 |
 |
 in press |
| Kurosawa, K., Sugita, S., Ishibashi, K., Hasegawa, S., Sekine, Y., Ogawa,
N.O., Kadono, T., Ohno, S., Ohkouchi, N., Nagaoka, Y., and Matsui, T. (2013) Hydrogen cyanide production due to
mid-size impacts in a redox-neutral N2-rich atmosphere. Origins of Life and Evolution of Biospheres, in press. |
Naito, Y., Chikaraishi, Y., Ohkouchi, N., and Yoneda, M. (2013) Evaluation of carnivory in inland Jomon hunter-gatherers
based on nitrogen isotope ratios of individual amino acids in bone collagen.
Journal of Archaeological Science, in press.
|
| Ohkouchi, N. and Takano, Y. (2013) Organic nitrogen: sources, fates, and chemistry. Treatise on Geochemistry, 10: Organic Geochemistry (Edited by Birrer, B., Falkowski, P., Freeman, K.), Elsevier, in press. |
| 2013 |
| Kaneko, M., Naraoka, H., Takano, Y., and Ohkouchi, N. (2013) Distribution and isotopic signatures of archaeal lipid biomarkers
associated with gas hydrate occurrences on the northern Cascadia Margin.
Chemical Geology,
343, 76-84, in press. |
| Ohkouchi, N., Tsuda, R., Chikaraishi, Y., and Tanabe, K. (2013) A preliminary estimate
of the trophic position of the deep-water ram’s horn squid Spirula spirula
based on the nitrogen isotopic composition of amino acids. Marine Biology, 160(4), 773-779, DOI:10.1007/s00227-012-2132-1. |
Takano, Y., Kaneko, M., Kahnt, J., Imachi, H., Shima, S., and Ohkouchi, N. (2013) Detection of coenzyme F430 in deep sea sediments: A key molecule
for biological methanogenesis. Organic Geochemistry, 58, 137-140, DOI:10.1016/j.orggeochem.2013.01.012.
|
| 2012 |
Chikaraishi Y., Kaneko, M., and Ohkouchi N. (2012) Stable hydrogen and carbon isotopic compositions of long-chain
(C21-C33)
n-alkanes and n-alkenes in insects. Geochimica et Cosmochimica
Acta, 95(15), 53-62.
|
Miller M.J., Chikaraishi Y., Ogawa N.O., Yamada Y., Tsukamoto K., and
Ohkouchi N. (2012) A low trophic position of Japanese eel larvae indicates feeding
on marine snow. Biology Letters, DOI:10.1098/rsbl.2012.0826.
|
Ogawa N.O., Chikaraishi Y., and Ohkouchi N. (2012) Trophic position
estimates of formalin-fixed samples with nitrogen isotopic compositions of amino
acids: an application to gobiid fish (Isaza) in Lake Biwa, Japan. Ecological
Research, DOI:10.1007/s11284-012-0967-z.
|
| Sakuma, H., Tada, R., Ikeda, M., Kashiyama, Y., Ohkouchi, N., Ogawa, N.O., Watanabe, S., Tajika, E., and Yamamoto, S. (2012) High-resolution
lithostratigraphy and organic carbon isotope stratigraphy of the Lower
Triassic pelagic sequence in central Japan. Island Arc, 21, 79-100. |
Takano, Y., Tyler, J.J., Kojima, H., Yokoyama, Y., Tanabe, Y., Sato, T., Ogawa,
O.N., Ohkouchi, N., and Fukui, M. (2012) Holocene lake development and
glacial-isostatic uplift at Lake Skallen and Lake Oyako, Lutzow-Holm Bay, East
Antarctica: based on biogeochemical facies and molecular signatures. Applied
Geochemistry, 27(12), 2546-2559, DOI:10.1016/j.apgeochem.2012.08.009.
|
Takishita, K., Chikaraishi, Y., Leger, M., Kim, E., Yabuki, A., Ohkouchi,
N., and Roger, A.J. (2012) Lateral transfer of tetrahymanol-synthesizing
genes has allowed multiple diverse eukaryote lineages to independently adapt to
environments without oxygen. Biology Direct, 7(5),
DOI:10.1186/1745-6150-7-5.
|
| 2011 |
Chikaraishi, Y., Ogawa, N.O., Doi, H., and Ohkouchi, N. (2011)
15N/14N ratios of amino acids as a tool for studying
terrestrial food webs: a case study of the terrestrial insects (bees, wasps, and
hornets). Ecological Research, DOI:10.1007/s11284-011-0844-1.
|
Enge, A.J., Nomaki, H., Ogawa, N.O., Witte, U., Moeseneder, M.M., Lavik, G.,
Ohkouchi, N., Kitazato, H., Kučera, M., and Heinz, P. (2011) Response of
the benthic foraminiferal community to a simulated short-term phytodetritus
pulse in the abyssal North Pacific. Marine Ecology Progress Series,
438, 129-142.
|
Kohzu, A., Imai, A., Ohkouchi, N., Fukushima, T., Kamiya, K., Komatsu,
K., Tomioka, N., Kawasaki, N., Miura, S., and Satou, T. (2011) Direct evidence
for the alteration of 13C natural abundances during early diagenesis
in Lake Kasumigaura, Japan. Geochemistry, Geophysics, Geosystems,
12, DOI:10.1029/2011GC003532.
|
Kuroda, J., Tanimizu, M., Hori, R. S., Suzuki, K., Ogawa, N. O., Tejada, M. L.
