P87C591在机舱监测报警系统中的应用

简述CAN现场总线和P87C591单片机的特点以及它们的优越性,详细介绍了基于P87C591单片机的机舱监测报警系统中监测报警点硬件电路的设计及要注意的问题,给出了节点初始化流程图.     

PG-82改性沥青掺加化学纤维混合料碾压控制

介绍了京珠南高速公路扩建罩面工程PG-82改性沥青掺加化学纤维中、上沥青面层碾压施工工艺的研究。     

Hypoxia-induced enhancement of cell invasiveness in SMMC7721 hepatocellular carcinoma cells

Objective To explore the effects of hypoxia (1% O2) on the ability of cell invasiveness and expression of KAI1/CD82 in SMMC7721 hepatocellular carcinoma cells. Methods SMMC7721 hepatocellular carcinoma cells were cultured by hypoxia ( 1% O2) in vitro, and the ability of cell invasiveness was analyzed by cell invasion assay.Immunohistochemistry staining technique was used to evaluate the protein expression of KAI1/CD82. Results Cell invasion assay revealed that hypoxia enhanced the ability of invasiveness of hepatocellular carcinoma cells. In addition,KAI1/CD82 protein expression was positive in cultured SMMC7721 hepatocellular carcinoma cells, and it was located diffusedly in the cytoplasm and on the membrane. KAI1/CD82 protein expression was down-regulated when mediated by hypoxia; at the same time, it showed a time-effect relationship. Conclusion Hypoxia can enhance invasiveness of hepatocellular carcinoma cells. The down-regulation of KAI1/CD82 expression may play a certain role in those courses.     

KAI1/CD82、E-Cadherin在宫颈鳞癌组织中的表达及其意义

目的探讨KAI1/CD82、E-Cadherin在宫颈鳞癌中的表达及其意义。方法采用免疫组化S-P法分别检测KAI1/CD82、E-Cadherin在10例正常宫颈组织、15例不典型增生宫颈组织及64例宫颈鳞癌中的表达,分析其表达结果与临床病理特征的关系。结果随着从正常宫颈组织→宫颈不典型增生组织→宫颈鳞癌的转化,二者的阳性表达率呈递减趋势。在宫颈鳞癌中的表达率明显低于正常组织和不典型增生组织(P<0.05),而正常组织与宫颈不典型增生组织之间无显著性差异(P>0.05)。二者在宫颈组织中的表达呈正相关,且二者在宫颈鳞癌中的共表达下调与淋巴结转移明显相关。结论KAI1/CD82可能与膜蛋白E-Cadherin相互作用抑制宫颈鳞癌的淋巴结转移;E-Cadherin基因、肿瘤自身的特性以及多种基因相互作用可能在宫颈鳞癌的转移中起着更为关键的作用。     

稀土固体超强酸S_2O_8~(2-)/ZrO_2-La_2O_3催化合成柠檬酸三丁酯

以柠檬酸和正丁醇为原料,在稀土超强酸S2O82-/Zr O2-La2O3的催化下合成柠檬酸三丁酯。通过XRD和红外光谱确定了稀土元素La的掺量对催化剂结构的影响,用正交优化实验优化了催化剂用量、酸醇摩尔比、反应时间等对酯化率的影响。实验结果表明:La掺量为0.07 mol·L-1所得催化剂性能最佳,柠檬酸三丁酯最优催化合成条件为反应温度175℃,醇酸摩尔比4.0∶1,催化剂用量为柠檬酸质量的2.0%,反应时间180 min,酯化率可达98.27%。催化剂可循环使用5次而不会明显降低活性。经折光率、红外光谱、核磁共振氢谱和碳谱测定,所合成产物为柠檬酸三丁酯。