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The addition of organic acids (picric, oxalic, citric, or tartaric) to peptide and protein samples was found to significantly increase the yield of their quasi-molecular ions (QMI) in time-of-flight 252Cf plasma desorption mass spectrometry. The yield of the ions depended on the pKa of the acid added.
The experimental results are presented of a study of new extended defects morphology in Si. It is shown that the defects generated by moving 60-dislocation lie in the dislocation slip plane. h110i and h112i axes of the defects are found and {113} and {115} habit planes are supposed. It is assumed that the peculiarities of the atomic structure of split(More)
The study of homo- and heterocluster quasimolecular ions of 20 L-amino acids (A) and five dipeptides by the TOF-PDMS method indicated that the intensity of quasimolecular ions of the corresponding homo-([An + H]+ and [Bm + H]+, where A and B are biomolecules (A, dipeptides), n and m = 1 .... 5) and heteroclusters ([An.Bm + H]+, n and m = 1 .... 5) depends(More)
Using a 13 O beam, we have observed proton decays of 12 N and 13 O excited states following proton-knockout and inelastic interactions on a 9 Be target. The excited states were determined from detected two-and three-body exit channels using the invariant mass method. The width of the second excited state of 12 N was determined to be 55(20) keV, considerably(More)
In this paper as an indicator manifestations of geodynamic processes in a large area are invited to select the most sensitive and informative geological structures to the appearance of endogenous and exogenous factors that contribute to the development of geodynamic processes and negative changes in the geological section. Such places are key geodynamic(More)
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