G., Coffin, M. F., Coccioni, R., Erba, E., and Ohkouchi, N. (2011) Lead
isotopic record of Barremian-Aptian marine sediments: Implications for large
igneous provinces and the Aptian climatic crisis. Earth and Planetary Science
Letters, 307, 126-134.
|
Nomaki, H., Ogawa, N. O., Takano, Y., Suga, H., Ohkouchi, N., and
Kitazato, H. (2011) Differing utilization of glucose and algal particulate
organic matter by deep-sea benthic ecosystems of Sagami Bay, Japan. Marine
Ecology Progress Series, 431, 11-24.
|
Sekine, Y., Suzuki, K., Senda, R., Goto, K.T., Tajika, E., Tada, R., Goto, K.,
Yamamoto, S., Ohkouchi, N., Ogawa, N.O., and Maruoka, T. (2011) Osmium
evidence for synchronicity between a rise in atmospheric oxygen and
Palaeoproterozoic deglaciation. Nature Communications, 2(502),
DOI:10.1038/ncomms1507.
|
Strable M. S., Tschanz, C. L., Varamini, B., Chikaraishi, Y., Ohkouchi,
N., and Brenna, J. T. (2011) Mammalian DNA δ15N exhibits 40‰
intramolecular variation and is unresponsive to dietary protein level. Rapid
Communications in Mass Spectrometry, 25, 3555-3562.
|
Tayasu, I., Hirasawa, R., Ogawa, N. O., Ohkouchi, N., and Yamada, K.
(2011) New organic reference materials for carbon- and nitrogen-stable isotope
ratio measurements provided by Center for Ecological Research, Kyoto University,
and Institute of Biogeosciences, Japan Agency for Marine-Earth Science and
Technology. Limnology, DOI:10.1007/s10201-011-0345-5.
|
Toyoda, S., Yano, M., Nishimura, S., Akiyama, H., Hayakawa, A., Koba, K., Sudo,
S., Yagi, K., Makabe, A., Tobari, Y., Ogawa, N.O., Ohkouchi, N., Yamada,
K., and Yoshida, N. (2011) Characterization and production and consumption
processes of N2O emitted from temperate agricultural soils determined
via isotopomer ratio analysis. Global Biogeochemical Cycles, 25,
GB2008, DOI:10.1029/2009GB003769.
|
Yamazaki, A., Watanabe, T., Ogawa, N.O., Ohkouchi, N., Shirai, K.,
Toratani, M., and Uematsu, M. (2011) Seasonal variations in the nitrogen isotope
composition of Okinotori coral in the tropical western Pacific: A new proxy for
marine nitrate dynamics. Journal of Geophysical Research -
Biogeosciences, 116, DOI:10.1029/2011JG001697.
|
Zhou, Y., Grice, K., Chikaraishi, Y., Stuart-Williams, H., Farquhar, G. D., and
Ohkouchi, N. (2011) Temperature effect on leaf water deuterium enrichment
and isotopic fractionation during leaf lipid biosynthesis: Results from
controlled growth of C3 and C4 land plants. Phytochemistry, 72,
207-213.
|
| 2010 |
Kashiyama, Y., Ogawa, N.O., Chikaraishi, Y., Kashiyama, N., Sakai, S., Tanabe,
K., and Ohkouchi, N. (2010) Reconstructing the life history of modern and
fossil nautiloids based on the nitrogen isotopic composition of shell organic
matter and amino acids. Cephalopods - Present and Past, Tokai University
Press, Tokyo, p.67-75.
|
Kuroda, J., Suzuki, K., and Ohkouchi, N. (2010) Linkage between massive
volcanic events and global extreme climatic events in the Cretaceous period.
Journal of Geography, 119(3), 534-555.
|
Kuroda, J., Hori, R. S., Suzuki, K., Gröcke, D. R., and Ohkouchi, N.
(2010) Marine osmium isotope record across the Triassic-Jurassic boundary from a
Pacific pelagic site. Geology, 38, 1095-1098.
|
Kusch, S., Kashiyama, Y., Ogawa, N. O., Altabet, M., Butzin, M., Friedrich, J.,
Ohkouchi, N., and Mollenhauer, G. (2010) Implications for chloro- and
pheopigment synthesis and preservation from combined compound-specific
δ13C, δ15N, and Δ14C analysis.
