搜索结果: 1-15 共查到“知识库 化学 NMR”相关记录186条 . 查询时间(0.026 秒)
Multi-nuclear NMR Studies of DNA Hairpins:2.Sequence-Dependent Structural Variations
GERMANIUM DETERMINATION HYDRIDE GENERATION INDUCTIVELY COUPLED PLASMA EMISSION SPECTROMETRY MEDICINAL PLANT
2016/5/20
The solution conformation of three related DNA hairpins, each with five bases in the loop, is investigated by proton and phosphorus 2D NMR methods. The sequences of the three oligomers are d(CGCGTTGTT...
Multi-nuclear NMR Studies of DNA Hairpins:1. Structure and Dynamics of d(CGCGTTGTTCGCG)
GERMANIUM DETERMINATION HYDRIDE GENERATION INDUCTIVELY COUPLED PLASMA EMISSION SPECTROMETRY MEDICINAL PLANT
2016/5/20
The solution structure of the hairpin formed by d(CGCGTTGTTCGCG) has been examined in detail by a wide variety of NMR techniques. The hairpin was characterized by proton NMR to obtain interproton dist...
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通过对正丁基锂(n-BuLi)/四氢呋喃(THF)引发α-甲基苯乙烯(mSt)负离子本体聚合,验证了n-BuLi缔合体可以引发聚合,形成超分子团聚体,然后在进一步聚合过程中超分子解离.证实了先前提出的负离子聚合的引发机理.通过7Li-NMR对聚合过程的在线检测,进一步证实了mSt在氘代苯为溶剂,THF为调节剂下的负离子聚合以及异戊二烯在非极性条件下的溶液聚合都存在引发剂多元缔合体向二元缔合体转变....
NMR Based Diffusion Pore Imaging by Double Wave Vector Measurements
NMR Diffusion Pore Double Wave Vector Measurements Medical Physics Chemical Physics
2012/5/29
In porous material research, one main interest of nuclear magnetic resonance (NMR) diffusion experiments is the determination of the exact shape of pores. It has been a longstanding ques-tion if this ...
All-atom Molecular Dynamics Simulationsand NMR Spectroscopy Study on Interactions and Structures in N-Glycylglycine Aqueous Solution
All-atom simulation Temperature-dependent NMR N-glycylglycine aqueous solution Hydrogen bond
2012/4/5
All-atom molecular dynamics (MD) simulation and the NMR spectra are used to investi-gate the interactions in N-glycylglycine aqueous solution. Different types of atoms exhibit different capability in ...
Weak intermolecular interactions in gas-phase NMR
Weak intermolecular interactions gas-phase NMR molecular hydrogen isotopomers
2011/8/11
Abstract: Gas-phase NMR spectra demonstrating the effect of weak intermolecular forces on the NMR shielding constants of the interacting species are reported. We analyse the interaction of the molecul...
采用现代核磁共振和模式识别技术,通过分析腹腔注射给药La(NO3)3(2,10和50 mg/kg体重)和Ce(NO3)3(2,10和50 mg/kg体重) 48 h后大鼠血清的核磁共振氢谱,由内源性代谢物浓度的变化研究了两种稀土化合物在大鼠体内的急性生物效应,利用主成分分析法对两者进行了分类比较. 在低剂量(2 mg/kg体重)组La(NO3)3和Ce(NO3)3血清中, 乳酸和肌酸酐等内源性代谢...
运用 1H NMR, 13C NMR, 2D NOESY-NMR及2D ROESY-NMR等多种波谱技术联合表征典型阴离子表面活性剂十二烷基硫酸钠(SDS)与典型水溶性非离子大分子聚乙烯吡咯烷酮(PVP)或聚乙二醇(PEG)间的团簇化作用部位. NMR综合分析结果表明, SDS分子亲水头基邻近的C1~C2片段与PVP分子中内酰胺氮为中心的主链α-C、 五元环上羰基C1(记为P1)及C4(记为P4)...
两种新DTPA衍生物的1H NMR滴定研究
核磁共振 DTPA-BDMA DTPA-BDEA 质子解离过程
2010/1/5
合成了两种新的DTPA双酰胺衍生物,DTPA-BDMA和DTPA-BDEA.通过1HNMR滴定研究发现这两种化合物的质子解离过程为:中部胺基(PH<0.5),端部羧基(0.5<PH<3.1),中部羧基(3.1<pH<5.4),端部胺基(5.4<pH<8.5)和中部胺基(8.5<pH<12.5).在质子解离过程中端部胺基上的一个质子能转位到中部胺基上,同时分子结构将发生较大变化.Gd(DTPA-BD...
离子对水的17O-NMR化学位移和水结构的影响
离子 化学位移 17O-NMR 水的结构
2010/1/5
在小于1 mol•L-1的浓度范围内,测试了碱金属、碱土金属氯化物、卤化钠及其它常见含氧酸盐溶液的17O-NMR化学位移(δ(H217O)).发现离子对δ(H217O)的影响与离子的半径、电荷、离子外层电子结构及离子结构有关.其它离子参数相同时,离子半径越大,离子的摩尔δ(H217O)越大;在电子结构相同的情况下,离子电荷越大,离子的摩尔δ(H217O)越大;多原子离子的摩尔δ(H2...
Structural Analysis of High-Silica Ferrierite with Different Structure-Directing Agents by Solid-State NMR and Ab Initio Calculations
Structural Analysis High-Silica Ferrierite Structure-Directing Agents Solid-State NMR Calculations
2010/9/19
The host-guest interaction in high-silica ferrierite (FER) with different structure-directing agents (SDA), pyridine and piperidine, was analyzed by solid-state 29Si NMR relaxation experiments and mol...
NMR和XAFS方法研究溶液中杯芳冠醚与碱金属离子配位化学
BOC6 BisC6 XAFS MMR
2009/12/25
给出了1,3-二辛氧基杯[4]芳烃冠醚-6(25,27-bis-octyloxy-calix[4]arene-26,28-crown-6, BOC6)和杯[4]芳烃双冠醚-6(1,3-alternate biscrown-6, BisC6)晶体结构参数, 用NMR(CDCl3作溶剂)和XAFS(X-ray absorption fine structure)方法研究了邻硝基苯甲醚(o-nitro-...
27Al和29Si MAS-NMR对Mo/HZSM-5催化剂的研究
Mo/HZSM-5 NMR 脱铝 Al2(MoO4)3 甲烷无氧活化
2009/12/14
27Al和29Si MAS-NMR对Mo/HZSM-5催化剂的研究。
基于LFHB 理论模型关联和预测醇+惰性溶剂的1H NMR 化学位移
1H NMR化学位移 氢键 格子流体理论 醇
2009/12/14
运用含氢键缔合的格子流体状态方程(LFHB), 仅用一个参数关联了一元醇-惰性溶剂共17个体系29套1H NMR化学位移数据. 并且用关联参数成功预测了不同温度下丁醇+环己烷的化学位移. 所得结果与化学缔合理论的结果进行了比较. 对于某些体系在稀浓度范围LFHB的计算氢键缔合度要低于化学缔合理论的结果. 并且分析了LFHB理论中的物理参数和化学参数对于缔合度计算的不同影响.