Study on chromatographic fingerprint of sarcandra glabra （Thunb.） by microwave-assisted extraction coupled to HPLC/DAD

Microwave-assisted extraction (MAE) was used for extraction of effective components of sarcandra glabra (Thunb.), and then chromatographic fingerprint of sarcandra glabra (Thunb.) was studied by high performance liquid chromatography/diode array detector (HPLC/DAD). The conditions of MAE were optimized by an orthogonal experiment, and then the authentication and validation of the chromatographic fingerprint were conducted. Nine peaks were identified as common peaks in the fingerprint chromatograms, and isofraxidin was considered as a reference compound and quantified. Relative standard deviations of retention time and peak area of each component were less than 3% and 8%, respectively. Similarity and difference analysis were conducted by use of PCA and relation coefficient. Twenty batches of sarcandra glabra (Thunb.) samples from two different producing areas could be classified into two different groups in the PCA model. The results showed that MAE-HPLC/DAD method was simple, efficient and stable for the study of complex chromatographic fingerprint of sarcandra glabra (Thunb.), which could provide more reliable and precise information for quality evaluation.     

桥梁施工中预应力技术的实践与探索

阐述了当下公路桥梁施工中预应力技术应用的状况,并且分析了公路桥梁施工中预应力技术的应用,提出了预应力技术在公路桥梁施工中应用的控制措施。     

保护气体对气体保护焊焊缝质量及焊缝外观的影响

本文讨论了各种混合保护气体对熔化极气体保护焊和钨极气体保护焊焊缝质量以及焊缝外观的影响。     

列控车载设备故障掉码处理

杭州电务段管内沪昆线,既有C0区段的沪杭段,又有C2区段的浙赣段,随着动车组在沪昆线运行的不断增多,列控车载设备掉码问题严重影响动车组的正常运行。下面结合嘉兴站4G发车,进入嘉兴东站ⅡG接车进路后的掉码实例,谈一下故障处理过程。     

一类弱非线性常微分方程的插值摄动解法

用插值摄动法＾「１」研究一类弱非线性常微分方程的初值问题，得到了一级及二级近似解。解的精度很高，并逐级提高。如果用正则摄动法求解法此类问题，则当自变量较大时，误差很大。     

混凝土轨枕轨道使用钢轨防爬器的试验

由美国运输技术中心（TTCI）与美国太平洋铁路公司（UP）共同进行的运营线路试验结果显示，在混凝土轨枕试验点安装的防爬器，对于减少中和轨温的短期或长期的变化都没有起到增强的作用．同时．当一对绝缘接头夹板出现裂缝时也未能阻止中和轨温的大幅度下降。     

INFLUENCE OF ANTIDROM IC ELECTRIC STIM ULATI ON ONPREPROTACHYKININ m RNA EXPRESSION IN ADJACENT DORSAL ROOT GANGLIA OF RATS

Ｔｈｅｔｈｅｏｒｉｅｓｏｆｃｈａｎｎｅｌｓａｎｄｃｏｌｌａｔｅｒａｌｓａｒｅｔｈｅｃｏｒｅｏｆｔｈｅｔｒａｄｉｔｉｏｎａｌｃｈｉｎｅｓｅｍｅｄｉｃａｌｓｃｉｅｎｃｅ．Ｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆｍｏｄｅｒｎｂｉｏｌｏｇｙ，ｅｓｐｅｃｉａｌｌｙｔｈｅｄｅｅｐｕｎｄｅｒｓｔａｎｄｉｎｇｏｆｔｈｅｓｔｒｕｃｔｕｒｅａｎｄｆｕｎｃｔｉｏｎｏｆｎｅｕｒａｌｓｙｓｔｅｍ，ｐｒｏｖｉｄｅｕｓｓｔｒｏｎｇｅｖｉｄｅｎｃｅａｎｄｍｅｔｈｏｄｓｉｎｒｅｓｅａｒｃｈｏｆｃｈａｎｎｅｌｓａｎｄｃｏｌｌａｔｅｒａｌｓ…     

THE DETERMINATION OF ESTRADIOL IN SHEEP PLACENTA POWDER BY RADIO-IMMUNOASSAY

Ｐｌａｃｅｎｔａｉｓａｋｉｎｄｏｆｔｒａｄｉｔｉｏｎａｌｃｈｉｎｅｓｅｅｘｃｅｌｌｅｎｔｈｅａｌｔｈｐｒｏｔｅｃｔｉｖｅｆｏｏｄｔｏｋｅｅｐｐｅｏｐｌｅｉｎｈｅａｌｔｈ．Ｔｈｅｓｈｅｅｐｐｌａｃｅｎｔａｓｔｒｕｃｔｕｒｅｉｓｓｉｍｉｌａｒｔｏｈｕｍａｎ，ｉｔｉｓｂｅｓｔｓｕｂｓｔｉｔｕｔｅｏｆｈｕｍａｎｐｌａｃｅｎｔａｓ．Ｔｈｅｙｃａｎｂｅｐｒｏｄｕｃｅｄｉｎｌａｒｇｅａｍｏｕｎｔ〔１〕．Ｔｈｅｒｅｓｕｌｔｓｏｆｅｘｐｅｒｉｍｅｎｔｓｓｈｏｗｅｄｔｈａｔｓｈｅｅｐｐｌａｃｅｎｔａｓｃａｎｉｍｐｒ…     

Determination of wholesome elements and heavy metals in safflower （Carthamus tinctorius I.. ） from Xinjiang and Henan by

An inductively coupled plasma mass spectrometry （ICP-MS） or inductively coupled plasma atomic emission spectrometry （ICP-AES） was developed to determine 19 elements in safflower, a traditional Chinese medicinal herb from Xinjiang Autonomous Region and Hen