Biogeosciences, 7, 4105-4118.
|
Naito, Y., Chikaraishi, Y., Ohkouchi, N., Mukai, H., Shibata, Y., Honch,
N. V., Dodo, Y., Ishida, H., Amano, T., Ono, H., and Yoneda, M. (2010) Dietary
reconstruction of the Okhotsk Culture of Hokkaido, Japan, based on nitrogen
isotopic composition of amino acids: implication for correction of 14C marine
reservoir effects on human bones. Radiocarbon, 52, 671-681.
|
Naito, Y., Honch, N V.., Chikaraishi, Y., Ohkouchi, N., and Yoneda, M.
(2010) Quantitative evaluation of marine protein contribution in ancient diets
based on nitrogen isotope ratios of individual amino acids in bone collagen: An
investigation at the Kitakogane Jomon site. American Journal of Physical
Anthropology, 143, 31-40.
|
Sekine, Y., Tajika, E., Ohkouchi, N., Ogawa, N. O , Goto, K., Tada, R.,
Yamamoto, S., and Kirschvink, J. L. (2010) Anomalous negative excursion of
carbon isotope in organic carbon after the last Paleoproterozoic glaciations in
North America. Geochemistry Geophysics Geosystems, 11, Q08019,
DOI: 10.1029/2010GC003210.
|
Takano, Y., Chikaraishi, Y., Ogawa, N. O., Nomaki, H., Morono, Y., Inagaki, F.,
Kitazato, H., Hinrichs, K..-U., and Ohkouchi, N. (2010) Sedimentary
membrane lipids recycled by deep-sea benthic archaea. Nature Geosciences,
3, 858-861. DOI:10.1038/ngeo983.
|
Takano, Y., Kashiyama, Y., Ogawa, N. O., Chikaraishi, Y., and Ohkouchi,
N. (2010) Isolation and desaltation with caton-exchange chromatography for
compound-specific nitrogen isotope analysis of amino acids: application to
biogeochemical samples. Rapid Communications in Mass Spectrometry,
24, 2317-2323.
|
Takano, Y., Yokoyama, Y., Tyler, J.J., Kojima, H., Fukui, M., Sato, T., Ogawa,
N.O., Suzuki, N., Kitazato, H., Ohkouchi, N. (2010) Crustal uplifting
rate associated with late-Holocene glacial-isostatic rebound at Skallen and
Skarvsnes, Lutzow-Holm Bay, East Antarctica: evidence of a synchrony in
sedimentary and biological facies on geological setting. Biogeosciences
Discuss, 7, 4341-4384, doi:10.5194/bgd-7-4341-2010.
|
Tyler, J., Kashiyama, Y., Ohkouchi, N., Ogawa, N. O , Yokoyama, Y.,
Chikaraishi, Y., Staff, R. A., Ikehara, Bronk Ramsey, C., Bryant, C., Brock, F.,
Gotanda, K., Haraguchi, T., Yonenobu, H., and Nakagawa, T. (2010) Tracking
aquatic change using chlorin-specific carbon and nitrogen isotopes: The last
glacial-interglacial transition at Lake Suigetsu, Japan. Geochemistry
Geophysics Geosystems, 11, Q09010, DOI:10.1029/2010GC003186.
|
Yamaguchi, K., Oguri, K., Ogawa, N. O , Sakai, S., Hirano, S., Kitazato, H., and
Ohkouchi, N. (2010) Geochemistry of modern carbonaceous sediments
overlain by a water mass showing photic zone anoxia in the saline meromictic
Lake Kai-ike, southwest Japan: I. Early diagenesis of organic carbon, nitrogen,
and phosphorus. Palaeogeography, Palaeoclimatology, Palaeoecology,
294, 72-82.
|
Yokoyama, Y., Koizumi, M., Matsuzaki, H., Miyairi, Y., and Ohkouchi, N.
(2010) Developing ultra small-scale radiocarbon sample measurement at the
University of Tokyo. Radiocarbon. 52, 310-318.
|
| 2009 |
| Bassez, M.-P., Takano, Y., and Ohkouchi, N. (2009) Organic analysis of
peridotite rocks from Ashadze and Logatchev hydrothermal sites. International
Journal of Molecular Sciences, 10, 2986-2998. |
Chikaraishi, Y., Ogawa, N.O., Kashiyama, Y., Takano, Y., Suga, H., Tomitani, A.,
Miyashita, H., Kitazato, H., and Ohkouchi, N. (2009) Determination of
aquatic food-web structure based on compound-specific nitrogen isotopic
composition of amino acids. Limnology and Oceanography: Methods,
7, 740-750.
|
Chikaraishi, Y., Tanaka, R., Tanaka, A., and Ohkouchi, N. (2009)
Fractionation of hydrogen isotopes during phytol biosynthesis. Organic
Geochemistry, 40, 569-573.
|
Nomaki, H., Ohkouchi, N., Heinz, P., Suga, H., Chikaraishi, Y., Ogawa,
N.O., Matsumoto, K., and Kitazato, H. (2009) Degradation of algal lipids by
deep-sea benthic foraminifera: An in situ tracer experiment. Deep-Sea
Research I, 56, 1488-1503.
|
Takano, Y., Chikaraishi, Y., Ogawa, N. O., Kitazato, H., and Ohkouchi, N.
