Faculty Profiles - MINAMI, Masayo

Papers - MINAMI, Masayo

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Environment change to estimate from tree-ring cellulose of Japanese pine at Nagoya.

hayashi kazuki, minami masayo, nakamura tosio, nakatsuka takeshi

Abstracts of Annual Meeting of the Geochemical Society of Japan Vol. 56 ( 0 ) page： 129 - 129 2009

Summaries of "free discussion on Future view of the Center for Chronological Research" and "result of a questionnaire about convenience of the Accelerator mass Spectrometer facility in collaborated research(Proceedings of the 20^<th> Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2007)

MINAMI Masayo

Summaries of Researches using AMS at Nagoya University Vol. 19 ( 19 ) page： 169 - 173 2008.3

^<14>C abundances : An index for weathering of concrete construction(Proceedings of the 20^<th> Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2007)

Tanaka Tsuyoshi, Minami Masayo, Yoshida Hidekazu, Yoshida Shizuo

Summaries of Researches using AMS at Nagoya University Vol. 19 ( 19 ) page： 66 - 72 2008.3

Language：Japanese Publisher：Nagoya University

^<14>C abundances are measured across a weathering rind formed in Triassic calcareous sandstone. ^<14>C has not been detected by our sensitive AMS in the fresh sandstone, while about a half amount of the present ^<14>C is detected in the weathering rind of the sandstone. 14C is found to be a sensitive index of concrete weathering. The fresh concrete made from natural limestone does not contain any ^<14>C. Weathering in atmospheric condition will replace the dead carbon in the concrete with radiogenic ^<14>C and will be able to detect easily.

DOI： 10.18999/sumrua.19.66

CiNii Books

Variations of δ^<13>C, δ^<15>N values and 14C ages in human bone sections(Proceedings of the 20^<th> Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2007)

TAKIGAMI Mai, MINAMI Masayo, NAKAMURA Toshio

Summaries of Researches using AMS at Nagoya University Vol. 19 ( 19 ) page： 117 - 126 2008.3

Language：Japanese Publisher：Nagoya University

Prehistrical human bone is used for ^<14>C dating and isotope palaeodietary analysis. Fossil bone tends to be suffered from exogenous contaminants and diagenetic alteration during burial, especially in tropical and wet areas, and the state of bone collagen preservation differs with each bone sample. Since bone sections in an individual have different internal structures, such as density, thickness, amount of spongins and compact bone, different sections could have various levels of diagenesis. In this study, we investigated whether collagen extracted from different sections of an individual has variations of C/N ratios, δ^<13>C and δ^<15>N values for different sections of an individual, and whether we can estimate its palaeodietary by analyzing one bone section of a whole individual. The samples used are eleven bone sections (cranium, sphenoid, tooth, rib, humerus, radius or ulna, the lower femur, the central femur, tibia and two back-bones) in an individual, nine sections in another, and seven sections in the other, collected from the Yuigahama-minami archealogical site, Kamakura, Japan. The surface of fossil samples were shaved and ultrasonicated repeatedly in distilled water, followed by HCl and NaOH treatments; then samples were lyophilized and pulverized. The powdered bone sample was treated with 0.6M-HCl in a cellulose tube in a beaker over 20h at 4℃. The decalcified bone sample was treated by 0.6M-NaOH followed by 1.2M-HCl and 0.6M-HCl. Gelatin was extracted from acid/alkali-insoluble residue by heating in distilled water for 12h at 80-90℃. Combusted gelatin was refined into N_2 and CO_2. These gases were used for carbon and nitrogen isotopic measurement by using an isotope ratio mass spectrometer (Finnigan, MAT252). Gelatin was wrapped into a Sn cup and measured for C/N ratios by using an elemental analyzer (Euro Vector, Euro EA3000). To estimate sample preparation-induced variation, seven gelatins were extracted from a bone section, and each measured for C/N ratios, δ^<13>C and δ^<15>N values. The deviations of δ^<13>C and δ^<15>N values for seven gelatins are ±0.1‰ and ±0.2‰, respectively. Most bone sections have gelatin yield of more than 0.7 wt%, and carbon yield of the combusted gelatin between 42 and 46 wt%. Bone with more than 0.7 wt% gelatin is generally well preserved, and collagens with around 40 wt% C are intact. The bone samples in this study, therefore, are well preserved and regarded as suitable for analysis. The C/N ratios of gelatins varied from 3.1 to 3.4 with different sections in an individual. The values show quality of the gelatin extractions because the good collagens have C/N ratios between 2.9 and 3.6. The δ^<13>C values of gelatins have variations of about 1‰, between -19.3 and -18.2‰, for different bone sections in an individual. The other two individuals have variations between -19.3 and -18.4‰, and -18.3 and -17.7‰. The δ^<15>N values have variations of about 1.5‰ (12.6〜14.0‰, 12.4〜13.1‰ and 12.6〜14.1‰, respectively) for different sections of each individual. There is a positive correlation between δ^<13>C and δ^<15>N values. The back-bones tend to have highest values, and the rib and tooth have a little higher values than the others. ^<14>C ages have no variation in different sections. It means exterior organic substance don't get mixed in gelatin.

