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Search Results: 1 - 10 of 79374 matches for " 蔡丽姝 "
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巢湖四条入湖河流硝态氮污染来源的氮稳定同位素解析
,孔繁翔,元锋,阳振,王济奎,史小
湖泊科学 , 2012, DOI: 10.18307/2012.0619
Abstract: 采用氮稳定同位素技术对巢湖四条主要污染输入河流(南淝河、十五里河、派河和双桥河)的氮污染状况和硝态氮来源进行研究.结果表明,巢湖四条入湖河流氮污染最严重的是十五里河,其次是南淝河和派河,双桥河的污染相对较轻.硝态氮的稳定同位素分析结果表明,巢湖四条入湖河流的硝态氮污染物在季节上受到不同因子的影响.十五里河和南淝河的硝态氮污染主要来源于城市生活污水和工业废水;派河的硝态氮污染在冬季主要来源于工业废水,春季来源于农业面源,而在夏季主要受到雨水的影响;双桥河的硝态氮污染冬、春季主要来源于农业面源,夏季主要受雨水的影响.此外本研究结果还表明巢湖四条主要入湖河流的氮污染源主要为铵态氮,因此今后要对铵态氮的来源进行同位素示踪.
沈阳市女性性服务者艾滋病预防干预效果评价
王晓,谷渊,王路,管威,谷晶,赵丽莉,李韫,,付敏,马宁
中国公共卫生 , 2008, DOI: 10.11847/zgggws2008-24-06-52
Abstract: ?目前,我国的艾滋病(AIDS)流行在总体上呈低流行状态,但在局部地区及特定人群呈高流行,并正从高危人群向一般人群扩散(1)。沈阳市人类免疫缺陷病毒(HIV)感染者和AIDS患者主要分布在沈阳市市内5区,流行趋势从静脉吸毒为主转向性途径蔓延扩散,经性接触感染是沈阳市HIV传播的主要途径。为有效控制艾滋病经性传播,2006年7月沈阳市开始实施全球基金第五轮艾滋病项目,针对女性性服务者(CSW)、男男性接触者、流动人群进行行为干预效果评估,为及时调整有效的艾滋病预防控制措施提供科学依据。
树叶为模版制备网状TiO2和Fex/TiO2及光催化活性研究
,
分子催化 , 2012,
Abstract: 以梧桐树叶为模板制备了具有网状结构的TiO2和Fex/TiO2光催化材料。通过扫描电镜(SEM)、X-射线衍射(XRD)、分子荧光发射光谱(PL)、紫外-可见吸收光谱(UV-Vis)等对这两类光催化材料的结构和物理性能进行了表征。结果表明,以树叶为模板制得的Fe0.005/TiO2呈网状结构。在600- 800℃范围内,随煅烧温度的升高,网状TiO2和Fe0.005/TiO2中锐钛型TiO2的含量减少,Fe3 的掺杂能促进锐钛型向金红石型的转变。与Degussa P25相比,网状TiO2和Fex/TiO2的分子荧光光谱强度明显减弱,光生电子-空穴对的复合情况得到改善;吸收光谱范围明显红移,禁带宽度有不同程度的缩小。孔雀石绿的光催化降解实验表明,网状TiO2和Fex/TiO2具有比Degussa P25更强的催化活性。光催化活性的稳定性研究表明,网状Fe0.005/TiO2具有良好的稳定性,能多次重复使用。
吡非尼酮对特发性肺纤维化疗效的Meta分析
Efficacy and Safety of Pirfenidone in Treatment of Idiopathic Pulmonary Fibrosis: A Meta-analysis

张甲翠,,刘华,曦光,宋攀,吴晚舟,,罗云霞,魏海东
- , 2015, DOI: 10.7507/1671-6205.2015138
Abstract: 目的系统评价吡非尼酮对特发性肺纤维化(IPF)的疗效和安全性。 方法计算机检索在PubMed、Cochrane图书馆、中国期刊全文数据库(CNKI)、中国生物医学文献数据库(CBM)、万方数据库、中文科技期刊全文数据库(VIP)发表的以吡非尼酮为干预措施治疗IPF的随机对照试验。按Cochrane系统评价方法,评价纳入研究的方法学质量并提取有效数据,采用RevMan 5.2进行Meta分析。 结果最终纳入6篇文献,合计1 727例。Meta分析结果显示,与安慰剂对照组比较,吡非尼酮能提高治疗前后肺活量变化率[WMD=0.06,95%CI(0.01,0.12),Z=2.48,P=0.01;异质性检验χ2=1.03,P=0.31];不能提高治疗前后6分钟步行试验中最低氧分压变化率[WMD=0.82,95%CI(-1.35,2.98),Z=0.74,P=0.46;异质性检验χ2=8.90,P=0.003];不能降低病死率[RR=0.62,95%CI(0.37,1.03),Z=1.85,P=0.06;异质性检验χ2=3.05,P=0.55]。吡非尼酮组光敏性、头晕等主要不良反应发生率明显高于对照组(P<0.05),关节痛不良反应发生率与对照组比较差异无统计学意义(P>0.05)。 结论由于纳入文献数量较少且存在设计和报道数据的缺陷,目前尚不能评价吡非尼酮的远期疗效和安全性,现有的临床试验证据不足以支持吡非尼酮成为IPF的治疗用药。
ObjectiveTo evaluate the efficacy and safety of pirfenidone in patients with idiopathic pulmonary fibrosis. MethodsPubMed, Cochrane Library, CNKI, CBM, Wanfang, and VIP databases were searched for randomized controlled trials of pirfenidone as interventions for the treatment of idiopathic pulmonary fibrosis. According to the Cochrane system evaluation method, the methodological quality of included studies was evaluated and the effective data were extracted. The meta-analysis was performed