Dissolved free amino acids in hydrothermal vent habitats of the Guaymas Basin

Details Dissolved free amino acids in hydrothermal vent habitats of the Guaymas Basin Dissolved free amino acids in hydrothermal vent habitats of the Guaymas Basin

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2937h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 11, pp.2937-2945

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6

Scientific paper

Total dissolved free amino acid (DFAA) concentrations and molecular compositions were determined in high-temperature smoker fluids (exit temperatures 152-319°C) and interstitial waters of a sediment-covered hydrothermal vent system located in the southern Guaymas Basin, Gulf of California. DFAAs were not detected ( 1 nM) in the hot vent fluids, a result which probably reflects the instability of these compounds when exposed to the extreme high temperatures and pressures characteristic of hydrothermal fluids. Ammonium is the principal end-product of this thermal catalytic diagenesis. Hydrothermal vent and non-vent control sediments had DFAA concentrations ranging from 5-445 and 10-28 M, respectively. The DFAA concentrations in both habitats were highest in the near-surface region (0-4 cm) and decreased at greater depths. The depth-dependent concentration gradients for hydrothermally impacted sediments were steeper than for the control samples and covaried with total microbial biomass. The molecular composition of the hydrothermally impacted samples included most common protein amino acids in addition to -aminoglutaric acid. Glutamate, glycine, serine, and alanine were major constituents of the DFAA pool.

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