DOI： 10.18999/sumrua.19.117

CiNii Books

Is ^<14>C concentration higher for plants growing at high altitude Tibetan Plateau than those at the sea level?(Proceedings of the 20^<th> Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2007)

NAKAMURA Toshio, WATANABE Takahiro, MATSUNAKA Tetsuya, NISHIMURA Mitsugu, ZHU Liping, OHTA Tomoko, MINAMI Masayo

Summaries of Researches using AMS at Nagoya University ( 19 ) page： 110 - 116 2008.3

Publisher：Nagoya University

To answer a question whether ^<14>C concentration is higher for plants growing at high altitude locations than those growing at the sea level, we recently have collected plants samples from four sites at different altitudes: (1) plants from Lake Pumayum area at the altitude of 5030m; (2) plant samples from the suburbs of Lhasa city at the altitude of 4000m; (3) needle leaves from pine tree at 2600m-high location of Mt. Fuji; and (4) needle leaves from pine trees growing in the Higashiyama Campus of Nagoya University. The plant samples were rinsed with distilled water, treated chemically by an acid- alkali-acid treatment, and finally dried in an electric oven. A part of the samples were combusted to produce CO_2 and the produced CO_2 was changed to graphite for ^<14>C measurements with an AMS ^<14>C system at Nagoya University. The measured ^<14>C concentration was given in a ratio of sample ^<14>C/^<12>C to that of standard. For both sample and standard, isotopic fractionation was corrected. In addition, the decrease of ^<14>C concentration by radioactive decay for a standard from AD1950 to the year of sample collection was also corrected. ^<14>C concentrations were highest for the plant samples from Lake Pumayum showing a value of 1.081±0.016 in average, followed by the values of 1.055±0.005 for plants near Lhasa city, the values of 1.051±0,002 for plants from Mt. Fuji, and finally 1.017±0.003 for pine needles from Nagoya University. This clear altitude dependence may be explained preferably by Suess effect that is a dilution effect of modern ^<14>C concentration with dead carbon, containing no ^<14>C, produced by combustion of fossil fuel. The estimated altitude dependence of ^<14>C atom production is not strong and the resulting altitude dependence of ^<14>C concentration of CO_2 can fade out quickly by the strong air-mass mixing in the troposphere.

DOI： 10.18999/sumrua.19.110

The place name 'Umi' in Kamiyahagi of Ena City originated from the damming by a landslide triggered by Tensho Earthquake in 1586(Proceedings of the 20^<th> Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2007)

Suzuki Kazuhiro, Nakamurai Toshio, Kato Takenori, Ikeda Akiko, Goto Akiko, Oda Hirotaka, Minami Masayo, Kamikubo Hiroshi, Kajizuka Izumi, Adachi Kaori, Tsuboi Motohiro, Tokiwa Tetsuya, Oota Tomoko, Nishida Masami, Esaka Naoko, Tanaka Atsuko, Mori Shinobu, Dunkley Daniel J., Kusiak Monika A., Suzuki Satoko, Niu Etsuko, Nakazaki Mineko, Senda Ryoko, Kanagawa Kazuyo, Kumazawa Hiroyo

Summaries of Researches using AMS at Nagoya University ( 19 ) page： 26 - 38 2008.3

Publisher：Nagoya University

Umi is located along the Kamimura River within the Kamiyahagi area of southeastern Ena City, Gifu Prefecture. The name 'Umi' means sea or large lake; however, there are no lakes in the mountainous Kamiyahagi area. The Tokai Gou (torrential rain) flood of September 11-12, 2000 destroyed embankments along the river, and exposed sedimentary layers that are typical of a lacustrine depositional setting. This confirms the existence of a paleo-lake from which the name Umi originated. The ^<14>C ages, ranging from 280±37 to 345±25 BP, appear to be contemporaneous with Tensho Earthquake that occurred in central Japan on January 18, 1586.

