Search Results 1-20 of 1054

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Effect of ontogenetic changes of feeding habits on total mercury level in red stingray, Hemitrygon akajei

Duangdee Teerapong , Jaingam Wachirah , Kobayashi Jun , Tsutsumi Hiroaki

… Therefore, mature females with larger bodies tend to acceleratedly accumulate THg and reached a max. 1,370 ng g−1 dw, although the stable isotope analysis of carbon and nitrogen of the muscles of the mature females indicates the descent of the trophic position to the immature ones in the food web system. …

Japanese Journal of Environmental Toxicology 24(0), 12-25, 2021

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2

Functions of Organic Components Involved in Crop Growth Revealed by the Use of Isotope Tracer Experiment [in Japanese]

Nihei Naoto , Ichihashi Yasuhiro

植物が外部から吸収する栄養として無機成分と有機成分があるが，植物の有機成分の利用についてはその複雑さ故に不明な部分が多い。しかし，炭素や窒素の安定同位体（13C, 15N），放射性同位体（14C）等のアイソトープで標識した有機成分を用いた緻密な …

RADIOISOTOPES 70(1), 29-39, 2021

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3

A destination for long-distance ocean migration in Pacific salmon : insights from stable nitrogen isotope ratios [in Japanese]

松林順

海洋と生物 42(5), 439-445, 2020-10
4

Analysis of Organic Matter Source Using Carbon and Nitrogen Stable Isotope [in Japanese]

長濱祐美

水環境学会誌 43(9), 321-324, 2020-09
5

Nitrogen source utilization in co-existing canopy tree and dwarf bamboo in a northern hardwood forest in Japan

Tateno Ryunosuke , Nakayama Masataka , Yano Midori , Fukuzawa Karibu , Inagaki Yoshiyuki , Koba Keisuke , Ugawa Shin

… Nitrogen (N) competition among co-existing plant species utilizing different mycorrhiza types was explored through the investigation of N sources of oak trees and dwarf bamboo. …

Trees (34), 1047-1057, 2020-08

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6

Discrimination of nursery locations of juvenile Japanese flounder Paralichthys olivaceus on the Pacific coast of northern Japan based on carbon and nitrogen stable isotope ratios

Kato Yoshikazu , Togashi Hiroyuki , Kurita Yutaka , Kamauchi Hiromitsu , Tayasu Ichiro

Fisheries science 86(4), 615-623, 2020-07
7

A preliminary study on geochemistry of shallow groundwater in the highly-urbanized Shinagawa district, central Tokyo, Japan [in Japanese]

伊東優希 , 安原正也 , 李盛源 , 中村高志 , 稲村明彦

地球環境研究 = Bulletin of geo-environmental science (22), 111-121, 2020
8

Research concept on new hardware and software for the near future of groundwater science [in Japanese]

AICHI Masaatsu , TOMIGASHI Akira

2010年から2019年までの10年間を対象として地下水学会誌に登載された論文45編と短報19編のキーワードを抽出し，研究テーマ別に類型化したところ，年代測定・同位体比等や硝酸性窒素・脱窒等に関する研究が多く報告されていることがわかった。この結果を踏まえて本報では，近年にほとんど報告がなかった分野となる「地下水モデリング技術の不確実性の可視化」，「リアルタイムのデータ解析と情報発 …

Journal of Groundwater Hydrology 62(4), 547-561, 2020

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9

Quantifying triple oxygen isotopic compositions of nitrous acid and nitrogen dioxide using a multi-stage filter sampler [in Japanese]

Lai Peng , Nakagawa Fumiko , Tsunogai Urumu , Ding Dong , Noguchi Izumi , Yamaguchi Takashi

ガス状亜硝酸(HONO)は窒素酸化物(NOx)の酸化除去反応を駆動するOHラジカルを放出するため、大気化学的に重要な微量気体成分である。フィルターパック法を用いて、HONOおよびNO2をNO2-態で捕集し、その三酸素同位体組成を定量したが、炭酸 …

