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Статті в журналах з теми "Transverse and Longitudinal Relaxation Methods"
TODICA, M. "NMR OBSERVATION OF THE SPIN-LATTICE AND SPIN-SPIN RELAXATION IN SOME POLIBUTADIENES WITH DIFFERENT VINYL CONTENTS." International Journal of Modern Physics B 19, no. 13 (May 20, 2005): 2167–74. http://dx.doi.org/10.1142/s0217979205029705.
Повний текст джерелаChance, Brent H., and Don E. Bray. "Nondestructive Monitoring of Stress Relaxation in Welded Steel Plates." Journal of Pressure Vessel Technology 124, no. 3 (July 26, 2002): 343–48. http://dx.doi.org/10.1115/1.1491581.
Повний текст джерелаWei, Mengmeng, Wenbin Yu, Min Zhou, Wei Huang, Yuanxing Liu, and Xinye Xu. "Three techniques for measuring the transverse relaxation time of cesium atoms." AIP Advances 13, no. 3 (March 1, 2023): 035327. http://dx.doi.org/10.1063/5.0140593.
Повний текст джерелаMonaretto, Tatiana, Tiago Bueno Moraes, and Luiz Alberto Colnago. "Recent 1D and 2D TD–NMR Pulse Sequences for Plant Science." Plants 10, no. 5 (April 21, 2021): 833. http://dx.doi.org/10.3390/plants10050833.
Повний текст джерелаTODICA, M. "COMPARATIVE OBSERVATION OF THE NMR SPIN-LATTICE AND SPIN-SPIN RELAXATION IN MOLTEN AND CROSS-LINKED POLIBUTADIENE." International Journal of Modern Physics B 19, no. 10 (April 20, 2005): 1771–81. http://dx.doi.org/10.1142/s0217979205029353.
Повний текст джерелаChen, Jianfei, Jingyu Chu, Wenchun Jiang, Bin Yao, Fan Zhou, Zhenbo Wang, and Pengcheng Zhao. "Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment." Materials 13, no. 4 (February 12, 2020): 837. http://dx.doi.org/10.3390/ma13040837.
Повний текст джерелаHaribabu, Viswanathan, Palani Sharmiladevi, Najim Akhtar, Abubacker Sulaiman Farook, Koyeli Girigoswami, and Agnishwar Girigoswami. "Label Free Ultrasmall Fluoromagnetic Ferrite-clusters for Targeted Cancer Imaging and Drug Delivery." Current Drug Delivery 16, no. 3 (February 1, 2019): 233–41. http://dx.doi.org/10.2174/1567201816666181119112410.
Повний текст джерелаUddin, Md Nasir, R. Marc Lebel, Peter Seres, Gregg Blevins, and Alan H. Wilman. "Spin echo transverse relaxation and atrophy in multiple sclerosis deep gray matter: A two-year longitudinal study." Multiple Sclerosis Journal 22, no. 9 (July 19, 2016): 1133–43. http://dx.doi.org/10.1177/1352458515614091.
Повний текст джерелаZhang, Yapeng, Jingjing Cheng, and Wenzhong Liu. "Characterization and Relaxation Properties of a Series of Monodispersed Magnetic Nanoparticles." Sensors 19, no. 15 (August 2, 2019): 3396. http://dx.doi.org/10.3390/s19153396.
Повний текст джерелаWernersson, Sven, Göran Carlström, Andreas Jakobsson та Mikael Akke. "Rapid measurement of heteronuclear transverse relaxation rates using non-uniformly sampled <i>R</i><sub>1<i>ρ</i></sub> accordion experiments". Magnetic Resonance 2, № 2 (12 липня 2021): 571–87. http://dx.doi.org/10.5194/mr-2-571-2021.
Повний текст джерелаДисертації з теми "Transverse and Longitudinal Relaxation Methods"
Huen, Isaac Kwong-Ping. "Assessment of placental and fetal oxygenation in normal and abnormal pregnancy using magnetic resonance imaging." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/assessment-of-placental-and-fetal-oxygenation-in-normal-and-abnormal-pregnancy-using-magnetic-resonance-imaging(8cd3f9a2-22cb-4c95-bee3-06b5c4bfc2d2).html.
Повний текст джерелаAveiro, Susana Seabra. "The p22HBP heme binding protein: an NMR study of the dynamics and heme-protein interactions." Doctoral thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/14278.