with RevMan 5.2 software. ResultsSix studies were included with 1727 patients in total. Compared with placebo groups, pirfenidon could improve the changing rate of vital capacity at the end of the treatment[WMD=0.06, 95% CI (0.01, 0.12), Z=2.48, P=0.01; heterogeneity inspection χ2=1.03, P=0.31]. Pirfenidon could not improve the changing rate of lowest SpO2 in 6-minute walking test[WMD=0.82, 95% CI (-1.35, 2.98), Z=0.74, P=0.46; heterogeneity inspection χ2=8.90, P=0.003] and could not reduce the mortality[RR=0.62, 95% CI (0.37, 1.03), Z=1.85, P=0.06; heterogeneity inspection χ2=3.05, P=0.55]. The incidences of photosensitivity, dizziness, nausea, abdominal discomfort, joint pain, fatigue in pirfenidone group were more frequent than those in placebo group. ConclusionsBecause of lack of enough eligible studies and defects in design and reporting data in the studies, this meta-analysis can not evaluate pirfenidone's long-term efficacy and safety. Hence, the existed clinical evidences can't support pirfenidone to be the treatment of IPF medication.
雏鸡对~3H-维生素A的吸收及其在体内的分布
辉益,
核农学报 , 1992,
Abstract: 选用出壳后12时龄的ArborAcres肉雏鸡165只,用放射性同位素~3H示踪法进行了~3H二维生素A(~3H—V_A)的吸收利用试验。结果表明,1—3日龄的雏鸡对V_A吸收较快,且主要集中在摄食后的2—4小时内进行,5日龄后的雏鸡对V_A的吸收速度减慢;V_A在肠道申的吸收是一个持续过程,约为24—72小时;1周龄的雏鸡对各种不同形态外源V_A的利用率分别为乳化剂89.43%,微囊型粉剂82.91%,油剂80.67%,对乳化剂V_A利用最佳。
植物生长调节物质对蓝猪耳二长雄蕊运动的影响
,
华南师范大学学报(自然科学版) , 2014,
Abstract: 蓝蓝猪耳的雄蕊授粉过程中二长雄蕊存在翻转运动的现象。为了探讨蓝猪耳二长雄蕊运动的生理机制,我们通过外施植物生长调节物质及其抑制剂来研究它们对翻转运动的作用。研究结果表明GA3和NAA缩短开花后二长雄蕊至翻转结束时间的49.1%和53.6%,GA合成抑制剂PAC和NAA运输抑制剂TIBA分别延长该过程的165.3%和59.6%。表明植物激素GA和生长素参与对蓝猪耳二长雄蕊的翻转运动的调控。
幼龄鸡卵黄囊中3h-va的吸收代谢及其利用的研究
辉益,
牲畜兽医学报 , 1993,
Abstract:
GSK-3β对流感病毒在A549细胞中复制的影响
The Impact of GSK-3β on the Replication of Influenza Virus in A549 Cells
 [PDF]

戴新宪,, 韩鸿雅
Open Journal of Nature Science (OJNS) , 2016, DOI: 10.12677/OJNS.2016.44045
Abstract:
目的:明确GSK-3β在流感病毒感染过程中所发挥的作用。方法:我们应用RNA干扰技术下调GSK-3β的表达水平后,用TCID50法测定A549细胞上清中的流感病毒滴度,并使用CCK-8细胞活力检测试剂盒和Caspase-Glo凋亡检测试剂盒检测了GSK-3β对流感病毒感染A549细胞活力及流感病毒诱导的A549细胞凋亡的影响。结果:下调GSK-3β的表达降低了流感病毒感染A549细胞上清中的病毒滴度,并且GSK-3β的表达下调还降低了流感病毒感染A549细胞的细胞活力同时增强了流感病毒诱导的细胞凋亡。结论:GSK-3β对流感病毒诱导的宿主细胞凋亡具有负调节作用并且是病毒在细胞中高效复制所必需的。
Objective: In order to clarify the role of glycogen synthase kinase-3β (GSK-3β) in the process of influenza virus infection. Methods: We preformed the RNAi to knock down the GSK-3β gene expression, then we determined the virus titers in the A549 cell supernatants by performing TCID 50 assay, and examined the influence of GSK-3β to cell viabilities of the infected cells as well as the influenza virus-induced A549 cell apoptosis using CCK-8 Kit and Caspase-Glo 3/7 Kit. Results: The results demonstrated that down-regulation of GSK3 expression decreased the viral titers in the A549 cells supernatants. Down-regulation of GSK-3β expression decreased the A549 cell viability, at the same time, increased the influenza virus induced cell apoptosis. Conclusion: Hence, GSK-3β negatively regulated the influenza virus-induced host cell apoptosis, and it was essential for the efficient replication of influenza virus.

