The amino acid composition of estuarine colloidal material |
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Authors: | AC Sigleo PE Hare GR Helz |
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Institution: | 1. Carnegie Institution of Washington, Geophysical Laboratory, Washington, D.C. 20008, U.S.A.;2. Chemistry Department, University of Maryland, College Park, MD 20782, U.S.A. |
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Abstract: | Amino acids were determined in estuarine colloidal and particulate material from near surface waters ranging from fresh to brackish water (12 g kg?1 salinity). The hydrolizable amino acids and associated ammonia account for an average of 80% of the nitrogen present in colloidal samples, and approximately 75% of the nitrogen from particulate fractions of the same samples. The relative proportions of these amino acids are similar to those of a cultured estuarine diatom. There are no significant amounts of D amino acids, or non-protein amino acids characteristic of bacteria in sediments and soil. A single deep-water sample (25 m) shows some evidence of bottom mud resuspension by the presence of a possible aspartic acid-hydroxyproline dimer. |
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Keywords: | amino acids estuaries dissolved organic compounds colloids extracellular products Chesapeake Bay |
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