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Дисертації з теми "Field Cycling NMR"

Автор: Grafiati

Опубліковано: 5 березня 2024

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1

Pine, Kerrin J. "Localized fast field-cycling NMR relaxometry." Thesis, University of Aberdeen, 2014. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=215228.

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Conventional MRI relies on a strong fixed magnetic field B0 which is stable during the imaging process. By contrast, field-cycling MRI switches the strength of B0 up or down during an experiment. In this way, field-cycling provides access to endogenous information not accessible to standard MRI, such as enhanced T1 relaxation at certain NMR frequencies due to interactions between hydrogen and nitrogen nuclei in proteins. However, biomedical research of T1 dispersion is limited by the unavailability of equipment and rapid software methods. Strategies are presented to address these deficiencies.

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2

Zampetoulas, Vasileios. "Fast field-cycling NMR relaxometry on biological samples extended to ultra-low magnetic fields." Thesis, University of Aberdeen, 2018. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=237833.

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3

Miesel, Karsten [Verfasser]. "Field cycling NMR experiments with hyperpolarized multi-spin-systems / Karsten Miesel." Berlin : Freie Universität Berlin, 2008. http://d-nb.info/1023401371/34.

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4

Wu, Weimin. "Field-cycling NMR investigations of nuclear spin relaxation and proton tunnelling." Thesis, University of Nottingham, 2006. http://eprints.nottingham.ac.uk/10155/.

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A current-switched superconducting field-cycling NMR spectrometer has been designed and built for studying the role of quantum tunnelling in molecular dynamics. The instrument is designed for work in the solid state with sample temperatures extending from 4K up to 300K. The maximum field-switching rate is 10Ts-1. Among the samples studied in this thesis is the nuclear spin-relaxation and proton tunnelling. Concerted double proton transfer in the hydrogen bonds of carboxylic acid dimers is well established as the model system for translational quantum tunnelling. The model system has been chose

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5

Noble, Daniel Leigh. "Field-cycling NMR investigations of proton tunnelling and nuclear spin relaxation." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438354.

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6

Freiman, Gabriel, Jean-Pierre Korb, Benjamin Nicot, and Patrice Ligneul. "Microscopic wettability of carbonate rocks: a proton field cycling NMR approach." Diffusion fundamentals 10 (2009) 25, S. 1-3, 2009. https://ul.qucosa.de/id/qucosa%3A14116.

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Nuclear Magnetic Relaxation Dispersion (NMRD) is strongly sensitive to the microscopic wettability of oil and brine bearing carbonate rocks. Exploring a very large range of low frequency enables isolating the typical NMRD dispersion features, 1/T1Surf, associated to the different processes of molecular surface dynamics. This allows a separation of the surface and bulk microdynamics of oil and water even for a biphasic saturation of petroleum rocks. Several surface dynamical parameters were determined and related to the concept of microscopic wettability of oil and water in porous media.

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7

Sun, Cheng. "Quantum dynamics and tunnelling of methyl rotors studied by field-cycling NMR." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10751/.

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Quantum dynamics and tunnelling of methyl rotors has been studied using field-cycling nuclear magnetic resonance (NMR) spectrometer, in a variety of samples. The characteristic frequency of the tunnelling motion of methyl groups has been investigated using both low-field dipole-dipole driven experiments and tunnel resonance level-crossing experiments. The classical hopping and quantum tunnelling of methyl groups have been studied by making temperature-dependent and field-dependent measurements of the spin-lattice relaxation time T1. The spectral density functions of the dipolar interaction, me

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8

McGloin, C. J. "Hydrogen bond dynamics : an investigation using NMR field-cycling and QENS techniques." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298074.

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9

Volgmann, K., B. Kresse, A. F. Privalov, F. Fujara, and P. Heitjans. "7Li Field-Cycling NMR as Powerful Tool for Investigating Li Ion Conductors." Diffusion fundamentals 21 (2014) 25, S.1, 2014. https://ul.qucosa.de/id/qucosa%3A32435.

