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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.
The majority of x-ray tubes found in current cardiac cath labs contain only two. focal spots. The small spot will have a nominal size of 0.5 to 0.6 mm with a kW. rating for a single exposure of 40 to 50 kW. The large focal spot will be 0.9 to 1.2. mm in size with a kW rating of 80 to 110 kW.