Polymyxin B nonapeptide, a cationic cyclic peptide derived by enzymatic processing from the naturally occurring peptide polymyxin B, is able to increase the permeability of the outer membrane of Gram-negative bacteria toward hydrophobic antibiotics probab
12-Crown-4 disrupts Aβ40 fibrils. 12-Crown-4 can enter into the hydrophobic core region and form competitive, hydrophobic interactions with key hydrophobic residues.