Abstracts of Annual Meeting of the Geochemical Society of Japan 67(0), 6, 2020

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10

Fractionation of carbon and nitrogen isotopes in biological processes [in Japanese]

Chikaraishi Yoshito , Takizawa Yuko

生物に含まれる有機化合物には，軽い安定同位体(H, 12C, または14N)が濃縮しているものと，その反対に重い安定同位体(D, 13C, または15N)が濃縮しているものが存在する。しかし，「どのような生化学反応によって，どの有機化合物のどの元素に同位体分別がもたらされるか」，そして「その大きさ(程度)が，周辺の環境や条件に応じて変化するかどうか」に関する研究はほとんど行われて …

Abstracts of Annual Meeting of the Geochemical Society of Japan 67(0), 103, 2020

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11

Life stage-related changes in dietary habits and ecological niche of the Sakhalin taimen Parahucho perryi in the Shumarinai Lake system, Hokkaido, Japan [in Japanese]

Shimoda Kazutaka , Nakajima Miyuki , Kawamula Hiloshi

… were estimated from the analyses of carbon and nitrogen stable isotope ratios in the Shumarinai Lake system, Hokkaido, Japan. … Stable isotope ratios of both elements in 0+ fry in a feeder stream were within the range of stable isotope ratios in other fish species collected from the same stream, although nitrogen stable isotope ratios in co-existing 1+ juveniles were 0.84‰ to 2.10‰ higher than in the latter. …

Japanese Journal of Ichthyology 67(2), 223-229, 2020

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12

Nitrogen and Oxygen Isotope Signatures of Nitrogen Compounds during Anammox in the Laboratory and a Wastewater Treatment Plant

Kotajima Shotoku , Fujitani Hirotsugu , Ushiki Norisuke , Tsuneda Satoshi , Yoh Muneoki , Koba Keisuke , Ikeda Daisuke , Terada Akihiko , Isaka Kazuichi , Nishina Kazuya , Kimura Yuuya , Makabe Akiko , Yano Midori

… We performed batch incubation experiments with an anammox-dominated biomass to investigate nitrogen (N) and oxygen (O) isotopic fractionation factors during anammox and also examined apparent isotope fractionation factors during anammox in an actual wastewater treatment plant. …

Microbes and Environments 35(4), n/a, 2020

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13

Trophic segregation in a burrow: the stable carbon and nitrogen isotope ratios of the burrowing shrimp Upogebia major and its commensal bivalve Cryptomya busoensis

Seike Koji , Goto Ryutaro

… Samples for carbon and nitrogen stable isotope analysis were collected from a tidal flat near the tidal inlet of Akkeshi Lake, Hokkaido, northern Japan in April 2013. … The stable carbon and nitrogen isotope analysis showed that important food sources for both U. …

Plankton and Benthos Research 15(3), 220-227, 2020

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14

Comparison of Artificial Rock Using Dredged Soil and Steel Slag with Natural Rock on the Effect of Biological Gathering [in Japanese]

Miyamukai Tomoki , Imao Kazumasa , Tasaki Tomoaki , Akashi Yuuzou , Suzuki Teruaki , Tanaka Yoshito

… And the nitrogen and carbon stable isotope ratios of the biological communities gathering on artificial reefs were compared with surrounding area.For seaweeds, their appearances differed depending on the species, Sargassum horneri … The stable isotope ratios of nitrogen and carbon suggested that the artificial rock has a food linkage structure equivalent to that of the surrounding area. …

Journal of Fisheries Engineering 57(1), 11-25, 2020

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15

Growth and nitrogen isotope ratio of trees by elevation in the subalpine zone of Nagano Prefecture [in Japanese]

Tanaka-Oda Ayumi , Takai Nonoko , Takei Gen , Makita Noki , Yasue Koh , Kobayashi Hajime