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10

Hofmann, Marius [Verfasser], and Ernst [Akademischer Betreuer] RößLer. "Field-Cycling NMR as a Tool of Molecular Rheology / Marius Hofmann ; Betreuer: Ernst Rößler." Bayreuth : Universität Bayreuth, 2016. http://d-nb.info/1116426382/34.

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11

Abu-Khumra, Sabah. "Quantum rotor tunnelling in methyl ethyl ketone and acetophenone studied using field-cycling NMR techniques." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/14032/.

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In the solid state the rotation of a methyl group is hindered by a potential barrier and at low temperature the rotational motion is characterised by quantum tunnelling. The Pauli Exclusion Principle imposes constraints on the allowable eigenstates of the methyl rotor and leads to a combination of spatial and spin variables. The characteristics of these quantum tunnelling states, labelled A and E, are explored experimentally and methods are investigated for creating prescribed non-equilibrium states. We will investigate and explore the tunnelling polarization associated with the A and E tunnel

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12

Grinberg, Farida. "Reorientations mediated by translational displacements in confined liquid crystals studied by field cycling NMR relaxometry and Monte Carlo simulations: Reorientations mediated by translational displacements in confinedliquid crystals studied by field cycling NMR relaxometry and Monte Carlo simulations." Diffusion fundamentals 6 (2007) 73, S. 1-9, 2007. https://ul.qucosa.de/id/qucosa%3A14253.

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Ordering effects and low-frequency molecular dynamics in the nematic liquid crystals confined in mesoscopic pores was studied with the help of field cycling (FC) Nuclear Magnetic Resonance (NMR) relaxometry and Monte Carlo simulations. Proton relaxation rates were measured above the bulk isotropisation temperature in the broad frequency range between 2 kHz and 7 MHz. The average pore radii of confinements were between 1.5 and 15 nanometers. The relaxation dispersion curves in the confined materials exhibited strong deviations from the behaviour in bulk. In a few kHz range, a dramatic enhanceme

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13

Ardelean, Ioan, Sergiu Muncaci, Codruta Badea, Alexandra Pop, Carlos Mattea, and Siegfried Stapf. "Translational diffusion at the surface of porous media with magnetic impurities via Fast Field Cycling NMR relaxometry." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-182881.

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14

Ardelean, Ioan, Sergiu Muncaci, Codruta Badea, Alexandra Pop, Carlos Mattea, and Siegfried Stapf. "Translational diffusion at the surface of porous media with magnetic impurities via Fast Field Cycling NMR relaxometry." Diffusion fundamentals 20 (2013) 41, S. 1-2, 2013. https://ul.qucosa.de/id/qucosa%3A13609.

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15

Kresse, Holger Benjamin [Verfasser], Franz [Akademischer Betreuer] Fujara, and Ernst [Akademischer Betreuer] RößLer. "Field-Cycling NMR bei extrem kleinen Larmor-Frequenzen – Entwicklung und Anwendung / Holger Benjamin Kresse ; Franz Fujara, Ernst Rößler." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2016. http://d-nb.info/1121781705/34.

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16

Flämig, Max [Verfasser], and Ernst [Akademischer Betreuer] Rössler. "A Field Cycling NMR Relaxometry Study on Molecular Liquids and Plastically Crystalline Phases / Max Flämig ; Betreuer: Ernst Rössler." Bayreuth : Universität Bayreuth, 2020. http://d-nb.info/1222101726/34.

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17

Herrmann, Axel [Verfasser], and Ernst [Akademischer Betreuer] RößLer. "Polymer Melts Investigated by Field Cycling NMR Relaxometry: From Simple Liquid to Reptation Dynamics / Axel Herrmann. Betreuer: Ernst Rößler." Bayreuth : Universität Bayreuth, 2012. http://d-nb.info/1059412667/34.

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18

Grinberg, Farida. "Reorientations mediated by translational displacements in confined liquid crystals studied by field cycling NMR relaxometry and Monte Carlo simulations." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-194134.

