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Journal Articles

Microbially formed Mn(IV) oxide as a novel adsorbent for removal of Radium

Tanaka, Kazuya; Yamaji, Keiko*; Masuya, Hayato*; Tomita, Jumpei; Ozawa, Mayumi*; Yamasaki, Shinya*; Tokunaga, Kohei; Fukuyama, Kenjin*; Ohara, Yoshiyuki*; Maamoun, I.*; et al.

Chemosphere, 355, p.141837_1 - 141837_11, 2024/05

In this study, biogenic Mn(IV) oxide was applied to remove Ra from mine water collected from a U mill tailings pond in the Ningyo-toge center. Just 7.6 mg of biogenic Mn(IV) oxide removed more than 98% of the $$^{226}$$Ra from 3 L of mine water, corresponding to a distribution coefficient of 10$$^{7.4}$$ mL/g for Ra at pH 7. The obtained value was convincingly high for practical application of biogenic Mn(IV) oxide in water treatment.

Journal Articles

Fe, Mn and $$^{238}$$U accumulations in ${it Phragmites australis}$ naturally growing at the mill tailings pond; Iron plaque formation possibly related to root-endophytic bacteria producing siderophores

Nakamoto, Yukihiro*; Doyama, Kohei*; Haruma, Toshikatsu*; Lu, X.*; Tanaka, Kazuya; Kozai, Naofumi; Fukuyama, Kenjin; Fukushima, Shigeru; Ohara, Yoshiyuki; Yamaji, Keiko*

Minerals (Internet), 11(12), p.1337_1 - 1337_17, 2021/12

 Times Cited Count:1 Percentile:10.87(Geochemistry & Geophysics)

Mine drainage is a vital water problem in the mining industry worldwide because of the heavy metal elements and low pH. Rhizofiltration using wetland plants is an appropriate method to remove heavy metals from the water via accumulation in the rhizosphere. ${it Phragmites australis}$ is one of the candidate plants for this method because of metal accumulation, forming iron plaque around the roots. At the study site, which was the mill tailings pond in the Ningyo-toge uranium mine, ${it P. australis}$ has been naturally growing since 1998. The results showed that ${it P. australis}$ accumulated Fe, Mn, and $$^{238}$$U in the nodal roots without/with iron plaque compared with other plant tissues. Among the 837 bacterial colonies isolated from nodal roots, 88.6% showed siderophore production activities. Considering iron plaque formation around ${it P. australis}$ roots, we hypothesized that microbial siderophores might influence iron plaque formation because bacterial siderophores have catechol-like functional groups. The complex of catechol or other phenolics with Fe was precipitated due to the networks between Fe and phenolic derivatives. The experiment using bacterial products of root endophytes, such as ${it Pseudomonas}$ spp. and ${it Rhizobium}$ spp., showed precipitation with Fe ions, and we confirmed that several ${it Ps.}$ spp. and ${it R.}$ spp. produced unidentified phenolic compounds. In conclusion, root-endophytic bacteria such as ${it Pseudomonas}$ spp. and ${it R.}$ spp., isolated from metal-accumulating roots of ${it P. australis}$, might influence iron plaque formation as the metal accumulation site. Iron plaque formation is related to tolerance in ${it P. australis}$, and ${it Ps.}$ spp. and ${it R.}$ spp. might indirectly contribute to tolerance.

Journal Articles

Root endophytic bacteria of a $$^{137}$$Cs and Mn accumulator plant, ${{it Eleutherococcus sciadophylloides}}$, increase $$^{137}$$Cs and Mn desorption in the soil

Yamaji, Keiko*; Nagata, Satoshi*; Haruma, Toshikatsu*; Onuki, Toshihiko; Kozaki, Tamotsu*; Watanabe, Naoko*; Namba, Kenji*

Journal of Environmental Radioactivity, 153, p.112 - 119, 2016/03

 Times Cited Count:20 Percentile:54.68(Environmental Sciences)

Of the 463 strains that we isolated, 107 (23.1%) produced the siderophores. We found $$^{137}$$Cs and Mn desorption concomitant with Al and Fe desorption. These results suggest that root endophytes of $$^{137}$$Cs accumulator plant produce siderophores, resulting in the desorption of $$^{137}$$Cs from the contaminated soil collected at Fukushima, Japan.

