管棚保护下框架桥顶进工程高程控制分析

大直径管棚保护下直接顶进预制箱涵技术是近年来国内发展起来的一种全新的施工技术,但其难度大,理论发展不完善,可借鉴的经验少.依托南昌市新龙岗大道下穿向莆铁路工程,根据实际工程情况建立力学分析模型,计算框架桥下钢管的受力,并根据钢管的受力情况假定钢管为Winkler弹性地基梁,运用弹性地基梁理论建立钢管挠曲微分方程并求解该微分方程,从而计算出框架桥顶进过程中的钢管挠曲变形,进而确定顶进过程中框架桥高程偏差情况.理论分析表明,底排管棚的支撑和引导作用有助于框架桥推进,并能有效遏制框架桥\"栽头\"和\"抬头\"现象,对于现场工程施工具有很好的参考价值.福建省自然科学基金(2014J01208

探针熔解分析法快速检测结核分枝杆菌链霉素耐药突变

目的评价探针熔解分析法快速检测结核分枝杆菌链霉素耐药突变的应用价值,为临床应用提供依据。方法首先用中国药品生物制品检定所提供的含37份标准非结核分枝杆菌的标准盘进行特异性评价,然后将野生型结核分枝杆菌H37Rv基因组DNA梯度稀释进行灵敏度考察,最后对906株结核分枝杆菌临床分离株(其中37份有药物敏感性试验结果)的链霉素耐药相关基因进行检测,并对突变菌株、有药敏结果的菌株以及疑似杂合的菌株进行测序分析。结果标准盘评价结果证实该体系特异检测H37Rv结核分枝杆菌。分析灵敏度为5～50拷贝每反应。在所有的906份结核分枝杆菌培养标本中,103份标本发生突变且与测序结果一致,18份标本存在杂合信号,17份标本无信号。37份有药敏结果的标本中,敏感的标本用探针熔解分析法所得结果均为野生型,耐药的16份标本仅检测到7份突变,另有9份耐药的标本实时检测为野生型,与测序结果相符。结论探针熔解分析技术特异性好,可以快速、准确地检测结核分枝杆菌链霉素耐药常见突变,有望直接用于临床标本链霉素耐药性检测

氧化石墨烯改性高温环氧树脂基碳纤维复合材料的热性能与力学性能

采用湿法预浸技术和模压工艺,制备了氧化石墨烯(GO)改性碳纤维/环氧树脂(CF/E54-DDS)混杂复合材料,利用差示扫描量热分析(DSC)、动态热机械分析(DMTA)、无损C扫描等开展了GO对复合材料的热固化性能、凝胶工艺性、动态热机械性能以及抗冲击损伤性能等的影响研究。结果表明,GO结构中的羟基、羧基会促进改性树脂体系的固化反应,GO/E54-DDS的固化反应比E54-DDS的提前,反应变得和缓,且会加速固化反应的进行;在GO含量小于0.5%时,GO的活性基团可增加改性体系的交联密度而提高复合材料的玻璃化转变温度,但GO含量大于0.8%时,会因DDS在固化网络结构中的占比下降较大,反而降低复合材料的玻璃化转变温度;GO/CF/E54-DDS预浸料比CF/E54-DDS表现出更好的浸润效果;CF/E54-DDS复合材料破坏后碳纤维表面光洁,破坏主要发生在碳纤维与树脂基体的界面,而GO/CF/E54-DDS复合材料破坏后,碳纤维表面紧密粘附着GO/E54-DDS固化物,破坏主要发生在碳纤维织物层间的GO/E54-DDS区域;GO的存在提高了GO/CF/E54-DDS复合材料抵抗横向裂纹和纵向裂纹扩展的能力,复合材料的损伤投影面积和凹坑深度减小,提高了冲击后压缩强度。航空科学基金(2016ZF68011);;福建省科技创新平台建设计划(2014H2006);;福建省自然科学基金(2015J01222);;厦门大学石墨烯工业技术研究院资助项目(2014I2005