(2009) Compound-specific nitrogen isotope analysis of D-alanine, L-alanine, and
valine: Application of diastereomer separation to δ15N and microbial
peptidoglycan studies. Analytical Chemistry, 81, 394-399.
|
Tejada, M. L. G., Suzuki, K., Kuroda, J., Coccioni, R., Mahoney, J. J.,
Ohkouchi, N., Sakamoto, T., and Tatsumi, Y. (2009) Ontong Java Plateau
eruption as a trigger for the early Aptian oceanic anoxic event. Geology,
37, 855-858.
|
| 2008 |
Chikaraishi, Y., Kashiyama, Y., Ogawa, N. O., Kitazato, H., Satoh, M., Nomoto,
S., and Ohkouchi, N. (2008) A compound-specific isotope method for
measuring the stable nitrogen isotopic composition of tetrapyrroles. Organic
Geochemistry, 39, 510-520.
|
Jenkins, R. G., Hikida, Y., Chikaraishi, Y., Ohkouchi, N., and Tanabe, K.
(2008) Microbially induced formation of ooid-like coated grains in the Late
Cretaceous methane-seep deposits of the Nakagawa area, Hokkaido, northern Japan.
Island Arc, 17, 261-269.
|
Kashiyama, Y., Miyashita, H., Ogawa, N.O., Chikaraishi, Y., Takano, Y., Suga,
H., Toyofuku, T., Nomaki, H., Kitazato, H., Nagata, T., and Ohkouchi, N.
(2008) Evidence of global chlorophyll d. Science, 321, 658.
|
Kashiyama, Y., Ogawa, N. O., Kuroda, J., Shiro, M., Nomoto, S., Tada, R.,
Kitazato, H., and Ohkouchi, N. (2008) Diazotrophic cyanobacteria as the
major photoautotrophs during mid-Cretaceous Oceanic Anoxic Events: nitrogen and
carbon isotopic evidence from sedimentary porphyrin. Organic
Geochemistry, 39, 532-549.
|
Kashiyama, Y., Ogawa, N. O., Shiro, M., Tada, R., Kitazato, H., and Ohkouchi,
N. (2008) Reconstruction of the biogeochemistry and ecology of
photoautotrophs based on the nitrogen and carbon isotopic compositions of
vanadyl porphyrins from Miocene siliceous sediments. Biogeosciences,
5, 797-816.
|
Neal, C. R., Coffin, M. F., Arnt, N. T., Duncan, R. A., Eldholm, O., Erba, E.,
Farnetani, C., Fitton, G., Ingle, S. P., Ohkouchi, N., Rampino, M. R.,
Reicow, M. K., Self, S., and Tatsumi, Y. (2008) Investigatin large igneous
province formation and associated paleoenvironmental events: A white paper for
scientific drilling. Scientific Drilling, 6, 4-18.
|
Nomaki, H., Ogawa, N. O., Ohkouchi, N., Suga, H., Toyofuku, T.,
Shimanaga, M., Nakatsuka, T., and Kitazato, H. (2008) Benthic foraminifera as
trophic links between phytodetritus and benthic metazoans: carbon and nitrogen
isotopic evidence. Marine Ecology Progress Series, 357,
153-164.
|
Ohkouchi, N. and Eglinton, T. I. (2008) Compound-specific radiocarbon
dating of Ross Sea sediments: A prospect for constructing chronologies in
high-latitude oceanic sediments. Quaternary Geochronology, 3,
235-243.
|
Ohkouchi, N., Nakajima, Y., Okada, H., Ogawa, N. O., Chikaraishi, Y.,
Suga, H., Sakai, S., and Kitazato, H. (2008) Carbon isotopic composition of
tetrapyrrole nucleus in chloropigments from a saline meromictic lake: A
mechanistic view for interpreting the isotopic signature of alkyl porphyrins in
geological samples. Organic Geochemistry, 39, 521-531.
|
Shah, S. R., Mollenhauer, G., Ohkouchi, N., Eglinton, T. I., and Pearson,
A. (2008) Origins of archaeal tetraether lipids in sediments: Insights from
radiocarbon analysis. Geochimica et Cosmochimica Acta, 72,
4577-4594.
|
Suzuki, Y., Chikaraishi, Y., Ogawa, N. O., Ohkouchi, N., and Korenaga, T.
