[DIYbio] simple PCR methods

> http://www.biotechniques.com/news/The-ups-and-downs-of-convection-PCR/biotechniques-307800.html


They say, "As the sample entered the cool zone at the top of the tube, it underwent annealing and extension. Then, the DNA dropped
to the bottom of the tube and was heated again. "

I think they are saying DNA expands to the point of being suspended when hot,
and sinks when cooled, or are they just saying some toroidal flow patterns happen
in the size tube they used?

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