DOI： 10.18999/sumrua.19.26

Reconstruction of climatic changes using δ^<13>C variations of annual tree-ring celluloses of a Japanese pine tree from Nagoya(Summaries of Research Using AMS)

HAYASHI Kazuki, MINAMI Masayo

Summaries of Researches using AMS at Nagoya University Vol. 19 ( 19 ) page： 175 - 183 2008.3

Language：Japanese Publisher：Nagoya University

We investigated the relationships between climatic factors and annual tree-ring data such as stable carbon isotopic composition and tree-ring width of a Japanese pine tree (Pinus thunbergii) with annual rings from 1955 to 2002, which was collected at the site of Environmental Studies Hall in Nagoya University. The climatic factors used are: month total values of sunshine duration and precipitation, month average values of day average temperature, relative humidity and vapor pressure in the Nagoya area. The annual rings of the sample are very wide in the periods from 1960-1970. This remarkable growth might be related with the local environment changes not with the regional environment changes because the annual-ring width shows no correlation with the climatic factors. The δ^<13>C fluctuations of the annual rings in the period from 1955 to 1979 are different from those in the period from 1980 to 2002. The result shows the change factors of δ^<13>C values in the two periods are different. In the period from 1955 to 1979, no-climatic environmental factors, that is, artificial factors such as air pollution effect the δ^<13>C fluctuations because they are not related with the climatic factors. In the period from 1980 to 2002, on the other hand, the month average values of relative humidity are good correlative with the δ^<13>C fluctuations of earlywood and latewood fractions, relatively.

DOI： 10.18999/sumrua.19.175

CiNii Books

Preliminary report of monitoring of vibration caused by earthquake-proof construction of Furukawa Memorial Hall(Summaries of Research Using AMS)

IKEDA Akiko, KATO Takenori, NAKAMURA Toshio, MINAMI Masayo, KUDO Yuichiro

Summaries of Researches using AMS at Nagoya University ( 19 ) page： 190 - 193 2008.3

Publisher：Nagoya University

Furukawa Memorial Hall is now under earthquake-proof construction and we are performing measurement of vibration caused by the construction to evaluate the influence given to a Tandetron Accelerator Mass Spectrometer and two CHIME machines installed in Furukawa Memorial Hall. In this report we described about the monitoring points of vibration and measurement equipments used for vibration measurement.

DOI： 10.18999/sumrua.19.190

Status and applications of Tandetron AMS system-II at Nagoya University in 2007(Proceedings of the 20^<th> Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2007)

NAKAMURA Toshio, MINAMI Masayo, ODA Hirotaka, KUDO Yuichiro, IKEDA Akiko, OMORI Takayuki, NISHIMOTO Hiroshi, HAYASHI Kazuki, OHTA Tomoko, NISHIDA Masami, SUYA Tokunori, SEKINO Tatsuya

Summaries of Researches using AMS at Nagoya University Vol. 19 ( 19 ) page： 39 - 45 2008.3