Effect of geniposide on the lipid metabolism and inflammatory injury of nonalcoholic fatty liver disease in the hamster

目的:观察栀子苷对高脂饮食诱导的金黄地鼠非酒精性脂肪性肝病模型脂质代谢、肝组织病理变化及炎症损伤的影响,并与栀子进行比较,以明确栀子抗脂肪肝作用的效应成分。方法:24只雄性金黄地鼠按随机数字表法分为正常组、模型组、栀子组和栀子苷组。实验后观察肝组织病理学变化,并检测肝组织Tg含量、血清Tg、CHO含量及AlT、AST活性。结果:与模型组比较,栀子组、栀子苷组肝Tg含量、血清Tg、CHO含量及AlT、AST活性均显著降低,且栀子苷对AlT、AST活性的降低作用优于栀子。结论:栀子苷与栀子对高脂饮食诱导的地鼠脂肪肝均有显著干预作用,且栀子苷抗炎症损伤作用优于栀子。Objective: To observe geniposide's effect on lipid metabolism,hepatic tissue pathological change and inflammatory injury of golden hamsters with nonalcoholic fatty liver disease( NAFLD),caused by high fat diet.Compare the geniposide's effect with gardenia to make clear the effective components in Gardenia that can resist fatty liver.Methods: 24 male golden hamsters were averagely divided into control group,model group,gardenia group and geniposide group.The experiment was based on building the model,and then observe hamsters 'general condition and pathological change of hepatic tissue,examine the content of hepatic tissue TG,serum TG,CHO and the activity of ALT,AST.Results: In gardenia group and gardenoside group,The content of hepatic tissue TG,serum TG,CHO and the activity of ALT,AST are significantly lower than the model group.Besides,gardenoside can lower the activity of ALT,AST better than gardenia.Conclusion: Both gardenoside and gardenia have notable intervention effects on hamsters' NAFLD caused by HFD and gardenoside have better effects on resisting inflammatory injury than gardenia,which suggested that gardenoside was the primary effective component in resisting NAFLD.国家自然科学基金面上项目(81274155); 厦门市重大科技计划项目(3502Z20100006

Jiangzhi and Hepatoprotective effect of salidroside on nonalcoholic fatty liver disease

目的:探讨中药红景天的主要成分红景天苷对高脂饮食诱导的金黄地鼠非酒精性脂肪性肝炎(nASH)的干预作用。方法:18只雄性金黄地鼠随机分成正常组、模型组和红景天苷组,除正常组外,其余两组均给予高脂饮食喂养6周以复制nASH模型;造模第3周起,红景天苷组给予红景天苷药液灌胃4周。6周后处死地鼠,收集标本,检测肝组织甘油三酯(Tg)含量,血清天门冬氨酸氨基转移酶(AST)活性,对肝组织进行HE染色。结果:红景天苷能明显降低肝组织Tg含量及血清AST活性,改善肝组织脂肪变性的病理状态。结论:红景天苷具有显著的抗nASH病理损伤的药理效应。Objective:To explore the intervening effect of the main components of the rhodiola on the nonalcoholic fatty liver disease(NAFLD) for male golden hamsters induced by high-fat diets.Methods:Total 18 male golden hamsters were divided into control group,model group and salidroside group randomly.Male golden hamsters in the model group and salidroside group were fed with high fat diet for 6 weeks to reproduce NAFLD model.After the second week of feeding,male golden hamsters in the salidroside group were given a gavage of salidroside.All male golden hamsters were put to death at the 6 weeks and samples were collected.Hepatic tissue TG contents were detected.Serum AST activities were determined.Hepatic tissues were detected by HE staining.Results:Salidroside decreased hepatic tissue TG contents,serum AST activities and reduced the fatty degeneration in hepatocytes significantly.Conclusion:Salidroside has conspicuous pharmacological effect on the nonalcoholic fatty liver disease in male golden hamsters.国家自然科学基金(No.81274155); 厦门市重大科技计划项目(No.3502Z20100006); 横向课题(No.XDHT2011366A)~

