Faculty Profiles - MINAMI, Masayo

Papers - MINAMI, Masayo

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High precision C-14 measurements with the HVEE Tandetron AMS system at Nagoya University

T Nakamura, E Niu, H Oda, A Ikeda, M Minami, T Ohta, T Oda

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS Vol. 223 ( SPEC. ISS. ) page： 124 - 129 2004.8

Language：Japanese Publisher：ELSEVIER SCIENCE BV

In 1996/1997, a C-14-AMS system (model 4130-AMS) manufactured by High Voltage Engineering Europe (HVEE), B.V., The Netherlands, was installed at the Center for Chronological Research (CCR), Nagoya University. The system provides highly precise and accurate C-14 determinations as well as delta(13)C values for graphite targets (1.5 mg carbon and 3 mg iron powder) prepared from standards and samples. One sigma errors in C-14 ages typically range from +/-20 to +/-40 yr for materials younger than 8000 BP, depending on absolute C-14 ages or C-14 counting uncertainties. Standard deviations of C-13/C-12 ratios range from +/-0.1parts per thousand to +/-0.9parts per thousand. For relatively young samples, accuracies of less than 10parts per thousand are obtained using IAEA reference materials and FIRI test samples. Background levels on the C-14-AMS system range from 52 to 54 ka BP for a pure graphite powder. The HVEE C-14-AMS system at the CCR has been used routinely to date samples with a variety of research applications. (C) 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nimb.2004.04.027

Web of Science

Scopus

Chemical techniques to extract organic fractions from fossil bones for accurate ¹⁴C dating, Reviewed

Minami, M., Muto, H. and Nakamura, T.

Nucl. Instr. and Meth. in Phys. Res. Vol. B223-224 page： 302-307 2004

Studies on elemental distribution and circulation in view of multielement analysis of Eastern part of Aichi Prefecture.

南雅代, 山本鋼志, 三村耕一

Heisei 15 th Report of Atomic Energy Usage no.43 page： 51 - 56 2004

Isotope diluted neutron activation analysis (ID-NAA) for quantitative analysis of PGEs and Re

Tanaka T, Senda R, Shibata S, Minami M, Tanimizu M

GEOCHIMICA ET COSMOCHIMICA ACTA Vol. 66 ( 15A ) page： A763 - A763 2002.8

Diurnal variation of CO2 concentration, Δ¹⁴C and δ¹³C in an urban forest --Estimate of the anthropogenic and biogenic CO₂ contributions--. Reviewed

Takahashi, H., Konohira, E., Hiyama, T., Minami, M., Nakamura, T. and Yoshida, N.

Tellus Vol. 54B page： 97-109 2002

An extraction system to measure carbon-14 terrestial ages of meteorites with a Tandetron AMS at Nagoya University Reviewed

Minami, M. and Nakamura, T.

Radiocarbon Vol. 43 ( 2A ) page： 263-270 2001

Studies on elemental distribution and cycles in geosphere using multisample and multielements analyses.

南雅代

Heisei 12th Report of Atomic energy usage no.40 page： 118 - 136 2001

Geochemical mapping as a fruitful field training for geosciences

山本鋼志, 三村耕一, 南雅代

Chisitsu News vol.558 page： 41 - 47 2001

Neutron activation analysis using an automated γ-ray detection system at Radioisotope Center, Nagoya University.

南雅代

Annual Report of Nagoya University Museum vol.17 page： 15 - 32 2001

XAD-2樹脂処理法による化石骨のAMS¹⁴C年代 Reviewed

南　雅代・中村俊夫

第四紀研究 Vol. 39 page： 547-557 2000

AMS radiocarbon age for fossil bone by XAD-2 chromatography method

Minami M., Nakamura T.

