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.
Argon/Krypton Ion Laser Safety. 1  The laser itself emits at 10s to 100s of mW or more in a collimated beam instantly damaging to vision. 2  The power supply is very often line-connected and operates at around 100 V with many AMPs of current available for the laser tube or for a nice path through you unsuspecting body.