Abstract: An object of the present invention is to realize an antibody or a fragment thereof specifically recognizing a cofilin 1 protein, and a method for detecting and testing gastrointestinal cancer with high detection performance, which comprises performing immunoassay of the cofilin 1 protein using the antibody or a fragment thereof. An immunoassay of cofilin 1 protein is characterized by measuring cofilin 1 or a fragment thereof in a sample using 2 or more types of anti-cofilin 1 monoclonal antibody or fragments thereof specifically recognizing different peptide regions in the amino acid sequence constituting the cofilin 1 protein.

Abstract: A method of producing a chemical includes a fermentation step that converts a fermentation feedstock, through fermentation by culturing a microorganism or culture cells, into a fermented liquid containing the chemical, and a membrane separation step that collects the chemical, as a filtrate, from the fermented liquid with the use of two or more separation membrane modules, and returning the non-filtered liquid to the fermented liquid, wherein in the membrane separation step, timing of the filtration-stop treatment for each separation membrane module is controlled when an intermittent filtration operation including alternately repeating a filtration treatment and a filtration-stop treatment is performed with plural separation membrane modules.

Abstract: A method produces a concentrated aqueous sugar solution using a cellulose-containing biomass as a raw material, including: (1) hydrolyzing a cellulose-containing biomass to produce an aqueous sugar solution; (2) filtering the aqueous sugar solution obtained in (1) through a microfiltration membrane and/or an ultrafiltration membrane, and recovering an aqueous sugar solution from the permeate side; and (3) filtering the aqueous sugar solution obtained in (2) through a reverse osmosis membrane, recovering a permeate from the permeate side and recovering a concentrated aqueous sugar solution from the feed side; wherein at least a part of the permeate from the reverse osmosis membrane is used as a hydrothermal treatment liquid, biomass-suspending, liquid, enzyme-diluting liquid, acid-diluting liquid and/or alkali-diluting liquid in (1).

Abstract: It is intended to provide a method for detecting gastric cancer, which is low invasive to a human test subject and has high detection sensitivity and accuracy. The present invention provides a method comprising measuring in vitro the amount of Cofilin 1 protein, a variant thereof, and/or a fragment thereof in a body fluid sample derived from a human test subject, and detecting the presence or absence of gastric cancer affecting the test subject on the basis of the amount, and a kit for gastric cancer diagnosis comprising an antibody capable of specifically binding to the protein.

Abstract: It is intended to provide a method for detecting gastric cancer, which is low invasive to a human test subject and has high detection sensitivity and accuracy. The present invention provides a method comprising measuring in vitro the amount of COTL1 protein, a variant thereof, and/or a fragment thereof in a body fluid sample derived from a human test subject, and detecting the presence or absence of gastric cancer affecting the test subject on the basis of the amount, and a kit for gastric cancer diagnosis comprising an antibody capable of specifically binding to the protein.

Abstract: An object of the present invention is to detect a human CXCL1 protein with high sensitivity. An immunoassay method is provided for a human CXCL1 protein, by which human CXCL1 or a fragment thereof in a sample is measured using two or more types of anti-human CXCL1 monoclonal antibodies or fragments thereof, wherein: each of the two or more types of anti-human CXCL1 monoclonal antibodies or fragments thereof specifically recognizes any one of sequence regions of the amino acid sequences shown in SEQ ID NOS: 1-3, which are partial sequences of the amino acid sequence composing a human CXCL1 protein; and the two or more types of anti-human CXCL1 monoclonal antibodies or fragments thereof specifically recognize sequence regions that differ from each other. Monoclonal antibodies or fragments thereof are provided, each of which specifically recognizes any one sequence region of the amino acid sequences shown in SEQ ID NOS: 1-3 and has a new amino acid sequence.