Mechanism of geniposide in improving free fatty acid metabolism in rats with non-alcoholic fatty liver disease

观察栀子苷改善非酒精性脂肪性肝病的效果,从游离脂肪酸探讨栀子苷调节非酒精性脂肪性肝病的作用机制。健康雄性Wistar大鼠40只,随机分为4组:正常组、模型组、栀子苷组和血脂康组,每组大鼠10只,正常组大鼠给予正常大鼠饲料喂养,其余3组大鼠均采用高脂饲料喂养以诱导非酒精性脂肪性肝病,造模时间为8周,从第5周起至第8周末,栀子苷组和血脂康组分别灌服相应的药物。记录大鼠体重、肝湿重、脂肪质量;用相应方法检测肝组织TG,FFA,FAS,AMPK,ACCase及Malonyl-Co A含量,血清CHO,LDL-C的含量,血清AST,ALT的活性;观察肝脏组织肉眼及病理变化(HE染色法)。结果显示,与正常组相比,模型组大鼠的体重;肝湿重;脂肪重;血清CHO,LDL-C,ALT,AST;肝组织TG,FFA,FAS,ACCase及Malonyl-Co A含量皆显著升高(P<0.01);肝组织AMPK活性显著降低(P<0.01),肝组织肉眼外观及病理切片脂肪变性明显,并出现炎症损伤;与模型组相比,栀子苷组大鼠体重、脂肪质量、肝组织FFA含量、血清ALT,AST活性均显著降低(P<0.01),肝湿重,肝组织TG,FAS,ACCase及Malonyl-Co A含量明显降低(P<0.05),肝组织AMPK活性明显增多(P<0.05),肝脏肉眼外观及病理学表现均有所改善;与模型组相比,血脂康组大鼠的肝湿重、脂肪质量、肝组织TG,FFA和血清LDL-C水平明显降低(P<0.05);与血脂康组相比,栀子苷组大鼠的体重、脂肪质量、肝组织FFA含量均显著降低(P<0.01),其他方面无明显差异。结果表明,栀子苷具有显著的改善高脂饮食诱导的大鼠非酒精性脂肪性肝病的药理效应;其改善大鼠非酒精性脂肪性肝病的游离脂肪酸代谢是通过调节"AMPK-ACCase-Malonyl-Co A-FFA"轴来实现的。To observe the effect of geniposide on non-alcoholic fatty liver disease( NAFLD),and discuss the mechanism of geniposide for NAFLD from the aspect of free fatty acid,forty healthy Wistar male rats were randomly divided into normal group,model group,geniposide and Xuezhikang group. The rats in normal group were fed with normal diets,and the rats in other 3 groups were given with high-fat diet for 8 weeks to induce the NAFLD models. From the week 5 to end of week 8,the rats in geniposide and Xuezhikang group were intervened with corresponding medicines. The body weight,liver wet weight,and fat weight of the rats were recorded.Visual and pathological changes in hepatic tissues were observed with HE staining. The contents of TG,FFA,FAS,AMPK,ACCase and Malonyl-Co A in hepatic tissue,contents of CHO and LDL-C in serum and activities of AST and ALT in serum were detected by using corresponding methods. The results showed that the body weight,liver wet weight,and fat weight of the rats,CHO,LDL-C,ALT and AST levels in serum,TG,FFA,FAS,ACCase and Malonyl-Co A levels in hepatic tissues of the rats in model group were significantly higher than those in normal group( P < 0. 01),while AMPK activity was significantly lower than that of the normal group( P < 0. 01),with obvious visual and pathological steatosis in hepatic tissues,and inflammatory injury occurred in model group. Compared with the model group,body weight of the rat,fat weight,levels of FFA in hepatic tissues,ALT and AST activities in serum,liver wet weight,TG,FAS,ACCase and Malonyl-Co A levels were significantly decreased in geniposide group( P < 0. 01),while the AMPK activity in hepatic tissues was significantly increased( P < 0. 05),with improvement in visual and pathological performance.Compared with the model group,liver wet weight,fat weight,TG and FFA levels in hepatic tissues,and LDL-C level in serum were significantly decreased in Xuezhikang group( P < 0. 05). Compared with Xuezhikang group,the body weight of rat,fat weight and FFA level in hepatic tissues were significantly lower in geniposide group( P < 0. 01),but with no significant difference in other aspects. These findings indicated that geniposide was highly effective in improving the pharmacological effect of NAFLD induced by highfat diet,and the mechanism was achieved through AMPK-ACCase-Malonyl-Co A-FFA axis.国家自然科学基金项目(81274155;81503529);; 福建省自然科学基金项目(2014J01374);; 福建省高等学校新世纪人才计划项目;; 厦门市科技计划项目(3502Z20134020);; 福建省中医药科研项目(WZPW201308

