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Warren DeLano wrote:
which anyhow usually come with blue and red flipped w.r.t. common sense...
Amen to that!
??? If you make a spacefilling model instead of a surface, and color the atoms with CPK colors or O colors, acidic patches have a lot of oxygens and show up red, basic patches have a lot of N atoms and show up rich in blue. At neutral pH the acidic patches will be more negative, and the basic patches more positive. I can see red being intuitively warmer and blue cooler, but my common sense doesn't tell me whether red is more electrically positive or negative, so I rely on the above mnemonic. Please don't start switching the assignment around! (OK come to think of it the positive terminal on car batteries is usually red, at least for modern cars with negative ground where positive is the "hot" terminal, so perhaps there is a precedent for the opposite convention.) Happy New Year, Ed
