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User-recommended papers allows you to suggest a paper you would like to see on Nature China. When these papers appear on our site, users may comment and vote on them. To recommend a paper please use this form. Please note that you cannot recommend a paper you have authored. The editors will reject any self-recommendations. All comments and recommendation are checked by the editors and may be edited prior to publication on the site.

• Chemistry

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  • Pharmacokinetics of Isofraxidin in Rat Plasma after Oral Administration of the Extract of Acanthopanax senticosus Using HPLC with Solid Phase Extraction Method

    • Hui Sun, Haitao Lv, Yanmei Zhang, Xijun Wang, Kaishun Bi, Hongxin Cao
      Original article citation: Chemical and Pharmaceutical Bulletin 55," 1291 - 1295, (2007).

    • Categories: Chemistry, Clinical Medicine, and Developmental Biology
    • Recommended by : Linying Du on 09/12/2007 01:13PM GMT
      
      本文首次利用SPE-HPLC-UV法研究天然生物活性成分异秦皮啶不同形式给药后的大鼠体内的药动学行为的差异。研究结果表明，异秦皮啶单体口服给予大鼠后，仅在0.19 h表征一个强吸收峰，且体内延迟时间较短。而以刺五加标准提取物形式口服给予大鼠后，在0.31h和8.70h表征两个强吸收峰，且体内作用时间和生物利用度与单体给药相比显著提升，这或许归功于中药多成分之间的转化与协同作用。从而揭示中药给药形式的有效性和合理性，及中药作用持久的内在规律，也为中药活性的现代评价提供一个全新思路。 本文发表于日本的Chemical and Pharmaceutical Bulletin(SCI 收录)。全文见Chem. Pharm. Bull. 55(9) 1291—1295 (2007)
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  • Symmetry-mediated H_{2}O diffusion on Al{100}

    • Jibiao Li, Ying Li, Shenglong Zhu, Fuhui Wang
      Original article citation: Phys. Rev. B 74," (2006).

    • Categories: Physics, Materials, and Chemistry
    • Recommended by : yanbing tang on 06/28/2007 02:08AM GMT
      
      This paper provided insights into mechanisms of the elementary step of monomeric water motions, and enriched our knowledge of one-molecule science. The findings, of the orientational preferences and correlation for the atop-to-atop motions of an H2O on Al{100}, have widespread interests in research communities. The authors also provided theoretical evidence that the favored mechanisms can be classical hopping coupled with either the molecular flipping or in-plane reorientations, in contrast to the simple translational motions; while quantum tunneling assisted motion is not favored for an H2O via the nearest neighbor diffusion. The paper showed that the symmetry match between an H2O and the surface square lattice controlled molecular mechanisms of the surface motions.
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  • • 10+ votes

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  • Technique for Preparing Ultrafine Nanocrystalline Bulk Material of Pure Rare-Earth Metals

    • X. Song, J. Zhang, M. Yue, E. Li, H. Zeng, N. Lu, M. Zhou, T. Zuo
      Original article citation: Adv. Mater. 18," (2006).

    • Categories: Materials, Chemistry, and Physics
    • Recommended by : Baoquan Sun on 06/10/2007 03:22PM GMT
      
      Nowadays to prepare pure metal nanoparticles and pure nanocrystalline metal bulk materials is still very hard. Especially, to prepare pure rare-earth nanoparticles and nanocrystalline bulks is a big challenge in the field of nanoscience and nanotechnology. This paper proposed a novel technique to prepare ultra-fine nanocrystalline RE bulks with advanced properties. The essential importance is that the proposed route and techniques can be extended to prepare any nano-metallic materials that are active in the open air, thus it makes possible to study structures and properties of many metallic nanomaterials that could be hardly prepared before.
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  • Reversible, Erasable, and Rewritable Nanorecording on an H2 Rotaxane Thin Film

