background: antimicrobial effi cacy of photodynamic therapy (pdt) depends on both the photosensitizer (ps) and laser parameters. in the present study, antimicrobial effectiveness of pdt with different concentrations of two pss was compared. materials and methods: in this study, we employed fi fty-nine 6-week-old male wistar rats. all except the negative and overall control groups were immunosup...

e-Poly-L-lysine (e-PL) consists of 25–35 L-lysine residues in isopeptide linkages and is one of only two amino acid homopolymers known in nature. Elucidating the biosynthetic mechanism of e-PL should open new avenues for creating novel classes of biopolymers. Here we report the purification of an e-PL synthetase (Pls; 130 kDa) and the cloning of its gene from an e-PL–producing strain of Strepto...