1 Stock number stamps contain movable bands with the numbers 0 - 9. 2  Choose between a sturdy metal core frame or sleek, economical plastic frame number stamp.
The channel has a large diameter of 0.8x1.1nm, and is non-selective for small ions. However, it has an upper exclusion size limit corresponding to molecular weights of about 600 Dalton of permeants. Because most metabolites have molecular weights lower than 600 Da and have been shown to pass through porin channels, porins are called general diffusion pores.
Silver ions A silver ion is a single atom of silver that is missing one electron from its outer orbit. The diameter of a silver ion is 0.230 nm, which is slightly smaller than an atom owing to one less electron. Ag has the electron configuration [Kr]4d 10 5s 1.