    • M. Feng, L. Gao, Z. Deng, W. Ji, X. Guo, S. Du, D. Shi, D. Zhang, D. Zhu, H. Gao
      Original article citation: J. Am. Chem. Soc. doi:10.1021/ja067037p

    • Categories: Materials, Chemistry, and Physics
    • Recommended by the Editor: Samia Mantoura on 02/12/2007 02:38PM GMT
      
      The authors of this paper have made a new organic thin film (H2 rotaxane) as a new recording medium. By applying a positive or negative voltage from a STM tip 'dots' can be written or erased. The authors show that these dots, visible using AFM, are the result of conductance transitions in the H2 rotaxane molecules.
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  • Ru-Catalyzed Asymmetric Hydrogenation of Racemic Aldehydes via Dynamic Kinetic Resolution: Efficient Synthesis of Optically Active Primary Alcohols

    • J.-H. Xie, Z.-T. Zhou, W.-L. Kong, Q.-L. Zhou
      Original article citation: J. Am. Chem. Soc. doi:10.1021/ja0680109

    • Categories: Chemistry
    • Recommended by the Editor: Samia Mantoura on 02/08/2007 01:46PM GMT
      
      Asymmetric hydrogenation of R-branched aldehydes still remains a challenge to chemists. The products of this - chiral alcohols - would be of use industrially and in academia for a wide range of applications. The authors of this paper have used a catalyst previously developed by themselves - [RuCl2(SDPs)(diamine)] ? to obtain a single alcohol enantiomer by dynamic kinetic resolution.
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  • High precision measurements of Mg/Ca and Sr/Ca ratios in carbonates by cold plasma inductively coupled plasma quadrupole mass spectrometry

    • C SHEN, H CHIU, H CHIANG, M CHU, K WEI, S STEINKE, M CHEN, Y LIN, L LO
      Original article citation: Chemical Geology 236," 339 - 349, (2007).

    • Categories: Earth & Environment and Chemistry
    • Recommended by the Editor: Samia Mantoura on 02/08/2007 01:44PM GMT
      
      Mg/Ca and Sr/Ca ratios in foraminiferal carbonates are regularly used by marine geochemists to reconstruct past ocean temperature. The authors of this paper present a new analytical method for the measurement of the trace levels of these elements by ICP-QMS. Previous problems such as interferences from 86Sr have been addressed and furthermore the method uses small amounts of sample - an important achievement given the laborious hand picking of microscopic foraminifera samples. Modern temperatures calculated from foraminiferal Mg/Ca from the South China Sea are close to those measured instrumentally. Analysis of glacial and interglacial foraminifera yields a sea surface temperature change of 3 degrees C.
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  • Crystal structure of mitochondrial respiratory membrane protein complex II

    • F Sun, X Huo, Y Zhai, A Wang, J Xu, D Su, M Bartlam, Z Rao
      Original article citation: Cell 121," 1043 - 1057, (2005).

    • Categories: Cell & Molecular Biology, Genetics, Chemistry, and Clinical Medicine
    • Recommended by the Editor: Samia Mantoura on 02/08/2007 01:33PM GMT
      
      This paper reports the remarkable achievement of solving the crystal structure of complex II of the mitochondrial respiratory chain, and provides the structural framework for better understanding of the mitochondrial respiratory system and human mitochondrial diseases related to mutations in this complex.
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  • Positive and Negative TiO2 Micropatterns on Organic Polymer Substrates

    • P. Yang, M. Yang, S. Zou, J. Xie, W. Yang
      Original article citation: J. Am. Chem. Soc. doi:10.1021/ja063716o

    • Categories: Chemistry and Materials
    • Recommended by the Editor: Samia Mantoura on 01/31/2007 08:09PM GMT
      
      Titanium dioxide thin films are technologically useful materials with applications in photo-catalysis and energy conversion. However, most methods to make these have involved molecular self-assembly on to surfaces. The authors of this paper present a new liquid phase deposition method that is simple, fast and low-cost.
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