Language：Japanese Publisher：Nagoya University

A second ^<14>C-AMS system (Model 4130-AMS), built by High Voltage Engineering Europe (HVEE), B.V., The Netherlands, was delivered to Nagoya University in 1996/97. Acceptance tests were completed in January of 1999, and routine measurements began in mid-2000. Since completion of the acceptance tests in early 1999, we have encountered a lot of troubles with the machine, particularly in 2002. Since the end of 2002, the machine has relatively worked well, expect for minor problems. However, since June in 2006, we had a serious problem with the high voltage generation system. We opened the accelerator tank twice, in October of 2006 and July of 2007, and replaced each time totally 154 diodes and 5 resistors, 230 diodes and 5 resistors, respectively, for the high-voltage generator system used to rectify the AC power source and stabilize the DC current. Thus the number of targets measured was 1384 in 2007, which was almost the two-third of that in normal year. We also encountered troubles with (1) spark-oriented damage of a high voltage controller module, (2) a cooling system of the power generator for the analyzing magnets both for high energy and low energy beams. The cooling-water flow for the power generator was disturbed by chemical deposits in water tubes, and was not plenty enough to cool down the generator. A thermo-switch stopped the generator for safety and thus we could not operate the analyzing magnets. We replaced the damaged tubes to new ones. This trouble also limited the number of targets measured. Since November 1^<st>, 2007, we had a scheduled shutdown of the AMS system, owing to the improvements of the building, Furukawa Memorial Hall, against earthquake invasion expected in near future around Tokai area, central Japan, In April of 2008, we will start ^<14>C measurements again, possibly in a new good condition of the building.

DOI： 10.18999/sumrua.19.39

CiNii Books

Carbon isotopic fractionation during sample combustion and CO_2 purification : Comparison of δ^<13>C measured values between closed tube- and elemental analyzer-combusted samples(Proceedings of the 20^<th> Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2007)

Minami Masayo, Ohta Tomoko, Omori Takayuki, Nakamura Toshio

Summaries of Researches using AMS at Nagoya University ( 19 ) page： 160 - 168 2008.3

Publisher：Nagoya University

For combustion of samples a closed tube-combustion (CTC) method has been generally and widely used until now, but this method takes much time and labor. Recently we have investigated a CO_2 production and purification system using a commercial elemental analyzer (EA) connected to cryogenic traps, which enables fast combustion and CO_2 purification of samples. We compared δ^<13>C values between closed tube- and elemental analyzer-combusted samples of Oxalic Acid-II (new oxalic acid standard distributed by NIST; SRM4990c) and almost ^<14>C-free oxalic acid (Kishida[○!R]). For the CTC method δ^<13>C measured values tend to increase as sample amount is small relative to CuO amount. This might be due to absorption of more ^<12>C than ^<13>C to an inner wall of Pyrex tube and/or CuO. Furthermore, different δ^<13>C is observed by addition of Sulfix[○!R] to small amount of CO_2. δ^<13>C values measured by the EA method show good agreement with the results using the CTC method, and sample preparation background of ^<14>C is higher in the CTC method than the EA method, suggesting that this newly developed EA system shows high precision and accuracy. However, more detailed study and improvement on the EA system will be needed for different amounts of various standards such as IAEA standards.

DOI： 10.18999/sumrua.19.160

Strontium isotope analysis using Resonance Ionization Mass Spectrometry for determination of bone origin. Reviewed

Sasada, S., Watanabe, K., Higuchi, Y., Tomita, H., Goto, A., Minami, M., Suzuki, K., Kato, T., Hasegawa, T., Kawarabayashi, J. and Iguchi, T.

Journal of Nuclear Science and Technology Vol. 5 page： 97-100 2008

古人骨の同一個体内における部位の違いによるδ13C・δ15N値、14C年代の相違の有無

瀧上　舞・南　雅代・中村俊夫

名古屋大学加速器質量分析計業績報告書 Vol. XIX page： 117-126 2008

コンクリート風化の超長時間評価を目的とする石灰岩質砂岩地層の14C存在度変化

田中　剛・南　雅代・吉田英一・吉田鎮男

名古屋大学加速器質量分析計業績報告書 Vol. XIX page： 117-126 2008

試料燃焼－二酸化炭素精製における炭素同位体比分別　－封管法と元素分析計による試料調製の違い－

南　雅代・太田友子・大森貴之・中村俊夫

名古屋大学加速器質量分析計業績報告書 Vol. XX page： 160-168 2008

Areal distribution of strontium isotopic ratios of stream sediments in north and central Kyushu area

Goto Akiko, Minami Masayo, Asahara Yoshihiro

Abstracts of Annual Meeting of the Geochemical Society of Japan Vol. 55 ( 0 ) page： 382 - 382 2008

Radiocarbon ages of medieval human skeletons excavated from the Yuigahama archaeological site, Kamakura, Japan

Minami Masayo, Nakamura Toshio

Abstracts of Annual Meeting of the Geochemical Society of Japan Vol. 55 ( 0 ) page： 325 - 325 2008

Diverse microstructures from Archaean chert from the mount goldsworthy-mount grant area, pilbara craton, western australia: Microfossils, dubiofossils, or pseudofossils?

