Suppr超能文献

固态核磁共振中P脉冲幅度不足对C检测PC旋转回波双共振测量的影响。

Effects of insufficient P pulse amplitudes on C-detected PC rotational-echo double-resonance measurements in solid state NMR.

作者信息

Larimi Motahareh G, Tycko Robert

机构信息

Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0520, USA.

Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0520, USA.

出版信息

J Magn Reson. 2025 Aug;377:107908. doi: 10.1016/j.jmr.2025.107908. Epub 2025 May 28.

DOI:10.1016/j.jmr.2025.107908
PMID:40472712
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12245571/
Abstract

We investigate the effects of insufficient P pulse amplitudes on C-detected PC Rotational-Echo Double-Resonance (REDOR) measurements in a 17.5 T magnetic field. Experimental REDOR data on two compounds show that normalized REDOR difference signals ΔS/S are suppressed when the amplitudes of P π pulse trains are not very large compared with the P chemical shift anisotropies. This behavior is explained theoretically by an analysis of the effects of imperfections in π pulse rotations due to the orientation-dependent and time-dependent resonance offsets under magic-angle spinning in REDOR measurements. We show that effects of the same pulse imperfections can be observed directly by measurements of an effective relaxation time [Formula: see text] for longitudinal P spin polarization under identical π pulse trains.

摘要

我们研究了在17.5 T磁场中，P脉冲幅度不足对C检测的PC旋转回波双共振（REDOR）测量的影响。两种化合物的实验REDOR数据表明，当P π脉冲序列的幅度与P化学位移各向异性相比不是很大时，归一化的REDOR差异信号ΔS/S会受到抑制。通过分析REDOR测量中魔角旋转下由于取向依赖性和时间依赖性共振偏移导致的π脉冲旋转不完美的影响，从理论上解释了这种行为。我们表明，在相同的π脉冲序列下，通过测量纵向P自旋极化的有效弛豫时间[公式：见正文]，可以直接观察到相同脉冲不完美的影响。

相似文献

1
Effects of insufficient P pulse amplitudes on C-detected PC rotational-echo double-resonance measurements in solid state NMR.
J Magn Reson. 2025 Aug;377:107908. doi: 10.1016/j.jmr.2025.107908. Epub 2025 May 28.
2
Sexual Harassment and Prevention Training
3
Gonadotropin-releasing hormone (GnRH) analogues for premenstrual syndrome (PMS).
Cochrane Database Syst Rev. 2025 Jun 10;6(6):CD011330. doi: 10.1002/14651858.CD011330.pub2.
4
Antiemetics for adults for prevention of nausea and vomiting caused by moderately or highly emetogenic chemotherapy: a network meta-analysis.
Cochrane Database Syst Rev. 2021 Nov 16;11(11):CD012775. doi: 10.1002/14651858.CD012775.pub2.
5
Probiotics for management of functional abdominal pain disorders in children.
Cochrane Database Syst Rev. 2023 Feb 17;2(2):CD012849. doi: 10.1002/14651858.CD012849.pub2.
6
Postoperative nutritional support after pancreaticoduodenectomy in adults.
Cochrane Database Syst Rev. 2025 Mar 14;3(3):CD014792. doi: 10.1002/14651858.CD014792.pub2.
7
Antioxidants for male subfertility.
Cochrane Database Syst Rev. 2022 May 4;5(5):CD007411. doi: 10.1002/14651858.CD007411.pub5.
8
Different antibiotic treatments for group A streptococcal pharyngitis.
Cochrane Database Syst Rev. 2023 Nov 15;11(11):CD004406. doi: 10.1002/14651858.CD004406.pub6.
9
Shared decision-making interventions for people with mental health conditions.
Cochrane Database Syst Rev. 2022 Nov 11;11(11):CD007297. doi: 10.1002/14651858.CD007297.pub3.
10
Exercise versus airway clearance techniques for people with cystic fibrosis.
Cochrane Database Syst Rev. 2022 Jun 22;6(6):CD013285. doi: 10.1002/14651858.CD013285.pub2.

本文引用的文献

1
A quantum processor based on coherent transport of entangled atom arrays.
Nature. 2022 Apr;604(7906):451-456. doi: 10.1038/s41586-022-04592-6. Epub 2022 Apr 20.
2
Rotational-echo double-resonance NMR. 1989.
J Magn Reson. 2011 Dec;213(2):413-7. doi: 10.1016/j.jmr.2011.09.003.
3
Robust decoupling techniques to extend quantum coherence in diamond.
Phys Rev Lett. 2010 Nov 12;105(20):200402. doi: 10.1103/PhysRevLett.105.200402.
4
Quantitative analysis of protein backbone dynamics in microcrystalline ubiquitin by solid-state NMR spectroscopy.
J Am Chem Soc. 2010 Nov 17;132(45):15957-67. doi: 10.1021/ja100726a. Epub 2010 Oct 26.
5
A frequency-selective REDOR experiment for an SI2 spin system.
J Magn Reson. 2008 Aug;193(2):308-10. doi: 10.1016/j.jmr.2008.05.012. Epub 2008 May 21.
6
Solid-state NMR yields structural constraints on the V3 loop from HIV-1 Gp120 bound to the 447-52D antibody Fv fragment.
J Am Chem Soc. 2004 Apr 21;126(15):4979-90. doi: 10.1021/ja0392162.
7
Solid-state nuclear magnetic resonance evidence for parallel and antiparallel strand arrangements in the membrane-associated HIV-1 fusion peptide.
Biochemistry. 2003 Oct 14;42(40):11879-90. doi: 10.1021/bi0348157.
8
Determination of distance of intra-molecular hydrogen bonding in (Ala-Gly)15 with silk I form after removal of the effect of MAS frequency in REDOR experiment.
J Magn Reson. 2003 Feb;160(2):91-6. doi: 10.1016/s1090-7807(02)00131-3.
9
Frequency selective heteronuclear dipolar recoupling in rotating solids: accurate (13)C-(15)N distance measurements in uniformly (13)C,(15)N-labeled peptides.
J Am Chem Soc. 2001 Apr 18;123(15):3507-19. doi: 10.1021/ja003266e.
10
SIMPSON: a general simulation program for solid-state NMR spectroscopy.
J Magn Reson. 2000 Dec;147(2):296-330. doi: 10.1006/jmre.2000.2179.

文献AI研究员

20分钟写一篇综述，助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型，支持多种主流文档格式。

立即体验