(2008) Geographical origin of polished rice based on stable isotope analyses.
Food Chemistry, 109, 470-475.
|
| 2007 |
Chikaraishi, Y., Kashiyama, Y., Ogawa, N. O., Kitazato, H., and Ohkouchi,
N. (2007) Metabolic control of nitrogen isotopic composition of amino acids
in macroalgae and gastropods: implications for aquatic food web studies.
Marine Ecology Progress Series, 342, 85-90.
|
Chikaraishi, Y., Matsumoto, K., Kitazato, H., and Ohkouchi, N. (2007)
Sources and transformation processes of pheopigments: Stable carbon and hydrogen
isotopic evidence from Lake Haruna, Japan. Organic Geochemistry,
38, 985-1001.
|
Kashiyama, Y., Kitazato, H., and Ohkouchi, N. (2007) An improved method
for isolation and purification of sedimentary porphyrins by high-performance
liquid chromatography for compound-specific isotopic analysis. Journal of
Chromatography A, 1138, 73-83.
|
Kashiyama, Y., Shiro, M., Tada, R., and Ohkouchi, N. (2007) A novel
vanadyl alkylporphyrins from geological samples: a possible derivative of
divinylchlorophylls or bacteriochlorophyll a? Chemistry Letters,
36, 706-707.
|
Kuroda, J., Ogawa, N. O., Tanimizu, M., Coffin, M. F., Tokuyama, H., Kitazato,
H., and Ohkouchi, N. (2007) Contemporaneous massive subaerial volcanism
and late Cretaceous Oceanic Anoxic Event 2. Earth and Planetary Science
Letters, 256, 211-223.
|
| 2006 |
Kameo, K., Okada, M., El-Masry, M., Hisamitsu, T., Saito, S., Nakazato, H.,
Ohkouchi, N., Ikehara, M., Yasuda, H., Kitazato, H., and Taira, A. (2006)
Age model, physical properties and paleoceanographic implications of the middle
Pleistocene core sediments in the Choshi area, central Japan. Island Arc,
15, 366-377.
|
Kuroda, J. and Ohkouchi, N. (2006) Implications of spatiotemporal
distribution of black shales deposited during the Cretaceous Oceanic Anoxic
Event-2. Paleontological Research, 10, 345-358.
|
| Nomaki, H., Heinz, P., Nakatsuka, T., Shimanaga, M., Ohkouchi, N., Ogawa,
N. O., Kogure, K., Ikemoto, E., and Kitazato, H. (2006) Different ingestion
patterns of 13C-labeled bacteria and algae by deep-sea benthic
foraminifera. Marine Ecology Progress Series, 310, 95-108. |
Ohkouchi, N. and Eglinton, T. I. (2006) Radiocarbon constraint on relict
organic carbon contributions to Ross Sea sediments. Geophysics Geochemistry
Geosystems, 7, Q04012, doi:10.1029/2005GC001097.
|
Ohkouchi, N., Kashiyama, Y., Kuroda, J., Ogawa, N. O., and Kitazato, H.
(2006) The importance of diazotrophic cyanobacteria as primary producers during
Cretaceous Oceanic Anoxic Event 2. Biogeosciences, 3, 467-478.
|
Yokoyama, Y., Naruse, T., Ogawa, N. O., Tada, R., Kitazato, H., and Ohkouchi,
N. (2006) Dust influx reconstruction during the last 26,000 years inferred
from a sedimentary leaf wax record from Japan Sea. Global Planetary
Change, 54, 239-250.
|
| 2005 |
Chikaraishi, Y., Matsumoto, K., Ogawa, N. O., Suga, H., Kitazato, H., and
Ohkouchi, N. (2005) Hydrogen, carbon and nitrogen isotopic fractionations
during chlorophyll biosynthesis in C3 higher plants. Phytochemistry,
66, 911-920.
|
| Kuroda, J., Ohkouchi, N., Ishii, T., Tokuyama, H., and Taira, A. (2005)
Lamina-scale variations in sedimentary components in Cretaceous black shales by
chemical compositional mapping: Implications for paleoenvironmental changes
during Oceanic Anoxic Events. Geochimica et Cosmochimica Acta, 69,
1479-1494. |
Ohkouchi, N., Eglinton, T. I., Hughen, K., Roosen, E., Keigwin, L. D.
(2005) Radiocarbon dating of alkenones from marine sediments - III. Influence of
solvent extraction procedures on 14C measurements of foraminifera.
