Abstract: One aspect of the present invention relates to a recovery method of 226Ra, and the recovery method of 226Ra includes a step (A1) of immersing a solid-state 226Ra containing substance and a carrier having a function of adsorbing 226Ra ions in a processing solution, and then irradiating the processing solution with ultrasonic waves.

Abstract: A rubber additive composition may be capable of producing a rubber composition having well-balanced strength. Such rubber additive compositions may include: (A) anion-modified cellulose and (B) a hydrophobizing agent, wherein the hydrophobizing agent (B) includes at least one selected from the group consisting of (B1) a polyether amine having a primary amino group at an end of a polyether skeleton and (B2) an amine compound having a hydrocarbon group with a carbon number of 3 to 50 or a quaternary ammonium salt having a hydrocarbon group with a carbon number of 3 to 50.

Abstract: An object of the present invention is to provide a rubber composition that has tensile strength at break and tensile elongation superior to a rubber composition produced without mixing a cellulose nanofiber and to provide a latex immersion liquid that is a raw material for the rubber composition and is used at a latex immersion step. Namely, the present invention provides a latex immersion liquid that includes (1) a rubber latex, (2) a modified cellulose nanofiber having an average fiber length of 200-400 nm, and (3) a defoaming agent and also provides a rubber composition produced through a latex immersion step using the obtained latex immersion liquid.

Abstract: An object of the present invention is to provide a rubber composition including a rubber component and cellulose-based fibers and having excellent strength. Namely, the present invention provides a rubber composition including Component (A): a modified cellulose nanofiber, Component (B): a surfactant, Component (C): a polyvalent metal, and Component (D): a rubber component and a method for producing the same. Component (A) preferably includes a carboxy group-containing cellulose nanofiber such as an oxidized cellulose nanofiber and a carboxymethylated cellulose nanofiber.

Abstract: The present invention aims to provide a rubber composition having sufficient reinforcement and fatigue resistance even when a large strain is applied thereto, and the present invention is to provide a substituted carboxy group-containing modified cellulose nanofiber wherein at least part thereof has at least any one of a substituent represented by Formula (a): —CONH—R1 and a substituent represented by Formula (b): —COO—R1 (in Formulae (a) and (b), R1 is independently a C3-30 hydrocarbon having at least one unsaturated bond), and a rubber composition including the same.

Abstract: Disclosed herein is method for preparing a masterbatch by dispersing chemically modified cellulose nanofibers having carboxy groups under acidic conditions and then mixing the dispersed cellulose nanofibers with rubber latex. More specifically, the present disclosure provides a method for producing a masterbatch, including: (A) a step of introducing a carboxy group to a cellulose-based raw material to prepare a modified cellulose; (B) a step of carrying out defibration treatment and dispersion treatment of the modified cellulose to prepare a cellulose nanofiber; (C) a step of acidifying the cellulose nanofiber to prepare an acid type cellulose nanofiber; and (D) a step of mixing the acid type cellulose nanofiber and a rubber component. The rubber composition having excellent strength such as tensile strength can be provided by using the obtained masterbatch.

Abstract: An object of the present invention is to provide a rubber composition including a rubber component and cellulose-based fibers and having excellent strength. Namely, the present invention provides a rubber composition including Component (A): a modified cellulose nanofiber, Component (B): a surfactant, Component (C): a polyvalent metal, and Component (D): a rubber component and a method for producing the same. Component (A) preferably includes a carboxy group-containing cellulose nanofiber such as an oxidized cellulose nanofiber and a carboxymethylated cellulose nanofiber.

Abstract: The present invention aims to provide a method for producing a masterbatch with improved rubber physical properties such as tensile strength at break, rigidity, and fuel economy at high productivity by enhancing the amount of fillers incorporated into rubber and the dispersibility of fillers in rubber, as well as related products. The present invention relates to a method for producing a masterbatch, including: step (1) of mixing a rubber latex having a zeta potential of ?100 to ?20 mV with a filler dispersion having a zeta potential of ?120 to ?10 mV to prepare a latex compound; step (2) of adjusting the zeta potential of the latex compound obtained in step (1) to ?30 to 0 mV; and step (3) of solidifying the coagulum obtained in step (2) with an organic solvent.

Abstract: The present invention aims to provide a rubber composition having sufficient reinforcement and fatigue resistance even when a large strain is applied thereto, and the present invention is to provide a substituted carboxy group-containing modified cellulose nanofiber wherein at least part thereof has at least any one of a substituent represented by Formula (a): —CONH—R1 and a substituent represented by Formula (b): —COO—R1 (in Formulae (a) and (b), R1 is independently a C3-30 hydrocarbon having at least one unsaturated bond), and a rubber composition including the same.

Abstract: A process for preparing a master batch, comprising: the step of filtrating a dispersion of cellulose nanofibers under pressure or under reduced pressure with a filtration pressure differential of 0.01 MPa or more; and the step of mixing cellulose nanofibers obtained by the filtration step and rubber component is provided. A master batch can be provided to provide a rubber composition with improved mechanical strengths by the invention.