Kenichiro Sugitani, Kathleen Grey, Abigail Allwood, Tsutomu Nagaoka, Koichi Mimura, Masayo Minami, Craig P. Marshall, Martin J. Van Kranendonk, Malcolm R. Walter

PRECAMBRIAN RESEARCH Vol. 158 ( 3-4 ) page： 228 - 262 2007.10

Language：Japanese Publisher：ELSEVIER SCIENCE BV

A diverse assemblage of indigenous carbonaceous microstructures, classified here as highly probable microfossils to pseudomicrofossils, is present in the >ca. 2.97 Ga Farrel Quartzite (Gorge Creek Group) at Mount Grant and Mount Goldsworthy, Pilbara Craton, Western Australia. The microstructures are an integral part of the primary sedimentary fabrics preserved in black chert beds. The interbedding of chert with layers of large silicified crystal pseudomorphs and fine to coarse grained volcaniclastic/clastic beds indicate deposition in a partially evaporitic basin with terrigenous clastic and volcaniclastic input.
Similar associations of microstructures are present at the same stratigraphic level in outcrops more than 2 km apart. Four major microstructural types are present: thread-like, film-like, spheroidal and lenticular to spindle-like, each of which can be further subdivided into several sub-types. Most of the microstructures were deposited as part of an assemblage of chemical and clastic sediments, although there are some thread-like microstructures present for which a synsedimentary origin cannot be confirmed. Many specimens appear to have originally had flexible but breakable walls and some occur in colony-like aggregations. Size distributions for the four major types are generally narrow, a feature typical of biogenic structures. The microstructures are composed of disordered carbon (as revealed by Raman spectroscopy) and the bulk isotopic composition of the carbon is delta C-13<-30per mil, which is consistent with biological processing.
The combined morphological and geological evidence suggests that the film-like structures, small spheres associated with films, large spheroids and spindle-like structures are probable to highly probable fossil remains of microorganisms. The morphological variety among the microstructures suggests that a diverse microbial ecosystem flourished in the Pilbara region during the Archaean. (c) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.precamres.2007.03.006

Web of Science

Scopus

Radiocarbon and C-13 variations during the last 300 years in lacustrine sediments of Lake Biwa, central Japan

Minami M., Tane N., Nakamura T.

GEOCHIMICA ET COSMOCHIMICA ACTA Vol. 71 ( 15 ) page： A669 - A669 2007.8

Radiocarbon and C-13 variations during the last 300 years in lacustrine sediments of Lake Biwa, central Japan

Minami M, Tane N, Nakamura T

GEOCHIMICA ET COSMOCHIMICA ACTA Vol. 71 ( 15 ) page： A669 - A669 2007.8

High precision C-14 measurements and wiggle-match dating of tree rings at Nagoya University Reviewed

Toshio Nakamura, Hiroko Miyahara, Kimiaki Masuda, Hiroaki Menjo, Kohsuke Kuwana, Katsuhiko Kimura, Mitsuru Okuno, Masayo Minami, Hirotaka Oda, Andrzej Rakowski, Tomoko Ohta, Akiko Ikeda, Etsuko Niu

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS Vol. 259 ( 1 ) page： 408 - 413 2007.6

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

An AMS system dedicated to C-14 measurement (486-AMS) built by HVEE BN. The Netherlands, was delivered to Nagoya University in 1996, and is in use for routine C-14 measurements. The relative error of the standard deviation (1 sigma) of C-14/C-12 ratios is 10.3% to +/- 0.5% (somewhat larger than the uncertainty of +/- 03% from C-14 counting statistics) and that of the corresponding C-13/C-12 ratios is +/- 0.03% to +/- 0.07%, as measured for HOxII standards. By using this AMS system, we are now testing whether the recommended IntCa104 C-14 calibration data set is consistent with the natural C-14-concentration variations as recorded in Japanese trees. Here we report the results of these consistency tests and accurate age determination of tree rings grown in Japan, using the C-14 wiggle matching technique. (c) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nimb.2007.02.005

Web of Science

Scopus

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Papers - MINAMI, Masayo