Radiocarbon, 47, 425-432.
|
Ohkouchi, N., Nakajima, Y., Okada, H., and Kitazato, H. (2005)
Copper-chelated bacteriochlorophyll e homologues in the sediments from anoxic
Lake Abashiri (Japan). Organic Geochemistry, 36, 1576-1580.
|
Ohkouchi, N., Nakajima, Y., Okada, H., Ogawa, N. O., Suga, H., Oguri, K.,
and Kitazato, H. (2005) Biogeochemical processes in the meromictic lake Kaiike:
Implications from carbon and nitrogen isotopic compositions of photosynthetic
pigments. Environmental Microbiology, 7, 1009-1016.
|
Ohkouchi, N., Xu, L., Reddy, C. M., Montlucon, D., and Eglinton, T. I.
(2005) Radiocarbon dating of alkenones from marine sediments - I. Isolation
protocol. Radiocarbon, 47, 401-412.
|
| 2004 |
Nakajima, Y., Shimizu, H., Ogawa, N. O., Sakamoto, T., Okada, H., Koba, K.,
Kitazato, H., and Ohkouchi, N. (2004) Vertical distributions of stable
isotopic compositions and bacteriochlorophyll homologues in suspended
particulate matter in saline meromictic Lake Abashiri. Limnology, 5,
185-189.
|
| 2003 |
Johnson, C. G., Frysinger, G. S., Nelson, R. K., Gaines, R. B., Ohkouchi,
N., Reddy, C., and Eglinton, T. I. (2003) Innovative methods for determining
alkenone unsaturation ratios. Marine Chemistry. 83, 5-22.
|
Mollenhauer, G., Eglinton, T. I., Ohkouchi, N., Schneider, R. R., Müller,
P. J., Grootes, P. M. and Rullkötter, J. (2003) Asynchronous alkenone and
foraminifera records from the Benguela Upwelling System. Geochimica et
Cosmochimica Acta, 67, 2157-2171.
|
Nakajima, Y., Okada, H., Oguri, K., Suga, H., Kitazato, H., Koizumi, Y., Fukui,
M., and
Ohkouchi, N. (2003) Distribution of chloropigments in
suspended particulate matter and benthic microbial mat of a meromictic lake,
Lake Kaiike, Japan. Environmental Microbiology, 5, 1103-1110.
|
| Ohkouchi, N., Eglinton, T. I., and Hayes, J. M. (2003) Radiocarbon dating
of individual fatty acids as a tool for refining Antarctic margin sediment
chronologies. Radiocarbon, 45, 17-24. |
| 2002 |
Ohkouchi, N., Eglinton, T. I., Keigwin, L. D., and Hayes, J. M. (2002)
Spatial and temporal offsets between proxy records in a sediment drift.
Science, 298, 1224-1227.
|
| Pagani, M., Freeman, K., Ohkouchi, N., and Caldeira, K. (2002) Comparison
of water column [CO2aq] with sedimentary alkenone-based estimates: A
test of the alkenone-CO2 proxy. Paleoceanography, 17, PA000756. |
| 2001 |
Ogawa, N. O., Koitabashi, T., Oda, H., Nakamura, T., Ohkouchi, N., and
Wada, E. (2001) Fluctuations of nitrogen isotope ratio of gobiid fish specimens
and sediments in Lake Biwa during the 20th century. Limnology and
Oceanography, 46, 1228-1236.
|
 |
Rosell-Mele, A., Bard, E., Emeis, K.-C., Grimalt, J. O., Muller, P., Schneider,
R., Bouloubassi, I., Epstein, B. Fahl, K., Fluegge, A., Freeman, K., Goni, M.,
Guntner, U., Hartz, D., Hellebust, S., Herbert, T., Ikehara, M., Ishiwatari, R.,
Kawamura, K., Kenig, F., de Leeuw, J., Hehman, S., Mejanelle, L., Ohkouchi,
N., Pancost, R. D., Pelejero, C., Prahl, F., Quinn, J., Rontani, J.-F.,
Rostek, F., Rullkotter, J., Sachs, J., Blanz, T., Sawada, K., Schults-Bull, D.,
Sikes, E., Sonzogni, C., Ternois, Y., Versteegh, G., Volkman, J. K., and
Wakeham, S. (2001) Precision of current methods to measure the alkenone proxy
UK37 and absolute alkenone abundance in sediments: Results of an interlaboratory
comparison study. Geochemistry, Geophysics, Geosystems, 2, Paper
number 2000GC000141.
|
|
| Ternois, Y., Kawamura, K., Keigwin, L. D., Ohkouchi, N., and Nakatsuka,
T. (2001) A biomarker approach for assessing marine and terrigenous inputs to
the Okhotsk Sea for the last 30,000 years. Geochimica et Cosmochimica
Acta, 65, 791-802. |
| 2000 |
Ikehara, M., Kawamura, K., Ohkouchi, N., Murayama, M., Nakamura, T., and
Taira, A. (2000) Variations of terrestrial input and marine productivity in the
Southern Ocean (48°S) during the last two deglaciations.
