浅析我国B2C电子商务的现状及发展趋势

互联网在中国的普及为网络购物提供了技术基础,越来越多的中国居民开始采用网络购物这一新兴购物方式。本文就我国B2C电子商务的现状进行分析,发现目前我国网络购物市场中B2C市场份额虽小,但发展潜力巨大,因此各方都看好B2C电子商务模式。从长远来看,B2C模式的电子商务因其自身具有的特点和优势将会成为未来网购市场的主导,而各种电子商务模式也会在未来不断融合,彼此之间的界限也越来越模糊。     

高效液相色谱法测定安徽产木通药材中3种有效成分含量

目的测定安徽产木通药材中木通苯乙醇苷B、齐墩果酸和常春藤皂苷元的含量,考察安徽产木通药用价值。方法采用高效液相色谱法,木通苯乙醇苷B的色谱测定条件为:Alltima C18柱(4.6 mm×250mm,5μm),流动相是甲醇-水-磷酸(35∶65∶0.05),流速1.0mL/min,检测波长330nm,柱温35℃;齐墩果酸和常春藤皂苷元的色谱测定条件为:Alltima C18柱(4.6mm×250mm,5μm),流动相是乙腈-水(65∶35),流速1.0mL/min,检测波长203nm,柱温25℃。结果安徽宁国、明光产木通药材中木通苯乙醇苷B、齐墩果酸和常春藤皂苷元含量高于市售木通。结论安徽宁国、明光产木通药材质量较好,可进一步开发利用。     

Guest workers or unauthorized immigrants? The case of forest workers in the United States

This study examines regional differences in the legal status of forest workers in the Pacific Northwest and Southeastern United States, using United States Department of Labor data and qualitative fieldwork in Alabama and Oregon. The authors find that there are significantly fewer H-2B guest workers on federal lands in Oregon than on privately owned forest plantations in Alabama, and the Southeast more generally. By contrast, numerous workers on federal lands in Oregon are undocumented. This difference may largely be explained by variations in the economies of scale in forest work in the Pacific Northwest (federal lands) and the Southeast (mainly private lands). The study also finds that there is no real difference in the working conditions of undocumented immigrants and guest workers—both groups face labor exploitation. Guest workers in the forest industry, many of whom have no previous work experience or access to social networks in the United States, face extreme isolation at worksites, are beholden to contractors, fear losing their jobs if they complain, and are generally unaware of their basic rights. By contrast, many undocumented forest workers in Oregon belong to established social networks through which they are recruited onto forest labor crews. However, unauthorized workers are also vulnerable to labor exploitation because they fear deportation and are obliged to their kin-employers. Policy recommendations to improve labor conditions and enforce existing labor laws for all forest workers include: better tracking of workers across states to monitor labor abuses, allocating more resources to state labor departments to facilitate worker outreach and worksite inspections, and better communication among land management officials and the Department of Labor.

肺气虚证大鼠血液流变性指标与内皮素、血栓素水平的相关性研究

目的 :探讨肺气虚证大鼠的血液流变性变化与内皮素 (ET)、血栓素 (TXB2 )变化的相关性。方法 :将 6 0只大鼠随机分为模型组与对照组 ,复制肺气虚证模型 ,分别检测血液流变性指标和ET、TXB2 水平。结果 :模型组与对照组比较 ,全血黏度 (高切、低切 )、血浆黏度、红细胞比容、红细胞聚集指数及纤维蛋白原均升高 ,差异有显著性 (P <0 .0 1或P <0 .0 5 ) ;模型组ET和TXB2 明显升高 ,与对照组相比 ,差异有显著性 (P <0 .0 1)。模型组全血黏度与ET、TXB2 呈正相关 (r =0 .95 7,P <0 .0 5 ;r =0 .992 ,P <0 .0 1)。结论 :肺气虚大鼠存在“血瘀”现象 ,且血浆中的ET、TXB2 含量随肺气虚证逐渐加重而呈上升趋势。     

Analysis of 4‐Bromo‐2,5‐DimethoxyphenethylamineAbuser's Urine: Identification and Quantitation of Urinary Metabolites

