoms necessary to form a substituted or unsubstituted non-aromatic ring. It also relates to silver halide photographic elements containing such emulsions.

Abstract: The invention relates to a photographic element wherein at least one layer comprises silver halide grains wherein said grains have a surface iodide of less than 0.6 mol percent, total grain iodide of about 1.0 to 10 mol percent, said iodide being introduced in the core of the grains, an alkynylamine compound of Formula I: ##STR1## wherein X represents oxygen, sulfur, selenium, or an unsubstituted or alkyl substituted nitrogen; R.sup.1 represents hydrogen or an alkyl of from 1 to 5 carbon atoms, and R.sup.2 represents hydrogen, or an alkyl, aryl, heteroaryl, carbocyclic or heterocyclic group, and R.sup.3 and R.sup.4 independently represent hydrogen, halogen, or a substituted or unsubstituted alkyl or alkoxy group, preferably one having fewer than 6 carbon atoms, and the reductone of Formula II ##STR2## wherein R.sub.1 and R.sub.2 are the same or different, and may represent H, alkyl, cycloalkyl, aryl, or an alkyl group with a solubilizing group such as --OH, sulfonamide, sulfamoyl, or carbamoyl, R.sub.1 and R.

Abstract: This invention relates to silver halide photographic element comprising a silver halide emulsion chemically sensitized in the presence of an isothiazolin-one compound represented by the formula ##STR1## wherein R.sup.1 is a substituent; and Z is a substituted or unsubstituted saturated ring, wherein the isothiazolin-one compound was added after precipitation of the emulsion.

Abstract: A color photographic negative element which has a transparent base and a blue sensitive silver halide emulsion layer. The foregoing blue sensitive layer meets each of the following spectral sensitivity requirements:S.sub.max (426-444 nm) .gtoreq.65%S.sub.max(400-500 nm)IS.sub.(425-450) .gtoreq.25%(IS.sub.(400-500))in which S.sub.max(426-444 nm) is the maximum sensitivity between 426 to 444 nm, S.sub.max(400-500 nm) is the maximum sensitivity between 400-500 nm, IS.sub.(425-450) is the integrated spectral sensitivity of the blue sensitive layer from 425 to 450 nm, and IS.sub.(400-500) is the integrated spectral sensitivity of the blue sensitive layer in the region 400-500 nm. A method for printing a negative obtained from exposing and processing an element of the foregoing type, on automatic printers which automatically compensate for color bias, is also provided.

Abstract: A photographic element comprising a support having situated thereon a silver halide emulsion, the emulsion comprising an alkynylamine compound of the formula: wherein Z represents atoms necessary to complete a 5 to 10-membered heterocyclic ring system, R.sup.1 represents hydrogen or an alkyl of from 1 to 5 carbon atoms, and R.sup.2 represents hydrogen, or an alkyl, aryl, heteroaryl, carbocyclic or heterocyclic group; andat least one dihydroxy aryl compound represented by formula II or III: ##STR1## wherein R.sup.3 to R.sup.12 are independently selected from the group consisting of hydrogen, hydroxy, sulfonate, or an alkyl of from 1 to 5 carbon atoms, and wherein at least two of such groups represent a hydroxy group.

Abstract: The invention is generally accomplished by providing a method of finishing an emulsion comprising providing silver halide grains, adding to said emulsion in an amount between about 0.005 mmol/per mole of silver and 0.10 mmol/per mole of silver of the compound ##STR1## X=O, S, Se; R.sub.1 =alkyl or substituted alkyl or aryl or substituted aryl;Y.sub.1 and Y.sub.2 individually represent hydrogen, alkyl groups or an aromatic nucleus or together represent the atoms necessary to complete a cyclic structure containing carbon, oxygen, selenium, or nitrogen atoms necessary to complete a fused aromatic nucleus or an alicyclic structure. The invention also provides a photographic element comprising the silver halide emulsion. In a preferred embodiment, the R.sub.1 substituent is methyl or phenyl.

Abstract: A dry multilayer analytical element for assaying transaminases wherein the analytical element comprises:a) a transaminase substrate;b) reagents that generate pyruvate in the presence of a transaminase and the transaminase substrate;c) pyruvate oxidase and cofactors for pyruvate oxidase; andd) reagents that generate a color in proportion to a concentration of hydrogen peroxide;and wherein the analytical element has, in the following order, a spreading layer, a reagent layer, and a support whereini) the spreading layer contains the transaminase substrate and a material selected from the group consisting of polymer beads, barium sulfate, titanium oxide, and mixtures thereof;ii) the reagent layer contains the pyruvate oxidase; andiii) both a hardened gelatin layer and a subbing layer separate the reagent layer from the spreading layer.

Abstract: An analytical element has a peroxidase-labeled ligand analog distributed within a water-soluble binder composition comprising at least about 50 percent, by weight, of poly(vinyl alcohol). As a result, the peroxidase retains more of its stability prior to use. Such elements can be used to determine any of a number of immunologically reactive analytes, such as digoxin.

Abstract: A polyacrylamide type gel medium for electrophoresis is conveniently and safely prepared prior to use by crosslinking a water-soluble copolymer of an acrylamide monomer and at least one comonomer copolymerizable therewith, which comonomer contains an active methylene group that will enter into a crosslinking reaction that does not involve a free radical vinyl addition mechanism.

Abstract: An analytical element has a peroxidase-labeled ligand analog distributed within a layer comprising from 0.1 to 10.0 g/m.sup.2 of poly(vinyl-alcohol) and from 0.2 to 20.0 g/m.sup.2 of glycerol. The concentration of the glycerol must be greater than 1 times the concentration of poly(vinylalcohol) in the layer. As a result, the peroxidase retains more of its stability prior to use. Such elements can be used to determine a number of different immunologically reactive analytes, such as digoxin.

Abstract: A composition of a polysaccharide with a detectable material appended thereto and a 1,3-dione having a methylene group between the two carbonyls of the 1,3-dione, which methylene group has at least one ionizable hydrogen, provides accurate results in assays of hydrolyzing enzymes such as amylase. The composition can be incorporated in the reagent zone of a dry test element having a reagent zone and a registration zone.

Abstract: A dry element capable of use for the analysis or transport of liquids comprises an isotropically porous zone which comprises a blush polymer having dispersed therein a particulate material and a nonpolymeric heterocyclic, aliphatic or carbocyclic quaternary ammonium compound comprising at least 12 carbon atoms therein. This compound is present in the porous zone in an amount of at least about 2 weight percent, based on the dry weight of the blush polymer. The porous zone of this element has improved cohesive strength which improves its resistance to abrasion. The element can be used to determine an analyte in an aqueous liquid, such as biological fluids.

Abstract: A multizone analytical element for the determination of an analyte in an aqueous liquid comprises a registration zone and a porous spreading zone to receive and transport the aqueous liquid. The spreading zone contains a nonpolymeric quaternary ammonium compound represented by either of the structures: ##STR1## wherein represents a single or double bond; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently alkyl; aryl; cycloalkyl; or alkaryl; provided that R.sub.1, R.sub.2, R.sub.3 and R.sub.4 together comprise at least 12 carbon atoms; or R.sub.1 and R.sub.2 taken together with the nitrogen atom, form a quaternary 5- to 16-membered heterocyclic ring; or R.sub.1, R.sub.2 and R.sub.3 taken together with the nitrogen atom, form a quaternary 5- to 16-membered heterocyclic ring; and X.sup.- is a monovalent anion.