冷缺血时间对不同疾病类型肝组织质量的影响

目的 高质量的肝脏组织样本对肝脏疾病的研究至关重要,冷缺血时间(CIT)是影响组织样本质量的关键因素,探讨冷缺血时间与不同疾病类型肝组织样本质量的相关性,为获得高质量肝组织样本提供标准。方法 选取天津市第一中心医院进行手术治疗的肝癌(HCC)和胆道闭锁(BA)患者各30例,手术切除肝组织后,室温放置0、0.25、0.5、1、2、3、5和6 h后,分别从基因水平、蛋白水平及形态学水平对组织质量进行检测,提取总RNA及基因组DNA,分别检测浓度、纯度及完整性(RIN/DIN值),荧光定量PCR检测组织样本冷缺血0、6 h后ALB基因表达水平;免疫组化方法检测组织样本冷缺血0、6 h后Hep Par1、CK19、CD34、Vimentin蛋白表达情况,Westernblot检测组织样本冷缺血0、6h后ALB蛋白表达水平;HE染色观察组织样本冷缺血0、6 h后组织及细胞形态学变化。结果 DNA产量、RNA纯度和RNARIN随时间变化,时间效应具有统计学意义。组间效应不显著,表明肝癌和胆道闭锁组间没有差异。DNA产量和RNA RIN的交互效应有统计学意义,说明时间的影响随着组别不同而有所不同。与冷缺血0 h相比,肝癌、胆道闭锁组织样本冷缺血6 h后ALB基因表达水平降低,差异具有统计学意义(P <0.05);免疫组化方法检测组织样本冷缺血0、6h后Hep Par1、CK19、CD34、Vimentin蛋白表达情况均无变化,Western blot检测显示组织样本冷缺血0、6 h后ALB蛋白表达水平无显著变化;石蜡切片HE染色显示样本冷缺血0、6 h后组织及细胞形态学无变化。结论 冷缺血时间对肝组织样本中核酸质量具有显著影响,缩短冷缺血时间可获得高质量肝组织样本。

水利工程建设施工合同管理应该注意的问题

对于水利工程项目的施工来讲,施工合同管理工作的重要性不言而喻,其对于提高工程项目建设质量以及保障施工安全具有重要意义。因此,论文以当前水利工程项目建设时合同管理工作的实际状况为基础,对合同管理的相关对策进行探讨,以期全面提升水利工程建设施工合同管理工作的水平。

淫羊藿醇提物及其热裂解产物的挥发性成分研究

目的:研究淫羊藿醇提物的香味成分以及对淫羊藿醇提物进行热裂解产物分析。方法:采用电子鼻对淫羊藿醇提物挥发性成分进行分析;通过正交试验优化淫羊藿醇提工艺;采用热重-气质联用分析仪(TG-GC-MS),模拟卷烟燃烧过程,分析淫羊藿醇提物浸膏在氮气环境中的裂解产物,并对其裂解机制进行推测。结果:各浓度乙醇提取的淫羊藿醇提物共检测出22个挥发性成分,60%浓度的乙醇提取的淫羊藿优于其他浓度;淫羊藿浸膏裂解产物在150、300、450℃共鉴定出78个化合物,包括醛、酮、醇、酚、呋喃类化合物及芳香族化合物等香气成分。结论:淫羊藿醇提物本身含有许多香味挥发性成分,在热裂解后产生大量酮、醇、酚、呋喃类等挥发性香气化合物。

绞股蓝中1个新的葫芦烷型皂苷类化合物

目的对绞股蓝Gynostemma pentaphyllum的总皂苷提取物进行化学成分研究。方法综合应用多种色谱技术进行分离纯化,通过各种现代谱学技术对化合物进行结构鉴定。结果从绞股蓝的总皂苷提取物中分离得到2个葫芦烷型三萜皂苷类化合物,分别鉴定为葫芦素L-2-O-{[a-L-吡喃鼠李糖基-(1→2)][α-L-吡喃阿拉伯糖基-(1→3)]-β-D-吡喃葡萄糖基}-25-O-β-D-吡喃木糖苷(1)、葫芦素L-2-O-[α-L-吡喃鼠李糖基-(1→2)][a-L-吡喃阿拉伯糖基-(1→3)]-β-D-吡喃葡萄糖苷(2)。结论化合物1为1个新化合物,命名为绞股蓝葫芦皂苷A。

Two new phenylpropanoids from Micromelum integerrimum

AIM: To investigate the chemical and bioactive constituents from the stems and leaves of Micromelum integerrimum. METHOD: The chemical constituents were isolated and purified by silica gel, Sephadex LH-20, and HPLC. Their structures were mainly elucidated on the basis of extensive 1D- and 2D-NMR spectroscopy and mass spectrometry. Their cytotoxicity and antimicrobial activities were tested by the SRB and turbidimetric methods, respectively. RESULTS: Two new phenylpropanoids and two known coumarins were obtained, and their structures were identified as microintegerrin A(1), microintegerrin B(2), scopoletin(3), and scopolin(4). All of the compounds were tested for their cytotoxicity against three cancer cell lines(HeLa, A549, and BGC-823) and for antimicrobial activity against the fungus Candida albicans and the bacterium Staphylococcus aureus. CONCLUSION: Two new phenylpropanoids 1 and 2 were isolated and identified from the stems and leaves of M. intgerrimum. None of the compounds showed cytotoxic or antimicrobial activity at the tested concentration of 20 ?g·mL–1.

Quercetin promotes neurite growth through enhancing intracellular cAMP level and GAP-43 expression

The present study was designed to investigate the role of quercetin on neurite growth in N1E-115 cells and the underlying mechanisms. Quercetin was evaluated for its effects on cell numbers of neurites, neurite length, intracellular cAMP content, and Gap-43 expression in N1E-115 cells in vitro by use of microscopy, LANCE? cAMP 384 kit, and Western blot analysis, respectively. Our results showed that quercetin could increase the neurite length in a concentration-dependent manner, but had no effect on the numbers of cells. Quercetin significantly increased the expression of cellular cAMP in a time- and concentration-dependent manner. The Gap-43 expression was up-regulated in a time-dependent manner. In conclusion, quercetin could promote neurite growth through increasing the intracellular c AMP level and Gap-43 expression.