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms Vol. 172 ( 1-4 ) page： 462 - 468 2000

Language：Japanese Publisher：Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

The XAD-2 chromatography method was examined for its ability to efficiently eliminate exogenous organic matter from fossil bones and to improve the accuracy of radiocarbon (14C) dating and stable isotope determinations on bone proteins. The fossil bones used in the experiment were animal fossil bones collected from the Awazu submarine archaeological site, Shiga, Japan. For comparison, the gelatin-extraction method was also applied to the same samples. It was found that the gelatin-extraction method is sufficient for 14C dating on well-preserved bones, but insufficient on poorly preserved bones, containing less than 1% extractable gelatin. The XAD-2 resin is useful for the clean up of proteins especially from poorly preserved bones. The carbon stable isotope fractionation of around 1‰ by XAD-2 treatment on modern collagen standards was larger than reported previously. The isotopic variation by sequential extraction of bones probably originates from changes in the amino acid composition and seems to be less sensitive to the indication of the removal of organic contamination. © 2000 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0168-583X(00)00397-9

Scopus

Deriving AMS Radiocarbon Age of Fossil Bone by Pretreatment with XAD-2 Resin. Comparison with the Gelatin Extraction Method.

Minami Masayo, Nakamura Toshio

The Quaternary Research (Daiyonki-Kenkyu) Vol. 39 ( 6 ) page： 547 - 557 2000

Language：Japanese Publisher：Japan Association for Quaternary Research

Accurate radiocarbon (14C) and carbon isotope measurements of fossil bones require complete removal of all exogenous carbon. XAD-2 chromatography was used to eliminate the foreign organic matter from bones. The fossil bones used in the experiment were animal bone fragments collected at the Awazu submarine archeological site. The bone samples were demineralized with 0.8M HCl at 4°C, and the acid-insoluble residue was concentrated by centrifugation and lyophilized. The demineralized bone powder was hydrolysed with 6M HCl at 110°C. Solid components were removed by centrifugation before the filtered hydrolysate was passed through the XAD-2 resin used for removal of fulvic acids. In addition, the gelatin extraction method of decalcification in a cellulose tube with 1.2M HCl, followed by heating at 90°C in water was used for the same species to compare the ability of the two methods to remove organic contaminants. The purified hydrolysates obtained from XAD-2 chromatography have more positive δ13C values and older 14C ages than gelatin collagens extracted from hot water. The difference tends to become greater for poorly preserved fossil bones containing less than 0.7% collageneous materials. The fulvic phases give apparently younger ages and significantly more negative δ13C values than bone organic carbon. Furthermore, the XAD-treated hydrolysates of gelatin collagens give the same 14C ages (older than those of gelatin collagens) as the XAD-purified hydrolysates. The result indicates that the gelatin extraction method is sufficient for 14C dating on well-preserved bones, but insufficient on poorly preserved bones, because hot-water extraction does not totally remove exogenous organic carbon. Therefore, XAD-2 resin is recommended for accurate 14C and carbon isotope measurements.

DOI： 10.4116/jaqua.39.547

CiNii Research

The HVEE tandetron AMS system at Nagoya University

Nakamura T., Niu E., Oda H., Ikeda A., Minami M., Takahashi H., Adachi M., Pals L., Gottdang A., Suya N.

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms Vol. 172 ( 1-4 ) page： 52 - 57 2000

Language：Japanese Publisher：Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

In 1996/97, we installed a second-generation AMS system (model 4130-AMS) manufactured by HVEE, B.V., The Netherlands. Although we encountered a lot of problems during the installation and tuning up of the machine, our new system has now reached good stability and reproducibility in performing 14C/12C and 13C/12C measurements. According to the reproducibility tests conducted in January 1999, where six graphite targets prepared from HOxII standard material were measured, the standard deviation for 14C/12C reproducibility is around 1.6%e (comparable with counting statistics) and that for 13C/12C is 0.28%e. The background level of the AMS system was measured using a pure graphite (commercial graphite rod). It lies between 50 and 55 ka BP. We are still on the way to reduce the background. However, we are now prepared to start routine measurements of unknown-age samples. © 2000 Elsevier Science B. V. All rights reserved.

