نتایج جستجو برای: دوتریوم nmr
تعداد نتایج: 58884 فیلتر نتایج به سال:
A generalized 2D correlation NMR (GEN2D-NMR) scheme capable of substantially reducing the experimental time for two-dimensional correlation NMR experiments is described. The experimental time used in GEN2D-NMR is shortened to less than one-tenth of that required in traditional double Fourier transform 2D-NMR (FT2D-NMR) for a 13C-13C spin diffusion experiment for Nephila edulis spider threads. E...
تشدید مغناطیسی هسته ای (nmr) پاسخ هسته های اتمی به میدان های مغناطیسی خارجی است. در این تحقیق به بررسی روش نوین mril (چاه پیمایی به روش تشدید مغناطیسی هسته ای) جهت تعیین پارامترهای پتروفیزیکی مورد نیاز از قبیل تخلخل و توزیع اندازه حفره ها که در تخمین هیدروکربن موجود در مخزن به کار گرفته می شود، می پردازیم. برای این منظور، ابتدا پارامتر تخلخل با پردازش داده های nmr محاسبه شده و سپس تخلخل حاصل با...
9.1 Saturation Transfer Difference NMR Principle ......... " 149 9.2 STD-NMR for Characterizing Ligand Binding to Membrane Integrated Proteins. . . . . . . . . . . . . . . . . . .. 153 9.3 Epitope Mapping with STD-NMR . . . . . . . . . . . . . . . . . .. 157 9.4 Group Epitope Mapping with STD-NMR .............. l57 9.5 Binding Constants from STD-NMR Experiments ......... 160 9.6 STD-NMR Analysi...
Body's iterative force-field computer program has been used to calculate strain energies in cyclooctanone (I). 348 MHZ 1H NMR spectra of (I) have been investigated over the temperature range of 25° to -160°C. Two conformation processes affect the 1H NMR spectrum of (I). Iterative force-field calculations on the conformations and conformational interconversion paths of ...
α-acyloxycarboxamides are synthesized from three component Passerini reaction between indane-1,2,3-trione, isocyanides, and thiophenecarboxylic acids in quantitative yields. The structures of the final products were confirmed by IR, 1H and 13C NMR spectroscopy, mass spectrometry, and elemental analysis. The B3LYP/HF calculations for computation of 1H an...
LC−NMR has been extensively used for determination and elucidation of chemical structures [1]. In such applications, NMR often suffers poor sensitivity of signal detection. Therefore, stop− flow LC−NMR method, in which flow of LC is stopped when an analyte enters NMR detector, is widely used in order to obtain spectra with sufficient signal to noise ratio to analyze. NMR has been also known tha...
What we call “nuclear magnetic resonance” (NMR) was developed simultaneously but independently by Edward Purcell and Felix Bloch in 1946. The experimental method and theoretical interpretation they developed is now called “continuous-wave NMR” (CWNMR). A different experimental technique, called “pulsed NMR” (PNMR), was introduced in 1950 by Erwin Hahn. Pulsed NMR is used in magnetic resonance i...
The field of zero- to ultralow-field (ZULF) nuclear magnetic resonance (NMR) is currently experiencing a rapid growth, owing the progress in optical magnetometry, and also attractive features ZULF NMR, such as low hardware cost excellent spectral resolution achieved under conditions. In this work, an approach proposed demonstrated for simultaneous acquisition ZULF-NMR spectra individual 13C-con...
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