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Search Results: 1 - 10 of 36177 matches for " 常翠青 "
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山楂总黄酮对人血管内皮细胞的作用
,陈吉棣
中国公共卫生 , 2002, DOI: 10.11847/zgggws2002-18-04-03
Abstract: ?目的探讨山楂总黄酮对人血管内皮细胞的保护作用及其机理.方法通过原代培养人脐静脉内皮细胞(EC),从细胞形态学、细胞生长状况、细胞内乳酸脱氢酶(LDH)释放、内皮细胞对单核细胞(MC-EC)的粘附作用,以及低密度脂蛋白脂质过氧化(TBARS值)测定等,观察不同剂量(25,50,100mg/L)山楂总黄酮对氧化型低密度脂蛋白(oxLDL)诱导的EC损伤的影响和对EC的直接作用.结果oxLDL对EC具有明显的损伤作用,oxLDL组的细胞生存率低于正常对照组(P<0.05),LDH释放率和MC-EC粘附率均高于正常对照组(P<0.05);山楂黄酮可以有效地抑制oxLDL对EC的损伤,3个剂量的山楂黄酮+oxLDL组的细胞生存率均显著高于oxLDL组(P<0.05),LDH释放率、MC-EC粘附率和TBARS值均显著低于oxLDL组(P<0.05),呈剂量-效应关系.单纯山楂黄酮组的中、高剂量组MC-EC粘附率均显著低于正常对照组(P<0.05).结论山楂黄酮可以有效地保护内皮细胞免受oxLDL的损伤,其机理与山楂黄酮的抗氧化作用和对EC的直接作用有关.
幂律流体撞击式射流破碎特征试验
Experiment on the Breakup Characteristics of Impinging Jets of Power Law Fluid

,,马永,白富强,,,陈世兴
- , 2016, DOI: 10.11784/tdxbz201410038
Abstract: 基于自行搭建的撞击式射流系统,采用高速摄影技术研究了非对称条件下幂律流体黏度对撞击式射流破碎 特征的影响规律.结果表明:随着幂律流体黏度的增加,射流破碎模式种类增加;除弓形液线模式外,其余模式开 始出现的速度与流体黏度成正比;在射流速度v 较低时,破碎长度Lbu 与流体黏度成反比;两股不同黏度流体撞击 时,Lbu随v 呈“双峰模式”且在较高v 时与流体黏度成正比;相同黏度撞击时,则呈“单峰模式”且在较高v 时Lbu最 大;喷雾锥角α 随v 增加而增大,最后趋于的稳定值与流体黏度成反比;v 较高时,α 与流体黏度成反比.
Based on self-built impinging jet system,high-speed photographing technology was used to study the effect of power law fluid viscosity on the breakup characteristics in asymmetric impinging jets. The results indicate that with the increase of the viscosity of power law fluid,the categories of spray patterns increase;the velocity in which each spray pattern occurs is proportional to the viscosity of fluid,except for bow-shaped pattern. At lower jet velocity v,breakup length Lbu is inversely proportional to the fluid viscosity. In case of impingement of two jets with different viscosities,Lbu is in a bimodal pattern and proportional to the viscosity of fluid in a range of higher velocity;in the case of the impingement of two jets with the same viscosity,Lbu is in a unimodal pattern and reaches the largest value in the range of higher velocity. The spray cone angle α increases with the increment of v and then tends to arrive at a stable value,which is inversely proportional to the fluid viscosity;in the range of higher velocity,α is inversely proportional to fluid viscosity
皱纹盘鲍(haliotisdiscushannai)微卫星dna的筛选与引物设计
曹洁,,丁君,孙效文,,贾智英
农业生物技术学报 , 2006,
Abstract:
栉孔扇贝bes-ssr的开发及遗传多样性分析
张秀英?,张晓军?,,,郇 聘?,李富花?,相建海?
水产学报 , 2012, DOI: 10.3724/SP.J.1231
Abstract: 通过分析栉孔扇贝bac末端序列,发现大量微卫星dna;随机选择14个多态性bes-ssr标记,在我国栉孔扇贝大连群体(dl)和青岛群体(qd)中验证标记的可用性,同时对这两个群体的遗传结构及其分化进行研究。结果表明,从17447条bess中得到微卫星3374个,以四核苷酸重复为主(26.6%),五核苷酸重复次之(17.7%),六核苷酸重复最少(12.0%)。bes-ssr引物的扩增效率为77.3%(99/128),在作图亲本中的多态比例为33.6%(43/128),14个基因座在两群体中的平均等位基因数na分别为18.9286和26.2143,平均有效等位基因数ne为11.7505和17.0891,平均观察杂合度ho为0.5100和0.4204,平均期望杂合度he为0.9156和0.9450,多态信息含量pic分别为0.8940和0.9302,群体遗传多样性水平较高。两群体间的无偏遗传相似性系数为0.4879,遗传距离为0.7177,平均基因分化指数fst为0.0243,基因流nm为10.0179,显示群体间遗传分化程度较弱,遗传变异主要来自于群体内个体之间,经hardy-weinberg平衡检验,两群体普遍存在杂合子缺失现象。研究表明,所开发的bes-ssr是高度多态位点,用于群体遗传多样性分析效果很好,显示bes是微卫星标记开发和应用的重要资源。
数字图书馆信息资源共享系统的风险防范机制研究
,
情报资料工作 , 2012,
Abstract: ?文章首先对数字图书馆信息资源共享系统建设中出现的各种风险状况进行了分析,提出要树立风险意识,提高风险的判别能力,建立危机预警和响应体系,构建信息资源共享系统的风险防范机制。
著作权问答

