Abstract: The present invention aims to provide a composition for promoting immune cell metabolism, a composition for activating immunity, a method of promoting immune cell metabolism, and a method of activating immunity. The present invention relates to a composition for promoting immune cell metabolism, which contains L-ergothioneine or a salt thereof as an active ingredient.

Abstract: The present invention aims to provide a composition for sleep improvement, which contains a highly safe substance as an active ingredient, and a method of improving sleep. The present invention relates to, for example, a composition for sleep improvement, which contains L-ergothioneine or a salt thereof as an active ingredient.

Abstract: Generation of cavitation jet in air on a surface of a work roll provides a higher cleaning force than squirting of only high pressure fluid, so that sticking substances on the surface of the work roll are reliably removable. When a distance between a cleaning nozzle and the surface of the work roll and pressure of the high pressure fluid are controlled within a predetermined range, sticking substances are efficiently removable while roughness of the surface of the work roll is maintained.

Abstract: Generation of cavitation jet in air on a surface of a work roll provides a higher cleaning force than squirting of only high pressure fluid, so that sticking substances on the surface of the work roll are reliably removable. When a distance between a cleaning nozzle and the surface of the work roll and pressure of the high pressure fluid are controlled within a predetermined range, sticking substances are efficiently removable while roughness of the surface of the work roll is maintained.

Abstract: Production of hot dipped hot rolled steel strip by producing steel strip by casting by a thin slab continuous casting process and hot rolling, said steel strip containing, by mass %, C: 0.03% or more, Si: 0.02% or more, Mn: 0.15% or more, and Ca: 0.001% or more by heating it to a peak maximum steel strip temperature of 550° C. to less than 650° C. by a temperature elevation rate of 25° C./sec or more for 15 sec or more for oxidation, heating it to a peak maximum steel strip temperature of 700° C. to 760° C. so that the time when the steel strip temperature is 570° C. or more is 25 sec to 45 sec for reduction, then hot dipping it.