Abstract: To provide a method for producing a fluorinated copolymer, whereby it is possible to efficiently produce a fluorinated copolymer in which coloration and foaming are suppressed during heating. A method for producing a fluorinated copolymer, comprising a step of producing a fluorinated copolymer by polymerizing tetrafluoroethylene and other monomer other than the tetrafluoroethylene in the presence of a hydroperoxide, at least one selected from the group consisting of a sulfite, a hydrogen sulfite, a dithionite, and a metabisulfite, at least one selected from the group consisting of an acidic substance and a substance that generates an acid by hydrolysis, and an aqueous medium.

Abstract: The present invention provides a nerve cell device in which early observation of nerve activity (spikes, bursts, and the like) is made possible and the measured electric strength is increased by cultivating neurons upon a cell scaffold. By using this nerve cell device, imaging of intracellular signaling is also possible.

Abstract: [Problem] To provide a fiber sheet that can be used as a cell scaffold material and provide a stable and uniform cell sheet. [Solution] The present invention provides an oriented fiber sheet. The diameter, in an orthogonal cross-section, of a fiber forming the fiber sheet is 1 ?m to 7 ?m. The pitch of the fiber sheet is 6 ?m to 60 ?m, the porosity is 10% to 60%, and the thickness is 4 ?m to 70 ?m. When a plurality of layers of the fiber sheet are stacked upon one another, the orientation axes of the fiber sheets intersect at angles of 5° to 25°. The fiber forming the fiber sheet are prepared from a biodegradable or non-biodegradable polymer material. PLGA is preferable as a biodegradable polymer material. Polystyrene is preferable as a non-biodegradable polymer material.

Abstract: The present invention provides a nerve cell device in which early observation of nerve activity (spikes, bursts, and the like) is made possible and the measured electric strength is increased by cultivating neurons upon a cell scaffold. By using this nerve cell device, imaging of intracellular signaling is also possible.

Abstract: Problems: A devise for retaining and transporting cells that is capable of holding cultured cells and moving the cells while holding them is provided. Solutions: The device for retaining and transporting cells 100 has a base 101, a through hole 103, a cell scaffold 105, and an manipulating part 107. The cell scaffold 105 holds cells such as cardiac myocytes and nerve cells. When holding the cells in the cell scaffold 105, drop the suspension from the through hole 103 to the cell scaffold 105 exposing from the through hole 103 using a pipette etc. and culture. The manipulating part 107 is formed so as to project from the upper surface P101a of the base 101. Multiple manipulating part 107 is formed radially on the upper surface P101a of the base 101, centered on the through hole 103. By forming the manipulating part 107, the manipulating part 107 can be held by a holder such as tweezers, which enables easy operation of the device for retaining and transporting cells 100.