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Journal Articles

Occurrence and potential activity of denitrifiers and methanogens in groundwater at 140 m depth in Pliocene diatomaceous mudstone of northern Japan

Katsuyama, Chie*; Nashimoto, Hiroaki*; Nagaosa, Kazuyo*; Ishibashi, Tomotaka*; Furuta, Kazuki*; Kinoshita, Takeshi*; Yoshikawa, Hideki; Aoki, Kazuhiro; Asano, Takahiro*; Sasaki, Yoshito; et al.

FEMS Microbiology Ecology, 86(3), p.532 - 543, 2013/12

 Times Cited Count:14 Percentile:36.94(Microbiology)

Anaerobic microbial activity has a major influence on the subsurface environment, and should be considered in subsurface activities including the construction of radioactive waste repositories. We investigated denitrification and methanogenesis in anoxic groundwater from 140 m depth in two boreholes, where the redox potential fluctuated. The average maximum potential denitrification rates, measured under anaerobic conditions in the two boreholes using an $$^{15}$$N tracer. Methanogenesis candidates were detected by 16S rRNA gene analysis. Although the stable isotope signatures suggested that some of the dissolved methane was of biogenic origin, no potential for methane production was evident during the incubations. The groundwater at 140 m depth did not contain oxygen, had an Eh ranging from -144 to 6.8 mV, and was found to be a potential field for denitrification.

Oral presentation

Quantification of microbial biomass in groundwater for safety assessment of geological disposal of nuclear waste

Asano, Takahiro; Sasaki, Yoshito; Nagaosa, Kazuyo*; Kato, Kenji*; Yoshikawa, Hideki

no journal, , 

no abstracts in English

Oral presentation

Temperature constraints methane production in subsurface environments of Horonobe, Hokkaido, Japan

Nagaosa, Kazuyo*; Asano, Takahiro; Sasaki, Yoshito; Yoshikawa, Hideki; Kato, Kenji*

no journal, , 

no abstracts in English

Oral presentation

Unveil the depth of microbial methane production in a sedimentary rock subsurface system

Kato, Kenji*; Nagaosa, Kazuyo*; Tsunogai, Urumu*; Asano, Takahiro; Sasaki, Yoshito; Yoshikawa, Hideki

no journal, , 

no abstracts in English

Oral presentation

Growth of deep subsurface microbes and their grazing loss

Ishibashi, Tomotaka*; Nagaosa, Kazuyo*; Katsuyama, Chie*; Nashimoto, Hiroaki*; Asano, Takahiro; Sasaki, Yoshito; Iwatsuki, Teruki; Yoshikawa, Hideki; Kato, Kenji*

no journal, , 

no abstracts in English

Oral presentation

Denitrification in groundwater at 140 m depth in sedimentary horizon

Katsuyama, Chie*; Nashimoto, Hiroaki*; Ishibashi, Tomotaka*; Furuta, Kazuki*; Nagaosa, Kazuyo*; Yoshikawa, Hideki; Asano, Takahiro; Sasaki, Yoshito; Aoki, Kazuhiro; Suwa, Yuichi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Possible depths for methanogenesis in deep subsurface environment of sedimentary geological setting

Nashimoto, Hiroaki*; Nagaosa, Kazuyo*; Katsuyama, Chie*; Tsunogai, Urumu*; Yoshikawa, Hideki; Asano, Takahiro; Sasaki, Yoshito; Aoki, Kazuhiro; Kato, Kenji*

no journal, , 

no abstracts in English

7 (Records 1-7 displayed on this page)
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