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JAEA Reports

Study of corrosion and degradation of the objects in the nuclear reactor by microorganisms (Contract research); FY2019 Nuclear Energy Science & Technology and Human Resource Development Project

Collaborative Laboratories for Advanced Decommissioning Science; Keio University*

JAEA-Review 2020-047, 63 Pages, 2021/01


JAEA/CLADS had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project in FY2019. Among the adopted proposals in FY2019, this report summarizes the research results of the "Study of corrosion and degradation of the objects in the nuclear reactor by microorganisms" conducted in FY2019.

Journal Articles

Sorption behavior of Np(V) on microbe pure culture and consortia

Onuki, Toshihiko; Kozai, Naofumi; Sakamoto, Fuminori; Utsunomiya, Satoshi*; Kato, Kenji*

Chemistry Letters, 46(5), p.771 - 774, 2017/05

 Times Cited Count:0 Percentile:0(Chemistry, Multidisciplinary)

The sorption behavior of Np(V) by the microbe consortia and by a single pure culture of Fe reducing bacterium was studied at pH between 3 and 7 in resting cell conditions. The sorption of Np(V) by the Fe reducing bacterium obtained in the inert condition and by the consortia in aerated condition were higher than by the Fe reducing bacterium in aerobic condition at pH below 5, strongly suggesting presence of other mechanism than the adsorption on microbial cell surface, i.e. reduction to Np(IV).

Journal Articles

Degradation of Eu(III)-malic acid complexes by $$Pseudomonas fluorescens$$

Nankawa, Takuya; Suzuki, Yoshinori*; Ozaki, Takuo; Onuki, Toshihiko; Francis, A. J.*

Journal of Alloys and Compounds, 408-412, p.1329 - 1333, 2006/02

 Times Cited Count:2 Percentile:23.4(Chemistry, Physical)

We studied the biodegradation of Eu(III)-malic acid complexes by $$Pseudomonas fluorescens$$. Ten milimolar Malic acid was degraded in the absence and in the presence of Eu(III) of 0.05, 0.1, and 0.2 mM. The degradation rate of malic acid increased with decreasing the ratios of Eu(III) to malic acid. These results suggest that the toxicity of Eu(III) can be masked through its complexation with malic acid. The degradation of malic acid was followed by the production of unidentified metabolites which were associated with Eu(III). One of the unidentified organic acids was analysed to be pyruvic acid. Our findings suggest that metabolites can influence the environmental behavior of Eu(III) by biologically transformed through subsequent complexation with Eu(III).

JAEA Reports

Proceedings of the Takasaki Symposium on Radiation Application of Natural Polymers in Asia; October 1 and 2, 2001, JAERI, Takasaki, Japan

Functional Materials Laboratory I

JAERI-Conf 2002-003, 225 Pages, 2002/03


This Takasaki symposium was held annually for radiation processing of natural polymers through research cooperation among Asian countries. The symposium includes the presentations of research outcomes on radiation processing of starches, silk proteins and marine carbohydrates. In starch and cellulose researches, radiation crosslinking of biodegradable polysaccharides was achieved by modifying it to be water-soluble paste. In silk protein researches, pulverization and water-solubilization of the irradiated silk proteins were reported. In marine carbohydrate researches, it was reported that radiation-degraded chitosan and alginate showed promotion effects for plant growth and enhancement of antibacterial properties. In addition, estimation of economic scale of radiation application in Japan and U.S. were introduced. Outcomes of this symposium should contribute the progress in radiation applications in south Asian and Japan. We had the 63 participants consisted of 16 foreign researchers and 60 from domestic organizations. This proceeding compiles the invited and contributed papers.

Journal Articles

Composition range of crystal phase transition of Isodimorphism in poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

Mitomo, Hiroshi*; Morishita, Norio; *

Macromolecules, 26(21), p.5809 - 5811, 1993/00

 Times Cited Count:71 Percentile:96.11(Polymer Science)

no abstracts in English

Journal Articles

Lysis of radio-resistant bacteria by enzyme of achromobacter lunatus

; ; *; *

Agricultural and Biological Chemistry, 40(2), p.427 - 429, 1976/02

no abstracts in English

Journal Articles

Free radical concentration in irradiated bacterial spores

; Franklin Hutchinson*

Biochimica et Biophysica Acta, 95, p.690 - 692, 1965/00

no abstracts in English

Oral presentation

Biotransformation of plutonium

Onuki, Toshihiko; Francis, A. J.*

no journal, , 

We have studied the interaction of Pu with microorganisms. Pu as Pu(6) is preferably sorbed to bacterial cells in the mixture of Bacillus subtilis and kaolinite, and that Pu(6) is reduced to Pu(5) and then to Pu(4) during the interaction with the mixture. Study on reduction of Pu(4) in the presence of citric acid at pH 7.0 suggested that Pu(4) is reduced to Pu(3) by the activity of sulphate reducing bacteria. These facts indicate that microorganisms change chemical states of Pu during migration in environments.

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