Nuclear magnetic resonance acquiring

The Al magic angle spinning nuclear magnetic resonance (MASNMR) spectra were acquired using a 30 pulse at 0.1 sec. intervals. About 5000 to 7000 scans were acquired on a Bruker AM-400. The chemical shift is relative to aluminum nitrate in water solution which contains A1(H20)6. ... 

Solid-state C variable-amplitude cross polarization magic-angle spinning (VACP/MAS) nuclear magnetic resonance (NMR) spectra were acquired for the sorbitol samples. Proton decoupling was achieved by a two-pulse phase modulation (TPPM) sequence. Identical C spectra were measured for the y-form sorbitol samples, and a representative spectrum is shown in Figure 9. 

The chemical properties of these complexes, together with their infrared and high resolution nuclear magnetic resonance spectra, show that the cyclopentadiene group is bound to the iron atom as shown in (XXII). By sharing the six Tr-elccIrons of the benzene molecule and the four -electrons of the cyclopentadiene molecule, the iron(O) atom acquires the electronic configuration of krypton. 

D. Morvan, A. Demidem, J. Papon, M. De Latour and J. C. Madelmont, Melanoma tumors acquire a new phospholipid metabolism phenotype under cystemustine as revealed by high-resolution magic angle spinning proton nuclear magnetic resonance spectroscopy of intact tumor samples, Cancer Res., 2002, 62, 1890-1897. 

Use of an integrated system incorporating CCC separation, PDA detector, and LC-MS proved to be a valuable tool in the rapid identification of known compounds from microbial extracts.6 This collection of analytical data has enabled us to make exploratory use of advanced data analysis methods to enhance the identification process. For example, from the UV absorbance maxima and molecular weight for the active compound(s) present in a fraction, a list of potential structural matches from a natural products database (e.g., Berdy Bioactive Natural Products Database, Dictionary of Natural Products by Chapman and Hall, etc.) can be generated. Subsequently, the identity of metabolite(s) was ascertained by acquiring a proton nuclear magnetic resonance ( H-NMR) spectrum. 

Basic information on the nuclear magnetic resonance (NMR) properties of pyrroles and their benzo derivatives is collected in CHEC(1984) <1984CHEC(4)155> and CHEC-II(1996) <1996CHEC-II(2)1>. Only recently acquired data or new structurally relevant interpretations of old data based are reported here. 

Initially an extensive literature search was conducted to identify key world oil shales, i.e., deposits of large size and/or of current interest to potential developers. The resulting information was used to select a few key world oil shales. Thirteen oil shale samples from eight different countries were studied. Samples were acquired from each of the following countries Australia, Brazil, Israel, Sweden, the United States, and Yugoslavia. Two samples were acquired from Morocco and five samples were acquired fr qj the People s Republic of China. Fischer, Ultimate, Rock-Eval, C Nuclear Magnetic Resonance Spectroscopy (NMR), and X-ray Diffraction Mineral analyses were performed on the samples to identify their compositional characteristics. 

Normally signals are sampled at regular intervals, for example, a ultraviolet/visible (UV/vis) spectrum may be sampled every nm, or a Fourier transform nuclear magnetic resonance (FT-NMR) spectrum every ms, usually the interval is regularly spaced. However, it is important always to check the units of the raw data, although, for example, mid-infrared (IR) spectra could be presented either in units of cm or nm, generally the signals are evenly acquired in intervals based on cm . ... 

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