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Protein Protocols Protein Protocols

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72 Walker<br />

Fig. 2. Diagrammatic representation of a method for producing a gradient using a two-channel<br />

peristaltic pump. Reservoir B has the high percentage acrylamide concentration, reservoir<br />

A the lower.<br />

4. We have described the production of a linear gradient using a purpose built gradient<br />

mixer. However, it is not necessary to purchase this since the simple arrangement, shown<br />

in Fig. 2 usin1g just flasks or beakers, a stirrer, and a dual channel peristaltic pump, can<br />

just as easily be used.<br />

Reference<br />

1. Margolis, J. and Kenrick, K. G. (1967) Nature (London), 214, 1334.

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