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Amino acid abundances and stereochemistry in hydrothermally altered sediments from the Juan de Fuca Ridge, northeastern Pacific Ocean
Applied Geochemistry ( IF 3.1 ) Pub Date : 2000-09-01 , DOI: 10.1016/s0883-2927(99)00110-9
E Andersson 1 , B R Simoneit , N G Holm
Affiliation  

The Juan de Fuca Ridge is a hydrothermally active, sediment covered, spreading ridge situated a few hundred kilometres off the west coast of North America in the northeastern Pacific Ocean. Sediments from seven sites drilled during the Ocean Drilling Program (ODP) Legs 139 and 168 were analyzed for total hydrolyzable amino acids (THAA), individual amino acid distributions, total organic C (TOC) and total N (TN) contents. The aim was to evaluate the effects of hydrothermal stress on the decomposition and transformation of sedimentary amino acids. Hydrolyzable amino acids account for up to 3.3% of the total organic C content and up to 12% of the total N content of the upper sediments. The total amounts of amino acids decrease significantly with depth in all drilled holes. This trend is particularly pronounced in holes with a thermal gradient of around 0.6 degrees C/m or higher. The most abundant amino acids in shallow sediments are glycine, alanine, lysine, glutamic acid, valine and histidine. The changes in amino acid distributions in low temperature holes are characterized by increased relative abundances of non-protein beta-alanine and gamma-aminobutyric acid. In high temperature holes the amino acid compositions are characterized by high abundances of glycine, alanine, serine, ornithine and histidine at depth. D/L ratios of samples with amino acid distributions similar to those found in acid hydrolysates of kerogen, indicate that racemization rates of amino acids bound by condensation reactions may be diminished.

中文翻译:

东北太平洋胡安德富卡海岭热液蚀变沉积物中的氨基酸丰度和立体化学

胡安德富卡海脊是一个热液活跃、沉积物覆盖、扩张的海脊,位于太平洋东北部北美西海岸数百公里处。分析了大洋钻探计划 (ODP) 第 139 和 168 航段期间钻探的七个地点的沉积物的总可水解氨基酸 (THAA)、单个氨基酸分布、总有机碳 (TOC) 和总氮 (TN) 含量。目的是评估热液胁迫对沉积氨基酸分解和转化的影响。可水解氨基酸占上层沉积物总有机碳含量的3.3%,占总氮含量的12%。在所有钻孔中,氨基酸的总量随着深度的增加而显着降低。这种趋势在热梯度约为 0.6 摄氏度/米或更高的孔中尤为明显。浅层沉积物中含量最丰富的氨基酸是甘氨酸、丙氨酸、赖氨酸、谷氨酸、缬氨酸和组氨酸。低温洞中氨基酸分布的变化以非蛋白质β-丙氨酸和γ-氨基丁酸的相对丰度增加为特征。在高温孔中,氨基酸组成的特点是在深处含有高丰度的甘氨酸、丙氨酸、丝氨酸、鸟氨酸和组氨酸。氨基酸分布与干酪根酸水解产物相似的样品的 D/L 比表明,缩合反应结合的氨基酸的外消旋化率可能会降低。丙氨酸、赖氨酸、谷氨酸、缬氨酸和组氨酸。低温洞中氨基酸分布的变化以非蛋白质β-丙氨酸和γ-氨基丁酸的相对丰度增加为特征。在高温孔中,氨基酸组成的特点是在深处含有高丰度的甘氨酸、丙氨酸、丝氨酸、鸟氨酸和组氨酸。氨基酸分布与干酪根酸水解产物相似的样品的 D/L 比表明,缩合反应结合的氨基酸的外消旋化率可能会降低。丙氨酸、赖氨酸、谷氨酸、缬氨酸和组氨酸。低温洞中氨基酸分布的变化以非蛋白质β-丙氨酸和γ-氨基丁酸的相对丰度增加为特征。在高温孔中,氨基酸组成的特点是在深处含有高丰度的甘氨酸、丙氨酸、丝氨酸、鸟氨酸和组氨酸。氨基酸分布与干酪根酸水解产物相似的样品的 D/L 比表明,缩合反应结合的氨基酸的外消旋化率可能会降低。在高温孔中,氨基酸组成的特点是在深处含有高丰度的甘氨酸、丙氨酸、丝氨酸、鸟氨酸和组氨酸。氨基酸分布与干酪根酸水解产物相似的样品的 D/L 比表明,缩合反应结合的氨基酸的外消旋化率可能会降低。在高温孔中,氨基酸组成的特点是在深处含有高丰度的甘氨酸、丙氨酸、丝氨酸、鸟氨酸和组氨酸。氨基酸分布与干酪根酸水解产物相似的样品的 D/L 比表明,缩合反应结合的氨基酸的外消旋化率可能会降低。
更新日期:2000-09-01
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