One of these experiments, the Protein Crystallization Apparatus for Microgravity, holds more than six times as many samples as are normally accommodated in the same amount of space. These crystals are being grown using the vapor diffusion method. In vapor diffusion, liquid evaporates from a protein solution and is absorbed by a reservoir solution in a wicking material. As the protein concentration rises, the proteins form crystals. These experiments are a precursor to long-duration crystallization investigations aboard the International Space Station, which would greatly benefit from the ability to control crystal growth times of up to approximately six months in length.
Proteins play important roles in daily life, from providing nourishment to fighting disease.
When the blue shift comes on duty, Mission Specialist Catherine Coleman and Payload Specialist Fred Leslie will devote the majority of their time to Drop Physics Module and Glovebox experiments.