Fuji Photo Film Company, Limited

Ebara Corporation

Central Glass Company, Limited

Other

Ikeda Glass Industrial Co., Ltd.

Fumi Photo Film Co., Ltd.

Hideo Ikeda

Tadao Sugimoto

Takefumi Hara

Koki Nakamura

Sadanobu Shuto

Kikuichi Mori

Shigeru Ohno

Katsuro Nagaoka

Yasuhiro Shimada

Hiroyuki Mifune

Makoto Suzuki

Mitsuru Yamamoto

Satoshi Nagaoka

Nobuaki Miyasaka

Kazuyoshi Yamakawa

Tetsuro Kojima

Kenichi Kajiwara

Ken-ichi Kajiwara

Sou Kuroiwa

Toshihiro Nishikawa

Sumito Yamada

Yoshihiko Shibahara

Shingo Ishimaru

Shuzo Suga

Nobuyuki Haraguchi

Shinichiro Arakawa

Yoshio Horiki

Morio Yagihara

Tadashi Ito

Tadashi Ikeda

Masaki Okazaki

Keisuke Shiba

Minoru Sakai

Yasuo Mukunoki

Shigeharu Urabe

Mitsuo Saitou

Masato Taniguchi

Takayoshi Mori

Takashi Toyoda

Hiroshi Takehara

Munehisa Fujita

Ryoichi Nemori

Kimiyasu Morimura

Hiroshi Tamaoki

Yutaka Yamauchi

Yasushi Miyamoto

Akimasa Akao

Hiroshi Ayato

Masayuki Kuramitu

Hiroshi Kasamatsu

Hatsushi Shimizu

Toshiyuki Ukita

Ryutaro Konishi

Silver halide photographic emulsion and silver halide photographic lightsensitive material using the same

Silver halide photographic emulsion

A silver halide emulsion containing chemically sensitized silver halide grains, wherein the silver halide grains are prepared by ripening the grains by the addition of (1) fine silver halide grains smaller than the silver halide grains to be digested, (2) a solution containing silver ions, (3) a solution containing halide ions and a solution containing silver ions, or (4) a fine silver halide grain emulsion and a solution containing silver ions, wherein the amount of the addition in terms of silver ion is 0.05 to 8 mol % per mol of silver in the silver halide grains, and the addition is performed after 40% or more of the reaction of chalcogen sensitizer that is added during the chemical sensitization step is completed and before the silver halide grains are optimally ripened.

Silver halide emulsion, method of manufacturing the emulsion, silver halide photosensitive material containing the emulsion, and method of developing the material

A silver halide photosensitive material comprises a compound represented by formula (S1):

Silver halide photosensitive material

There is disclosed a silver halide emulsion that comprises at least a dispersion medium and silver halide grains, wherein 60% or more of the total projected area of the silver halide grains is occupied by tabular grains having an epitaxial junction, which grains each have a {100} face as a main plane and an aspect ratio (diameter/thickness ratio) of from 2.0 to 100; and wherein a right-angled parallelogram enclosed with {100} side faces at the main plane edges on the portion of the tabular grains, which portion does not have the epitaxial junction, or if the tabular grains have at least one corner broken off, a right-angled parallelogram formed by extending the {100} side faces at the main plane edges, has a slenderness side ratio (a ratio of the length of the long side to that of the short side) of 1 to 6; and wherein the tabular grains have the epitaxial junction with a silver halide protrusion that has a higher solubility than the portion of the tabular grains, which portion does not have the epitaxial junction. There is also disclosed a silver halide emulsion the same to the above, except that (A) the tabular grains have no epitaxy but crystal defects for anisotropic growth and an aspect ratio of 2.0 or more, and (B) a six-coordinate dopant capable of forming a shallow electron trap is present in a crystal lattice. The silver halide emulsions are high in sensitivity and image quality, and they are excellent in suppression of dependency on a processing solution pH and in preservability of latent image, and they can be utilized in silver halide color photographic light-sensitive materials.

Silver halide emulsion and silver halide color photographic

There is disclosed a silver halide color photographic material having a red-sensitive silver halide emulsion layer, a green-sensitive silver halide emulsion layer, a blue-sensitive silver halide emulsion layer, which comprises a cyan dye-forming coupler represented by formula (I) and (a) a monodisperse silver halide emulsion, (b) non-photosensitive silver halide emulsion wherein the inside or the surface of grains is fogged, (c) a colloidal silver, (d) negative-type interval latent image-type silver halide grains chemically sensitized to a defined depth from the surface, (e) a sensitizing dye containing a sulfonamide group, (f) three separated layers of high, medium, and low sensitivities, (g) two separated layers each having different content of iodine, (h) grains each having a defined spectral sensitivity distribution and a DIR-hydroquinone, or (i) a DIR-hydroquinone: formula (I) ##STR1## wherein R.sup.1 represents a hydrogen atom or a substituent, R.sup.2 represents a substituent, X represents a hydrogen atom or a group capable of being released upon a coupling reaction of the coupler represented by formula (I) with the oxidized product of a color-developing agent, and Z.sup.1 represents a group of nonmetallic atoms required for forming a nitrogen-containing 6-membered heterocyclic ring, which contains at least one group capable of being dissociated.

Silver halide color photographic material

A method for producing a silver halide emulsion, said method comprising: adding silver nitrate to a halogen compound to form an emulsion grain; and doping a non-labile selenium compound in an amount, in terms of selenium added, of from 1.0.times.10.sup.-8 to 1.0.times.10.sup.-6 mol per a unit surface area of 1 m.sup.2 of said emulsion grain, at the time when from 10 to 49% of the total silver amount used for the formation of said emulsion grain is added.

