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.
English Channel. an arm of the Atlantic Ocean between S England and N France, linked with the North Sea by the Strait of Dover. Length: about 560 km (350 miles). Width: between 32 km (20 miles) and 161 km (100 miles)