Results 21 to 30 of about 35,652 (256)

Nanoporous Carbon Electrodes Derived from Coffee Side Streams for Supercapacitors in Aqueous Electrolytes

open access: yesNanomaterials, 2022
Coffee, as one of the most traded resources, generates a vast amount of biogenic by-products. Coffee silver skins (CSS), a side stream from the roasting process, account for about 4 wt.%.
Julian Selinger   +9 more
doaj   +1 more source

A novel quinone: Quinone methide isomerase generates quinone methides in insect cuticle

open access: yesFEBS Letters, 1988
Insoluble cuticle‐bound enzyme(s) of Manduca sexta pharate pupae, which is known to convert N‐acetyldopamine to N‐acetylnorepinephrine through the intermediate formation of quinone methide, also converted exogenously supplied N‐acetyldopamine quinone to N‐acetylnorepinephrine.
Saul, Steven, Sugumaran, Manickam
openaire   +2 more sources

It Takes Two to Tango, Part II: Synthesis of A-Ring Functionalised Quinones Containing Two Redox-Active Centres with Antitumour Activities

open access: yesMolecules, 2023
In 2021, our research group published the prominent anticancer activity achieved through the successful combination of two redox centres (ortho-quinone/para-quinone or quinone/selenium-containing triazole) through a copper-catalyzed azide-alkyne ...
Joyce C. Oliveira   +12 more
doaj   +1 more source

A Simple and Robust Model for Predicting the Reduction Potential of Quinones Family; Electrophilicity Index Effect

open access: yesInternational Journal of Electrochemical Science, 2012
This paper describes a procedure revealing the relationship between quantum chemical indices and electronic descriptors as independent variables and half-wave potential (E1/2) of quinones family as a dependent variable.
A. Beheshti, P. Norouzi, M.R. Ganjali
doaj   +1 more source

Polyphenol-Protein Complexes and Their Consequences for the Redox Activity, Structure and Function of Honey. A Current View and New Hypothesis – a Review

open access: yesPolish Journal of Food and Nutrition Sciences, 2015
There is increasing evidence that protein complexation by honey polyphenols is changing honey structure and function. This relatively less investigated filed of honey research is presented in a context of known mechanism of formation of the stable ...
Brudzynski Katrina   +1 more
doaj   +1 more source

Counterion Dependent Side‐Chain Relaxation Stiffens a Chemically Doped Thienothiophene Copolymer

open access: yesAdvanced Functional Materials, EarlyView.
Oxidation of a thienothiophene copolymer, p(g3TT‐T2), via different doping strategies and dopant molecules resulted in materials with similar oxidation levels and a high electrical conductivity of ≈100 S cm−1. However, mechanical properties varied significantly, with sub‐glass transition temperatures and elastic moduli spanning from –44°C to –3°C and ...
Mariavittoria Craighero   +12 more
wiley   +1 more source

A new class of phtalimido-quinones sinthesys

open access: yesOrbital: The Electronic Journal of Chemistry, 2012
Four new Michael adducts from the reaction between 1,4-naphthoquinone and 2,3-dibromo-1,4-naphthoquinone with w-amino-N-alkylphthalamide derivatives were presented in this work (Scheme 1).
Jeziane S. Alves   +2 more
doaj   +1 more source

Dopamine, Chlorogenic Acid, and Quinones as Possible Cofactors of Increasing Adventitious Rooting Potential of In Vitro Krymsk 5 Cherry Rootstock Explants

open access: yesAgronomy, 2022
In the present study, the effect of some not commonly used phenolic compounds was evaluated during the in vitro rooting stage of the cherry rootstock ‘Krymsk 5′ (P. fruticosa × P. lannesiana), in the absence or presence of auxin.
Athanasios Tsafouros, Peter A. Roussos
doaj   +1 more source

Support‐Controlled Reaction Pathways via Dynamic Sulfur‐Mediated Interfaces for Selective Urea Electrolysis

open access: yesAdvanced Functional Materials, EarlyView.
Sulfur‐doped graphitized carbon nanofibers act as adaptive catalyst–support platforms, enabling dynamic sulfur‐mediated reconstruction and strong metal–support interactions. This unique behavior enhances catalyst stability and controls reaction pathways, achieving highly selective urea oxidation (∼92% N2) coupled with efficient hydrogen evolution ...
Melanie Guillén‐Soler   +4 more
wiley   +1 more source

Synthesis of Pyran and Pyranone Natural Products

open access: yesMolecules, 2004
An overview of the synthesis of the fungal metabolites (+)-dermolactone, (–)- semixanthomegnin, (+)- and (–)-mellein, (–)-ochratoxin α, (–)-(1R,3S)-thysanone, the enantiopure ventiloquinones L, E and G, and 8-desmethyleleutherin ...
Leonie M. Tewierik   +2 more
doaj   +1 more source

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