Method for producing silver halide emulsion doped with a non-labile

A light-sensitive silver halide emulsion contains tabular silver halide grains with an equivalent-circle diameter/thickness ratio of 8 to 100. In this light-sensitive silver halide emulsion, a variation coefficient of a grain size distribution of the tabular silver halide grains is 1% to 20%, and 50% or more (number) of all of the tabular silver halide grains are grains whose ratio, b/a, of a longest distance, a, between two or more twin planes of the tabular silver halide grain to a grain thickness, b, is 1.5.ltoreq.b/a&lt;5.

Light-sensitive silver halide emulsion and photographic light-sensitive

There is disclosed a silver halide color photographic material having a red-sensitive silver halide emulsion layer, a green-sensitive silver halide emulsion layer, a blue-sensitive silver halide emulsion layer, which comprises a cyan dye-forming coupler represented by formula (Ia) and (a) a sensitizing dye containing a sulfonamide group, (b) negative-type internal latent image-type silver halide grains chemically sensitized to a defined depth from the surface, (c) grains each having a defined spectral sensitivity distribution and a DIR-hydroquinone, (d) a monodisperse silver halide emulsion, (e) non-photosensitive silver halide emulsion wherein the inside or the surface of grains is fogged, (f) a colloidal silver, or (g) a DIR-hydroquinone: formula (Ia) ##STR1## wherein the substituents are as defined herein the specification.

A method of retaining or multiplying vector DNA stably in an Escherichia coli host comprising the step of culturing the host having both recA and recJ mutations containing said vector.

Method of multiplying a vector in E. coli host

A silver halide light-sensitive emulsion and a silver halide light-sensitive material containing the same are disclosed, in which silver halide emulsion grains composed of an internal nucleus of silver bromide or silver iodobromide having a silver iodide content of not more than 1 mol % having provided thereon, in the order described, a first coating layer of silver iodobromide having a silver iodide content of from 2 to 20 mol % and a second coating layer of silver iodobromide or silver bromide a silver iodide content of which is lower than that of said first coat and is not more than 3 mol %, and are further composed of iodide phrases which are formed by halogen conversion with an iodide ion, by addition of silver iodide fine grains or by addition of a silver ion and an iodide ion at any stage during formation of 3 to 97% of the total amount of silver and after completion of the formation of the second coating layer.

Silver halide light-sensitive emulsion and silver halide light-sensitive

An emulsion contains tabular silver halide having a thickness of less than 0.5 .mu.m, a diameter of 0.3 .mu.m or more, and a grain diameter/thickness ratio of 2 or more. The tabular silver halide grains account for at least 50% of a total projected area of all silver halide grains. 50% (number) or more of the tabular silver halide grains include 10 or more dislocations per grain. A relative standard elevation of silver iodide content of individual tabular silver halide 30% or less. This light-sensitive silver halide emulsion has a high sensitivity and a high gamma improved in photographic properties and in rate of development. Each tabular silver halide grain may internally have a portion where a silver iodide content is higher than that of the surface of the grain. When the light-sensitive silver halide emulsion is added to a silver halide emulsion layer, a photographic light-sensitive material having a high sensitivity and a high gamma and improved in photographic properties and in rate of development can be obtained.

Silver halide emulsion and photographic light-sensitive material using

A silver halide photographic emulsion contains tabular silver halide grains having an aspect ratio of 2 or more in an amount of 70% or more of a total projected area of all grains. A variation coefficient of the grain size distribution of all silver halide grains is 20% or less, a signal having at least two peaks is present in a diffraction angle range of less than 1.5 degree at a maximum peak height.times.0.13 of a (420) X-ray diffraction signal obtained using the K.sub..alpha. line of Cu, and a peak interval thereof is 0.1 degree or more in terms of the diffraction angle.

Silver halide photographic emulsion and silver halide photographic

There is disclosed a silver halide color photographic material having a red-sensitive silver halide emulsion layer, a green-sensitive silver halide emulsion layer, a blue-sensitive silver halide emulsion layer, which comprises a cyan dye-forming coupler represented by formula (Ia) and (a) a sensitizing dye containing a sulfonamide group, (b) negative-type internal latent image-type silver halide grains chemically sensitized to a defined depth from the surface, (c) grains each having a defined spectral sensitivity distribution and a DIR-hydroquinone, (d) a monodisperse silver halide emulsion, (e) non-photosensitive silver halide emulsion wherein the inside or the surface of grains is fogged, (f) a colloidal silver, or (g) a DIR-hydroquinone: ##STR1## wherein Za represents --NH-- or --CH(R.sub.3)--, Zb and Zc each represent --C(R.sub.4).dbd. or --N.dbd., R.sub.1, R.sub.2, and R.sub.3 each represent an electron-attracting group wherein the Hammett substituent constant .sigma..sub.p value is 0.20 or more, provided that the sum of the .sigma..sub.p value of R.sub.1 and the .sigma..sub.p value of R.sub.2 is 0.65 or more, R.sub.4 represents a hydrogen atom or a substituent, if there are two groups R.sub.4 in the formula, they may be the same or different, and X represents a hydrogen atom or a group capable of being released upon a coupling reaction with the oxidized product of an aromatic primary amine color-developing agent, provided that R.sub.1, R.sub.2, R.sub.3, R.sub.4, or X may be a divalent group to form a homopolymer or a copolymer by bonding with a dimer or higher polymer or polymer chain.

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Minami-ashigara, Japan

Hideo Ikeda