Повний текст джерелаThe work presented in this Thesis investigates the dynamics and molecular interactions of p22HBP and the p22HBP-tetrapyrrole complex. Specifically, the key residues involved when a tetrapyrrole binds to p22HBP were sought. Previous molecular modelling studies identified three possible charged residues R56, K64 and K177 as possibly being important in tetrapyrrole binding via electrostatic interactions with the propionate groups of the tetrapyrrole. A number of variants of murine p22HBP were therefore prepared and fluorescence quenching and NMR used to verify the integrity of the variants and their interaction with tetrapyrrole. The same molecular modelling studies identified a mobile loop Y171-R180 in p22HBP that decreased in mobility on tetrapyrrole binding, therefore to confirm this mobility change dynamics studies based on NMR relaxation experiments were carried out. Finally in order to obtain a non heme-binding form of human p22HBP a chimeric p22HBP was designed and constructed. This construct, and the resulting protein, will be important for future siRNA knockdown studies where rescue or recovery of function experiments are required to prove the knockdown results. Chapter one discusses the current state of the art in terms of the biological, structural and functional aspects of p22HBP. The main objectives of the Thesis are also introduced here. Chapter two presents a detailed description of the different expression vectors (pNJ2 and pet28-a) and procedures used for overexpression and purification of murine p22HBP and its variants and human p22HBP. All expression and purification systems used gave good yields and allowed isotopic labeling to be carried out. The fluorescence quenching results for tetrapyrrole binding to murine p22HBP and variants are presented in chapter three along with the dissociation constants that were found to be in the nanomolar range for wild type murine and human p22HBP. The same studies were performed for murine p22HBP variants, with hydrophobic and polar changes being introduced at R56, K64 and K177. The dissociation constants were found to double in some cases but no significant changes in the strength of hemin-protein interactions were observed. The tetrapyrrole interaction with p22HBP was also followed by NMR spectroscopy, where chemical shift mapping was used to identify binding pocket location. All the variants and wild type human p22HBP were found to bind at the same location. Chapter 4 contains the data from 2D and 3D experiments carried out on 15N/13C labelled human p22HBP that was used to obtain backbone assignments. Comparison with wild type murine p22HBP assignments, PPIX titrations and theoretical calculations based on chemical shifts (Talos+) allowed 82% of the backbone resonances to be assigned. The results from the relaxation experiments used to probe the dynamics of the mobile loop in p22HBP on binding to tetrapyrrole are presented in chapter 5. The overall protein was found to tumble isotropically in the free and bound forms however the results to probe mobility changes in the 171-180 loop on tetrapyrrole binding proved inconclusive as only residue could be assigned and this did not seem to become significantly less mobile. The final chapter describes the design and construction of a chimeric p22HBP. For these purpose, the alfa1-helix sequence of human p22HBP in the phHBP1 plasmid was replaced by its homologous sequence in hSOUL, a non heme-binding protein with identical 3D structure. The results however indicated that either the incorrect sequence was introduced into the plasmid or the purification procedure was inadequate.
O trabalho apresentado nesta Tese focou-se na dinâmica e nas interações moleculares da p22HBP e do complexo p22HBP-tetrapirrol, nomeadamente nos resíduos chave envolvidos nesta interação. Estudos prévios de modelação molecular identificaram três possíveis resíduos chave R56, K64 e K177 como sendo importantes na interação com os tetrapirróis, através de interações eletrostáticas com os grupos propionato do tetrapirrol. Foram desenhados e construídos variantes da p22HBP murina e foram desenvolvidos estudos de extinção de fluorescência e RMN para avaliar a integridade dos variantes e a sua interação com os tetrapirróis. Os mesmos estudos de modelação molecular identificaram ainda uma zona flexível (Y171-R180) na p22HBP que diminui a mobilidade com a interação do tetrapirrol. Para confirmar esta alteração de mobilidade, foram realizados estudos de dinâmica, baseados em RMN. Por fim, com o intuito de obter uma versão não funcional da p22HBP humana, foi planeada e construída uma versão quimérica da p22HBP humana. No futuro, esta nova versão da p22HBP quimérica, será importante para os estudos de knockdown envolvendo siRNA. O capítulo um introduz uma revisão dos aspetos biológicos da p22HBP nomeadamente os estudos estruturais e as possíveis