Abstract: An object of the present invention is to provide a cell culture method having an excellent cell proliferation property, an antibody production method using the above method, an organic acid removal method using the above method, and an antibody produced by the above method. The cell culture method of the present invention is a cell culture method including a metabolic decomposition product removal step of bringing a culture solution containing a metabolic decomposition product into contact with a polymer having a quaternary ammonium base group or an amino group and removing the metabolic decomposition product from the culture solution to a purified culture solution and a cell culture step of culturing cells using the purified culture solution.

Abstract: An emulsion of a nitrogen atom-containing polymer or salt thereof and a method for producing it are provided. The emulsion has high stability and low dispersity of the particle diameter of emulsified particles. A method for producing particles including a crosslinked nitrogen atom-containing polymer or sat thereof using the emulsion is also provided. The method for producing the emulsion includes a step of mixing a first solution that includes a nitrogen atom-containing polymer or salt thereof and a hydrophilic solvent and has a viscosity of 10 to 2,000 mPa·s, and a second solution that includes a hydrophobic solvent and has a viscosity of 1 to 100 mPa·s, stirring the mixture, and thus obtaining an emulsion of the nitrogen atom-containing polymer or salt thereof, wherein a ratio between the viscosity of the first and second solutions is in a range of 0.1:1 to 300:1.

Abstract: Provided are an ink set including: an ink composition which contains a colorant and water, and a treatment liquid which contains water-insoluble resin particles having a constitutional unit derived from a first monomer that contains at least one group selected from a sulfo group and a salt of the sulfo group and a constitutional unit derived from a second monomer that has at least one structure selected from an aromatic ring structure and an alicyclic structure, a compound that causes the colorant in the ink composition to aggregate, and water; and an image recording method.

Abstract: Provided are an emulsion of a nitrogen atom-containing polymer or a salt thereof, the emulsion having high emulsion stability and having a low dispersity of the particle diameter of emulsified particles, and a method for producing the emulsion. Also provided is a method for producing particles including a crosslinked nitrogen atom-containing polymer or a salt thereof by using the emulsion described above.

Abstract: Provided are an ink set including: an ink composition which contains a colorant and water, and a treatment liquid which contains water-insoluble resin particles having a constitutional unit derived from a first monomer that contains at least one group selected from a sulfo group and a salt of the sulfo group and a constitutional unit derived from a second monomer that has at least one structure selected from an aromatic ring structure and an alicyclic structure, a compound that causes the colorant in the ink composition to aggregate, and water; and an image recording method.

Abstract: Provided is an ink set including an ink composition which contains a colorant and water; and a treatment liquid which contains water-insoluble resin particles in which the content of a carboxy group or a salt of the carboxy group is in a range of 1.0 mmol to 7.0 mmol per 1 g of the water-insoluble resin particles, a compound that causes the colorant in the ink composition to aggregate, and water.

Abstract: An ink composition contains (a) a compound which is represented by the following Formula (1) and has a specific molecular weight, (b) a colorant, (c) a polymer having an SP value of equal to or greater than 17 and equal to or less than 24, and (d) water, in which there is a specific relationship between a log P value of the component (a) and an SP value of the component (c). An ink set contains the ink composition, and an ink jet recording method uses the ink composition: R represents a specific alkyl group; Z1 represents a single bond, —NR1—, or —O—; Z2 represents —NR1— or —O—; at least one of Z1 or Z2 is —NR1—; R1 represents a hydrogen atom or a specific alkyl group; and L represents a specific alkylene group or —C2H4—O—C2H4—.

Abstract: A method for manufacturing an ?-bromoacetophenone compound includes brominating a specific phenyl compound by reacting the specific phenyl compound with bromine in a solvent including at least one organic acid ester compound so as to obtain the ?-bromoacetophenone compound that is a liquid at 5° C. to 30° C.

Abstract: An ink set including an ink composition including resin particles, a colorant, and water, and a treatment solution including an anionic surfactant, water, and a compound configured to aggregate at least one of the colorant or the resin particles in the ink composition, in which the ratio of the content of the anionic surfactant with respect to the content of the compound configured to aggregate at least one of the colorant or the resin particles is 0.001 to 0.600 in terms of mass. An image forming method in which the ink set is used.

