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 best size for a YouTube channel icon is 800 x 800 pixels, which you can whip up in PicMonkey using custom sizing in our Design tool. (For pixel geeks, your profile pic will render at 98 x 98 pixels.) On a desktop, your channel icon will appear as a square in the upper left-hand corner of your banner.