nhờ các bạn lấy hộ mình bài này nhé:
A Rapid Formaldehyde Assay Using Purpald Reagent: Application under Periodation Conditions
M.S. Quesenberry, Y.C. Lee
Department of Biology, The McCollum–Pratt Institute, The Johns Hopkins University, Baltimore, Maryland, 21218
link: www.ncbi.nlm.nih.gov/pubmed/8742081
http://www.mediafire.com/view/?bnk6mghq45qcd1n