title: Biological macromolecules in solvents of variable density: characterization by sedimentation equilibrium, densimetry, and X-ray forward scattering and an application to the 50S ribosomal subunit from Escherichia coli.
mesh_terms: D001704:Biopolymers; D002501:Centrifugation, Zonal; D004926:Escherichia coli / Q000648:ultrastructure*; D008433:Mathematics; D008970:Molecular Weight; D012270:Ribosomes / Q000648:ultrastructure*; D012997:Solvents; D013816:Thermodynamics; D014961:X-Ray Diffraction
chemical_list: D001704:Biopolymers; D012997:Solvents