DOI： 10.1016/S0168-583X(00)00398-0

Scopus

A whole skerton of a Japanese Wolf collected from a cave at Mt. Kyonojo in Izumi-mura, Yatsushiro-gun, Kumamoto Prefecture

Vol. 11 page： 35-69 1999

Isotope fractionation by XAD-2 treatment

MINAMI Masayo, IKEDA Akiko

Summaries of Researches using AMS at Nagoya University Vol. 9 page： 308 - 311 1998.3

Language：Japanese Publisher：Nagoya University

XAD-2 resin is considered the good materials to separate quantitatively the polar amino acids from the less polar fulvic and humic acids. To evaluate if XAD-2 treatment affects isotope values, δ ^<13>C and δ ^<15>N were measured on bulk sample by a simple preparation, gelatin-collagen extracted by usual method, decalcified bone powder and XAD-purified hydrolysates from a modern well-preserved ivory sample "IVRY-1". Among three fractions of bulk, gelatin-collagen and decalcified ivory powder, there are almost no difference in both δ ^<13>C and δ ^<15>N. On the other hand, XAD-treated hydrolysate has apparently more positive δ ^<13>C and δ ^<15>N values than the three fractions. However, it is doubt whether the result is due to isotope fractionation by XAD-2 treatment because the fulvic and humic contamination in the collagen might affect isotope values of bulk, gelatin-collagen and decalcified ivory powder. The C/N ratio in fulvic and humic phases is significantly more higher than collagen. In the next study, we have to study modern collagen standards or amino acid standards to evaluate if XAD-2 resin introduce isotope fractionation.

CiNii Research

Approximate estimation method of the degree of lanthanide tetrad effect and application to the tetrad effects in lanthanide ionic radii

Minami M, Masuda A

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Vol. 177 page： 1021 - 1022 1998.1

Comparison of AMS radiocarbon ages between amino acids and collagens in fossil bones Reviewed

Minami, M. and Nakamura, T.

Chinese Science Bulletin Vol. 43 page： 89 1998

Y-Ho fractionation and lanthanide tetrad effect observed in cherts

Minami M, Masuda A, Takahashi K, Adachi M, Shimizu H

GEOCHEMICAL JOURNAL Vol. 32 ( 6 ) page： 405 - 419 1998

Effects of dietary docosahexaenoic acid on survival time and stroke-related behavior in stroke-prone spontaneously hypertensive rats

Minami M., Kimura S.I., Endo T., Hamaue N., Hirafuji M., Monma Y., Togashi H., Yoshioka M., Saito H., Watanabe S., Kobayashi T., Okuyama H.

General Pharmacology Vol. 29 ( 3 ) page： 401 - 407 1997.9

Language：Japanese Publisher：General Pharmacology

1. Dietary docosahexaenoic acid (DHA) suppressed the age dependent increase in systolic blood pressure and prolonged the average survival time of stroke-prone spontaneously hypertensive rats (SHRSP). 2. Dietary DHA (1% and 5% in diets) altered the circadian rhythm of SHRSP, causing significant increases in ambulatory activity during the dark period. At the onset of stroke, desynchronization with light and dark phases and new biological rhythms were noted in all of the control SHRSP (DHA 0%). DHA treated SHRSP did not show such behavioral changes. 3. These effects were accompanied by the increase of DHA and the decrease of AA levels in plasma and brain cortex. 4. It was concluded that dietary DHA suppresses the development of hypertension and stroke-related behavioral changes, resulting in prolongation of the SHRSP's life span.

DOI： 10.1016/S0306-3623(96)00487-9

Scopus

*Approximate estimation of the degree of lanthanide tetrad effect from the data potentially involving all lanthanides Reviewed

Minami, M. and Masuda, A.

Geochemical Journal Vol. 31 page： 125-133 1997

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Papers - MINAMI, Masayo