Results 1 to 10 of about 149,778 (264)
Peptide radical cations: gender determines dissociation chemistry. [PDF]
Mass Spectrom (Tokyo), 2013 Peptide radicals play a significant role in biology as well as mass spectrometry. They can be differentiated into two groups: conventional hydrogen-deficient radicals, e.g. M(+•) as in electron ionization, and much more rare hydrogen-abundant radicals, e.g. [M+2H](+•), as in electron capture/transfer dissociation.
A Zubarev R.
europepmc +4 more sources
Electron Attachment to 5-Fluorouracil: The Role of Hydrogen Fluoride in Dissociation Chemistry. [PDF]
Int J Mol Sci, 2022 We investigate dissociative electron attachment to 5-fluorouracil (5-FU) employing a crossed electron-molecular beam experiment and quantum chemical calculations. Upon the formation of the 5-FU− anion, 12 different fragmentation products are observed, the most probable dissociation channel being H loss.
Arthur-Baidoo E +5 more
europepmc +3 more sources
Frontiers in Marine Science, 2022 We investigated the pore fluid and methane-derived authigenic carbonate (MDAC) chemistry from the ARAON Mounds in the Chukchi Sea to reveal how methane (CH4) seepage impacts their compositional and isotopic properties.
Ji-Hoon Kim +15 more
doaj +1 more source
A pain-causing and paralytic ant venom glycopeptide
iScience, 2021 Summary: Ants (Hymenoptera: Formicidae) are familiar inhabitants of most terrestrial environments. Although we are aware of the ability of many species to sting, knowledge of ant venom chemistry remains limited.
Samuel D. Robinson +14 more
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Dissociation chemistry of hydrogen halides in water [PDF]
The Journal of Chemical Physics, 2004 To understand the mechanism of aqueous acid dissociation, which plays a fundamental role in aqueous chemistry, the ionic dissociation of HX acids (X=F, Cl, Br, and I) in water clusters up to hexamer is examined using density functional theory and Møller–Plesset second-order perturbation methods (MP2).
Odde, S +4 more
openaire +3 more sources
Migration of Salt Ions in Frozen Hydrate-Saturated Sediments: Temperature and Chemistry Constraints
Geosciences, 2022 Migration of dissolved salts from natural (cryopeg brines, seawater, etc.), or artificial sources can destabilize intrapermafrost gas hydrates. Salt transport patterns vary as a function of gas pressure, temperature, salinity, etc. The sensitivity of the
Evgeny Chuvilin +5 more
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On basis set optimisation in quantum chemistry [PDF]
ESAIM: Proceedings and Surveys, 2023 In this article, we propose general criteria to construct optimal atomic centered basis sets in quantum chemistry. We focus in particular on two criteria, one based on the ground-state one-body density matrix of the system and the other based on the ...
Cancès Eric +3 more
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Dissociation Chemistry of Hydrogen-Deficient Radical Peptide Anions [PDF]
Journal of the American Society for Mass Spectrometry, 2011 The fragmentation chemistry of anionic deprotonated hydrogen-deficient radical peptides is investigated. Homolytic photodissociation of carbon-iodine bonds with 266 nm light is used to generate the radical species, which are subsequently subjected to collisional activation to induce further dissociation.
Moore, Benjamin +6 more
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MODELLING OF ACIDS AND BASES REVISITED
Studia Universitatis Babes-Bolyai Chemia, 2022 Models for dissociation and mixing of acids and bases are the main subject of many analytical chemistry textbooks. Preparing the solutions for any titration generally involves diluting acids and bases. The mathematics behind precise calculation of pH and
Lorentz JÄNTSCHI
doaj +1 more source
Liquids, 2023 This work focuses on determining the dissociation constants (pKa) of eight amines, namely, 3-(Diethylamino) propylamine, 1,3-Diaminopentane, 3-Butoxypropylamine, 2-(Methylamino) ethanol, Bis(2-methoxyethyl) amine, α-Methylbenzylamine, 2-Aminoheptane, and
Venkata Sai Priyatham Varma Alluri +2 more
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