Nmr relaxation in DNA. I. The contribution of torsional deformation modes of the elastic filament

Biopolymers ◽  
1982 ◽  
Vol 21 (4) ◽  
pp. 729-762 ◽  
Author(s):  
S. A. Allison ◽  
J. H. Shibata ◽  
J. Wilcoxon ◽  
J. M. Schurr
Keyword(s):  
Nmr Relaxation ◽  
Torsional Deformation ◽  
Elastic Filament ◽  
Deformation Modes

Microstructure and microhardness evolution of Ti-10V-2Fe-3Al alloy under tensile/torsional deformation modes

2021 ◽  
pp. 160484
Author(s):  
Xueli Wang ◽  
Fuguo Li ◽  
Tianyu Xu ◽  
Xinkai Ma ◽  
Botong Hou ◽  
...  
Keyword(s):  
Torsional Deformation ◽  
Deformation Modes

Mononucleotides 31P NMR relaxation measurement

1983 ◽  
Vol 80 ◽  
pp. 831-832 ◽  
Author(s):  
A.M. Avedikian ◽  
D. Besserre ◽  
M. Delepierre
Keyword(s):  
31P Nmr ◽  
Nmr Relaxation ◽  
Relaxation Measurement

Analysis of the backbone dynamics of capsicein using 15N NMR relaxation rate measurements

1994 ◽  
Vol 91 ◽  
pp. 776-784
Author(s):  
C van Heijenoort ◽  
S Bouaziz ◽  
E Guittet
Keyword(s):  
Relaxation Rate ◽  
Nmr Relaxation ◽  
Backbone Dynamics ◽  
15N Nmr ◽  
15N Nmr Relaxation

1H-NMR RELAXATION STUDIES ON THE NATURE OF THE SEMICONDUCTING STATE OF (TMTTF)2Br AND (TMTTF)2PF6: MAGNETISM

1983 ◽  
Vol 44 (C3) ◽  
pp. C3-1095-C3-1097
Author(s):  
T. Takahashi ◽  
F. Creuzet ◽  
D. Jérôme ◽  
J. M. Fabre
Keyword(s):  
1H Nmr ◽  
Nmr Relaxation ◽  
Relaxation Studies

Structure and Dynamics of Spherical and Rodlike Alkyl Ethoxylate Surfactant Micelles Investigated Using NMR Relaxation and Atomistic Molecular Dynamics Simulations

2019 ◽  
Author(s):  
Allison Edwards ◽  
Abdolreza Javidialesaadi ◽  
Katie Weigandt ◽  
George Stan ◽  
Charles Eads
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Nmr Relaxation ◽  
Cross Relaxation ◽  
Relaxation Rates ◽  
Surfactant Micelles ◽  
Cylindrical Micelles ◽  
Spherical Micelles ◽  
Dynamics Simulations ◽  
Relative Motions

We study molecular arrangements and dynamics in alkyl ethoxylate nonionic surfactant micelles by combining high field (600 and 700 MHz) NMR relaxation measurements with large-scale atomistic molecular dynamics simulations. For spherical micelles, but not for cylindrical micelles, cross relaxation rates are positive only for surfactant alkyl tail atoms connected to the hydrophilic head group. All cross relaxation rates are negative for cylindrical micelles. This effect is reproducible either by changing composition (ratios of the nonionic surfactants) or changing temperature of a single surfactant in order to change the micelle shape. We validate the micelle shape by SANS and use the results as a guide for our simulations. We calculate parameters that determine relaxation rates directly from simulated trajectories, without introducing specific functional forms. Results indicate that relative motions of nearby atoms are liquid-like, in agreement with 13C T1 measurements, though constrained by micelle morphology. Relative motions of distant atoms have slower components because the relative changes in distances and angles are smaller when the moving atoms are further apart. The slow, long-range motions appear to be responsible for the predominantly negative cross relaxation rates observed in NOESY spectra. The densities of atoms from positions 1 and 2 in the boundary region are lower in spherical micelles compared to cylindrical micelles. Correspondingly, motions in this region are less constrained by micelle morphology in the spherical compared to the cylindrical cases. The two effects of morphology lead to the unusual occurrence of positive cross relaxation involving positions 1 and 2 for spheres.

Calculation-and-experimental estimation of the role of the frequency ratio in changing the endurance at two-frequency deformation modes

2019 ◽  
Vol 85 (1(I)) ◽  
pp. 64-71 ◽  
Author(s):  
M. M. Gadenin
Keyword(s):  
High Frequency ◽  
Experimental Studies ◽  
Low Frequency ◽  
Reduction Factor ◽  
Single Frequency ◽  
Cyclic Loads ◽  
Small Ratio ◽  
Harmonic Components ◽  
Deformation Modes

The cycle configuration at two-frequency loading regimes depends on the number of parameters including the absolute values of the frequencies and amplitudes of the low-frequency and high-frequency loads added during this mode, the ratio of their frequencies and amplitudes, as well as the phase shift between these harmonic components, the latter having a significant effect only with a small ratio of frequencies. Presence of such two-frequency regimes or service loading conditions for parts of machines and structures schematized by them can significantly reduce their endurance. Using the results of experimental studies of changes in the endurance of a two-frequency loading of specimens of cyclically stable, cyclically softened and cyclically hardened steels under rigid conditions we have shown that decrease in the endurance under the aforementioned conditions depends on the ratio of frequencies and amplitudes of operation low-frequency low-cycle and high-frequency vibration stresses, and, moreover, the higher the level of the ratios of amplitudes and frequencies of those stacked harmonic processes of loading the greater the effect. It is shown that estimation of such a decrease in the endurance compared to a single frequency loading equal in the total stress (strains) amplitudes can be carried out using an exponential expression coupling those endurances through a parameter (reduction factor) containing the ratio of frequencies and amplitudes of operation cyclic loads and characteristic of the material. The reduction is illustrated by a set of calculation-experimental curves on the corresponding diagrams for each of the considered types of materials and compared with the experimental data.

TEMPERATURE CORRECTION MODELS FOR NMR RELAXATION TIME DISTRIBUTION IN CARBONATE ROCKS

2019 ◽  
Author(s):  
Gabor Husan ◽  
Shouxiang Ma ◽  
Wei Shao ◽  
Songhua Chen
Keyword(s):  
Relaxation Time ◽  
Carbonate Rocks ◽  
Time Distribution ◽  
Nmr Relaxation ◽  
Temperature Correction ◽  
Relaxation Time Distribution ◽  
Nmr Relaxation Time

Influence of hot torsional deformation of mild steel on precipitation of AIN from austenite

1974 ◽  
Vol 1 (1) ◽  
pp. 151-152 ◽  
Author(s):  
F. Vodopivec
Keyword(s):  
Mild Steel ◽  
Torsional Deformation

Temperature Dependence of Molecular Conformation, Dynamics, and Chemical Shift Anisotropy of α,α-Trehalose in D2O by NMR Relaxation

1997 ◽  
Vol 119 (6) ◽  
pp. 1336-1345 ◽  
Author(s):  
Gyula Batta ◽  
Katalin E. Kövér ◽  
Jacquelyn Gervay ◽  
Miklós Hornyák ◽  
Gareth M. Roberts
Keyword(s):  
Chemical Shift ◽  
Temperature Dependence ◽  
Molecular Conformation ◽  
Chemical Shift Anisotropy ◽  
Nmr Relaxation
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