Fig. 9. The effect of pH on the load curve for WECB from B. canaliculatum. The specimen was allowed to equilibrate in 0.2 mol l^-1 citrate/phosphate buffer for 30 min prior to mechanical testing. The pH=2 treatment was the only treatment that appeared to cause a change in the average yield stress and Hookean behavior of the specimen. Pictured are the curves from the tenth cycle of loading.