مواقع هامة
http://www.biochemistry4all.com/
http://www.thanwya.com/vb/showthread.php?t=335549
http://www.star28.com/site/cat-100.html
http://www.websy.com/linker/Directory/Sciences/Chemistry/
http://ejabat.google.com/ejabat/thread?tid=484f4656bf180816
http://site.jsoftj.com/s1846.html