Figure 2. Thermal stability of PS-I measured by following CD intensity at 689 nm versus temperature in the presence of different surfactants (0.5% (w/v)).

The sample with 0.8 mM nonionic Triton X-100 (to solubilize PS-I) acted as a control. All the data were taken after protein solutions were incubated for 5 min. Curves were fitted with equation 1.