JAEA Reports

Cost estimation for the geological disposal system of high level ratioactive wast, for 1988; The Development of cost integrating system

Maki, Yasuro*; Kitano, Koichi*; Inoue, Daiei*; Onuma, Hiroshi*; Komada, Hiroya*; Yamaji, Kenji*; Osumi, Takashi*; Tanaka, Hiroshi*; Imazu, Masanori*

JNC TJ1400 2005-005, 98 Pages, 1989/03

JNC-TJ1400-2005-005.pdf:2.98MB

no abstracts in English

Oral presentation

Water purification influence of aquatic plants naturally growing in the slag accumulation site, Ningyo-toge mine

Yamaji, Keiko*; Nakamoto, Yukihiro*; Haruma, Toshikatsu*; Doyama, Kohei*; Ohara, Yoshiyuki; Tanaka, Kazuya; Fukuyama, Kenjin; Fukushima, Shigeru

no journal, , 

no abstracts in English

Oral presentation

Elucidation of radionuclide ($$^{238}$$U) and heavy metal (Fe, Mn) accumulation mechanism in phragmites australis influenced by root endophytic bacteria

Nakamoto, Yukihiro*; Yamaji, Keiko*; Haruma, Toshikatsu*; Doyama, Kohei*; Ohara, Yoshiyuki; Tanaka, Kazuya; Fukuyama, Kenjin; Fukushima, Shigeru

no journal, , 

no abstracts in English

Oral presentation

Isolation of Mn-oxidizing fungi from mine water at Ningyo-toge mine and the culture characteristics

Yamaji, Keiko*; Ohara, Yoshiyuki; Fukuyama, Kenjin; Nagayasu, Takaaki; Haruma, Toshikatsu; Tanaka, Kazuya; Masuya, Hayato*; Habe, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

Microbial community analyses of mine water and inside the iron removal tank in Ningyo-touge mine

Habe, Hiroshi*; Inaba, Tomohiro*; Aoyagi, Tomo*; Aizawa, Hidenobu*; Sato, Yuya*; Hori, Tomoyuki*; Yamaji, Keiko*; Ohara, Yoshiyuki; Fukuyama, Kenjin; Cai, H.*; et al.

no journal, , 

no abstracts in English

Oral presentation

Relationship between vegetation and physical-chemical properties of surface horizon in Ningyo-toge mine

Jiang, X.*; Tamura, Kenji*; Asano, Maki*; Haruma, Toshikatsu; Takahashi, Junko*; Fukuyama, Kenjin; Yamaji, Keiko*

no journal, , 

no abstracts in English

Oral presentation

Micromorphological characteristics of soils under the abandoned fields of mines, Ningyo-toge, Japan

Jiang, Q.*; Tamura, Kenji*; Asano, Maki*; Fukuyama, Kenjin; Takahashi, Junko*; Yamaji, Keiko*

no journal, , 

In the former open-pit mining area of Ningyo-toge mine, ${it Miscanthus sinensis}$ is the dominant in its vegetation and the vegetation succession has been suspended for 2 decades. The present work was conducted to understand the soil micromorphological characteristics on this unusual area. We set two sampling sites (site A and site B) at the former open-pit mining area. Site A is in ${it Miscanthus sinensis}$ dominant vegetation, and site B is in ${it Cyperus microiria}$ dominant vegetation. Soil samples were taken from each horizon of the soil profiles for chemical analysis at the sites, and thin sections were obtained from the soil core samples (0-5 cm, 10-15 cm, 30-35 cm depth of site A and Site B, respectively). The BC horizon of site B has a lower Eh, which may be due to the less voids in the underlying soil, which results in seasonal accumulation of water. And the soil thin section observation showed that the 0-5cm of soil is in good structure, but the lower layer is not fully developed and forms a block structure. The content of the five forms of Fe and Mn are residual form $$>$$ oxide-bound form $$>$$ organic-bound form $$>$$ carbonate-bound form $$>$$ exchangeable form in this study site.

