[Polleke]

Hallo,

I have been in a discussion on whether a clean DNA pellet should be visible or invisible.
We are pretty sure that a clean DNA pellet (just DNA) should be invisible, but what makes a DNA pellet visible then? Contamination like salts etc? But why does this make the DNA pellet visible then and the DNA on itself not?
       
 
thanks

[Arkcon]

DNA, in bulk, is a white, fluffy pellet, or maybe a gelatinous clump of stands, if you can keep it long.  Its visible in bulk for the same reason many white things are -- because its not in solution.  Solutions, or colloids for long macromolecules can be clear, simply because the solid component is dispersed in the liquid.  Hard for me, to explain it better than that.