Abstract: The present invention relates to the use of a combination comprising gamma-linolenic acid and at least one green tea polyphenol, in which the ratio of the gamma-linolenic acid to the green tea polyphenol ranges from approximately 1 to approximately 10, for increasing the in vitro and ex vivo differentiation of keratinocytes.

Abstract: The invention relates to a method for controlling microbiological process in a liquid microbial population-containing medium consisting in on-line measuring at least one state variable related to the microbiological process and in utilising at each instant (t) values measured for at least one state variable by calculating therefrom the first, second and third temporal derivatives after smoothing values over a time period adjustable by a causal mathematical filter after each measurement and each temporal derivative calculation. One or several calculated and smoothed values of the state variable are compared at each instant (t) with at least one predefined criterion in order to identify the microbiological process phases and to determine the necessity for producing an action thereon.