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首页> 外文期刊>Geochemical Journal >Distribution of amino acid and its stereochemistry related with biological activities in Rikubetsu, Hokkaido, Japan
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Distribution of amino acid and its stereochemistry related with biological activities in Rikubetsu, Hokkaido, Japan

机译：日本北海道六别市的氨基酸分布及其与生物活性有关的立体化学

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摘要

Core samples of sediments at depths of 0-300 cm at Rikubetsu, Hokkaido, Japan were analyzed for total organic carbon (TOC) concentration, total hydrolyzed amino acids (THAA) and density of viable microorganisms. TOC, THAA and density of viable microorganisms were greatest at the surface and decreased with the depth: THAA showed 62 mumol/g at a depth of 0-5 cm. The correlation coefficients (r) for TOC and THAA versus cell density were 0.97 and 0.98, respectively. The alteration of dicarboxylic amino acids, aspartic acid and glutamic acid, to beta-alanine and gamma-aminobutyric acid respectively, via specific decarboxylation due to diagenesis were observed. Rate constant of aspartic acid racemization, k(ASP) was determined to be 3.8 x 10(-5) at 4,420 yrBP and 2.6 x 10(-5) at 9,290 yrBP. Some anomalies in vertical distribution of THAA and cell density in the core sediment may indicate the presence of the past warmer period called "Hypsithermal" in Rikubetsu, Hokkaido, Japan.
机译：分析了日本北海道六平市0-300 cm深度沉积物的核心样品的总有机碳（TOC）浓度，总水解氨基酸（THAA）和活微生物的密度。 TOC，THAA和存活微生物的密度在表面最大，并随深度降低：THAA在0-5 cm的深度显示为62μmol/ g。 TOC和THAA与细胞密度的相关系数（r）分别为0.97和0.98。观察到由于成岩作用，通过特定的脱羧作用，二羧酸氨基酸，天冬氨酸和谷氨酸分别变为β-丙氨酸和γ-氨基丁酸。天门冬氨酸消旋的速率常数k（ASP）在4,420 yrBP时为3.8 x 10（-5），在9,290 yrBP时为2.6 x 10（-5）。 THAA的垂直分布和核心沉积物中细胞密度的一些异常可能表明在日本北海道六别市，存在着一个较暖的时期，称为“ Hypsithermal”。

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