材料期刊网

EFFECTS OF Cr ON THE LONGTIME EMBRITTLEMENT OF ALLOY 718

J.F. Radavich(Materials Department , Purdue University , West Lafayette , IN 47907 , USA Manuscript received 26 August 1996)

金属学报(英文版)

关键词:

One-Pot Four-Component Dakin-West Synthesis of β-Acetamido Ketones Catalyzed by a Vanadium-Substituted Heteropolyacid

催化学报 doi:10.1016/S1872-2067(11)60379-3

关键词:

Stress Corrosion Cracking of X80 Pipeline Steel in Near-Neutral pH Environment under Constant Load Tests with and without Preload

材料科学技术（英文）

Constant load tests in NS4 solution purged with N(2)-5%CO(2) gas mixture were conducted on American Petroleum Institute (API) X80 pipeline steel applied in the 2nd West-East Gas Pipeline project with and without preload. The results show that cracks could initiate and propagate in X80 pipeline steel in near-neutral pH environment under a constant load condition. The life of crack initiation and propagation increased with decreasing applied stress. Preload did not change its corrosion behavior obviously. However, preload reduced the time for crack initiation.

关键词: Stress corrosion cracking;X80 pipeline steel;Near-neutral pH solution;Preload;soil environment;groundwater;initiation;behavior

Ce4+对不同培养时期红豆杉细胞p-ERK-like的影响

葛志强 , 王莹

中国稀土学报

为了探究培养生长不同时期的红豆杉细胞对Ce4+应答差异的机制,采用west-Blot免疫印迹法考察了1 mmol·L-1 Ce4+对培养不同时期的红豆杉细胞的细胞外信号调节蛋白激酶磷酸化(p-ERK-like)的表达变化.结果发现,悬浮培养的红豆杉细胞基础p-ERK-like的表达在整个培养周期中呈"M"型变化,分别在培养第五天和第二十一天出现两个高峰,而培养第十一天达到低谷,仅为参比值的77%.在培养的不同时间点应用Ce4+诱导后,细胞的最大p-ERK-like表达量以及到达最大量所需的时间表现出显著的差异,培养第十一天的细胞经Ce4+诱导后其p-ERK-like表达速率达高峰.结果表明,处于不同培养时期的红豆杉细胞其p-ERK-like表达存在显著差异,这可能是导致不同培养时期细胞对Ce4+产生不同应答效应的一个因素.

关键词: 铈 , ERK-like激酶 , 红豆杉细胞 , 悬浮培养 , 稀土