Figure 8

Mean pH values after 1 h perfusion (front row) and at the end of the experiment (back row). Group 1: green; pH after 1 hour was 7.6, changing to 6.9 up to the end, group 2: blue; pH after 1 h was 7.54, changing to 7.0 up to the end, group 3: red; pH was 7.6 after 1 hour and it remained constant at 7.4 up to the end.