نتایج جستجو برای: nuclear magnetic resonancenmr

تعداد نتایج: 553955  

Journal: :Nature communications 2013
Hai-Jing Wang Chang S Shin Claudia E Avalos Scott J Seltzer Dmitry Budker Alexander Pines Vikram S Bajaj

Dynamic nuclear polarization, which transfers the spin polarization of electrons to nuclei, is routinely applied to enhance the sensitivity of nuclear magnetic resonance. This method is particularly useful when spin hyperpolarization can be produced and controlled optically or electrically. Here we show complete polarization of nuclei located near optically polarized nitrogen-vacancy centres in...

Journal: :Quarterly reviews of biophysics 2015
A David Buckingham

Nuclear magnetic resonance is the most important form of molecular spectroscopy in chemistry and biochemistry but it is normally blind to chirality. It was predicted in 2004 that precessing nuclear spins in chiral molecules in a liquid in a strong magnetic field induce a rotating electric polarization that is of opposite sign for enantiomers. This polarization arises from the distortion of the ...

Journal: :European Journal of Biochemistry 2005

Journal: :Journal of Japan Oil Chemists' Society 1962

Journal: :Acta Crystallographica 1963

Journal: :Progress of Theoretical Physics 1956

Journal: :Nature Reviews Methods Primers 2021

Nuclear magnetic resonance (NMR) spectroscopy is a principal analytical technique used for the structure elucidation of molecules. This Primer covers different approaches to accelerate data acquisition and increase sensitivity NMR measurements through parallelization, enabled by hardware design and/or pulse sequence development. Starting with hardware-based methods, we discuss coupling multiple...

Journal: :مجله دانشکده پزشکی دانشگاه علوم پزشکی تهران 0
عباس تکاور a takavar

basic physical principles of nuclear magnetic resonance imaging (n.m.r.i), a nonionizing medical imaging technique, are described. principles of nmri with other conventional imaging methods, ie, isotope scanning, ultrasonography and radiography have been compared. t1 and t2 and spin density (s.d.) factors and different image construction techniques based on their different combinations is discu...

Journal: :Journal of Neurology, Neurosurgery & Psychiatry 1985

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