Determination of Carnitine in Serum by HPLC

目的建立血浆中游离肉碱的测定方法。方法用高效液相色谱（HPLC）测定各患者的血浆游离肉碱，并进行比较。结果方法线性范围为2～32μg·mL^-1；最低检测浓度为2μg·mL^-1，总分析时间为9．248min。内碱的平均保留时间（8．467±O．042）min。高、中、低3种浓度的平均回收率为98．7％。批内批间RSD分别为4．8％和10．9％（n=5）。结论HPLC法测定血浆游离肉碱浓度灵敏、可靠、简便，适用于快速检测肉碱缺乏症病人的临床筛选工作。OBJECTIVE To establish a method for the determination of the concentration of carnitine in serum by HPLC. METHODS Determinate free plasma carnitine by HPLC method for each patient and run a comparison between them. RESULTS The linear range in this method was 2 -32μg · mL^-1 ;the Minimum detection concentra- tion was 2g · mL^-1 and total analysis time for 9. 248min. Also, Carnitine average retention time was 8. 467min （plus or minus 0. 042）. High,medium and low concentration of three kinds of the average recovery was 98.7%. Batch in- side batch respectively between RSD was 4. 8% and 10. 9% （ n = 5 ）. CONCLUSION The determination of the concentration of carnitine in serum by HPLC will be sensitive, reliable and convenient, and it will be applicable to the rapid detection for clinical screening work of patients with carnitine deficiency

Combustion Synthesis and Electrochemical Properties of the Small Hydrofullerene C50H10

通讯作者地址: Xie, SY (通讯作者),Xiamen Univ, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 2. Xiamen Univ, Coll Chem & Chem Engn, Dept Chem, Xiamen 361005, Peoples R China 3. Xiamen Univ, Sch Life Sci, Xiamen 361005, Peoples R China 电子邮件地址: [email protected]; [email protected] hydrofullerene C50H10 is synthesized by low-pressure benzeneoxygen diffusion combustion. The structure of C50H10 is identified through NMR, mass spectrometry, and IR and Raman spectroscopy as a D5h symmetric closed-cage molecule with five pairs of fused pentagons stabilized by ten hydrogen atoms. UV/Vis and fluorescence spectrometric analyses disclose its optical properties as comparable with those of its chloride cousin (C50Cl10). Cyclic and square-wave voltammograms reveal that the first reduction potential of C50H10 is more negative than that of C50Cl10 as well as C60, with implications for the utilization of C50H10 as a promising electron acceptor for photovoltaic applications.973 projects 2011CB935901 NSFC 21031004 21021061 2077310

Simple Combustion Production and Characterization of Octahydro[60]fullerene with a Non-IPR C-60 Cage

1. Xiamen Univ, State Key Lab Phys Chem Solid Surface, Xiamen 361005, Peoples R China 2. Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 3. Xiamen Univ, Sch Life Sci, Xiamen 361005, Peoples R ChinaFor the first time an easier, operable combustion method is employed for the synthesis of non-IPR fullerene, and an octahydro[60)fullerene with a non-IPA C-60 cage (C-60 isomer C-#1809(60)) produced by combustion is isolated and characterized by MS, UV vis, IR, and NMR spectroscopies in combination with DFT calculations. This finding shows that, in addition to chlorine, hydrogen can be an ample cataloreactant for the production of non-IPR fullerene derivatives under such conditions as arc-burning and diffusion combustion.NSFC 20525103 20673088 20973137 20721001 20423002 21031004 973 projects 2007CB815301 2007CB81530

未成年人社区矫正实施中的问题与思考——以福州、厦门为例

社区矫正是与监禁矫正相对的、促进罪犯顺利回归社会的刑罚执行方式。未成年人犯罪是日趋严重的热点问题，在社区矫正实施过程中理应关注未成年犯的动态。通过对未成年人社区矫正实施中存在的问题及其原因进行剖析，借鉴中外优秀经验，思考和探讨优化未成年人社区矫正的措施，有助于加强和完善未成年人社区矫正制度

BaFi:Eu（2＋）中的新型色心及其复合发光

中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)增刊631

The Application of Fingerprint Identification in the New Type Student Status Information Management System