一次天气过程影响中国城市空气质量的空间统计分析
An Spatial Statistical Analysis on the Air Quality Change in Multi-Cities System of China with Once Weather Process
 [PDF]

,
Advances in Environmental Protection (AEP) , 2015, DOI: 10.12677/AEP.2015.54012
Abstract:
城市空气质量具有区域扩散性,基于单个城市为单元的空气质量研究具有较大的局限,有必要从区域角度来分析不同城市之间的空气质量的内在联系,为区域空气质量管治提供有效的依据。选择一次冷空气过程时段,采用空间统计方法,对中国大陆86个城市在该时段的空气污染指数进行分析。结果发现,1) 当没有发生全局性影响的天气过程时,中国各城市的空气污染指数存在空间自相关性,且这种空间自相关性随着城市间距离的增大而减小,这种现象可以理解为距离较小的城市之间,其污染行为和扩散条件相对比较相似。2) 当具有全局性影响的冷空气行进时,会改变部分城市的污染扩散条件,从而可能使得这种空间自相关性得以保持。3) 在冷空气过后,所有原先空气质量较差的城市的污染得到扩散,打破了原有的空间自相关性。这证明城市空气质量的跨界溢出是客观存在的。
Due to the spatial spreading of Air pollution, it is necessary to discuss the air quality from the view of the multi-urban system, rather from the single city. The research on the cross board environ-mental spillover of the air quality among different cities is helpful for controlling the regional air pollution. Data from the China Meteorological Administration reported high values of API in 86 Chinese cities during a cold air process. With the cold air passing, the spatial pattern of the air quality changed. Based on the facts, the spatial auto-correlation analysis is adopted. It showed that before the cold air came, there existed spatial auto-correlation of API among the eighty six cities. Moreover, the degree of correlation was influenced by the geographical distance among the cities, the weaker the correlation, the farther the distance. In other words, the cities closer one another were similar on the pollution behaviors and the condition of pollution spreading. However, when the cold air arrived, which was strong enough to affect all cities in the region, the condition of air pollution spillover changed partly. As a result, the original spatial correlation is still maintained. After the cold air passed, the original situation was destroyed. The pollution materials in those ci-ties, of which are serious in air pollution, spread around. It means that the air quality of urban has the cross board spillover.
区分两类攻击行为:反应性与主动性攻击
周广东,
心里发展与教育 , 2014,
Abstract: 反应性与主动性攻击儿童不仅在攻击的原因及功能上不同,二者在社会认知、情绪唤醒、行为表现、同伴关系及父母教养方式上都有区别。反应性攻击儿童有较多的敌意归因偏差及负性情绪,内部心理问题较多,同伴及亲子关系较差;而主动性攻击儿童对攻击的结果期待更为正向,外部行为问题较多,其朋友多有不良行为,父母多采用溺爱的教养方式。另外,文章还分析了二者的发展轨迹及性别差异,指出了当前研究存在的问题及未来的研究方向。
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