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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.
Quick Answer. An ion scanner is also known as an ion mobility spectrometry device and is used for security reasons to scan for particulates and determine their substance of origin. It is used to detect illicit substances and is an effective tool in combating the drug trade and other threats.