AUC is a robust and widely accepted analytical method to characterize the molecular mass, size, shape and association of molecules in solution. It has been used extensively by biochemists and molecular biologists to define properties of biological macro-molecules and has also found applications within the polymer science community. Experiments are performed using specialized centrifuge cells in an analytical ultracentrifuge capable of measuring radial concentration gradients using absorption or refrac-tometric optics. In sedimentation velocity experiments a moving boundary forms upon application of a high centrifugal force. The rate of movement of the boundary is determined by the sedimentation coefficient and the broadening of the boundary with time occurs because of diffusion. The sedimentation coefficient is a function of a molecule's mass and frictional properties whereas the diffusion constant in only determined by the frictional properties. Sedimentation equilibrium measurements are performed at lower rotation velocities where the sedimentation force is balanced by diffusion. The shape of the concentration gradient is determined by the molecular weight of the species present in the sample. A variety of computer data analysis methods have been developed for both sedimentation velocity and equilibrium data.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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