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Анотація:

Ordering effects and low-frequency molecular dynamics in the nematic liquid crystals confined in mesoscopic pores was studied with the help of field cycling (FC) Nuclear Magnetic Resonance (NMR) relaxometry and Monte Carlo simulations. Proton relaxation rates were measured above the bulk isotropisation temperature in the broad frequency range between 2 kHz and 7 MHz. The average pore radii of confinements were between 1.5 and 15 nanometers. The relaxation dispersion curves in the confined materials exhibited strong deviations from the behaviour in bulk. In a few kHz range, a dramatic enhanceme

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19

TACKE, CHRISTIAN [Verfasser], Franz [Akademischer Betreuer] Fujara, and Danuta [Akademischer Betreuer] Kruk. "Resonanzen in Field-Cycling-NMR an Molekülkristallen: (reversible) Spindynamik oder (irreversible) Relaxation? / Christian Tacke. Betreuer: Franz Fujara ; Danuta Kruk." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2015. http://d-nb.info/1110980833/34.

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20

Gizatullin, Bulat [Verfasser], Jörg [Akademischer Betreuer] Kröger, Esteban Akademischer Betreuer] Anoardo, and Siegfried [Gutachter] [Stapf. "Dynamic nuclear polarization NMR fast field cycling study complex systems / Bulat Gizatullin ; Gutachter: Siegfried Stapf ; Jörg Kröger, Esteban Anoardo." Ilmenau : TU Ilmenau, 2020. http://d-nb.info/1218465778/34.

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21

Meier, Roman [Verfasser], and Ernst [Akademischer Betreuer] RößLer. "Molecular Liquids and Polymers Investigated by Field Cycling 1H NMR Relaxometry: Impact of Rotational and Translational Dynamics on Relaxation / Roman Meier. Betreuer: Ernst Rößler." Bayreuth : Universität Bayreuth, 2014. http://d-nb.info/1060009676/34.

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22

Pu, Mingming. "Investigations of the Mechanism for Activation of Bacillus Thuringiensis Phosphatidylinositol-specific Phospholipase C." Thesis, Boston College, 2009. http://hdl.handle.net/2345/1179.

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Thesis advisor: Mary F. Roberts<br>Thesis advisor: Steven D. Bruner<br>The bacterial phosphatidylinositol-specific phospholipase C (PI-PLC) from Bacillus thuringiensis is specifically activated by low concentrations of a non-substrate lipid, phosphatidylcholine (PC), presented as an interface. However, if the PC concentration in the interface is too high relative to substrate, the enzyme exhibits surface dilution inhibition. Understanding this bacterial enzyme, which shares many kinetic features with the larger and more complex mammalian PI-PLC enzymes, requires elucidating the mechanism for P

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23

Ducroix, Alice. "Multi-scale dynamics of water inside boehmite : a NMR approach." Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS575.pdf.

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Dans plusieurs domaines de la chimie, les catalyseurs occupent une place importante puisqu’ils assurent une réaction plus rapide, une meilleure sélectivité et réduisent l’utilisation de matières premières. L’industrie s’est récemment tournée vers les catalyseurs hétérogènes dont la récupération est plus facile. Ces catalyseurs sont constitués d’un support poreux et de sites actifs répartis en surface à travers la porosité du support. Pour optimiser pleinement le support, de récentes études ont abordé la question de l’accessibilité des molécules aux sites réactionnels. Cela passe notamment par

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24

Ascona, Christian Rivera. "Manipulação de coerências de múltiplo quantum em materiais magnéticos via RMN em campo externo nulo." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-15092011-153626/.

