Fig. 4.

Time course of the extension during load application transverse to the net cellulose orientation. The deformation, which occurs during the first 10 min of load application, is not shown. The graphs represent typical curves for the extension between 10 and 30 min under the different experimental conditions. Heat inactivation greatly decreases the extensibility. Addition of SkXTH1 to the inactivated transverse wall samples largely restores the extensibility at pH 4·5.