Abstract: Provided are: cellulose porous particles which have large surface areas on which cells can be attached, and on which cells can be adhered easily, and which rarely undergo the detachment of cells when the cells are cultured at a high density; and a microcarrier for culture use, which comprises the cellulose porous particles. The cellulose porous particles according to the present invention are composed of cellulose, in which the cellulose constituting the cellulose porous particles is modified by a cationic substituent and the cellulose constituting the celluose porous particles has a polypeptide bound thereto.

Abstract: A welding determination device includes: a measurement unit configured to measure temperature of a joint portion between strip-shaped sheets (for example, steel strips (2)) to be joined by seam welding; and a determination unit configured to, based on measurement results by the measurement unit, calculate an average temperature Tave of the joint portion and a temperature difference ?T that is a difference between a maximum value and a minimum value among temperature of the joint portion and, when the average temperature Tave is less than or equal to a first threshold value and the temperature difference ?T is more than or equal to a second threshold value, determine that a joining defect due to ineffective current has occurred at the joint portion.

Abstract: The purpose is to determine occurrence of expulsion in seam welding with high accuracy. A welding determination device includes: a measurement unit configured to measure temperature of a joint portion between strip-shaped sheets (for example, steel strips) to be joined by seam welding; and a determination unit configured to, based on a measurement result by the measurement unit, calculate an average temperature Tave and a temperature difference ?T of the joint portion and, when the average temperature Tave is more than or equal to a first threshold value that is set according to the sheet thickness of each of the strip-shaped sheets and the temperature difference ?T is more than or equal to a second threshold value, determine that expulsion has occurred at the joint portion.