Assignment of gas-phase dipeptide amide hydrogen exchange rate constants by site-specific substitution: GlyGly

Article Abstract:

An assignment that helps in determining the H/D exchange rate constants for the N-terminal ammonium, amide hydrogen and carboxyl hydrogens in diglycine, based on comparison of site-specific gas-phase H/D exchange rate constants for diglycine (GlyGly) and its selectively methylated homologues is presented. The results show that the same (fast) reaction rate constant is demonstrated by the three N-terminal ammonium protons of protonated diglycine, amide hydrogen has intermediate reaction rate constant and carboxylic proton has the slowest exchange rate.

Industrial Gas Manufacturing, Industrial gases, Hydrogen, Peptides, Amides

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Gas-phase production of molybdenum carbide, nitride, and sulfide clusters and nanocrystallites

Article Abstract:

The formation of neutral molybdenum, carbide, nitride and sulfide clusters and nanocrystallites using a laser ablation plasma reactor is investigated. Mass distributions, stability, and reactivity of neutral and charged clusters of a wide range of transition-metal compounds consisting of a few atoms to very large particles containing more than 100 metal atoms is explored.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Molybdenum Compounds, Usage, Optical properties, Transition metal compounds, Ablation (Vaporization technology), Atomic properties, Laser ablation

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