窒素は樹木の成長に必須の栄養素であり、森林生態系は一般的に窒素が不足しやすい。その一方で、急激な温暖化による森林の成長増加や、有機物の無機化促進される可能性が指摘されている。山岳地域は低標高地域に比べて冷温であり、厳しい窒素制限下にあることからも、温暖化の影響を受けやすい可能性がある。そこで、信州大学農学部西駒ステーションに設置された、標高2000、2200、2400mの調査プロ …

The Japanese Forest Society Congress 131(0), 823, 2020

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16

Spatio-temporal variation and its determinants of the denitrification within groundwater body in forested catchments [in Japanese]

Shirai Ryota , Katsuyama Masanori , Fukushima Keitaro , Onishi Yuji , Koba Keisuke

森林流域において地下水中で起きている脱窒は硝酸イオンの消費反応として重要であり，渓流水の硝酸イオン濃度にも影響を及ぼす。本研究では，滋賀県南部の桐生水文試験地内の複数地点において平水時に地下水を約1ヶ月に1回の間隔で1年間採取し，硝酸イオンの濃度および窒素・酸素安定同位体比を測定することで，地下水における脱窒プロセスの時空間変動について考察を行った。窒素・酸素安定同位体比の変動を …

The Japanese Forest Society Congress 131(0), 565, 2020

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17

Migratory Pattern of the Spotted Scat (Scatophagus argus) in the Mangrove Estuary of the Matang Mangrove Forest Reserve, Malaysia, Estimated by Stable Isotope Analysis

MORIOKA Shinsuke , TANAKA Katsuhisa , YURIMOTO Tatsuya , KASSIM Faizul M. , OKAMURA Kazumaro

… Stable isotope ratios of carbon (δ13C) and nitrogen (δ15N) were determined for the spotted scat (Scatophagus argus) in the Matang Mangrove Forest Reserve in Peninsular Malaysia. … The carbon isotope ratio in the fish body tended to be lower in fish sampled from the inner estuary as compared with fish at the river mouth. …

Japan Agricultural Research Quarterly: JARQ 54(2), 193-199, 2020

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18

Erratum: A biochemical investigation on the natural diets of the long spined-sea urchin Diadema setosum [in Japanese]

NIWA KENTARO , CHOW SEINEN , KUROGI HIROAKI , SAWAYAMA SHUHEI , KAJIGAYA YOSHIKAZU , TERAMOTO WATARU , ORITA RYO , ISHIHI YUKA , SHIBUNO TAKURO , HAYAKAWA JUN

… 9頁　英文要旨5-6行目誤：The nitrogen stable isotope ratio of the reared individuals was significantly higher … than that of the wild individuals,正：The nitrogen stable isotope ratio of the reared individuals was significantly lower …

NIPPON SUISAN GAKKAISHI 86(2), 141-141, 2020

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19

A Cryogen-Free Automated Measurement System of Stable Carbon Isotope Ratio of Atmospheric Methane

Umezawa Taku , Andrews Stephen J. , Saito Takuya

メタンは気候変動および大気化学において重要な役割を担っているが、その放出源が多様であるため、全球収支は依然として不確実である。大気中メタンの安定炭素同位体比（δ13C-CH4）は、様々な放出源の寄与を分離推定するために有用だが、分析法が複 …

Journal of the Meteorological Society of Japan. Ser. II 98(1), 115-127, 2020

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20

Feeding ecology of a mysid species, Neomysis awatschensis in the Lake Kasumigaura: combining approach with microscopy, stable isotope analysis and DNA metabarcoding

Nakamura Yasuhide , Tuji Akihiro , Makino Wataru , Matsuzaki Shin-ichiro S. , Nagata Nobuaki , Nakagawa Megumi , Takamura Noriko

… by combining three methods to eliminate methodological biases: DNA metabarcoding, microscopy and stable isotope analysis. … Mesozooplankton prey, such as copepods, were detected both using DNA metabarcoding and microscopy, but they could not be a major food source due to the low nitrogen stable isotopic signature of the mysids. …

Plankton and Benthos Research 15(1), 44-54, 2020

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