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The sedimentary core samples (25-30cm in length) were collected from two sites (SC-8 : 5\u00b0N, 156\u00b0E, 3604m deep ; SC-9 : 0\u00b0, 158\u00b0E, 2226m deep) in the Equatorial Central Pacific by a box core sampler. The core samples were sliced into thin layer of the sediment with 1cm thick, from which foraminiferal tests were separated by using of the sieve with 60 mesh. The tests were analyzed for amino acid composition, D- and L- amino acid ratio and ^\u003c14\u003eC/^\u003c13\u003eC ratio. Following results were obtained. 1) D/L ratio of aspartic acid and ^\u003c14\u003eC age tended to increase as increase in the depth from the top of the core samples, suggesting that D/L ratio of aspartic acid can be applied for the determination of age of the sediment samples. 2) Thus, racemization rate constant (k_\u003cASP\u003e) of aspartic acid was calculated for these two core samples. 0.66x10^\u003c-5\u003e yr^\u003c-1\u003e and 1.01x10^\u003c-5\u003e yr^\u003c-1\u003e were obtained for k_\u003cASP\u003e of SC-8 and SC-9 respectively. 3) Such difference in k_\u003cASP\u003e between these two core samples are discussed from the points of the ambient water temperature and bioturbation.", "subitem_description_type": "Abstract"}]}, "item_9_identifier_registration": {"attribute_name": "ID\u767b\u9332", "attribute_value_mlt": [{"subitem_identifier_reg_text": "10.18999/sumrua.2.52", "subitem_identifier_reg_type": "JaLC"}]}, "item_9_publisher_32": {"attribute_name": "\u51fa\u7248\u8005", 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