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181.
A method for the selenium determination in a mother and her child's hair using palladium as a chemical modifier was optimized. The sample was digested with nitric acid and hydrogen peroxide and diluted to 5 ml. To achieve complete mineralization the samples were ashed at 1200 degrees C in the presence of palladium as a chemical modifier. The optimum atomization temperature was 1900 degrees C. The precision and accuracy of the method were studied using the reference material CRM 397. Results of calibration using aqueous standards and the standard addition method were compared. The method was applied to the selenium determination in 30 samples of the mother's and child's hair. The levels found were 0.54 +/- 0.34 microgram/g for mother's hair and 0.77 +/- 0.25 microgram/g for child's hair.  相似文献   
182.
西部地区最大的共同的资源优势就是旅游资源。研究西部大开发与旅游业的关系,精心培育旅游产业,在西部大开发中加速旅游产业化进程,在旅游产业化进程中促进西部大开发,把旅游的资源优势转化为经济优势和市场优势,构筑经济增长的支撑力,是实现经济增长的一条重要途径。 旅游产业化要对传统旅游业批判继承进行理论创新。 ——观念创新。这是旅游产业化的先导。观念创新的关键是解放思想、深化  相似文献   
183.
陈水扁在台湾选举获胜后,于5月 20日发表了“就职演说”。在这篇5000字的讲话中,陈水扁以所谓民主的胜利来总结台湾选举的经验,并再次承诺“全民政府,清流共治”的施政理念。但在两岸关系的定位问题上,却颠倒次序、刻意模糊。陈水扁“五·二○”讲话费尽心机、用心良苦,但他仍不承认一个中国原则,搞隐性“台独”,以拖待变,抗拒和拖延两岸统一进程,企图以“人权牌”使台湾问题国际化,对此我们要进行坚决的斗争。  相似文献   
184.
话语分析、文本解读是西方后现代国际关系理论倡导的主要研究方法之一.本文以福柯的"话语观"对后现代国际关系理论的影响为切入点,探讨了话语分析与国际关系研究的重要关系;同时提出将批判性话语分析为核心的"多维话语分析方法"引入国际关系研究领域,作为具体的话语分析方法使用.  相似文献   
185.
We describe the gross and microscopic neuropathological changes in the brain of a 17-year-old male who died 4 days after being poisoned with cyanide. Previous reports indicate that following cyanide intoxication, the brain develops diffuse hypoxic/ischemic changes, predominantly of the basal ganglia. The case we describe here had similar features but in addition showed striking laminar necrosis of the cerebral cortex. This finding in cyanide poisoning has been previously demonstrated by neuroimaging, but not pathologically.  相似文献   
186.
Sequence polymorphism of the mitochondrial DNA (mtDNA) control region, hypervariable regions HVR I, HVR II and HVR III, from 51 unrelated China Han (Yan Bian area) were determined by PCR amplification and cycle sequencing.  相似文献   
187.
A total of 201 males from Somalia were typed for the Y-chromosome STRs DYS19, DYS385a/b, DYS389-I, DYS389-II, DYS390, DYS391, DYS392, DYS393, DYS437, DYS438 and DYS439 with the PowerPlex Y kit (Promega). A total of 96 different haplotypes were observed and the haplotype diversity was 0.9715. The number of unique haplotypes was 71 while the most common haplotype was observed 24 times.  相似文献   
188.
A qualitative and quantitative analytical method was developed and validated for the determination of 49 licit and illicit drugs in oral fluid. Small oral fluid samples, volume 1mL, were collected from volunteers using a modified Omni-Sal device and the analytes were extracted from an oral fluid/buffer mixture using a single Bond Elut Certify solid phase extraction cartridge. Liquid chromatography-tandem mass spectrometry (LC-MS-MS) and gas chromatography-repetitive full scan mass spectrometry (GC-MS) were used in parallel to analyze the extracts for the targeted drugs. Extracts were analyzed by GC-MS in their underivatized form and as their pentafluoropropionyl derivatives. Deuterated internal standards were used for quantification of drugs of abuse by LC-MS-MS to minimize matrix effects. Methadone-d(9) and tumoxetine were used as the internal standards for quantification of non-derivatized and derivatized analytes respectively by GC-MS. Linearity was demonstrated over the range 5-200 ng/mL and limits of detection were less than 4 ng/mL for each drug analyzed. The method demonstrated acceptable recoveries for most of the analytes and good intra- and inter-day precision. Acquisition of data by repetitive full scan GC-MS allows the addition of further analytes to the target menu.  相似文献   
189.
A total of 185 unrelated Danish males were typed for the Y-chromosome STRs DYS19, DYS385a/b, DYS389-I, DYS389-II, DYS390, DYS391, DYS392, DYS393, DYS437, DYS438 and DYS439 using the kits PowerPlex Y (Promega), ReliaGene Y-Plex 6 and ReliaGene Y-Plex 5 (Reliagene Technologies). A total of 163 different haplotypes were observed and among these, 144 haplotypes were unique. The gene diversity was 0.9985. In DYS392, a variant allele migrating as a 10.2 allele was observed. Sequencing of the allele showed a deletion upstream the repeated area.  相似文献   
190.
加强学生思想政治教育势在必行。我校思想政治教育存在"两课"教学与学生思想实际脱节,学管工作方法滞后,与学生沟通少等问题。构建思想政治教育模式的具体做法包括:实行思想政治教育辅导员制,采取观察法、调查法、反馈法、实践法等。  相似文献   
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