Paleoceanography, 15, 170-180.
|
Ohkouchi, N., Takemoto, N., Ikehara, M., Kawamura, K., and Nakatsuka, T.
(2000) Implications of carbon isotopic ratios of C31 alkane and
C37 alkenes for the sources of organic matter in the Southern Ocean
surface sediments. Geophysical Research Letters, 27, 233-236.
|
Prahl, F., Herbert, T., Brassell, S. C., Ohkouchi, N., Pagani, M.,
Rosell-Mele, A., Repeta, D., and Sikes, E. (2000) Status of alkenone
paleothermometer calibration: Report from Working group 3. Geochemistry,
Geophysics, Geosystems, 1, Paper number 2000GC000058.
|
Ternois, Y., Kawamura, K., Ohkouchi, N., and Keigwin, L. D. (2000)
Alkenone sea surface temperature in the Okhotsk Sea for the last 15 kyr.
Geochemical Journal, 34, 283-293.
|
| 1999～ |
Ikehara, M., Kawamura, K., Ohkouchi, N., and Taira, A. (1999) Organic
geochemistry of greenish clay and organic-rich sediments since early Miocene
from Hole 985A, Norway Basin. Proceedings of Ocean Drilling Program
Scientific Results, 162, 209-216.
|
Ohkouchi, N., Kawamura, K., and Kawahata, H. (1999) Distributions of 3-
to 7-ring parent and alkylated polycyclic aromatic hydrocarbons on the deep sea
floor in the Central Pacific. Environmental Science and Technology,
33, 3086-3090.
|
| Ohkouchi, N., Kawamura, K., Kawahata, H., and Okada, H. (1999) Depth
ranges of alkenone production in the Central Pacific Ocean. Global
Biogeochemical Cycles, 13, 695-704. |
Ohkouchi, N., Kawamura, K., Kajiwara, Y., Wada, E., Okada, M., Kanamatsu,
T., and Taira, A. (1999) Sulfur isotope records around Livello Bonarelli
(northern Apennines, Italy) black shale at Cenomanian-Turonian boundary.
Geology, 27, 535-538.
|
Ikehara, M., Kawamura, K., Ohkouchi, N., Kimoto, K., Oba, T., and Taira,
A. (1997) Alkenone sea surface temperature in the Southern Ocean for the last
two deglaciations. Geophysical Research Letters, 24, 679-682.
|
| Ohkouchi, N., Kawamura, K., Kawahata, H., and Taira, A. (1997)
Latitudinal distributions of terrestrial biomarkers in the Central Pacific.
Geochimica et Cosmochimica Acta, 61, 1911-1918. |
| Ohkouchi, N., Kawamura, K., and Taira, A. (1997) Fluctuations of marine
and terrestrial biomarkers in the western tropical Pacific during the last
23,300 years. Paleoceanography, 12, 623-630. |
Ohkouchi, N., Kawamura, K., and Taira, A. (1997) High abundances of
hopanols and hopanoic acids in Cretaceous black shales. Ancient
Biomolecules, 1, 183-192.
|
Ohkouchi, N., Kawamura, K., and Taira, A. (1997) Molecular
paleoclimatology: Reconstruction of climate change in the late Quaternary.
Organic Geochemistry , 27, 173-183.
|
Ohkouchi, N. and Wada, E. (1997) Secular variations of sedimentary
organic δ13C during the last 35 Ma in the tropical Atlantic, Site
925. Proceedings of Ocean Drilling Program Scientific Results,
154, 501-505.
|
Ohkouchi, N., Kawahata, H., Okada, M., Murayama, M., Nakamura, T., and
Taira, A. (1995) Benthic foraminifera cadmium record from the western equatorial
Pacific. Marine Geology, 127, 167-180.
|
Ohkouchi, N., Kawamura, K., Kawahata, H., and Taira, A. (1995) Organic
geochemistry of deep sea sediments: how it contributes to paleoceanography.
in Global Fluxes of Carbon and Its Related Substances in the Coastal
Sea-Ocean-Atmosphere System, pp. 533-538.
|
Ohkouchi, N., Kawahata, H., Murayama, M., Okada, M., Nakamura, T., and
Taira, A. (1994) Was deep water formed in the North Pacific during the late
Quaternary?: cadmium evidence from the northwest Pacific. Earth and Planetary
Science Letters, 124, 185-194.
|
Ohkouchi, N., Kawamura, K., Nakamura, T., and Taira, A. (1994) Small
changes in the sea surface temperature during the last 20,000 years: Molecular
evidence from the western tropical Pacific. Geophysical Research Letters,
20, 2207-2210.
