NMRCOSY and DQF-COSYspin 7/2quadrupolar nucleiAMX and AX2 spin systemsThe two-dimensional nuclear magnetic resonance (NMR) correlation spectroscopy (COSY) and double quantum-filtered COSY (DQF-COSY) spectra of an AMX and an AX2 systems of spins I = 7/2 have been calculated by numerical ...
Derivation of the Rate Equation for Cross-Relaxation Dynamic Processes and Chemical Exchange in NMR 2D NOESY and 2D ROESY Expanding Our View of Coherence: Quantum Mechanics and Spherical Operators Double-Quantum Filtered COSY (DQF-COSY) Coherence Pathway Selection in NMR Experiments The Density Matrix...
limited dynamic range of NMR ADCs, additional solvent suppression has to be performed before digitization (i.e., presaturation). If the DQ filtering is done with pulsed field gradients (PGFs) instead of phase cycling, then this suppresses ...
Advanced NMR Theory: NOESY and DQF‐COSY N Jacobsen 被引量: 0发表: 2007年 Chemical analysis of a new (1→3)-, (1→6)-branched glucan from an edible mushroom, Pleurotus florida On the basis of total hydrolysis, methylation analysis, periodate oxidation, Smith degradation, and NMR studies ...
The 2D NMR COSY and DQF-COSY spectra of an AX system of spins I = 3/2 have been calculated by numerical density matrix calculations. The results are presented in two extreme cases, namely in the slow relaxation regime and in the fast relaxation regime. It is concluded that in addition to...
一般来说,可以通过1H NMR谱、1H-1H COSY谱和TOCSY(HOHAHA)谱推出单糖上各碳上氢的化学位移,然后根据13C NMR谱和1H-13C COSY谱(HMQC谱和HSQC谱)推出碳的化学位移。但是对于不同构型的还略微不同,比如半乳糖构型,因J3.4和J4.5较小,阻碍了交叉峰的出现,可以从1H-1H COSY谱中的交叉峰推出H1,H2和H3。由于H3...
Differential 2D DQF-COSY NMR array eval YM-SDY fungal extract new natural product HTSSchroeder, F CClardy, J
Double-Tuned Isotope-Filtered DQF-COSYPractical, Experimental/ biomedical NMRmagnetisationnuclear magnetic resonance spectroscopyproteins/ human pp60 c-sfc proteinradiofrequency pulseselective suppression13C15Nproton resonancesunlabeled complexed ligandsNot Availabledoi:10.1006/jmrb.1994.1119R.X. Xu...
主要涉及的 NMR 实验方法是:2D 1H-1H NOESY,2D 1H-1H TOCSY、2D 1H-1H DQF-COSY,31p-1H HETCOR图谱,预饱和技术(Presat)压制水峰等。解析出的DNA核磁溶液... 胡中培 - 华中师范大学 被引量: 0发表: 2019年 超快速COSY类2D NMR实验驰豫假峰的抑制 在脉冲梯度场基础上研究了进一步缩短COSY类2DNMR实验数...
NMRDQF-COSY脉冲梯度场t1噪声积算符脉冲相位的不稳定性是导致二维谱中的t1噪声的原因之一.本文从理论上和实验上对脉冲相位不稳定性所引起的t1噪声进行了研究.从角动量算符Ix,Iy和Iz推导中发现,由于磁化矢量在P型和N型DQF-COSY实验的脉冲梯度场中进动方向的内在差异,一部分脉冲相位误差在P型DQF-COSY实验会被重聚掉...