adjusting the rotor speed of the experiment size-ranges from 100 Da to 10 GDa can be covered. Sedimentation velocity experiments can also be used to study reversible chemical equilibria between macromolecular species, by either monitoring the number and molar mass of macromolecular complexes, by gaining information about the complex composition from multi-signal analysis exploiting differences in each components spectroscopic signal, or by following the composition dependence of the sedimentation rates of the macromolecular system, as described in Gilbert-Jenkins theory. The experiment aims to monitor the sedimentation behavior at a fixed angular speed. Sedimentation equilibrium Sedimentation equilibrium experiments reports the molar mass of analytes and their chemical equilibrium constants. The rotor speed is adjusted such that a steady-state concentration profile c(r) of the sample in the cell is formed, where sedimentation and diffusion cancel out each other. Density gradient centrifugation Data evaluation See also Ultracentrifuge Gas centrifuge Theodor Svedberg Differential centrifugation Buoyant density ultracentrifugation Zippe-type centrifuge References External links Reversible Associations in Structural and Molecular Biology (RASMB -an Analytical Ultracentrifugation Forum) Analytical Ultracentrifugation as a Contemporary Biomolecular Research Tool. Gilbert-Jenkins theory Report on an ultracentrifuge explosion. Further reading Centrifuges Analytical chemistry Laboratory techniques Biophysics Fluid dynamics