巻号一覧
37 巻 (2010)
- 5 号 p. 183-
- 4 号 p. 137-
- 3 号 p. 95-
- 2 号 p. 57-
- 1 号 p. 1-
37 巻, 5 号
選択された号の論文の5件中1～5を表示しています
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巻頭言
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田中 晶善2010 年 37 巻 5 号 p. 183-185
発行日: 2010/11/30
公開日: 2022/11/20
ジャーナル フリーPDF形式でダウンロード (777K)
論文
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Akiyo K. Sakamiya, Natsuki Origuchi, Akiyoshi Tanaka2010 年 37 巻 5 号 p. 186-190
発行日: 2010/11/30
公開日: 2022/11/20
ジャーナル フリーStressing effects of the pesticide 2,4-dichlorophenoxyacetic acid (2,4-D) on soil-microbial activity were analyzed by a calorimetric method. Thirty-six mg glucose was added to 10 g of upland, orchard, paddy, sand-dune, natural-forest, and cedar-forest soils, respectively, in the presence of various concentrations of 2,4-D, and the evolved heat due to the glucose degradation was recorded at 25 ºC. The heat-evolution curves were analyzed on the basis of Richards growth model to evaluate several parameters that characterize the process of glucose degradation. The apparent degree of resistance of the soil microbes to 2,4-D was estimated from the 50 % stressing concentration Ki and the minimum inhibitory concentration MIC, which were evaluated by analyzing the 2,4-D-concentration-dependence of the degradation parameters. It was shown that the degree of resistance of the two kinds of forest soils were of an order of magnitude greater than that of the sand-dune soil in terms of the value of Ki. These stressing parameters, Ki and MIC, are valid measures for quantitative estimation of the stressing effects of pesticides on soil microbial activity.抄録全体を表示PDF形式でダウンロード (622K)
解説
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澤口 直哉, 河村 雄行2010 年 37 巻 5 号 p. 191-197
発行日: 2010/11/30
公開日: 2022/11/20
ジャーナル フリーMolecular dynamics method has been applied to investigate structures and thermodynamics of oxide melts and glasses. The characteristic structures of silicate and borate melts are overviewed, and several methods to simulate the melts and glasses are taken up and the simulated mixing enthalpy of acidic- and basic- oxide melts is discussed.抄録全体を表示PDF形式でダウンロード (1227K) -
吉場 一真, 寺本 明夫, 宮崎 裕司, 佐藤 尚弘2010 年 37 巻 5 号 p. 198-205
発行日: 2010/11/30
公開日: 2022/11/20
ジャーナル フリーA triple helical polysaccharide, schizophyllan, undergoes an order-disorder transition which is concerned with the side chain glucose residues and water molecules in aqueous solution. The order-disorder transition exhibits a strong molecular weight dependence, indicating a highly cooperative conformational change of side-chain glucose residues, and it was treated in terms of a linear cooperative theory originally proposed for the helix-coil transition of polypeptides. From concentration dependences of the transition temperature and the transition enthalpy, we divided the solvated water around the triple helix into four layers from of loosely structured water to of strongly bound water. The order-disorder transition of the schizophyllan triple helix is also reflected on characteristic temperature dependences of the dielectric dispersion and the cholesteric pitch of aqueous solutions of schizophyllan. The dielectric dispersion data demonstrated increase of free water and decrease of structured water at the transition from the order state to the disorder state. Abrupt change of the cholesteric pitch with temperature corresponds to the change of the side chain conformation and solvated water structure during the order-disorder transition.抄録全体を表示PDF形式でダウンロード (1581K)
フロギストン
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2010 年 37 巻 5 号 p. 206
発行日: 2010/11/30
公開日: 2022/11/20
ジャーナル フリーPDF形式でダウンロード (675K)
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