Abstract: The present invention aims to provide a rubber composition which has further enhanced dispersion of microfibrillated cellulose in rubber to provide excellent processability and further to provide excellent rigidity, tensile properties, and fuel economy while maintaining a good balance between them. The present invention also aims to provide a pneumatic tire formed from the rubber composition with high productivity which provides excellent handling stability, durability, and rolling resistance properties while maintaining a good balance between them. The rubber composition of the present invention contains: a rubber component; a chemically modified microfibrillated cellulose; and a filler, the chemically modified microfibrillated cellulose having a structure in which the hydroxyl hydrogen atoms of microfibrillated cellulose are partly substituted with a cationic group of a cationic group-containing compound.

Abstract: Disclosed herein is method for preparing a masterbatch by dispersing chemically modified cellulose nanofibers having carboxy groups under acidic conditions and then mixing the dispersed cellulose nanofibers with rubber latex. More specifically, the present disclosure provides a method for producing a masterbatch, including: (A) a step of introducing a carboxy group to a cellulose-based raw material to prepare a modified cellulose; (B) a step of carrying out defibration treatment and dispersion treatment of the modified cellulose to prepare a cellulose nanofiber; (C) a step of acidifying the cellulose nanofiber to prepare an acid type cellulose nanofiber, and (D) a step of mixing the acid type cellulose nanofiber and a rubber component. The rubber composition having excellent strength such as tensile strength can be provided by using the obtained masterbatch.

Abstract: A client terminal transmits a signal related to an authentication request to a service delivery server through a browser every time an application is started by an instruction from a user. Upon receiving the authentication request from the client terminal, an authentication server executes authentication processing in cooperation with the service delivery server based on authentication information of an application of the client terminal, a session of which has been established, and stored in the service delivery server, and user information related to the user stored in the authentication server.

Abstract: A client terminal transmits a signal related to an authentication request to a service delivery server through a browser every time an application is started by an instruction from a user. Upon receiving the authentication request from the client terminal, an authentication server executes authentication processing in cooperation with the service delivery server based on authentication information of an application of the client terminal, a session of which has been established, and stored in the service delivery server, and user information related to the user stored in the authentication server.

Abstract: A completely novel glutaminase is provided: (a) a protein consisting of an amino acid sequence represented by SEQ ID NO: 2, or (b) a protein consisting of an amino acid sequence derived from the amino acid sequence represented by SEQ ID NO: 2 by deletion, substitution or addition of one or more amino acids, and possessing glutaminase activity. This protein is a novel glutaminase possessing excellent thermostability and the like.

Abstract: Provided are a protein comprising the amino acid sequence as shown in SEQ ID NO: 2 and having prolidase activities, a prolidase gene coding for the protein, a prolidase gene comprising the nucleotide sequence as shown in SEQ ID NO: 1, recombinant DNA having the gene inserted into vector DNA, and a transformant or transductant comprising the recombinant DNA, and a method for producing prolidase using the transformant or transductant. The present invention can improve the prolidase through protein engineering. The present invention can be also used for improving microorganisms used in the production of enzymes for food processing and fermented foods.

Abstract: Glutaminase which comprises (a) a protein comprising an amino acid sequence shown in SEQ ID NO: 2, or (b) a protein which comprises an amino acid sequence having deletion, substitution, or addition of one or plurality of amino acids relative to the amino acid sequence (a), and has glutaminase activity. A glutaminase gene which encodes (a) a protein comprising an amino acid sequence shown in SEQ ID NO: 2, or (b) a protein which comprises an amino acid sequence having deletion, substitution, or addition of one or a plurality of amino acids relative to the amino acid sequence (a), and has glutaminase activity. The present invention enables glutaminase to be produced efficiently and thus greatly contributes to the relevant industries.

Abstract: There are disclosed a protein having an amino acid sequence shown in SEQ ID NO:2, or a protein having a glutaminase activity in which one or more amino acids is/are deleted from, substituted by, inserted to or added to the amino acid sequence of the above protein; a gene containing DNA encoding the above protein or a gene which hybridizes with the a complementary sequence of DNA of the above gene under a stringent condition and encodes a protein having a glutaminase activity; a recombinant DNA containing the above gene; a transformant or a transductant containing the above recombinant DNA; and a process for producing glutaminase which comprises culturing the above transformant or the above transductant and collecting glutaminase from a culture medium.

Abstract: A completely novel glutaminase is provided: (a) a protein consisting of an amino acid sequence represented by SEQ ID NO: 2, or (b) a protein consisting of an amino acid sequence derived from the amino acid sequence represented by SEQ ID NO: 2 by deletion, substitution or addition of one or more amino acids, and possessing glutaminase activity. This protein is a novel glutaminase possessing excellent thermostability and the like.

Abstract: Provided are a protein comprising the amino acid sequence as shown in SEQ ID NO: 2 and having prolidase activities, a prolidase gene coding for the protein, a prolidase gene comprising the nucleotide sequence as shown in SEQ ID NO: 1, recombinant DNA having the gene inserted into vector DNA, and a transformant or transductant comprising the recombinant DNA, and a method for producing prolidase using the transformant or transductant.