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1.
乳清酸的单扫示波极谱研究   总被引:1,自引:0,他引:1  
乳清酸在0.1mol/LHClO4+0.02mol/LNaClO4底液中,于JP-2型示波极谱仪上,有一良好的二阶导数峰Ep=-0.860±0.01V(SCE),浓度在1×10-7~6×10-5mol/L范围内,与峰高成线性关系,检测限为7.5×10-8mol/L.实验证明,电极过程为具有催化性质的双电子可逆过程.  相似文献   

2.
黄芩甙的极谱研究   总被引:1,自引:0,他引:1  
用单扫示波极谱法研究了黄芩甙的电化学特性.在0.05mol/L柠檬酸钠+0.2mol/LHCl底液中,黄芩甙于-1.16V(P1)和-1.34V(P2)(vs.SCE)处产生两个二阶导数峰,前者为黄芩甙分子的还原波,后者为其一价阴离子的还原波,均为羰基的双电子还原波.利用峰P1可测定黄芩甙,线性范围为0.16~0.64mg/L和0.72~24mg/L,检测限为0.08mg/L.将该法用于中药黄芩中黄芩甙的测定时,获得满意结果  相似文献   

3.
孙性善  郑根香 《科技通报》1994,10(2):120-123
报道了Iodogen法碘化标记单克隆抗体(单抗)的最佳条件和对标记单抗免疫活性影响的实验结果,结果表明,当Iodogen:McAb=1:4缓冲液pH=7.4,旋涡搅拌10min时,标记率、放化纯和峰值百分率均较高,标记单抗的免疫活性与标记前比较没有统计学差异(P>0.05)。 ̄131I-HCM83和 ̄125I-VCMC与阳性对照结合率为38.2%和30.1%,P/N为9.1和30.1。此通用技术具有推广应用价值。  相似文献   

4.
本文系统地研究了甲硝唑在汞电极上的电极过程,证明了该电极过程为一含有吸附作用的不可逆的扩散控制过程,电子转移数为4,不可逆系数a=0.714.建立了甲硝唑的单扫示波极谱测定法,在0.20mol/L的NaCl溶液中,于-0.71V(vsSCE)处的峰高与浓度[(0.02─80)mg/L]间存在良好的线性关系,检测限为2.4μg/L,RSD=2.0%(n=8),并考察了人体内常见微量物质对的影响。  相似文献   

5.
朱岩  李刚 《科技通报》1994,10(5):297-300
采用梯度淋洗离子色谱法对碱金属、碱土金属及其铵类进行分析,该方法采用CG3分离柱,0.3mmol/LHCl为淋洗剂,4min后改用3.0mmol/L盐酸间苯二胺和5.0mmo1/LHCl作淋洗剂(流速2.0ml/min)采用微膜抑制柱,再生液为50mmol/LKOH(流速2.0ml/min),用电导检测法分别检测Li ̄+、Na ̄+、NH、K ̄+和Mg ̄(2+)、Ca ̄(2+)、Sr ̄(2+)、Ba ̄(2+).对分析条件进行了探讨.  相似文献   

6.
1原理①2〔Ag(S2O3)2〕3-+S2-Ag2S↓+4S2O2-3②3Ag2S+2AlΔ6Ag+Al2S3+热量注:②反应放出的热量极大,类似铝热反应,可使银在反应中熔为液态而聚集于钳锅底部结为银块。2步骤2.1从医院或照相部购买废定影液后,加入...  相似文献   

7.
运用IR、DSC和电化学测试等手段,对PVB+LiClO4+PC组成的聚合物 电解质的化学和电化学稳定性作了初步的研究。本实验制备的聚合物电解颀在250℃以下的温度范围内,具有较好的热稳定性。由Pt/PVB+LiClO4+PC/Li组成的测试电池的开路电压为2.3V(vs.Li^+/Li),并随时间延长而减小。聚合物电解质阳极过程的稳定性受到阴离子氧化电位的限制,在0~4.2V(vs.Li^+/L  相似文献   

8.
同步辐射对直肠癌组织微量元素测定的意义探讨   总被引:2,自引:0,他引:2  
采用同步辐射荧光分析光谱法(SRXFS)对9例直肠癌及癌旁移行粘膜和正常粘膜中微量元素的含量进行分析,结果显示,癌组织中Cu、Zn、Mn三种微量元素相对含量分别为38199.16、15557.04和209.86,显著低于正常粘膜组织(P<0.05,或P<0.001);而宏量元素Cl含量为3438.16,显著高于正常粘膜(P<0.05)。癌旁移行粘膜中Cu、Zn、Mn、Cl、Ti、Se元素含量介于癌组织和正常粘膜之间,作者认为,微量元素Cu、Zn、Mn可能是直肠癌的相关性元素,癌旁移行粘膜多种元素含量变化趋势,提示癌旁移行粘膜可能是一类潜在性交界性瘤变。  相似文献   

9.
抗人甲胎蛋白(AFP)单克隆抗体的制备及其特性研究   总被引:2,自引:0,他引:2  
边敏章 《科技通报》1998,14(4):240-242
采用亲和层析法纯化的AFP抗原免疫的BALB/c鼠脾细胞与SP2/0小鼠骨髓瘤细胞系融合,获三株分泌抗人AFP单克隆抗体(McAb)的杂交瘤细胞系.用ELISA阻断试验和夹心ELISA试验作特异性鉴定,杂交瘤细胞株染色体的众数为104条,三株细胞系McAb均属小鼠IgG1型.经体外连续传代3个月及冻存一年复苏后均能持续分泌抗AFP抗体  相似文献   

10.
不可逆卡诺热机的最优性能   总被引:5,自引:0,他引:5  
陈林根  孙丰瑞 《科技通报》1995,11(2):127-127
不可逆卡诺热机的最优性能El-Wakil ̄[1]和Curzon-Ahlborn ̄[2]导出了内可逆卡诺热机的效率界限η_(cA),严子浚进一步导出了其最佳功率P、效率η关系,此时P-η呈抛物线关系 ̄[3].实际热机为不可逆循环,除热阻外还存在其它很多...  相似文献   

11.
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China's science enterprise by making S&T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party's Leading-member Group at CAS, which was held from 7 to 11 January in Beijing.  相似文献   

12.
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors.  相似文献   

13.
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants."  相似文献   

14.
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007.  相似文献   

15.
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.  相似文献   

16.
Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies.  相似文献   

17.
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means.  相似文献   

18.
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP.  相似文献   

19.
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.  相似文献   

20.
Prof. SUN Changpu from the CAS Institute of Theoretical Physics and coworkers from University of Basel in Switzerland have worked out a way --at least in theory --to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams and is similar to the famous Stern-Gerlach effect, whereby a beam of atoms passing through a magnetic field is split in two according to the atoms' spin states (Phys. Rev. Lett. 99 130403).  相似文献   

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