title: Determination of molecular weights in the ultracentrifuge using time-lapse photography.
mesh_terms: D002919:Chymotrypsinogen; D004798:Enzymes / Q000032:analysis*; D005069:Evaluation Studies as Topic; D008433:Mathematics; D008722:Methods; D008970:Molecular Weight; D010781:Photography; D012260:Ribonucleases / Q000032:analysis; D013997:Time Factors; D014461:Ultracentrifugation
chemical_list: D004798:Enzymes; D002919:Chymotrypsinogen; D012260:Ribonucleases