funções que foram identificadas. Os principais objetivos da tese são também apresentados neste capítulo. No capítulo dois é apresentada uma descrição detalhada dos diferentes vectores de sobreexpressão (pNJ2 e pet28-a) e dos métodos de sobreexpressão e purificação da p22HBP murina e respectivos variantes, bem como da p22HBP humana. Todos os sistemas de sobreexpressão e purificação utilizados obtiveram bons rendimentos e permitiram a marcação isotópica das proteínas. No capítulo 3 são apresentados os resultados de extinção de fluorescência para a interação da p22HBP murina e humana com hemina através das constantes de dissociação determinadas na ordem dos nanomolar. Os mesmos estudos foram realizados para os variantes da p22HBP murina, com alterações hidrofóbicas e de polaridade nos resíduos R56, K64 e K177. Em alguns casos, as constantes de dissociação determinadas são mais elevadas, embora não se tenham verificado alterações significativas na força da interação proteína-hemo. As interações tetrapirrólicas com a p22HBP foram também estudadas por espectroscopia de RMN, onde foram mapeadas as diferenças nos desvios químicos para identificar a localização da zona de interação. A localização da zona de interação dos variantes da p22HBP e a p2HBP humana mantém-se igual à p22HBP murina. No capítulo 4 encontram-se os resultados das experiências 2D e 3D realizadas na p22HBP humana, isotopicamente marcada com 15N/13C, para identificar as ressonâncias da cadeia principal. 82% dos sistemas de spin da cadeia principal foram identificados através da comparação com a p22HBP murina, das titulações com PPIX e de cálculos teóricos baseados nos desvios químicos (Talos+). No capítulo 5 são apresentados os resultados das experiências de relaxação, usados para comprovarem a dinâmica do loop na p22HBP aquando da interação com o tetrapirrol. A proteína no seu todo move-se de uma forma isotrópica na forma livre e ligada. No entanto os resultados para comprovar as alterações de mobilidade no loop 171-180 na presença de hemo, foram inconclusivos uma vez que só a um resíduo foi atribuído um sistema de spin, e não foi indicativo da perda significativa de mobilidade. O último capítulo descreve o planeamento e a construção da p22HBP quimérica. Para tal, a sequência que codifica a hélix alfa 1 da p22HBP humana, no plasmídeo phHBP1, foi substituída pela sequência homóloga da SOUL humana, uma proteína com uma estrutura 3D semelhante mas não liga ao hemo. Os resultados no entanto demonstraram que ou a sequência não foi introduzida corretamente no plasmídeo ou o sistema de purificação não foi adequado.
Papadopoulos, Konstantinos. "Investigation of magnetic order in nickel-5d transition metal systems." Thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-383009.
Повний текст джерелаWu, Yi Ying, and 吳奕螢. "Correction of Longitudinal and Transverse Relaxation Effects of Contrast Agent Extravasation in Dynamic Susceptibility Contrast MRI at 3T." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/84415322147113507022.
Повний текст джерела長庚大學
醫學物理暨影像科學研究所
97
Contrast agent extravasation in dynamic susceptibility contrast- (DSC-) MRI of brain tumors may cause significant errors in the estimation of relative cerebral blood volume (rCBV) which can mislead the tumor diagnosis or treatment. The current model for correcting the contrast agent leakage (termed LT1 model in this paper) only takes the T1 effect into account, which may fail the cases when the T2* effect is pronounced. This study proposed a two-compartmental model, LT1+T2 model, that was able to describe the measured DSC-MRI signals with the combined T1 and T2* effects from the contrast agent leakage. Results from computer simulation showed that the T2* effect was more dominant with longer TE, at higher field strength and when the leakage was more severe. DSC-MRI was performed on three patients with brain tumors at a clinical 3T scanner. Images were analyzed using the LT1+T2 model, as well as the LT1 model for comparison, and the rCBV maps were corrected correspondingly. The T2* effect dominated the measured signal time curves in all our experimental data, which were well fitted by both LT1 and LT1+T2 model. However, negative leakage indices (K2) were obtained with the LT1 model, whereas those with the LT1+T2 model were positive and thus more meaningful. Corrected rCBV maps with these two models demonstrated similar patterns that exhibited values decreased from the uncorrected ones in tumor regions with high contrast extravasation. The ratios of corrected/uncorrected normalized rCBV maps (to normal deep white matters) ranged 0.40-0.60 and 0.89-0.99 for regions-of-interest in tumors and gray matters, respectively. The proposed LT1+T2 model is expected to be capable of correcting the contrast agent extravasation effects in DSC-MRI signals acquired at different clinical platforms and imaging parameters.