|
|
 |
Bickle, M., Arculus,
R., Barrett, P., DeConto, R., Camoin, G.,
Edwards, K., Fisher,
F., Inagaki, F.,Kodaira, S., Ohkouchi, N., Pälike,
H., Ravelo, C., Saffer, D., and Teagle,
D. (2011) Illuminating Earth’s Past, Present and Future. The
International Ocean Discovery Program, Science Plan for 2013-2023, 84 p.
|
| Chikaraishi, Y., Ogawa, N. O., and Ohkouchi, N. (2010) Further evaluation
of trophic level estimation based on nitrogen isotopic composition of amino
acids. in Earth, Life, and Isotopes (Eds. Ohkouchi N, Tayasu I, Koba K),
Kyoto University Press, p. 37-51. |
Chikaraishi, Y. and Ohkouchi, N. (2010) An improved method for precise
determination of carbon isotopic composition of amino acids. in Earth, Life,
and Isotopes (Eds. Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, p.
355-366.
|
Chikaraishi, Y., Takano, Y., Ogawa, N. O., and Ohkouchi, N. (2010)
Instrument optimization for compound-specific nitrogen isotope analysis of amino
acids by gas chromatography/combustion/isotope ratio mass spectrometry. in
Earth, Life, and Isotopes (Eds. Ohkouchi N, Tayasu I, Koba K), Kyoto
University Press, p. 367-386.
|
| Kashiyama, Y., Ogawa, N. O., Kitazato, H., and Ohkouchi, N. (2010)
Nitrogen and carbon isotopic compositions of copper, nickel, and vanadyl
porphyrins in Cretaceous OAE black shales. in Earth, Life, and Isotopes
(Eds. Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, p. 313-335. |
| Nomaki, H., Ogawa, N. O., Ohkouchi, N., Toyofuku, T., and Kitazato, H.
(2010) The role of meiofauna in deep-sea benthic food-webs revealed by carbon
and nitrogen isotope analyses. in Earth, Life, and Isotopes (Eds.
Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, p. 119-138. |
| Ogawa, N. O., Nagata, T., Kitazato, H., and Ohkouchi, N. (2010)
Ultra-sensitive elemental analyzer/isotope ratio mass spectrometer for stable
nitrogen and carbon isotopic analyses. in Earth, Life, and Isotopes (Eds.
Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, p. 339-353. |
Ohkouchi, N., Chikaraishi, Y., Kashiyama, Y., and Ogawa, N. O. (2010)
Isotopomers of chlorophyll nuclei: Theories and an application. in Earth,
Life, and Isotopes (Eds. Ohkouchi N, Tayasu I, Koba K), Kyoto University
Press, p. 271-290.
|
Ohkouchi, N., Tayasu, I., and Koba, K. (eds.) (2010) Earth, Life, and
Isotopes. Kyoto University Press.
|
| Takano, Y., Chikaraishi, Y., Ohkouchi, N. (2010) Enantiomer-specific
isotope analysis of D- and L-alanine: Nitrogen isotopic hetero- and homogeneity
in microbial and chemical processes. in Earth, Life, and Isotopes (Eds.
Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, p. 387-402. |
Ogawa, N. O., Sato, R., and Ohkouchi, N. (2006) Evaluation of precision
and accuracy for carbon isotopic measurements of 13C-labeled samples
by an on line elemental analyzer / isotope ratio mass spectrometer system.
Frontier Research on Earth Evolution, 2.
|
Ohkouchi, N., Nakajima, Y., Ogawa, N. O., Suga, H., Kashiyama, Y.,
Matsumoto, K., Chikaraishi, Y., Oguri, K., and Kitazato, H. (2006) Stable carbon
and nitrogen isotopic compositions of photosynthetic pigments as tracers for
elemental cycle in the modern- and paleo-environments. Frontier Research on
Earth Evolution, 2.
|
Ohkouchi, N., Yanagisawa, T., Kuroda, J., Yamagishi, Y., Hamano, Y.,
Tanimizu, M., Ogawa, N. O., Suganuma, Y., and Yoshihara, A. (2006) A status
report of MUD “Global Event” group: A dynamic interaction between Earth’s
interior and surface environments in the mid Cretaceous. Frontier Research on
Earth Evolution, 2.
|
Ohkouchi, N., Kuroda, J., Okada, M., and Tokuyama, H. (2003) Why
Cretaceous black shales have high C/N ratios? Implications from SEM-EDX
observations for Livello Bonarelli black shales at Cenomanian-Turonian boundary.
Frontier Research on Earth Evolution, 1, 239-241.
|
Kajiwara, Y., Kaiho, K., and Ohkouchi, N. (1997) An invitation to the
sulfur isotope study of marine sediments: implications and constraints for the
exogenic sulfur cycle. Annual Report of Institute of Geoscience, University
of Tsukuba, 23, 69-74.
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| *Japanese articles are not listed on this page. |
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