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| 1 | 趋磁细菌纳米磁小体的研究与应用显示文摘趋磁细菌是一类能够沿着磁场方向运动的细菌,其共同特征是能在细胞内形成有生物膜包裹的纳米级单畴磁性晶体颗粒——磁小体。磁小体的主要化学成分是磁铁矿Fe3O4,与人工合成的磁性纳米晶体相比具有化学纯度高、粒度细而均一以及生物相容性好等优点,作为新一代纳米磁性材料,在生物化学、磁性材料、临床医药和废水处理等许多领域具有巨大的潜在应用价值。磁小体在细胞内的形成过程受到严格的生物化学机制的控制,包括铁离子的吸收、磁小体膜的形成、铁离子的转运及膜内受控的Fe3O4的生物矿化四个步骤。本文从趋磁细菌细胞内磁小体的化学组成和结构,细胞内磁小体的合成条件和生化反应机制,磁小体的磁学性质、分离纯化方法以及纳米磁小体的应用等方面综述了相关的研究进展,提出了磁小体合成机理及实践应用中尚待解决的问题,展望了未来研究磁小体及其应用的发展方向。 | 潘宇 历娜 周润宏 赵敏 | 2013 | 化学进展2013，25，10： | 2 |
| 2 | 股市与经济增长协调发展的对策研究 | 李珅蓉 | 2012 | 现代经济信息2012，0，03X： | 0 |
| 3 | Analysis of existing agroforestry practices in Madhupur Sal forest: an assessment based on ecological and economic perspectives显示文摘A study was conducted in Madhupur sal forest of Tangail, Bangladesh to identify the suitable agroforestry practices of the area. Considering the ecological aspects of different agroforestry practices 10 sample plots (10 m × 10 m) from each land uses were taken, including natural forest to get a comparative scenario. The study showed that among the different agroforestry practices, Margalef and Shannon- Weiner index values are the maximum for pineapple agroforestry and lower for banana agroforestry, and Evenness index value is the maximum for lemon agroforestry. Determination of tree biomass in different land uses revealed that it is highest (3 078.6 kg/100 m 2 ) in natural forest fol- lowed by pineapple agroforestry, lemon agroforestry and banana agro- forestry. Soil pH, moisture content, organic matter, organic carbon, phos- phorus and total nitrogen showed statistically significant variation while bulk density, particle density, sulphur and potassium did not show any statistically significant variation among the land uses. Soil fertility status showed that pineapple agroforestry is more fertile than rest of other land uses. The Net Present Value (NPV) indicated that banana agroforestry is financially more profitable than other two systems, while the Benefit- Cost ratio (BCR) is higher in pineapple agroforestry (4.21 in participa- tory agroforestry and 3.35 in privately managed land). Even though ba- nana agroforestry gives higher NPV, capital required for this practice is much higher. The findings suggest that pineapple agroforestry has a tendency towards becoming ecologically and economically more sound than other two practices as it has better ecological attributes and required comparatively low investment. | Mohammad Golam Kibria Narayan Saha | 2011 | Journal of Forestry Research2011，22，4： | 0 |
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