HOSEK, TOMAS. "Development of new NMR methods to study intrinsically disordered proteins." Doctoral thesis, 2015. http://hdl.handle.net/2158/969485.
Повний текст джерелаPIAI, ALESSANDRO. "Characterizing structural disorder through NMR: new methods and applications." Doctoral thesis, 2015. http://hdl.handle.net/2158/1015862.
Повний текст джерелаКниги з теми "Transverse and Longitudinal Relaxation Methods"
Kudinov, Igor', Anton Eremin, Konstantin Trubicyn, Vitaliy Zhukov, and Vasiliy Tkachev. Vibrations of solids, liquids and gases taking into account local disequilibrium. ru: INFRA-M Academic Publishing LLC., 2022. http://dx.doi.org/10.12737/1859642.
Повний текст джерелаЧастини книг з теми "Transverse and Longitudinal Relaxation Methods"
Klieber, Christoph, Thomas Pezeril, Stéphane Andrieu, and Keith A. Nelson. "GHz Longitudinal and Transverse Acoustic Waves and Structural Relaxation Dynamics in Liquid Glycerol." In Springer Series in Chemical Physics, 499–501. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-95946-5_162.
Повний текст джерелаGarteiser, Philippe, Octavia Bane, Sabrina Doblas, Iris Friedli, Stefanie Hectors, Gwenaël Pagé, Bernard E. Van Beers, and John C. Waterton. "Experimental Protocols for MRI Mapping of Renal T1." In Methods in Molecular Biology, 383–402. New York, NY: Springer US, 2021. http://dx.doi.org/10.1007/978-1-0716-0978-1_22.
Повний текст джерелаMüller, Andreas, and Martin Meier. "Assessment of Renal Volume with MRI: Experimental Protocol." In Methods in Molecular Biology, 369–82. New York, NY: Springer US, 2021. http://dx.doi.org/10.1007/978-1-0716-0978-1_21.
Повний текст джерела"Relaxation and the NOE." In Essential Mathematics for NMR and MRI Spectroscopists, 636–69. The Royal Society of Chemistry, 2016. http://dx.doi.org/10.1039/bk9781782627975-00636.
Повний текст джерела"Lecture 12: A Relaxation Theory of Nuclear Spin States." In Lectures On Spin Dynamics: The Theoretical Minimum, 143–62. The Royal Society of Chemistry, 2022. http://dx.doi.org/10.1039/9781837670871-00143.
Повний текст джерелаFushman, David, and David Cowburn. "Nuclear Magnetic Resonance Relaxation in Determination of Residue-Specific 15N Chemical Shift Tensors in Proteins in Solution: Protein Dynamics, Structure, and Applications of Transverse Relaxation Optimized Spectroscopy." In Methods in Enzymology, 109–26. Elsevier, 2001. http://dx.doi.org/10.1016/s0076-6879(01)39312-6.
Повний текст джерелаQasrawi, Radwan, Diala Abu Al-Halawa, Omar Daraghmeh, Mohammad Hjouj, and Rania Abu Seir. "Medical Image Processing and Analysis Techniques for Detecting Giant Cell Arteritis." In Giant-Cell Arteritis [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97161.
