anitbiotics = http://www.ultranet.com/~jkimball/BiologyPages/A/Antibiotics.html
antibiotics overview = http://www.serva.de/products/knowledge/021011.shtml
Metabolic Analysis in Drug Discovery = http://bip.cnrs-mrs.fr/bip10/sc2000.htm
polymixin B = http://www.pharmacology2000.com/Chemotherapy/Antibacterial/polymixins1.htm#Polymixin%20B