激光显微捕获口腔上皮细胞的DNA分型

目的探索激光显微技术(lasercapturemicrodissectionsystem,LCM)捕获口腔上皮细胞,并进行STR-DNA分型检测的方法。方法用VERITAS显微切割仪红外低能激光显微捕获一定数量口腔上皮细胞,进行ProfilerPlus试剂盒STR复合扩增,检测DNA基因型。结果7～8个口腔上皮细胞能成功获得STR-DNA分型。3～4个口腔上皮细胞不能成功获得STR-DNA分型。结论激光显微捕获作为一种分离单个细胞的新技术,对于微量口腔上皮细胞的STR-DNA分型是可行的。     

猪丹毒豚鼠系弱毒菌株对猪口服免疫的研究——G370菌株口服免疫区域试验

以G370菌株试制的冻干菌苗,先后在黑龙江省、辽宁省及江苏省的4个地区6个单位不同类型猪只,总共口服95724头猪,反应率为0.07％。证明对猪口服免疫是安全有效的,对各期妊娠母猪口服同样是安全有效,在发生疫情的猪群中也可用于紧急口服免疫。     

从心理语言学的角度看英语口语教学

英语口语教学必须从实际情况出发 ,同时必须遵循心理语言学所揭示的语言产生的规律。教师在教学过程中 ,要引导学生认识语言产生的内在规律 ,明确口语教学的意义 ,并设置恰当的语言环境 ,帮助学生消除恐惧心理。而学生除应有扎实的英语基本功底外 ,还应加强发音训练 ,掌握口语技能     

Proficiency testing (external quality assessment) of drug detection in oral fluid

Eighteen external quality assessment (proficiency testing) samples were prepared from client specimens collected with the Intercept^® oral fluid collection device and by spiking drug-free oral fluid. Samples were circulated in pairs at quarterly intervals to 13 UK and USA based laboratories for analysis by a panel of OraSure micro-plate Intercept^® enzyme immunoassay kits and hyphenated mass spectrophotometric techniques. During the survey, there was a single case of non-specificity in a false report for methadone. The major errors were of lack of sensitivity relative to the concentration thresholds specified for the immunoassays. The sensitivity for overall ‘present’/‘not found’ reports calculated as true positives/(true positives + false negatives) were for the amfetamine specific assay 50%, methyl-amfetamines 93%, barbiturates 64%, cannabinoids 73%, cocaine and metabolites 100%, benzodiazepines 69%, methadone 95%, opiates 79% (opiates excluding oxycodone 93%), phencyclidine 93% and human gamma-globulin 97%. A small number of the sensitivity errors were attributable to errors in chromatographic confirmation techniques.     

Determination of MDMA, MDA, MDEA and MBDB in oral fluid using high performance liquid chromatography with native fluorescence detection

This paper describes the analytical methodology for the determination of MDMA, MDA, MDEA and MBDB in oral fluid. After a liquid–liquid extraction, the analysis was carried out by high performance liquid chromatography (HPLC), with fluorescence detection. The detector wavelength was fixed at 285 nm for excitation and 320 nm for emission. The mobile phase, a mixture of phosphate buffer (pH = 5) and acetonitrile (75:25), and the column, Kromasil 100 C8 5 μm 250 mm × 4.6 mm, allowed good separation of the compounds in an isocratic mode in only 10 min. The method was validated and showed good limits of detection (2 ng/mL) and quantitation (10 ng/mL) for all the amphetamine derivatives. No interfering substances were detected. A stability study of these compounds in oral fluid stored at three different temperatures (−18, 4 and 20 °C) over 10 weeks was conducted, showing a time-dependent degradation of the four compounds.     

Analysis of Δ-tetrahydrocannabinol in oral fluid samples using solid-phase extraction and high-performance liquid chromatography–electrospray ionization mass spectrometry

An analytical method using solid-phase extraction (SPE) and high-performance liquid chromatography–mass spectrometry (LC–MS) has been developed and validated for the confirmation of Δ⁹-tetrahydrocannabinol (THC) in oral fluid samples. Oral fluid was extracted using Bond Elut LRC-Certify solid-phase extraction columns (10 cm³, 300 mg) and elution performed with n-hexane/ethyl acetate. Quantitation made use of the selected ion-recording mode (SIR) using the most abundant characteristic ion [THC + H⁺], m/z 315.31 and the fragment ion, m/z 193.13 for confirmation, and m/z 318.00 for the protonated internal standard, [d₃-THC + H⁺]. The method proved to be precise for THC, in terms of both intra-day and inter-day analyses, with coefficients of variation less than 10%, and the calculated extraction efficiencies for THC ranged from 76 to 83%. Calibration standards spiked with THC between 2 and 100 ng/mL showed a linear relationship (r² = 0.999). The method presented was applied to the oral fluid samples taken from the volunteers during the largest music event in Portugal, named Rock in Rio-Lisboa. Oral fluid was collected from 40 persons by expectoration and with Salivette^®. In 55% of the samples obtained by expectorating, THC was detected with concentration ranges from 1033 to 6552 ng/mL and in 45% of cases THC was detected at concentrations between 51 and 937 ng/mL. However, using Salivette^® collection, 26 of the 40 cases had an undetectable THC.     

毒品案件中口供等言词证据的收集及运用

毒品案件审理过程中各类言词证据的收集,既要反对“口供是证据之王”的观点,更不能片面地理解“零口供”,只有全面的掌握案件事实,运用辩证的逻辑推理,才能使言词证据成为认定毒品案件的可靠手段。即:做好毒品犯罪嫌疑人供述和辩解(口供)的讯问笔录;全面收集证人证言;对查获的毒品交专门机构做出定性鉴定结论;言词证据应由实物证据来检验;严禁刑讯逼供和其他非法方式收集言词证据。     

任务型教学法在警务英语口语教学中的应用

基于公安部公安院校招录培养体制改革对人才培养提出的特殊要求及体改生英语成绩的差异性和学时的有限性,警务英语口语教学采用任务型教学法,旨在让学生在完成任务过程中提高警务口语学习的动机和兴趣,进而增强学生的综合素质。     

多媒体网络环境下的视听说教学模式探索

视听说是英语专业学生的一门基础课,也是一门语言综合能力训练课。本文通过分析此课程的特点,对网络视听说英语教学模式做了详细的分析,并就多媒体网络视听说的实践与研究进行了总结,希望对研究、建立其它教学模式能起到借鉴的作用。     

检测体液中氰含量的荧光光度法研究

本文报道了应用取代反应检测体液中氰含量的荧光光度法。探讨了检测的具体方法和有关条件对检测的影响。检测了正常人血、尿液和唾液中氰含量,并检测了小鼠氰化物染毒死亡后血中氰含量。研究表明,本法不但可检测体液中致死量的氰化物含量,亦可检测体液中正常氰含量。