Zobrazeno 1 - 10
of 25
pro vyhledávání: '"N O. Ogawa"'
Publikováno v:
Biogeosciences, Vol 3, Iss 4, Pp 467-478 (2006)
In Livello Bonarelli black shale deposited during Cretaceous Oceanic Anoxic Event 2 (OAE-2, ca. 94 Ma), nitrogen isotopic compositions of bulk sediments are mostly in a narrow range from –2.7 to –0.7‰. We also determined molecular distribution
Externí odkaz:
https://doaj.org/article/38b0ae64c5124e9a854c1ba68a112a96
Autor:
Yuta Isaji, C. Yoshikawa, N. O. Ogawa, K. Matsumoto, A. Makabe, S. Toyoda, N. F. Ishikawa, H. Ogawa, H. Saito, M. C. Honda, N. Ohkouchi
Publikováno v:
Geochemistry, Geophysics, Geosystems, Vol 23, Iss 4, Pp n/a-n/a (2022)
Abstract Nitrogen isotope analysis of chloropigments provides information on the sources of nitrogenous nutrients assimilated by phytoplankton. The abundant, ubiquitous chlorophyll a records nitrogen isotopic compositions (δ15N) of eukaryotic phytop
Externí odkaz:
https://doaj.org/article/7961a903a80f433cb4a17bd9c340f0f0
Autor:
G. Mollenhauer, J. Friedrich, N. Ohkouchi, M. Butzin, N. O. Ogawa, M. Altabet, Y. Kashiyama, S. Kusch
Publikováno v:
Biogeosciences, Vol 7, Iss 12, Pp 4105-4118 (2010)
Chloropigments and their derivative pheopigments preserved in sediments can directly be linked to photosynthesis. Their carbon and nitrogen stable isotopic compositions have been shown to be a good recorder of recent and past surface ocean environmen
Externí odkaz:
https://doaj.org/article/b1bbced04a2b4f59924abf6430b071b2
Autor:
T. Goto, Hidetaka Nomaki, Katsunori Fujikura, Haruka Shibata, Yoshito Chikaraishi, Naohiko Ohkouchi, Hiroshi Kitazato, N. O. Ogawa, Toshi Nagata
Publikováno v:
Journal of Oceanography. 72:629-639
To estimate polychlorinated biphenyls (PCBs) pollution by the 2011 earthquake and tsunami off the Pacific coast of Tohoku, we report monitoring results of their concentration in deep-sea fish, benthic invertebrates, and sediments collected off Tohoku
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8326c18fde22464e9892414a683475c4
https://doi.org/10.1007/s10872-016-0359-z
https://doi.org/10.1007/s10872-016-0359-z
Autor:
G. Mollenhauer, J. Friedrich, N. Ohkouchi, M. Butzin, N. O. Ogawa, M. Altabet, Y. Kashiyama, S. Kusch
Publikováno v:
Biogeosciences, Vol 7, Iss 12, Pp 4105-4118 (2010)
Chloropigments and their derivative pheopigments preserved in sediments can directly be linked to photosynthesis. Their carbon and nitrogen stable isotopic compositions have been shown to be a good recorder of recent and past surface ocean environmen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::59422b206586bb4455a41899f4ae96fb
https://www.biogeosciences.net/7/4105/2010/
https://www.biogeosciences.net/7/4105/2010/
Autor:
Yusuke Yokoyama, Masako Yamane, Naohiko Ohkouchi, N. O. Ogawa, Hisami Suga, Naoto F. Ishikawa
Publikováno v:
Biogeosciences. 12:6781-6789
Periphytic algae attached to a streambed substrate (periphyton) are an important primary producer in stream ecosystems. We determined the isotopic composition of chlorophyll a in periphyton collected from a stream flowing on limestone bedrock in the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9f9575b91976aae2f15cc668f88ddf95
https://doi.org/10.5194/bg-12-6781-2015
https://doi.org/10.5194/bg-12-6781-2015
Autor:
Andrew L. Helton, Ryan M. Lau, Setsuko Wada, Itsuki Sakon, Naohiko Ohkouchi, Yoko Kebukawa, Izumi Endo, Seiji Kimura, N. O. Ogawa, Takashi Onaka
Publikováno v:
Proceedings of the International Astronomical Union. 14:343-344
The unidentified infrared (UIR) bands have been ubiquitously observed in various astrophysical environments and consist of a series of emission features arising from aromatic and/or aliphatic C-C and C-H bonds [1]. Therefore, their carriers are thoug
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d757fcf04577c95cc5c0d4f8af8cbe06
https://doi.org/10.1017/s1743921319001947
https://doi.org/10.1017/s1743921319001947
We determined the isotopic composition of chlorophyll a in periphytic algae attached to a streambed substrate (periphyton). The samples were collected from a stream flowing on limestone bedrock in the Seri River, central Japan. Stable isotope ratios
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6e329932c94e23cbae4846fc24235263
https://doi.org/10.5194/bgd-12-11089-2015
https://doi.org/10.5194/bgd-12-11089-2015
Autor:
Tsuyoshi Haraguchi, Takeshi Nakagawa, N. O. Ogawa, Richard A. Staff, Fiona Brock, C. Bronk Ramsey, Yoshito Chikaraishi, Jonathan J. Tyler, Naohiko Ohkouchi, Charlotte Bryant, Minoru Ikehara, Hitoshi Yonenobu, Yusuke Yokoyama, Yuichiro Kashiyama, Katsuya Gotanda
Publikováno v:
Geochemistry Geophysics Geosystems. 11
Joint carbon and nitrogen isotope measurements were made from chlorins (chlorophyll a, phaeophytin a and pyrophaeophytin a) extracted from the last glacial-interglacial transition sediments of Lake Suigetsu, central Japan. These data highlight both t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::143d399142d44620d95870a41e2e102a
https://doi.org/10.1029/2010gc003186
https://doi.org/10.1029/2010gc003186