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Neste trabalho desenvolvemos metodologias para o estudo de materiais magnéticos usando Ressonância Magnética Nuclear em campo magnético externo nulo (RMNz), via a análise e manipulação das transições entre os estados de energia nucleares. Na primeira etapa, revisamos e complementamos os modelos teóricos, encontrados na literatura, que são utilizados para prever a formação dos múltiplos ecos. Concluímos deste estudo, que o aparecimento destes múltiplos ecos está associado com as transições entre os níveis de energia nuclear que são chamadas de transições de múltiplo quantum (MQ). Adicionalmente

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25

Loganathan, D. "Field cycling NMR studies of molecular dynamics in liquid crystals." Thesis, 2000. http://hdl.handle.net/2009/958.

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26

Kresse, Holger Benjamin. "Field-Cycling NMR bei extrem kleinen Larmor-Frequenzen – Entwicklung und Anwendung." Phd thesis, 2016. http://tuprints.ulb.tu-darmstadt.de/5824/1/Dissertation_Kresse_2016_.pdf.

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In dieser Arbeit wird die Weiterentwicklung des in Darmstadt vorhandenen Field-Cycling (FC) NMR-Magneten zu extrem kleinen Larmor-Frequenzen beschrieben. Das Magnetfeld wird je nach benötigter Stärke von verschiedenen Spulen erzeugt. Dabei werden äußere statische Felder durch drei senkrecht angeordnete, mit konstantem Strom betriebene Spulen kompensiert. Unterhalb von einem Kilohertz 1H Larmor-Frequenz wird das Magnetfeld über einen dreiachsigen Fluxgate-Sensor mit einer weiteren dreidimensionalen Anordnung von Spulen geregelt. Für Messungen in kleinen Magnetfeldern ist eine direkte Kalibri

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27

Hsu, Chia-Wei, and 許珈瑋. "Dynamic of Water in H-ZSM-5 by Fast Field Cycling NMR." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/9a8hr8.

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碩士<br>國立中正大學<br>化學暨生物化學研究所<br>102<br>FFC (Fast Field Cycling)NMR relaxometry is a very powerful tool to investigate the molecular dynamic at low frequency (0.01-40MHz) and study the slow molecular motions.Relaxation used in this present study has more advantages over mechanical field cycling.The important applications of FFC NMR includes proteins ,liquids which confined in porous materials ,and polymers. The relaxation rate of bulk and confined sample are different at low frequency region (0.01-40MHz). In this study ,nuclear magnetic relaxation dispersion (NMRD) is utilized to investigate the

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28

Chou, Ching-Yu, and 周靜瑜. "Probing protein dynamics by field cycling nuclear magnetic resonance (NMR) relaxation technique." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/67516712581967958725.

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博士<br>國立臺灣師範大學<br>物理學系<br>100<br>Spectral density function analysis is a direct description of protein dynamics and can be extracted from NMR relaxation measurements, such as spin-lattice relaxation (R1) dispersion. Toward that goal, we have built a field cycling device for measuring R1 field dispersion curves over the field range of 0-14.1T. The device permit the shuttling of solution protein samples in regular NMR tube to be shuttled up-and-down the 1 meter superconducting magnet bore stably and reproducibly in ~ 100 ms. Using this compact field cycling device, we have obtained the first set

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29

Tacke, Christian. "Resonanzen in Field-Cycling-NMR an Molekülkristallen: (reversible) Spindynamik oder (irreversible) Relaxation?" Phd thesis, 2015. https://tuprints.ulb.tu-darmstadt.de/4379/1/main.pdf.

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In Mehrspinsystemen mit Kernen vom Spin 1/2 und Kernen mit einer quadrupolaren Wechselwirkung, die über die Dipol-Dipol-Wechselwirkung gekoppelt sind, können sogenannte „Quadrupolare Dipps“ auftreten. Es gibt zwei Haupterklärungen für diesen Effekt: Polarisationstransfer und Relaxation. Die entsprechenden Messdaten ähneln sich sehr und ohne weitere Untersuchungen können diese in vielen Fällen nicht leicht unterschieden werden. Der physikalische und theoretische Hintergrund dieser beiden Phänomene unterscheidet sich sehr stark. Im Falle von keiner oder sehr langsamer Dynamik findet Polarisatio

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30

Hsieh, Chu-Jung, and 謝渠蓉. "Effects of Cholesterol on Membrane Molecular Dynamics by Fast Field-Cycling NMR Relaxometry." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/37917877191909869820.

