CCD video observation of microgravity crystallization: apocrustacyanin C1

Abstract Apocrustacyanin C 1 has been crystallized in the vapour-diffusion apparatus of ESA's Advanced Protein Crystallization Facility (APCF) on-board the NASA space shuttle STS-65 International Microgravity Laboratory-2 (IML-2) mission. Crystal growth was monitored by black and white CCD observation at time intervals throughout the experiment. The resulting crystals displayed a motion within the hanging drop that is attributed to Marangoni convection effects. The images also show a “halo” effect around the growing crystals which can be attributed to the presence of depletion zones i.e. solution regions which are depleted of this coloured protein.