THOUGH little is actually known about the shape of humus molecules, and only a few experiments have been described 1,2 on the fractionation of humus on ‘Sephadex’ gel (Pharmacia, Uppsala, Sweden), ...
Exclusion chromatography can be used to separate molecules on the basis of size 1,2. The technique described here, which uses gel filtration to separate high-molecular-weight DNA from smaller ...
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