Major shift in bacterioplankton utilization of enantiomeric amino acids between surface waters and the ocean's interior

By M. Perez, C. Pausz, G. Herndl. 2003

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Microbial oceanography of the dark ocean's pelagic realm (2009, background): “Whereas L-amino acids dominate the ambient amino acid pool and are commonly released by phytoplankton and through grazing, D-amino acid production in the marine environment is largely restricted to the peptidoglycan layer of bacteria (Pérez et al. 2003; Kawasaki and Benner 2006).”
Distribution and activity of Bacteria and Archaea in the deep water masses of the North Atlantic (2006, methodology): “…Asp was used for bulk D- and L-Asp uptake measurements since the concentration of dissolved free Asp in the North Atlantic Deep Water is ,5 nmol L21, and Pérez et al. (2003) showed that uptake rates increase from 0.1 nmol L21 to 10 nmol L21 final concentration of added Asp by a factor of ,10.”
Bacterial release of dissolved organic matter during cell growth and decline: Molecular origin and composition (2006, background): “Perez et al. (2003) reported that the presence of grazers increased the gross release of D-Asp and stimulated the uptake by heterotrophic bacteria.”