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論文

Dipole tracer migration and diffusion tests in fractured sedimentary rock at Horonobe URL

田中 真悟*; 横田 秀晴; 大野 宏和; 中山 雅; 藤田 朝雄; 瀧谷 啓晃*; 渡辺 直子*; 小崎 完*

Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 6 Pages, 2015/05

In-situ dipole tracer migration tests were conducted at the G.L.-250 m gallery of the Horonobe URL. Laboratory experiments were also conducted to determine the apparent diffusivity (${{it D$_{a}$}}$) and sorption coefficients (${{it K$_{d}$}}$) of cesium and water (HTO) in the rock taken at the gallery to evaluate the performance of Wakkanai formation as natural barrier. The breakthrough curves of non-sorbing tracer (Uranine) obtained at the in-situ dipole tracer migration tests were well described by a dual-channel model in which one-dimensional advection dispersion was taken in account. This suggests that the tracers migrate through at least two different pathways in the fracture. The breakthrough curves also indicated that the peak concentration of the sorbing tracer (cesium) was much smaller than that of the non-sorbing tracer (Uranine), suggesting that the Wakkanai Formation has a high sorptive and low diffusive properties for cesium. The ${{it D$_{a}$}}$ value obtained for cesium was about 3E-12 m$$^{2}$$/s, which is significantly smaller than that of water (3E-10 m$$^{2}$$/s), and the ${{it K$_{d}$}}$ value of cesium was determined to be about 5E-2 ml/g.

論文

Common reed accumulates starch in its stem by metabolic adaptation under Cd stress conditions

樋口 恭子*; 金井 雅武*; 土屋 将久*; 石井 春香*; 渋谷 尚史*; 藤田 直子*; 中村 保典*; 鈴井 伸郎; 藤巻 秀; 三輪 睿太郎*

Frontiers in Plant Science (Internet), 6, p.138_1 - 138_6, 2015/03

 被引用回数:13 パーセンタイル:57.96(Plant Sciences)

In a previous study, we reported that the common reed accumulates water-soluble Cd complexed with an $$alpha$$-glucan-like molecule, and that the synthesis of this molecule is induced in the stem of the common reed under Cd stress. We studied the metabolic background to ensure $$alpha$$-glucan accumulation under the Cd stress conditions that generally inhibit photosynthesis. We found that the common reed maintained an adequate CO$$_{2}$$ assimilation rate, tended to allocate more assimilated $$^{11}$$C to the stem, and accumulated starch granules in its stem under Cd stress conditions. AGPase activity, which is the rate-limiting enzyme for starch synthesis, increased in the stem of common reed grown in the presence of Cd. Starch accumulation in the stem of common reed was not obvious under other excess metal conditions. Common reed may preferentially allocate assimilated carbon as the carbon source for the formation of Cd and $$alpha$$-glucan complexes in its stem followed by prevention of Cd transfer to leaves acting as the photosynthetic organ. These responses may allow the common reed to grow even under severe Cd stress conditions.

口頭

若手図書館員のコミュニティ; Lifoについて

長屋 俊; 石道 尚子*; 末田 真樹子*; 藤田 方江*; 松村 悠子*

no journal, , 

研究や技術開発のみならず図書館の現場でも、機関あるいは担当者ベースによる連携や情報共有が価値を生みつつある。最近では検索エンジンとインターネットの情報源,電子書籍の台頭から、図書館員の専門性を問われることもあり、図書館員は館種や業種,機関を超えた連携が求められている。しかし、実際の図書館の現場では公共・大学・学校・専門などといった図書館の館種別、あるいは主題分野別のコミュニティが多い。また、その多くはタテ割でありベテランによる運営・参加が多く、若手が入っていきづらい雰囲気のところも多々ある。2007年12月に発足したLifoは若手図書館員のためのコミュニティであり、館種・主題分野は全く問わない。そして、代表者不在というタテ割ではない横のつながりを主軸にしたコミュニティである。Lifoが発足して2年半ほど経ち、全国に参加者が増え、若手図書館員ならではの交流などの事例が生まれつつある。発足当時からかかわってきた参加者の一人としてLifoにおける活動の事例報告を行う。

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