Fig. 3. Change in CPD concentration in Sterechinus neumayeri plutei at 0°C. The exponential decay model [Y=(A₀-c)e^-kt+c] is fitted to the data, from which the rate constant (k) was calculated. The inset is the standard curve of OD₄₀₅ versus UV dose [calf thymus DNA exposed to known UV-C doses (0, 2.5, 7.5, 10 and 15 J m^-2 at 254 nm wavelength)].