Biology:Flow birefringence
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In biochemistry, flow birefringence[1] is a hydrodynamic technique for measuring the rotational diffusion constants (or, equivalently, the rotational drag coefficients). The birefringence of a solution sandwiched between two concentric cylinders is measured as a function of the difference in rotational speed between the inner and outer cylinders. The flow tends to orient an ellipsoidal particle (typically, a protein, virus, etc.) in one direction, whereas rotational diffusion (tumbling) causes the molecule to become disoriented. The equilibrium between these two processes as a function of the flow provides a measure of the axial ratio of the ellipsoidal particle.
See also
References
- ↑ Cerf, Roger.; Scheraga, Harold A. (1 October 1952). "Flow Birefringence in Solutions of Macromolecules.". pp. 185–261. doi:10.1021/cr60159a001. https://pubs.acs.org/doi/10.1021/cr60159a001.
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