نتایج جستجو برای: nuclear magnetic resonance nmr
تعداد نتایج: 655831 فیلتر نتایج به سال:
Rhodamine 6G-chromone-derived compounds RD1 - RD4 have been synthesized by condensation of rhodamine 6G hydrazide and substituted chromone aldehydes in ethanol using microwave-assisted reaction. The structures these derivatives were confirmed proton nuclear magnetic resonance (1H-NMR), carbon (13C-NMR), high-resolution mass spectra data (HRMS). Colorimetric photophysical studies show the select...
Metabolic alterations are known to occur with oncogenesis and tumor progression. During malignant transformation, the metabolism of cells and tissues is altered. Cancer metabolism can be studied using advanced technologies that detect both metabolites and metabolic activities. Identification, characterization, and quantification of metabolites (metabolomics) are important for metabolic analysis...
We theoretically propose a scheme for verification of quantum Zeno effect (QZE) to suppress a decay process with Nuclear Magnetic Resonance (NMR). Nuclear spins are affected by low frequency noise, and so one can naturally observe non-exponential decay behavior, which is prerequisite in observing QZE. We also describe that a key component for QZE, namely measurements on the nuclear spin, can be...
Using a set of six (1)H-detected triple-resonance NMR experiments, we establish a method for sequence-specific backbone resonance assignment of magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectra of 5-30 kDa proteins. The approach relies on perdeuteration, amide (2)H/(1)H exchange, high magnetic fields, and high-spinning frequencies (ωr/2π ≥ 60 kHz) and yields high-quality NMR d...
We have developed a stripline-based microfluidic device for on-chip microscale nuclear magnetic resonance (NMR), which is characterized by performing NMR experiments on a 0.2 μl ethanol sample. This NMR stripline-based device, which has an improved mechanical stability, presents an enhanced sensitivity (3.7·10 spins/ (Hz)) and achieves a full-width-half-maximum linewidth of 2.35 Hz.
Introduction Pulsed nuclear magnetic resonance (NMR) was first introduced in the 1940’s by Felix Bloch and Edward Purcell. Bloch and Purcell developed methods for determining the magnetic moments of nuclei in solids and liquids. One can use pulsed NMR to identify characteristic properties of various samples. More recently, the technique of functional magnetic resonance imaging (fMRI) has contri...
Two rather similar historical evolutions are evoked, each one originating in fundamental spin studies by physicists, and ending as magnetic resonance imaging (MRI), a set of invaluable tools for clinical diagnosis in the hands of medical doctors. The first one starts with the early work on nuclear magnetic resonance, the founding stone of the usual proton-based MRI, of which the basic principle...
Functional brain mapping with magnetic resonance imaging (MRI) is a rapidly growing field that has emerged in only the past several years. Functional MRI (fMRI) is the use of MRI equipment to detect regional changes cerebral metabolism or in blood flow, volume or oxygenation in response to task activation. The most popular technique utilizes blood oxygenation level dependent (BOLD) contrast, wh...
We report the observation of nuclear magnetic resonance (NMR) in a ferromagnet-semiconductor heterostructure in the presence of a spin-polarized current. Spin-polarized electrons injected from a metallic ferromagnet generate a large nuclear spin population in a GaAs quantum well by dynamic polarization. The characteristic time for the polarization process is approximately 20 sec, and the nuclea...
The vast majority of magnetic resonance imaging and spectroscopic investigations make use of nuclear magnetic resonance (NMR), exploiting the interactions of atomic nuclei with applied static and radiofrequency magnetic fields. Nevertheless, there exists another important “flavour” of magnetic resonance, called Electron Spin Resonance (ESR) – or, interchangeably, Electron Paramagnetic Resonance...
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