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. Author manuscript; available in PMC: 2012 Oct 24.
Published in final edited form as: Methods. 2011 Jan 27;54(1):136–144. doi: 10.1016/j.ymeth.2011.01.009

Figure 1.

Figure 1

Sedimentation equilibrium of a polydisperse polymer system: Rayleigh interference fringes for a bronchial mucus glycoprotein (BM-GRE, Mw ~ 6.0×106 g/mol). A loading concentration of ~0.2 mg/ml in a Beckman Model E analytical ultracentrifuge (rotor speed 1967rpm) and a cell of 30mm optical path length was used. The direction of sedimentation is from left to right. Note the very steep rising fringes at the cell base and yet there is still a finite curvature at the air-solution meniscus [10].