Enzymatic formations of adrenaline and other catechols from monophenols

An enzyme that forms adrenaline from p- and m-sympathol and dopamine from p- and m-tyramine is localized in the microsomes of rabbit liver and requires the reduced form of nicotinamide adenine dinucleotide phosphate. The enzyme is nonspecific and can form catechols from the following normally occurring and foreign phenols: p- and m-octopamine, p-hydroxyephedrine, phenol, stilbestrol, N-acetyl-p-aminophenol, estradiol and N-acetylserotonin.     

中粗砂地层大型定向穿越工程施工工艺

抚河φ1 016管道穿越工程地层主要为中粗砂层及砾砂层,地下水丰富,地层无胶结质、整体性差,孔壁稳定性差,大口径定向钻进施工具有相当大的风险.基于此,充分分析了施工层位地质状况,结合以往施工经验确定了该工程采用四级扩孔程序,泥浆选用优质复合型非开挖专用膨润土,并添加高分子纤维素进行增效处理.实践表明,通过分析地层资料、合理设计施工程序、优化选取泥浆参数以及实时控制施工过程,可有效提高水平定向钻进在同类地层施工中的一次成功率.     

Carbon-13--rich diagenetic carbonates in miocene formations of california and Oregon

Carbon unusually rich in C(13)(deltaC(13) = +5.4 to +19.0 per mil relative to the Peedee belemnite carbonate standard of the University of Chicago) is characteristic of certain diagenetic limestones and dolomites in the Miocene Monterey Shale of California and the Nye Mudstone of Oregon. This heavy carbon may have originated through low-temperature equilibration between CO(3)- - and CO(2) in migrating carbonated waters or between CH(4) and CO(2) in natural gas. Light carbon (deltaC(13) = -5.6 to -18.2 per mil) derived through nonequilibrium oxidation of organic matter also occurs in the carbonate of Monterey Shale in some localities, but at most places it is much less common than heavy carbon.