نتایج جستجو برای: nmr spectrometer
تعداد نتایج: 79900 فیلتر نتایج به سال:
Abstract Since its first publication in 2011, the program “Insensitive” has progressed to be one of most feature-rich, educational simulation tools for nuclear magnetic resonance experiment homogeneous solution. It can used without prior knowledge a programming language or complex spectrometer software. In four steps it follows spin physics behind NMR, from creation system acquisition and proce...
Distinction between α-and γ-Glutamyl Dipeptides by Means of NMR Spectrometer and Amino Acid Analyzer
This study aims at characterization of the anti-cancer active compounds separated from stems and branches Sambucus williamsii var. coreana Nakai (Caprifoliaceae). Bioactivity-guided fractionation ethanol extracts S. was isolated three triterpenoid compounds. fractions showed superior growth inhibitory activity against cancer cells (HCT116, A549 MDA-MB231). Active fraction analyzed led to identi...
Magnetic levitation has been proposed as an alternative approach to simulate on Earth microgravity conditions encountered in space, allowing the investigation of weightlessness on materials and biological systems. In general, very strong magnetic fields, 15 T or higher, are required to achieve levitation for a majority of diamagnetic substances. Here, we show that it is possible to achieve levi...
Within the tumor suppressor protein INK4 ~inhibitor of cyclin-dependent kinase 4! family, p15INK4B is the smallest and the only one whose structure has not been determined previously, probably due to the protein’s conformational flexibility and instability. In this work, multidimensional NMR studies were performed on this protein. The first tertiary structure was built by comparative modeling w...
My NMR career started in 1980 when I joined the Division of Molecular Pharmacology at the Medical Research Council’s National Institute of Medical Research (NIMR) located in Mill Hill, London. I had been recruited 18 months previously by the director of NIMR, Sir Arnold Burgen, while still a medical student at University College Hospital Medical School, on the basis of the work I had published ...
Conventional nuclear magnetic resonance spectroscopy is unable to distinguish between the two mirror-image forms (enantiomers) of a chiral molecule. This is because the NMR spectrum is determined by the chemical shifts and spin–spin coupling constants which – in the absence of a chiral solvent – are identical for the two enantiomers. We discuss how chirality may nevertheless be directly detecte...
Combined low-temperature NMR/UV-vis spectroscopy (UVNMR), where optical and NMR spectra are measured in the NMR spectrometer under the same conditions, has been set up and applied to the study of H-bonded anions A··H··X(-) (AH = 1-(13)C-2-chloro-4-nitrophenol, X(-) = 15 carboxylic acid anions, 5 phenolates, Cl(-), Br(-), I(-), and BF(4)(-)). In this series, H is shifted from A to X, modeling th...
The determination of the centre-of-mass energies for all LEP 2 running is presented. Accurate knowledge of these energies is of primary importance to set the absolute energy scale for the measurement of the W boson mass. The beam energy between 80 and 104 GeV is derived from continuous measurements of the magnetic bending field by 16 NMR probes situated in a number of the LEP dipoles. The relat...
BACKGROUND Celiac disease (CD) is a disorder associated with body reaction to gluten. After the gluten intake, an immune reaction against the protein occurs and damages villi of small intestine in celiac patients gradually. OBJECTIVES The OSC, a filtering method for minimization of inter- and intra-spectrometer variations that influence on data acquisition, was applied to biofluid NMR data of...
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