Повний текст джерела"variety of span lengths, widths, number of grlders and slab thickness were analyzed. For two 50 ft. spans with seven girders (slab aspect ratio of 0.12) the value of D in the S/D formula varies between 6.1 and 7.96 for midspan center girder depending on the slab to girder stiffness ratio. This is in lieu of the 5.5 specified in AASHTO Standard Specification. Perhaps more representative are results for a 100 ft., two span continuous bridge with five girders spaced at 9 ft, where D varies between 8.4 and 10.8. Another Interesting result in Walker's report is regarding the structural idealization of the bridge. It has been found that the simple grid model can represent the essential behavior of the bridge as the more exact models do. The grid model was constructed such that the transverse beams represent the equivalent slab and diaphragms (if present) and the longitudinal beams represent the longitudinal composite girders. The fact that the grid model gives good representation of the essential behavior of the bridge can not be generalized. The grid model has certain limitations, however it gives a better representation of the bridge behavior than does a simple two-value S/D rule. A simple micro computer implementation of a grid model is seen by Walker as a better method than the S/D formula to predict lateral load distribution. Recently Hays, Sessions and Berry (8), have demonstrated that the effect of span length, which is neglected in AASHTO can be considerable. They found that AASHTO results are slightly unconservative for short spans and quite conservative for longer spans. Furthermore they compared the results of a finite element analysis with field test results and concluded that the comparison showed generally good agreement. A wide range of load distribution methods are available in the technical literature (9-17). These methods range from empirical methods, as the one recommended by AASHTO and described above, to sophisticated computer-based solution techniques which take into consideration the three-dimensional response of the bridge. The computer methods utilize a wide rang of structural idealization. Some use a simple equivalent anisotropic plate or grid work while others use sophisticated finite element models that consider detailed aspects of the interaction between the components of the bridge superstructure. The parameters which influence the load distribution most are; the number of girders and their spacing, the span length, and the girder moment of Inertia and slab thickness." In Composite Steel Structures, 46. CRC Press, 1987. http://dx.doi.org/10.1201/9781482286359-7.
Повний текст джерелаТези доповідей конференцій з теми "Transverse and Longitudinal Relaxation Methods"
Shtark, Abraham, Hagay Grosbein, Guy Sameach, and Harry H. Hilton. "An Alternative Protocol for Determining Viscoelastic Material Properties Based on Tensile Tests Without the Use of Poisson’s Ratios." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41068.
Повний текст джерелаJang, Chang Doo, Ha Cheol Song, and Young Chun Jo. "Fatigue Life Assessment of Fillet Welded Joint Considering the Relaxation and Redistribution of Residual Stresses." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51400.
Повний текст джерелаScola, Mallory R., Joe N. Kornegay, James F. Howard, Timothy C. Nichols, and Caterina M. Gallippi. "Viscoelastic Strain Response (ViSR) Ultrasound in Pre-Clinical and Clinical Application." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65596.
Повний текст джерелаKhanna, Faqir. "Ward-Takahashi Relations: Longitudinal and Transverse." In Fifth International Conference on Mathematical Methods in Physics. Trieste, Italy: Sissa Medialab, 2007. http://dx.doi.org/10.22323/1.031.0003.
Повний текст джерелаLuca Motoc, Dana. "Dynamic Mechanical Characterization of CF/GF Hybrid Reinforced Polymeric Composite Structures." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82185.
Повний текст джерелаManolis, George, and George Dadoulis. "PASSIVE CONTROL ISSUES ON THE LONGITUDINAL AND TRANSVERSE VIBRATIONS OF FLEXIBLE PYLONS." In 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Athens: Institute of Structural Analysis and Antiseismic Research National Technical University of Athens, 2021. http://dx.doi.org/10.7712/120121.8693.19669.
Повний текст джерелаFu, yangying, and Jie Yuan. "Investigation on the methods to extend the transverse relaxation time of polarized alkali atoms." In Fourteenth National Conference on Laser Technology and Optoelectronics, edited by Huai-Liang Xu, Feng Chen, Lingfei Ji, Buhong Li, Xiaoping Xie, Yuxin Leng, Zhengming Sheng, et al. SPIE, 2019. http://dx.doi.org/10.1117/12.2532465.
Повний текст джерелаObreja, Dan C., Radoslav Nabergoj, Liviu I. Crudu, and Sandita Pacuraru-Popoiu. "Transverse Stability of a Cargo Ship at Parametric Rolling on Longitudinal Waves." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57768.
Повний текст джерелаNemirovskii, Yu V., and S. V. Tikhonov. "Longitudinal-Transverse bending of reinforced concrete rods on the basis of nonlinear diagrams of deformation of phase materials." In NUMERICAL METHODS FOR SOLVING PROBLEMS IN THE THEORY OF ELASTICITY AND PLASTICITY (EPPS 2021). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0073289.
Повний текст джерелаMa, Yanbao. "Heat Pulse Propagation in Pure Sodium Fluoride at Low Temperatures From Ballistic to Diffusive Conduction." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64284.
Повний текст джерелаЗвіти організацій з теми "Transverse and Longitudinal Relaxation Methods"
Jury, William A., and David Russo. Characterization of Field-Scale Solute Transport in Spatially Variable Unsaturated Field Soils. United States Department of Agriculture, January 1994. http://dx.doi.org/10.32747/1994.7568772.bard.
Повний текст джерела