Oral presentation

Elucidation of uranium and heavy metal (Fe, Mn) accumulation mechanism in ${it Phragmites australis}$ influenced by root endophytic bacteria

Nakamoto, Yukihiro*; Yamaji, Keiko*; Haruma, Toshikatsu; Doyama, Kohei*; Ohara, Yoshiyuki; Fukuyama, Kenjin; Fukushima, Shigeru

no journal, , 

no abstracts in English

Oral presentation

Uranium adsorption and iron plaque formation on roots of ${it Phragmites australis}$

Haruma, Toshikatsu*; Doyama, Kohei*; Tanaka, Kazuya; Takahashi, Yoshio*; Fukuyama, Kenjin; Ohara, Yoshiyuki; Yamaji, Keiko*

no journal, , 

no abstracts in English

Oral presentation

Heavy metal accumulations in ${it Phragmites australis}$ growing at the ore-sedimentary site; Iron plaque formation possibly related to endophytic bacteria

Nakamoto, Yukihiro*; Doyama, Kohei*; Haruma, Toshikatsu*; Lu, X.*; Tanaka, Kazuya; Kozai, Naofumi; Fukuyama, Kenjin; Fukushima, Shigeru; Ohara, Yoshiyuki; Yamaji, Keiko*

no journal, , 

no abstracts in English

Oral presentation

Ra adsorption on biogenic Mn(IV) oxide

Tanaka, Kazuya; Yamaji, Keiko*; Masuya, Hayato*; Tomita, Jumpei; Ozawa, Mayumi; Fukuyama, Kenjin*; Ohara, Yoshiyuki*; Kozai, Naofumi

no journal, , 

no abstracts in English

Oral presentation

Heavy metal tolerance of ${it Phragmites australis}$ naturally growing at a sedimentation site in an uranium mine associated with endophytic bacteria

Haruma, Toshikatsu*; Yamaji, Keiko*; Nakamoto, Yukihiro*; Doyama, Kohei*; Takahashi, Yoshio*; Tanaka, Kazuya; Kozai, Naofumi; Fukuyama, Kenjin*

no journal, , 

no abstracts in English

Oral presentation

Macro and micromorphological characteristics of soils under the abandoned fields of mines, Ningyo-toge, Japan

Jiang, Q.*; Tamura, Kenji*; Asano, Maki*; Fukuyama, Kenjin*; Yamaji, Keiko*

no journal, , 

This study was conducted to understand the soil macro and micromorphological characteristics on the former open pit mining area of Ningyo-toge mine. The vegetation succession of the area has not progressed. Its dominant vegetation has been ${it Miscanthus}$. The conclusions of this study are follows. The BC horizon of Site B has a lower Eh, which may be due to the less voids in the underlying soil, which results in seasonal accumulation of water. The contents of Mn, Cd, Pb, and Co were higher than the average contents in Japanese soil, but they did not reach the level of pollution. The content of acid-soluble Fe was very low in the soil, Fe mainly is the form of residual and a part of reducible form in the study site. But, the content of Mn in acid-soluble form is high, and Mn has a greater impact on vegetation. In this study site, external human factors have a large influence, mixed with a large amount of black residue and wood chips. And the 0-5cm of soil is in good structure, but the soil in the lower layer is not fully developed and it is a block structure.

Oral presentation

Elucidation of heavy-metal tolerance mechanism in ${it Phragmites australis}$ (Cav.) Trin. ex Steud. without iron plaque formation

Okuma, Miyu*; Yamaji, Keiko*; Nakamoto, Yukihiro*; Fukuyama, Kenjin*; Tsunashima, Yasumichi

no journal, , 

At our study site, mill tailing pond, which is used as a temporary storage site to treat mine water containing iron, manganese, etc., ${it Phragmites australis}$ (Cav.) Trin. ex Steud. has been found to grow naturally there; therefore, this plant was considered to have some metal tolerance mechanisms. Actually, ${it P. australis}$ was previously reported to enhance heavy metal tolerance through the formation of iron plaques; however, few iron plaques were observed on roots of ${it P. australis}$ growing Fe deposition site close to the entrance of mine water at our study site, suggesting that they may have another heavy metal tolerance mechanisms. The objective of this study was to elucidate the heavy metal tolerance mechanisms of ${it P. australis}$, without iron plaque formation. Elemental analysis clarified that high concentrations of Fe, Al, and Zn were accumulated in healthy nodal roots; especially, excessive Fe accumulation was confirmed compared with normal plants. Detoxicant analysis in the roots indicated that phenolics and organic acids were not produced well to contribute to the tolerance. Due to the observation of sections of ${it P. australis}$ nodal roots stained with potassium ferrocyanide solution, Fe localization was observed in the epidermis and the cell walls of the outermost layers of the cortex cells. Since immobilization of heavy metals in the cell walls is known as one of the heavy metal tolerance mechanisms in plants, our results suggest that ${it P. australis}$ would show the tolerance to immobilize Fe in the cell walls to prevent from migrating into the interior cells.

17 (Records 1-17 displayed on this page)
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