The metabolites of 4‐bromo‐2,5‐dimethoxyphenethylamine (2C‐B), a psychoactive drug with hallucinogenic activity, were investigated in a urine sample from a user of 2C‐B. The urine sample was deconjugated enzymatically and the metabolites were recovered by liquid–liquid extraction. The extract was analyzed by gas chromatography/mass spectrometry after derivatization, and the results were used to identify and quantitate the metabolites. 4‐Bromo‐2,5‐dimethoxyphenylacetic acid was the most abundant metabolite of 2C‐B in human urine and accounted for 73% of the total amount of detected metabolites, followed by 4‐bromo‐2‐hydroxy‐5‐methoxyphenylacetic acid (13%) and 4‐bromo‐2,5‐dimethoxyphenylethyl alcohol (4.5%). According to the literature, the main metabolites of 2C‐B in rat urine are N‐(4‐bromo‐2‐methoxy‐5‐hydroxyphenylethyl)acetamide and N‐(4‐bromo‐2‐hydroxy‐5‐methoxyphenylethyl)acetamide. However, these metabolites accounted for only a small proportion of the total amount of detected metabolites in human urine, which indicates that there are significant species‐specific differences in the metabolism of 2C‐B. 4‐Bromo‐2,5‐dimethoxyphenylacetic acid, which was the most abundant metabolite in human urine, is thought to be generated by deamination of 2C‐B by monoamine oxidase (MAO) followed by oxidation by aldehyde dehydrogenase. Our results suggest that MAO plays a crucial role in the metabolism of 2C‐B in humans.     

中药熏洗联合窄谱中波紫外线照射治疗手足慢性湿疹疗效观察

目的 观察中药熏洗联合窄谱中波紫外线（narrow band ultraviolet B,NB UVB）照射治疗手足慢性湿疹的临床疗效。方法 将94例手足慢性湿疹患者随机分为中药组、光疗组和联合组。中药组外用自拟中药煎剂熏洗,光疗组予以NB UVB照射,联合组采用中药熏洗与NB UVB照射两种疗法相结合进行治疗。结果 联合组有效率为97.06％,中药组为71.88％,光疗组为71.43％。3组之间有效率比较,差异具有统计学意义(P＜0.05)。联合组有效率显著高于中药组和光疗组（P＜0.01）。3组治疗后症状积分均显著低于治疗前(P＜0.01),联合组治疗后症状积分显著低于中药组和光疗组(P＜0.01）。结论 中药熏洗联合NB UVB照射可显著提高手足慢性湿疹的疗效。     

企业信息化系统的方案设计

企业信息化已经成为企业的命脉和核心竞争力的重要手段。合理地利用好信息技术,企业的效率和竞争力就会大大提升。文中对最新的信息化技术进行了深入的分析,并给出了某制造企业的信息化开发方案。     

Comparison of German population data on the apoB-HVR locus with other Caucasian, Asian and Black populations

A population study of 505 unrelated individuals from Southwestern Germany was carried out on the 3′-apoB hypervariable region (HVR). After amplification via polymerase chain reaction (PCR) and agarose gel electrophoresis, 15 different alleles and 47 genotypes were observed. The most common alleles were hypervariable elements (HVE) 37 and 35 with an allele frequency of 0.374 and 0.244, respectively. The heterozygosity index was calculated to be 78.4%. Allele frequencies of this study are compared with results from other databases obtained from a French, a Spanish, an Asian and an American (Black) population.     

屠宰猪肝和血清中乙型肝炎病毒及戊型肝炎病毒的检测

应用1对乙型肝炎病毒(HBV)S基因保守区的引物,采用PCR方法从屠宰猪肝、血清中检测到了HBV,序列分析表明,扩增片段与已发表的HBV S基因的同源性高达98%~100%。电镜负染色样品观察结果表明,在HBV表面抗原ELISA检测强阳性反应的血清样品中存在有形态、大小与人HBV Dane颗粒和小球状颗粒相似的病毒粒子。针对戊型肝炎病毒(HEV)ORF2/ORF3重叠区设计了简并引物,采用巢式RT-PCR对屠宰猪肝和血清样品进行了检测。结果表明,部分屠宰猪肝中存在HEV。     

乐果亚急性暴露对大鼠胆碱酯酶浓度及细胞色素P450亚型表达量的影响

对6周龄雄性Wistar大鼠5次灌胃给予20%LD_(50)的乐果,观察给药后大鼠的毒性反应,每日测定实验鼠采食量、饮水量和体重。最后一次给药后第24 h,采用丁酰硫代胆碱法测定大鼠红细胞、血清和脑组织中的胆碱酯酶浓度,并采用定量RT-PCR法检测大鼠肝中细胞色素P450基因8个亚型的表达量。结果表明,大鼠用药后不同时间内出现了有机磷药物中毒的典型症状,其采食量、饮水量和体重明显下降,红细胞、血清和脑组织中胆碱酯酶浓度均明显低于对照组,肝细胞色素P450的8个亚型中CYP2B1/2的表达量明显高于对照组。