中国科技期刊研究 , 1995,
Abstract:
著作权问答

中国科技期刊研究 , 1995,
Abstract:
Effects of Delayed Feeding on Ingestion,Growth and Survival of Misgurnus anguillicaudatus Larvae
延迟投饵对泥鳅仔鱼摄食、生长和存活的影响

QIAO Zhi-gang,CHANG Yan-li,KANG Qing-juan,LIU Xiao-cui,MA Long,
乔志刚
,艳利,,刘晓,马龙

水生态学杂志 , 2012,
Abstract: Effects of delayed initial feeding on ingestion,growth and survival of oriental weatherfish(Misgurnus anguillicaudatus) larvae were investigated under the condition of water temperature of(27±1)℃,different initial feeding time being 0,1,2,3,4,5,6,7 days delayed,and M.anguillicaudatus being starved.The results showed that the larvae of oriental weatherfish opened mouth 3 days of age,mix of nutrition period was 2 days,and complete yolk sac absorption was 4 days of age.The initial feeding rate was 36%;the highest initial feeding rates reached 98%,oriental weatherfish 5 days of age.The point of no return(PNR) of starvation was in 8th-9th day after hatching.The body length of oriental weatherfish larvae of 0 day and 1 day groups of delayed feeding indicated constant growth,with no significant difference(P>0.05)between two groups till 11 days.With the days of delayed feeding increasing,the growth rate of M.anguillicaudatus larvae obviously decreased.The M.anguillicaudatus larvae under the absolutely starved condition indicated positive growth between 3days old and 5 days old,but subsequently appeared negative growth.At the age of 11 days,the survival rates of the larvae of delayed feeding of 0 day and 1 day were separately 82.67% and 89.33%,and there were no significant difference(P>0.05).With feeding days of delayed feeding rising,on the 11th day,the survival rates of the larvae obviously reduced,while all the larvae died in the starvation group.
The effect of temperature on growth and development in larval pond smelt Hypomesus olidus
温度对池沼公鱼仔鱼生长发育的影响

lI Xiao zhu,CHANG Yan ling,KANG Qing juan,LIU Xiao cui,QIAO Zhi gang,
李孝珠
,艳利,,刘晓,乔志刚

水生态学杂志 , 2011,
Abstract: 温度对池沼公鱼(Hypomesus olidus)仔鱼的生长和发育的影响研究表明:水温12±0.5℃、16±0.5℃和20±0.5℃条件下,池沼公鱼仔鱼均能正常生长发育;随温度升高仔鱼全长生长加快、卵黄囊和油球吸收变快。在12℃~20℃温度范围内,温度每变化4℃,仔鱼的全长、卵黄囊和油球变化差异显著(p<0.05)。当温度达到24℃时,仔鱼卵黄囊和油球不能正常吸收,生长受到抑制,与其它三组相比差异显著(p<0.05)。研究认为:水温12℃~20℃范围内,池沼公鱼仔鱼可以正常生长。
基于当前统计模型的地图匹配车辆跟踪研究
高 晖,
中国公路学报 , 2006,
Abstract: ?为提高车辆跟踪系统的精度,减小差分全球定位系统(DGPS)的定位误差,通过分析行驶在城市道路上的车辆运动过程及其相应的运动模型,提出采用当前统计模型作为车辆运动模型。通过地图辅助位置择近和速度择角算法来修正卡尔曼滤波,为运行在道路上的车辆确定地图匹配估计。实际运行结果表明:整个车辆跟踪系统的精度有明显的提高。
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