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An assessment of the microbial contribution to aquatic dissolved organic nitrogen using amino acid enantiomeric ratios
Organic Geochemistry, Volume 36, Issue 7, July 2005, Pages 1099-1107
Vera Jones, Matthew J. Collins, Kirsty E.H. Penkman, Rudolf Jaffé, George A. Wolff
http://www.sciencedirect.com/science...9b9ddd84b099ed