Forskning ved Københavns Universitet - Københavns Universitet

Forside

An assessment of the microbial contribution to aquatic dissolved organic nitrogen using amino acid enantiomeric ratios

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

There is increasing evidence that certain microbially-derived compounds may account for part of the aquatic dissolved organic nitrogen (DON) pool. Enantiomeric ratios of amino acids were used to assess the microbial input to the DON pool in the Florida Everglades, USA. Elevated levels of d-alanine, d-aspartic acid, d-glutamic acid and d-serine indicated the presence of peptidoglycan in the samples. The estimated peptidoglycan contribution to amino acid nitrogen ranged from 2.8 ± 0.1% to 6.4 ± 0.9%, increasing with salinity from freshwater to coastal waters. The distribution of individual d-amino acids in the samples suggests additional inputs to DON, possibly from archaea or from abiotic racemization of l-amino acids.

OriginalsprogEngelsk
TidsskriftOrganic Geochemistry
Vol/bind36
Udgave nummer7
Sider (fra-til)1099-1107
Antal sider9
ISSN0146-6380
DOI
StatusUdgivet - 2005
Eksternt udgivetJa

ID: 232088554