Crystallization of the collagen-like polypeptide (PPG)10 aboard the International Space Station. 3. Analysis of residual acceleration-induced motion.

The crystn. of the collagen-like polypeptide, (Pro-Pro-Gly)10 [(PPG)10], onboard the International Space Station (ISS) in microgravity using the Advanced Protein Crystn. Facility showed parallel and coherent crystal motions. The residual acceleration profiles and the history of the ISS Increment 3 mission allowed a quant. interpretation of these motions. Two events detd. the obsd. crystal motions: the undocking of the Space Shuttle and a change in the ISS attitude required for power generation. No correlation between these motions and crystal quality was apparent.