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2 Basis Principles of FT NMR C Gerd Gemmecker 1999 Nuclei in magnetic fields Atomic nuclei are composed of nucleons, i.e., protons and neutrons. Each of these particles shows a property named\spin\(behaving like an angular momentum) that adds up to the total spin of the
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5 Heteronuclear Correlation Spectroscopy H.C-COSY We will generally discuss heteronuclear correlation spectroscopy for x =C(in natura abundance!), since this is by far the most widely used application. However, all this can also be applied to other heteronuclear spins, like 3P, 5N, 1%F,etc In the heteronuclear case, there are some important differences that allow to
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6 The noe effect c Gerd Gemmecker, 1999 Nuclear OVERHAUSER Effect(NOE): resonance line intensity changes caused by dipolare cross- relaxation from neighbouring spins with perturbed energy level populations To understand the nature of the NOE, we have to look at a two-spin system I' and
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NMR supplement Kinetic studies of protein folding using NMR spectroscopy Christopher M. Dobson and Peter J Hore Recent progress has advanced our abilities to use NMR spectroscopy to follow- in real time -the structural and dynamic changes taking place during protein folding
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PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY ELSEVIER Progress in Nuclear Magnetic Resonance Spectroscopy 38 (2001) 325-360 www.elsevier.nl/locate/pnmrs NMR quantum computation J.A. Jonesa,b,* \Oxford Centre for Molecular Sciences. New Chemistry Laboratory South Parks Road, Oxford OXI 3QT. UK
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NMR screening in drug discovery Jonathan M Moore NMR methods in drug discovery have traditionally been used drugs. Many pharmaceutical industry research groups have to obtain structural information for drug targets or embarked on drug discovery programs using NMR screen-
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河流本身有一定渔业价值,同时又是许多湖泊、水 库、池沼的水源,对后者的非生物环境和生物群落都有重要的影响。 我国河流众多,江河总面积约占内陆水域总面积 的45%。其中内流河多分布于西北地区,以湖泊为尾闾最后消失在陆地上,外流河系多分布于东部地区。源于青藏高原东南侧者多为源远流长的巨河大川。如黄河、长江、怒江、澜沧江、雅鲁藏布江等,分别注入太平洋和印度洋;缘于我国中部第二阶梯的有黑龙江、辽河、海河、淮河、西江等;缘于东部沿海第三阶梯的河流有鸭绿江、闽江、瓯江等河流流程较短
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1.什么是富营养化? 富营养化现象很早就有,我们可以从古代书藉中 找到一些线索。关于富营养化的第一个确实的、 科学的观察应在19世纪20年代。当时瑞士的莫 尔登湖(Murten see)湖水变成红褐色。周围居民 认为是二百多年前德瑞战争中法国土兵血迹的回 溯
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草本,灌木或乔木,常有刺及明显的皮孔。 叶互生,稀对生,单叶或复叶,托叶常附生于叶柄上 而成对。 花两性,辐射对称,花托凸隆或凹陷, 花被与雄蕊常愈合成1碟状、钟状杯状、坛状或圆筒 状的花筒( floral tube或 hypanthium),此花筒常被 称为萼筒或花托筒,花萼、花冠和雄蕊看起来从花筒
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水质化学性状指标和微生物学性状指标:三氮、三氧、细菌总数、总大肠菌群 水体污染对健康的危害:生物性污染的主要危害一介水传染病的流行 化学性污染的危害(重点介绍水俣病、痛痛病);
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