Fig. 6. Oxidative stress markers in Z. viviparus liver samples after 2 h of exposure to 18°C as well as after 2, 8 or 12 h of recovery (recov.). (A) Tert-butyl hydroperoxide (tBOOH)-initiated chemiluminescence, indicating imbalance between pro- and antioxidant processes. (B) Carbonyl content, indicating protein oxidation. Values are means ± s.d., N=3-5; ^*significantly different from the unstressed group, P<0.05.