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.
The English Channel (French: La Manche, the sleeve) is the part of the Atlantic Ocean that separates the island of Great Britain from northern France, and joins the North Sea to the Atlantic Ocean. It is about 563 km (350 mi) long and at its widest is 240 km (150 mi).