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Analytical ultracentrifuge (AUC) rotors are unique in that they must allow the passage of light through the spinning sample. The optical systems in the AUC (UV-Vis absorbance and Rayleigh interference) observe the solution behavior of molecules as they undergo sedimentation.
Analytical ultracentrifuge rotors are only for use in the Optima AUC or ProteomeLab XL-A/I.