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碩士<br>國立中正大學<br>化學暨生物化學研究所<br>101<br>Biological membranes are complex structures are composed of a variety of lipids and proteins. The different membrane compositions affect viscoelastic and hydrodynamic properties of membranes which are critical to their functions. Lipid bilayer vesicles inserted by cholesterol not only increase membrane surface motional behavior also strengthen vesicles stability. Cholesterol-rich vesicles are similar to cell membranes in structure and composition. Therefore, cholesterol-rich vesicles can be a typical model for studying membrane dynamic and function.

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31

董軒俐. "Dynamics of CD3OH and CH3OD in H-ZSM-5 by Fast Field Cycling NMR." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/9u5cgv.

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碩士<br>國立中正大學<br>化學暨生物化學研究所<br>104<br>The conversion of methanol to hydrocarbons using zeolite catalysts is one of the most investigated reactions in the field of industrial chemistry since its discovery in 1977. In this study, fast field-cycling (FFC) NMR was utilized to investigate the molecular dynamics of CH3OD and CD3OH with 10 %, 20 % and 30 % content in H-ZSM-5 at the temperature range of 218 K and 298 K. Three model-free curves were used for fitting NMRD profiles, corresponding to three different states of methanol or the product molecules in H-ZSM-5. The molecular motions at two of the

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32

Chang, Chia-Hao, and 張嘉豪. "Effect of Melittin and Pardaxin on Phospholipids Membrane by Fast Field-Cycling NMR Relaxometry." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/69835481756852603318.

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碩士<br>國立中正大學<br>化學暨生物化學研究所<br>104<br>Antimicrobial peptides are small amphiphilic molecules with antibacterial activity, generally between 5 and over a hundred amino acids. Until now, over 5000 kinds of antimicrobial peptides are found. Antimicrobial peptides can be divided mainly into four groups according to its secondary structure: (1) β-sheet, (2)α-helix, (3)extended, and (4)loop. Among these mentioned above, the β-sheet and α-helix are the most common structure. The antimicrobial peptides perform the antibacterial activity by attacking the membrane, which can be divided into the following

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33

YU, JIA-RU, and 余佳儒. "Effects of Calcium on Membrane Molecular Dynamics Studied by Fast Field-Cycling NMR Relaxometry." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/88267465574102336531.

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碩士<br>國立中正大學<br>化學暨生物化學研究所<br>101<br>Biomembranes, mostly composed of phospholipid molecules and proteins, forms a barrier between the intra- and extra-cellular environments and be able to control the material enters and exits the cell. Phospholipids can form bilayer structure (Lamellar phase, Lα phase) and nonbilayer structures (Inverted hexagonal phase, HII phase) in many bio-systems, particularly in regard to membrane fusion and exocytosis. HII phase are involved to destabilize membrane structures and membrane destabilization both in vivo and in vitro usually can be induced by external agen

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34

Kariyo, Sobiroh [Verfasser]. "Molecular dynamics of polymers by means of NMR field cycling relaxometry / vorgelegt von Sobiroh Kariyo." 2005. http://d-nb.info/975064592/34.

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35

Chen, Tsai-Chen, and 陳采榛. "Effects of Antimicrobial Peptides on Phospholipids Membrane Molecular Dynamics Studied by Fast-Field-Cycling NMR Relaxometry." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/44k2j4.

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碩士<br>國立中正大學<br>化學暨生物化學研究所<br>102<br>Antimicrobial peptides are small molecules with antibacterial activity, generally between 12 and 50 amino acids that are broadly effective components of innate immunity. Until now, antimicrobial peptides found have reached more than 2000 kinds. Antimicrobial peptides are usually acting on the cell membrane of bacteria, forming a channel in the cell membrane, which can be divided into the following three attack modes: (1) Toroidal model; (2) Barrel stave model; (3) Carpet model. There two antimicrobial peptides over the past two decades has been widely studi

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36

Wojciechowski, Miłosz. "Dynamika cieczy w ograniczonej geometrii : zastosowanie relaksometrii Magnetycznego Rezonansu Jądrowego." Praca doktorska, 2019. https://ruj.uj.edu.pl/xmlui/handle/item/148751.