Abstract: An ink composition contains (component A) a high-molecular-weight polymerization initiator having a weight-average molecular weight of equal to or greater than 1,000, (component B) a polymerizable compound, and (component C) a colorant, in which the component A has an acylphosphine oxide structure, and the acylphosphine oxide structure is linked to a main chain or a core of the component A on the side of an acyl group thereof.

Abstract: Provided is an ink set including an ink composition which contains a colorant and water; and a treatment liquid which contains water-insoluble resin particles in which the content of a carboxy group or a salt of the carboxy group is in a range of 1.0 mmol to 7.0 mmol per 1 g of the water-insoluble resin particles, a compound that causes the colorant in the ink composition to aggregate, and water.

Abstract: A method for producing an ?-halogenoacetophenon compound includes reacting a specific ?-halogenocarboxylic halide compound and a specific phenyl compound in the presence of a Lewis acid in a solvent, in which the ?-halogenoacetophenon compound and the phenyl compound are reacted with each other in a molar ratio of the Lewis acid to the phenyl compound represented below.

Abstract: A method for manufacturing an ?-bromoacetophenone compound includes brominating a specific phenyl compound by reacting the specific phenyl compound with bromine in a solvent including at least one organic acid ester compound so as to obtain the ?-bromoacetophenone compound that is a liquid at 5° C. to 30° C.

Abstract: An ink composition contains (a) a compound which is represented by the following Formula (1) and has a specific molecular weight, (b) a colorant, (c) a polymer having an SP value of equal to or greater than 17 and equal to or less than 24, and (d) water, in which there is a specific relationship between a log P value of the component (a) and an SP value of the component (c). An ink set contains the ink composition, and an ink jet recording method uses the ink composition: R represents a specific alkyl group; Z1 represents a single bond, —NR1—, or —O—; Z2 represents —NR1— or —O—; at least one of Z1 or Z2 is —NR1—; R1 represents a hydrogen atom or a specific alkyl group; and L represents a specific alkylene group or —C2H4—O—C2H4—.

Abstract: An ink set including an ink composition including resin particles, a colorant, and water, and a treatment solution including an anionic surfactant, water, and a compound configured to aggregate at least one of the colorant or the resin particles in the ink composition, in which the ratio of the content of the anionic surfactant with respect to the content of the compound configured to aggregate at least one of the colorant or the resin particles is 0.001 to 0.600 in terms of mass. An image forming method in which the ink set is used.

Abstract: A method for producing an ?-halogenoacetophenon compound includes reacting a specific ?-halogenocarboxylic halide compound and a specific phenyl compound in the presence of a Lewis acid in a solvent, in which the ?-halogenoacetophenon compound and the phenyl compound are reacted with each other in a molar ratio of the Lewis acid to the phenyl compound represented below.

Abstract: An ink composition contains (component A) a high-molecular-weight polymerization initiator having a weight-average molecular weight of equal to or greater than 1,000, (component B) a polymerizable compound, and (component C) a colorant, in which the component A has an acylphosphine oxide structure, and the acylphosphine oxide structure is linked to a main chain or a core of the component A on the side of an acyl group thereof.

Abstract: There is provided a lithographic printing plate precursor that enables image recording using a laser and that provides an excellent scumming resistance and an excellent developability while maintaining a satisfactory printing durability. Also provided are a platemaking method, and a novel polymerizable monomer. A lithographic printing plate precursor has a support, and an image recording layer disposed thereon and containing a radical polymerization initiator and a polymerizable monomer that has a sulfonamide group and at least two ethylenically unsaturated groups; a lithographic printing plate platemaking method uses this lithographic printing plate precursor; and a polymerizable monomer has a sulfonamide group and at least two ethylenically unsaturated groups.

Abstract: The inkjet ink composition includes (Component A) a polymerizable compound, (Component B) a polymerization initiator, and (Component C) a vegetable oil, in which the component B contains a compound represented by the formula (1) or (2).

Abstract: A lithographic printing plate precursor includes a support, and an image-recording layer, the image-recording layer contains a urethane resin having a polyalkylene oxide chain represented by the formula (1) as defined herein in a side chain, an infrared absorbing agent, a radical polymerizable compound and a radical polymerization initiator, and an unexposed area of the image-recording layer is capable of being removed with at least one of dampening water and ink.