A portion of the disclosure of this patent document contains material which is subject to copyright protection. In one embodiment, powder diffraction data is collected from samples of polycrystalline macromolecule and macromolecule-ligand complex and the refined structure of the macromolecule is used as an approximate model for a combined Rietveld and stereochemical restraint refinement of the macromolecule-ligand complex. The memory controller is coupled to the chain and configured to output a memory access command that is received by each of the memory devices in the chain and that selects a set of two or more of the memory devices to be accessed. Upon precipitation of the contaminants from the lipid composition, a separation is conducted to remove the precipitated material from the lipid composition. The frame members are mounted on the cabinet either for pivotal movement from adjacent the bottom of the open front end of the cabinet, or for horizontal, rectilinear movement adjacent the top of the open front side of the cabinet.