Two compounds were designed, synthesized, and characterized by 1H-nuclear magnetic resonance (1H-NMR), ultraviolet (UV)-visible, and matrix-assisted laser desorption/ionization (MALDI) mass spectra.
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Two ionization techniques: electro spray ionization (ESI) and atmospheric pressure chemical ionization (APCI) were used in this work.
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Because of the ionization equilibrium, these three antioxidants have the same ion form in solutions at a definite pH value and therefore their apparent rate constants were essentially the same.
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The structure of 3 was characterized by 1H-nuclear magnetic resonance (NMR) and electrospray ionization-mass spectrometry (ESI-MS).
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A relative quantitative method for differential proteomics by cleavable isotope-coded affinity tag (cICAT) and matrix-assisted laser desorption/ionization tandem timeof-flight mass spectrometry (MALDI-TOF-MS) was established.
Measurement of the intensity of total scattering of x-rays by a number of polyatomic gases was made for scattering angles between 15° and 130 ° using an ionization method of recording the scattered intensity. Balanced filters of ZrO2, and SrO were used to separate the MoKa rays and Soller slits were placed in front of the ionization chamber to obtain a definite scattering angle. The gases studied are CL2, CO2, N2O, H2S, CC14 and CHCl3. In each case the absolute values of the scattered intensity ...
This is a brief report of the measurements by the method of critical penetration frequency of the maximum intensities of ionization in the ionospheric layers during the partial solar eclipse of June 19, 1936 at Shanghai. The results support the ultra-violet light theory of ionization in the F1 layer. For the E layer these results suggest that a considerable part of the ionization may be due to agents different from ultraviolet light.