Showing papers in "Journal of Magnetic Resonance in 2014"

TL;DR: Compared to the only reliable quantitative (13)C NMR method for unlabeled solids previously available, namely direct-polarization NMR, the measuring time is reduced by more than a factor of 50, enabling higher-throughput quantitative NMR studies.

TL;DR: The perspective reviews quantitative investigations of chemical exchange phenomena in proteins and other biological macromolecules using NMR spectroscopy, particularly relaxation dispersion methods, and applications to folding, molecular recognition, catalysis, and allostery by proteins and nucleic acids are highlighted.

TL;DR: Key advances in basic physical-chemistry and NMR methodology are summarized, their limitations are outlined and future R&D directions are envisioned.

TL;DR: Low-Irradiation Generation of High Tesla-SABRE (LIGHT-SA BRE) which works with simple pulse sequences and low power deposition and should be usable at any magnetic field and for hyperpolarization of many different nuclei.

TL;DR: Basic concepts, recent developments and future opportunities in NMR spectroscopy in liquids are discussed, which shows the technique is still too low to solve a variety of cutting-edge biological problems in solution.

TL;DR: An improved version of the widely distributed open-source SIMPSON NMR simulation software package adapted to contemporary high performance hardware setups and described the novel features for fast computation including internal matrix manipulations, propagator setups and acquisition strategies.

TL;DR: Non-uniform sampling (NUS) and suitable reconstruction methods for multi-dimensional NMR data acquisition with complex biological macromolecules have been discussed in this article, which will dramatically enhance the power of modern biological NMR.

TL;DR: Application of band-selective homonuclear (BASH) decoupling pulses during acquisition of the (1)H free induction decay is shown to be an efficient procedure for removal of scalar and residual dipolar couplings between amide and aliphatic protons.

TL;DR: In this article, the effects of nuclear signal quenching induced by the presence of a paramagnetic polarizing agent are documented for conditions used in magic angle spinning (MAS)-dynamic nuclear polarization (DNP) experiments on homogeneous solutions.

TL;DR: The results of a systematic measurement of the magnetic susceptibility of small material samples in a 9.4 T MRI scanner are presented, and particularly suitable materials with susceptibilities close to water are identified.

TL;DR: This paper surveys variational approaches for the reconstruction of phase-encoded magnetic resonance velocity images from sub-sampled k-space data and presents a robust guideline for setting up a variational reconstruction scheme for MR velocity imaging.

TL;DR: The echo envelope modulation experiments reveal echo decay rates increased by enhanced instantaneous diffusion and passage-specific effects in the nuclear modulations, and peculiarities were observed in solid-state FT EPR spectra of disordered systems.

TL;DR: After many years of dealing with exclusively heteronuclear NMR experiments based on (13)C direct detection, the relevance of these experiments is addressed here to address their relevance when studying IDPs.

TL;DR: This work presents a constant-time version of the proposed BIRD decoupling scheme with full homonuclear decouplings, and the effects of strong coupling are discussed.

TL;DR: The reduction of optimal relaxation delay by radio-frequency driven recoupling (RFDR) was demonstrated on powder samples of glycine and ethenzamide with one and multi-dimensional NMR measurements.

TL;DR: The achievement of 1% hyperpolarization of 3-amino-1,2,4-triazine protons in water using the parahydrogen induced polarization technique based on signal amplification by reversible exchange (SABRE).

TL;DR: It is shown that a certain degree of selectivity can be achieved for particular faces of the metal, simply based on the orientation of the sample, which will become valuable in many applications involving battery systems, but also metals, in general.

TL;DR: The world's first NMR magnet comprising an inner REBCO coil and outer low-temperature superconducting (LTS) coils is developed, successfully charged without degradation and mainly operated at 400MHz (9.39T).

TL;DR: This work has measured the water polarization transfer to the transmembrane domain of the influenza M2 protein to obtain information on the structure of this tetrameric proton channel.

TL;DR: DNP-enhanced solid-state NMR experiments performed at 9.4 T are complemented by high-field CW EPR measurements performed at the same magnetic field, and Microwave absorption by the DNP glassy matrix is observed even below the glass transition temperature caused by softening of the glass.

TL;DR: It is shown that DNP enhancement of static samples can improve by modulating the microwave (MW) frequency at a constant field of 3.34 T.

TL;DR: This study shows that the use of mixing proton magnetization, instead of (15)N, via the recoupled (1)H-( 1)H dipolar couplings enable faster ( 15)N/N correlation, and demonstrates that a 3D (15]N/(15) N/(1) H experiment can render higher resolution spectra that will be useful in the structural studies of proteins at ultrafast MAS frequencies.

TL;DR: Qu quasi-simultaneous proton and fluorine NMR spectra were recorded with a series of alternating 19F and 1H single scan spectra along the reaction time coordinate of a homogeneously catalysed esterification model reaction containing fluorinated compounds.

TL;DR: Overall, the results suggest that a combination of fp-RFDR-XY4(1)4 employed in the recycle delay with a large RF-field to decrease the recycledelay, and f p- RFDR- XY4 in the mixing period with a moderate RF- field, is a robust and efficient method for 2D single-quantum/single-Quantum (1)H/(1) H correlation experiments at ultrafast MAS frequencies.

TL;DR: In this article, a broadband proton-decoupled CLIP/CLAP-HSQC experiments were conducted for the accurate determination of one-bond heteronuclear couplings and for the reliable measurement of small residual dipolar coupling constants.

TL;DR: In this article, the combination of low-B1 (+) adiabatic pulses and high permittivity (er ≈ 165) dielectric pads effectiveness to reproducibly improve the inversion efficiency for whole-brain MP2RAGE scans, at ultra-high field.

TL;DR: This work presents an easy-to-use protocol to batch generate and rank optimal Poisson-gap NUS schedules for use with 2D NMR with minimized noise and accurate signal reproduction, without the need for the creation of synthetic spectra.

TL;DR: It is shown that, using the W-band ELDOR- (electron-electron double resonance) detected NMR (EDNMR) method, different principal nitrogen hyperfine, Azz, and quadrupole, Pzz, tensor values of a nitroxide radical in glassy 2-propanol matrix can be measured with high accuracy.

TL;DR: This manuscript shows that the incorporation of a phase modulation into a long quadrupolar recoupling pulse, lasting 10 rotor periods that are sandwiched between rotor-synchronized pairs of dipolar Recoupling π pulses, extends significantly the range of the values of the quadrupole moments that can be accessed by the experiment.

TL;DR: SPEN MRI sequences with slice-selection and arbitrary excitation pulses can be devised, endowing SPEN with the potential to deliver single-shot multi-slice chemical shift images, with a temporal resolution required for hyperpolarized dynamic metabolic imaging.