Results 41 to 50 of about 5,409,859 (340)

Insights into ultrasound-promoted degradation of naphthenic acid compounds in oil sands process affected water. Part I: Accelerated H-abstraction and decarboxylation of aromatic and alicyclic compounds

open access: yesUltrasonics Sonochemistry, 2022
Propelled by enormous increase in demand for fuel sources, Canadian oil sands are becoming increasingly important as a fuel source due to their abundance and upgrading capability.
Rija Ansari, Deepak M. Kirpalani
doaj  

Valorization of Lignin by Partial Wet Oxidation Using Sustainable Heteropoly Acid Catalysts

open access: yesMolecules, 2017
The production of carboxylic acids by partial wet oxidation of alkali lignin at elevated temperatures and pressures was studied experimentally. Two different heteropoly acids, phosphotungstic acid (H3PW12O40) and phosphomolybdic acid (H3PMo12O40), were ...
Abayneh Getachew Demesa   +3 more
doaj   +1 more source

Production of medium-chain carboxylic acids by Megasphaera sp MH with supplemental electron acceptors [PDF]

open access: yes, 2016
Background: C5-C8 medium-chain carboxylic acids are valuable chemicals as the precursors of various chemicals and transport fuels. However, only a few strict anaerobes have been discovered to produce them and their production is limited to low ...
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core   +1 more source

Crystal structure of zymonic acid and a redetermination of its precursor, pyruvic acid

open access: yesActa Crystallographica Section E: Crystallographic Communications, 2019
The structure of zymonic acid (systematic name: 4-hydroxy-2-methyl-5-oxo-2,5-dihydrofuran-2-carboxylic acid), C6H6O5, which had previously eluded crystallographic determination, is presented here for the first time.
Dominik Heger   +3 more
doaj   +1 more source

Diamondoids are not forever: microbial biotransformation of diamondoid carboxylic acids

open access: yesMicrobial Biotechnology, 2020
Summary Oil sands process‐affected waters (OSPW) contain persistent, toxic naphthenic acids (NAs), including the abundant yet little‐studied diamondoid carboxylic acids.
Benjamin D. Folwell   +2 more
doaj   +1 more source

Influence of ligand shape and steric hindrance on the composition of the nanocrystal ligand shell [PDF]

open access: yes, 2015
Organic ligands play a key role in the synthesis of colloidal semiconductor nanocrystals or quantum dots. Generally they consist of a functional group and an aliphatic chain, with carboxylic acids, thiols and phosphonic acids as typical examples.
De Nolf, Kim   +3 more
core   +1 more source

Mechanistic Insights into the Enantioselective Epoxidation of Olefins by Bioinspired Manganese Complexes: Role of Carboxylic Acid and Nature of Active Oxidant

open access: yes, 2018
Bioinspired manganese and iron complexes bearing nonporphyrinic tetradentate N4 ligands are highly efficient catalysts in asymmetric oxidation reactions by hydrogen peroxide (H2O2), in which carboxylic acid is employed as an essential additive to improve
Junyi Du   +6 more
semanticscholar   +1 more source

Structures of carboxylic acid reductase reveal domain dynamics underlying catalysis

open access: yesNature Chemical Biology, 2017
Carboxylic acid reductase (CAR) catalyzes the ATP- and NADPH-dependent reduction of carboxylic acids to the corresponding aldehydes. The enzyme is related to the non-ribosomal peptide synthetases, consisting of an adenylation domain fused via a peptidyl ...
D. Gahloth   +9 more
semanticscholar   +1 more source

Circulating histones as clinical biomarkers in critically ill conditions

open access: yesFEBS Letters, EarlyView.
Circulating histones are emerging as promising biomarkers in critical illness due to their diagnostic, prognostic, and therapeutic potential. Detection methods such as ELISA and mass spectrometry provide reliable approaches for quantifying histone levels in plasma samples.
José Luis García‐Gimenez   +17 more
wiley   +1 more source

Crystal structure of [1,1′:3′,1′′-terphenyl]-2′,3,3′′-tricarboxylic acid

open access: yesActa Crystallographica Section E: Crystallographic Communications, 2015
The asymmetric unit of the title compound, C21H14O6, comprises two symmetrically independent molecules that form a locally centrosymmetric hydrogen-bonded dimer, with the planes of the corresponding carboxylic acid groups rotated by 15.8 (1) and 17.5 (1)°
Daniel A. Decato, Orion B. Berryman
doaj   +1 more source

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