Results 51 to 60 of about 4,994,766 (232)

Susceptibility functions for slow relaxation processes in supercooled liquids and the search for universal relaxation patterns [PDF]

, 2002
In order to describe the slow response of a glass former we discuss some distribution of correlation times, e.g., the generalized gamma distribution (GG) and an extension thereof (GGE), the latter allowing to reproduce a simple peak susceptibility such as of Cole-Davidson type as well as a susceptibility exhibiting an additional high frequency power ...
arxiv   +1 more source

Picolinic acid promoted oxidative decarboxylation of phenylsulfinylacetic acid by Cr(VI)

Bulletin of the Chemical Society of Ethiopia, 2016
The kinetics and mechanism of picolinic acid promoted reaction of phenylsulfinylacetic acid (PSAA) with Cr(VI) was carried out in aqueous acetonitrile medium under pseudo first order conditions. The reaction follows Michaelis-Menten type of kinetics with respect to PSAA.
P. Subramaniam, N. T. Selvi
openaire   +4 more sources

Copper(II) Inhibition of the SARS‐CoV‐2 Main Protease

Natural Sciences, EarlyView.
Molecular Docking of Cu(II) Schiff‐Base Chelates to SARS‐CoV‐2 Mpro. Two distinct Cu(II) chelates (Cu(II)Lp and Cu(II)Lm) are shown docked within the active site pocket of the Mpro, interacting with key residues HIS 41 and CYS 145. ABSTRACT In an analysis of the structural stability of the coronavirus main protease (Mpro), we identified regions of the ...
Roberto A. Garza‐López, Liam Kwak, Andrew Chung, Gabriel L. Ancajas, John J. Kozak, Harry B. Gray   +5 more
wiley   +1 more source

Meteoritic Abundances of Fatty Acids and Potential Reaction Pathways in Planetesimals [PDF]

Icarus, 2019, 319, 685-700, 2018
The origin of fatty acids on the prebiotic Earth is important as they likely formed the encapsulating membranes of the first protocells. Carbon-rich meteorites (i.e., carbonaceous chondrites) such as Murchison and Tagish Lake are well known to contain these molecules, and their delivery to the early planet by intense early meteorite bombardments ...
arxiv   +1 more source

Catechol 2,3-Dioxygenase-catalyzed Synthesis of Picolinic Acids from Catechols

, 1994
Various picolinic acid derivatives were synthesized from ammonia and hydroxymuconic semialdehyde derivatives that were oxidatively prepared from various catechols by the action of Pseudomonas catechol 2,3-dioxygenase (C23O, metapyrocatechase).
Y. Asano, Yasushi Yamamoto, H. Yamada
semanticscholar   +1 more source

Visible Light–Induced Decarboxylative Radical Addition of Heteroaromatic Carboxylic Acids to Alkenes at Room Temperature in Two‐Molecule Photoredox System

ChemistryOpen, EarlyView.
The photoinduced decarboxylative radical addition of aryl carboxylic acids, including heteroaromatic carboxylic acids, to electron‐deficient alkenes is achieved in a two‐molecule photoredox system using a combination of biphenyl and 9,10‐dicyanoanthracene without heating or base.
Daisuke Suzuki, Ryoga Hashimoto, Toshiki Furutani, Mugen Yamawaki, Hirotsugu Suzuki, Yasuharu Yoshimi   +5 more
wiley   +1 more source

Antibiotic‐Induced Dysbiosis of the Gut Microbiota Shifts Host Tryptophan Metabolism and Increases the Susceptibility of Mice to Pulmonary Infection With Pseudomonas aeruginosa

Immunology, EarlyView.
Antibiotic‐induced dysbiosis of the gut microbiota shifts host tryptophan metabolism and impairs the innate immune response during Pseudomonas aeruginosa pulmonary infection. (A) Eubiosis: During eubiosis, the intestinal microbiota metabolises tryptophan into indole metabolites, which keeps tryptophan levels within normal serum concentrations. However,
Camila Bernardo de Brito, Raquel Duque do Nascimento Arifa, Rafael de Oliveira Bezerra, Carlos Eduardo Dias Igídio, Bárbara Maria de Amorim‐Santos, Anna Clara Paiva de Menezes Santos, Larissa Mendes Barbosa, João Paulo Pezzini Barbosa, Larissa Marcely Gomes Cassiano, Markus Kohlhoff, Micheli Fagundes, Rafaela Ribeiro Álvares Batista, Celso Martins Queiroz‐Junior, Alessandra M. Saliba, Juliana Divina Almeida Raposo, Fernão Castro Braga, Roney Santos Coimbra, Mauro Martins Teixeira, Caio Tavares Fagundes, Danielle G. Souza   +19 more
wiley   +1 more source

APCI‐Multistage Mass Spectrometry Following Liquid Chromatography for Selected 4‐Desmethyl‐Sterols and Their Deuterium‐Labelled Analogues Unveils Characteristic Fragmentation Routes for Cholesterol and Phytosterols Identification

Rapid Communications in Mass Spectrometry, Volume 39, Issue 13, 15 July 2025.
ABSTRACT Rationale Several phytosterols (PSs), well known for their role in plant physiology and their health benefits, represent a subset of the family of 4‐desmethyl‐sterols. They exhibit remarkable structural variability due to differences in the number and position of C=C bonds in their tetracyclic backbone and side chain composition. When analysed
V. Cinquepalmi, I. Losito, A. Castellaneta, C. D. Calvano, T. R. I. Cataldi   +4 more
wiley   +1 more source

The limitation for popular descriptions of alpha-relaxation temperature dependence [PDF]

arXiv, 2011
Applicability of three popular functions (Vogel-Fulcher-Tammann, double activation law and frustration-limited domains model) for the description of the temperature dependence of alpha-relaxation time tau_alpha is considered for three typical glass-formers (propylene carbonate, ethanol and picoline). Two first functions have three free parameters.
arxiv  

Geometric-algebraic approach to aqueous solutions of diprotic acids and its buffer mixtures [PDF]

arXiv, 2023
A closed-form analytical expression for $\ce{[H3O+]}$ has been obtained for aqueous solutions of diprotic acids and its soluble salts. This formula allows to calculate the pH of aqueous solutions of diprotic acids, their buffer solutions, and the titrations of these two by a strong base, from the values of p$K_1$, p$K_2$, and the effective ...
arxiv