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Praca "Dynamika cieczy w ograniczonej geometrii - zastosowanie relaksometrii Magnetycznego Rezonansu Jądrowego" opisuje szczegółowo analizę i interpretację dyspersji szybkości relaksacji spin-sieć jonożeli opartych na dwóch cieczy jonowych: Tiocyjanianie 1-etylo-3-metyloimidazoliowym ([EMIM][SCN]) oraz l-butylo-3-metyloimidazoliowym siarczanie oktylu ([BMIM][0cS04]). Mianem jonożeli określa się układy, w których ciecz jonowa została unieruchomiona w stałych matrycach. Dzięki takiemu zabiegowi można je w bezpieczniejszy sposób wykorzystać jak o elektrolity w urządzeniach elektronicznych, bateri

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37

Liu, Wei-Ting, and 劉威廷. "Effects of Calcium on Lipid/Cholesterol Mixed Membrane Molecular Dynamics Studied by Fast Field-Cycling NMR Relaxometry." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/4d68e9.

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碩士<br>國立中正大學<br>化學暨生物化學研究所<br>102<br>Biological membranes, mostly composed of phospholipid molecules and proteins, form a barrier between intra- and extra-cellular environments and allow to control the material enters and exits the cell. The changes of stability of the biological membranes are closely related to many physiological mechanisms, e.g., membrane fusion and exocytosis. The process can also be induced by adding external agents, such as calcium ions and sodium ions to the membrane surroundings, and investigated via analysis of the motion of the phospholipid molecules. 　　In this study,

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38

Ayalur-Karunakaran, Santhosh Kumar [Verfasser]. "Molecular dynamics of adsorbed polymer thin films using NMR field cycling relaxometry / vorgelegt von Santhosh Kumar Ayalur-Karunakaran." 2010. http://d-nb.info/1010970704/34.

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Manalu, Marison Sudianto. "Effects of the Peptide Bacitracin and Calcium on Phospholipids Membrane Molecular Dynamics Studied byFast-Field-Cycling NMR Relaxometry." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/77794200468964355001.

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碩士<br>國立中正大學<br>化學暨生物化學研究所<br>105<br>Biological membranes mostly composed of phospholipid molecules and proteins form a barrier between intra and extra-cellular environments and be able to control the material enters and exit the cell. Both in vivo and in vitro membrane destabilization can usually be induced by external agents such as bio molecules (i.e., proteins and peptides). Fast field cycling nuclear magnetic resonance relaxometry can provide valuable information because of it is sensitivity to dynamic process that occur over a broad time scale. Recorded the data for the large unilame

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Sailaja, Sesha A. "Proton magnetic relaxation investigations of correlation among molecular structure and dynamics in liquid crystals and fabrication of field cycling NMR spectrometer." Thesis, 1994. http://hdl.handle.net/2009/912.

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41

Kruber, Stephan. "Electroimanes de estructura variable para resonancia magnética nuclear con ciclado rápido de campo magnético." Doctoral thesis, 2015. http://hdl.handle.net/11086/5785.

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en este trabajo de tesis se proponen nuevos conceptos y métodos para el diseño de electroimanes ffc, con lo cual se define el estado actual del arte en la materia. se consideran sistemas basados en bobinados múltiples controlados individualmente y sistemas de electroimanes con geometría variable (siendo ésta la principal innovación que se aporta, definiendo el concepto de electroimán activo). ambos conceptos fueron a su vez desarrollados para eliminar los complejos procesos de maquinado necesarios en los electroimanes actualmente en uso a nivel global, lográndose otras ventajas que serían expu

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