学籍信息管理是学校教务管理的重要内容,伴随着计算机技术尤其是数据库技术和网络技术的发展,学籍信息管理系统应运而生,并且得到快速发展和应用.当前学籍信息管理系统一般都集中于学籍静态信息的管理,例如学生基本信息,异动信息等,而对于一些动态信息的管理,例如学生学期注册或上课签到等,由于无法提供这些动态信息的有效性和真实性识别能力,目前还是采用传统的书面签字方法.为此,结合厦门大学新型教务管理系统的开发,采用指纹识别技术,构建了针对学籍信息管理系统模块的远程签到系统.引入指纹考勤功能模块后,可以有效地避免代签等问题,对于保证出勤率和教学质量具有积极意义.Based on the complexity and variety of student status information and the dramatic increase in the number of students and the function & performance deficiency of Xiamen University′s old student status information management system,this article discusses the design and development of new student status management system which meets the needs of current teaching reform.It also shows the major work which the author had done during the design and development of this new system.New student status management system supports more complex modules.The innovations in this paper include:the specific functions are separated from common functions;real-time synchronization of students′ status;function of setting up photos;variable field of modifying the authorities;function of signing in with fingerprint identification.国家863计划项目(2006AA01Z129);国家重点基础研究发展计划(973计划)(2007CB311005);厦门大学985二期信息创新平台项

Development of Mobile Phone Dependence Inventory for College Students

目的:本研究旨在编制适合大学生的手机依赖量表,并对其信效度进行检验。方法:根据DSM-IV和相关资料中对物质依赖和行为成瘾等的描述,通过个案访谈和前测,编制大学生手机依赖量表的条目。将量表在随机选取的北京300名大学生中进行施测,并通过比较依赖得分高低两组的人格(EPQ)和社会状况(自编问卷)差异,以检验量表的效度。结果:量表内部一致性系数达到0.50。依赖得分高低两组在神经质(P<0.01)、掩饰(P<0.05)、适应感(P<0.05)、价值观(P<0.01)等方面存在着显著差异。结论:手机依赖量表对大学生中的手机依赖者具有一定的辨别力,手机依赖者在人格和社会状况方面有其独特性

Chemical inhomogeneity inhibits grain boundary fracture: A comparative study in CrCoNi medium entropy alloy

Grain boundary (GB) fracture is arguably one of the most important reasons for the catastrophic failure of ductile polycrystalline materials. It is of interest to explore the role of chemical distribution on GB defor mation and fracture, as GB segregation becomes a key strategy for tailoring GB properties. Here we report that the inhomogeneous chemical distribution effectively inhibits GB fracture in a model CoCrNi medium entropy alloy compared to a so called 'average atom' sample. Atomic deformation kinematics combined with electronic behavior analysis reveals that the strong charge redistribution ability in chemical disor dered CrCoNi GBs enhances shear deformation and thus prevents GB crack formation and propagation. Inspects on the GBs with different chemical components and chemical distributions suggest that not only disordered chemical distribution but also sufficient harmonic elements with large electronic flexibility contribute to improving the GB fracture resistance. This study provides new insight into the influence mechanism of GB chemistry on fracture behavior, and yields a systematic strategy and criterion, from the atoms and electrons level, forward in the design of high performance materials with enhanced GB fracture resistance.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology

Impact tension behavior of heavy-drawn nanocrystalline CoCrNi medium entropy alloy wire

High-strength metallic wire is a vital bearing structure used in many industrial fields. Impact loads often challenge the service safety of metal wire in engineering applications. However, few studies have been made on the dynamic mechanical behavior of metallic wires, especially for newly developed high-entropy alloy wires. By equipping split Hopkinson tension bar (SHTB) with specially designed test fixtures, we have carried out a systematic study on the dynamic deformation behavior of the heavily-drawn CoCrNi medium-entropy alloy (MEA) wire in impact tension at both room and cryogenic temperatures. We show that these millimeter-diameter MEA wires with nano-scale grains can achieve an excellent combination of impact tensile strength and ductility at 293 K and 77 K. More interestingly, we find that the strength and ductility of the MEA wire were enhanced simultaneously with decreasing temperature and increasing strain rate. Detailed microstructure characterizations and molecular dynamics simulations reveal that the increased strength and ductility at coupled high strain and low temperature resulted from the multiplication and thinning of nanoscale twins, which further caused additional strengthening and toughening mechanisms such as stack faulting net and secondary twin. This study highlights the advantage of CrCoNi MEA wire for cryogenic temperature and impact applications and provides an experimental reference for the design and evaluation of high-strength metal wires under such extreme conditions