On the relative merits of peak area and peak height measurement in electrothermal atomic absorption spectrometryC-13 NMRP-31 NMRMONOPHOSPHACROWNETHERSDIPHOSPHACROWN ETHERSNot Availabledoi:10.1016/0584-8547(93)80052-VPeter S. DoidgeSpectrochimica Acta Part B Atomic Spectroscopy...
NMR spectra were recorded by Jeol ECP-300, Jeol -400 and Bruker AMX-500 spectrom- eters, and chemical shifts are recorded as (ppm) using chloroform as an internal standard of 7.26 (1H) and 77.0 (13C) ppm. IR spectra were measured by a Hitachi 270- 30 infrared spectrophotometer. ...
Integration of the compound chromatogram (summation of all compound related ions) was used for determination of the peak area for QTOF-LCMS. The UV signal at 230 nm and the CAD and FID chromatograms were integrated without further data processing. A linear regression analysis was used to ...
Various molar ratios of I and II were then mixed with glycine, and the resulting peak area ratios of II to the area of the alpha and the carbonyl carbons of glycine was linearly related to the relative proportion of II in the mixture....
In recent years, Saturation Transfer Difference NMR (STD NMR) has been proven to be a powerful and versatile ligand-based NMR technique to elucidate crucial aspects in the investigation of protein-ligand complexes. Novel STD NMR approaches relying on “multi-frequency” irradiation have enabled us ...
The Khalal stage begins after fruit set and the fruit is green in color, Biser stage starts when the fruit is yellow, Rutab stage begins when a soft, brown area develops primarily on the bottom end of the fruit, and Tamar stage occurs when the entire fruit becomes soft, brown, and ...
With this reagent, the base peak chromatogram of the reaction mixture was dominated by multiple degradation products rather than by the expected MGO derivatives. Thus, the only intermediate response of the main derivative (m/z 296) and the corresponding high variance of this species may be the ...
The simulated and observed data were compared via statistical error measures like normalized bias (NBI), the normalized root mean square error (NMRSE), also known as the scatter index, and the correlation coefficient (CORR). Since the model performances are not uniform in space and time, all ...
(±0.05 °C). We recorded each spectrum 3 times at a resolution of 0.2 nm and calculated the value ofET(WB) from Equation (3), where λmaxrefers to the wavelength of maximum absorption of the solvent-sensitive (i.e., solvatochromic) peak of WB. We calculated the values of λmaxfrom ...
The depolymerization of the silicate network in the hydrated layer of altered glasses was demonstrated on the basis of NMR and Raman spectra [30,32,34]. Si enrichment is a recurring feature of the hydrated layer, and it has also been observed in glasses that are aged up to 1 year in a...