1.97.1.12 a group of short amphiphilic peptides improve the thermal stability of the multi-domain protein complex photosystem-I in aqueous solution. Ac-I5K2-CONH2 shows the best stabilizing effect by enhancing the melting temperature of PS-I from 48°C to 53°C at concentration of 0.65 mM and extending the half life of isolated PS-I significantly 713357 1.97.1.12 acetyl-VVVVVVD stabilizes the photosystem I complex to a lesser extent than acetyl-AAAAAAK 713337 1.97.1.12 dodecyl-beta-D-maltoside partially stabilizes 713337 1.97.1.12 in the presence of acetyl-AAAAAAK, the PS-I complex is stable in a dried form at room temperature for at least 3 weeks 713337 1.97.1.12 octyl-beta-D-glucoside partially stabilizes 713337