Spatial distribution and correlation of environmental factors andchlorophyll a concentrations in the Bohai Sea during the summer of 2013

通过对2013年7月渤海海域26个站点温度、盐度、营养盐及叶绿素a(Chl a)浓度的空间分布特征及其相关性进行了分析,发现:受渤海水深和夏季陆源河流输入影响,近岸水域表现出明显的高温、低盐与高营养盐特征,且垂直变化特征不显著;在水深较深的辽东湾湾口和渤海海峡,海水呈现明显的层化现象,表层水温高于中底层,而表层盐度与营养盐浓度则低于中底层。营养盐结构分析表明,渤海夏季磷酸盐浓度存在显著的绝对与相对限制,而受河流输入影响,硅酸盐的相对限制得到显著缓解。表层Chl a浓度的高值区位于滦河及复州河河口附近海区,中层与底层的高值区则出现在滦河与黄河口附近。Chl a浓度与环境因子的相关性分析表明,盐度..

厦门市碘缺乏病防治现状与对策

[目的]了解碘缺乏病防治现状,探讨今后防治措施与策略。[方法]采用容量比例概率法抽查学生甲状腺大小、尿碘、盐碘,开展加工厂盐、居民户盐及盐民自用盐的盐碘含量监测。[结果]查2525名8～10岁学生,甲状腺肿大率为3.72%(触诊法),自1995年以来呈逐年下降趋势,合格碘盐食用率89.66%,碘盐覆盖率90.72%,尿碘中位数为246.40μg/L;加工厂盐合格率为99.15%,居民户碘盐覆盖率为95.25%、合格碘盐食用率为94.10%,盐民自供盐10月份后合格碘盐食用率已达到90%以上。[结论]我市继续保持在实现消除碘缺乏病阶段目标,但今后应坚持开展病情监测和坚持防制措施不松懈

Diatom diet selectivity by early post-larval abalone Haliotis diversicolor supertexta under hatchery conditions

Benthic diatoms constitute the primary diet of abalone during their early stages of development.To evaluate the dietary preferences of early post-larval abalone,Haliotis diversicolor supertexta,we analyzed the gut contents of post-larvae that settled on diatom films.We compared the abundance and species diversity of diatom assemblages in the gut to those of the epiphytic diatom assemblages on the attachment films,and identified 40 benthic diatom species in the gut contents of post-larvae 12 to 24 d after settlement.The most abundant taxa in the gut contents were Navicula spp.,Amphora copulate,and Amphora coffeaeformis.Navicula spp.accounted for 64.0% of the cell density.In the attachment films,we identified 110 diatom species belonging to 38 genera.Pennate diatoms were the dominant members including the species Amphiprora alata,Cocconeis placentula var.euglypta,Cylindrotheca closterium,Navicula sp.2,and A.coffeaeformis.Nano-diatoms(<20 μm in length) accounted for a considerable proportion of the total species..