Results 21 to 30 of about 112,901 (197)

1,4- Addition of diazomethane to a heterodiene: a direct preparation of the oxazolic ring

Anais da Academia Brasileira de Ciências, 2007
The reaction of naphthoquinone-oximes (3) and (4) with diazomethane yields directly, in one step, the oxazoles (5) and (6), respectively.A reação das naphthoquinona-oximas (3) e (4) com diazometano fornece diretamente, em uma etapa, os oxazóis (5) e (6),
Flávio da S. Emery, Raphael S.F. Silva, Kelly C.G. de Moura, Maria C.F.R. Pinto, Mauro B. Amorim, Valéria R.S. Malta, Regina H.A. Santos, Kátia M. Honório, Albérico B.F. da Silva, Antonio V. Pinto   +9 more
doaj   +1 more source

Mini Review of Phytochemicals and Plant Taxa with Activity as Microbial Biofilm and Quorum Sensing Inhibitors

Molecules, 2015
Microbial biofilms readily form on many surfaces in nature including plant surfaces. In order to coordinate the formation of these biofilms, microorganisms use a cell-to-cell communication system called quorum sensing (QS).
Chieu Anh Kim Ta, John Thor Arnason
doaj   +1 more source

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

FEBS 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

Simulation of electrochemical properties of naturally occurring quinones

Scientific Reports, 2020
Quinones are produced in organisms and are utilized as electron transfer agents, pigments and in defence mechanisms. Furthermore, naturally occurring quinones can also be cytotoxins with antibacterial properties.
Sebastian Birkedal Kristensen, T. van Mourik, T. B. Pedersen, J. L. Sørensen, J. Muff   +4 more
semanticscholar   +1 more source

Synthetic Derivatives against Wild-Type and Non-Wild-Type Sporothrix brasiliensis: In Vitro and In Silico Analyses

Pharmaceuticals, 2022
Recently, the well-known geographically wide distribution of sporotrichosis in Brazil, combined with the difficulties of effective domestic feline treatment, has emphasized the pressing need for new therapeutic alternatives.
Lais Cavalcanti dos Santos Velasco de Souza, Lucas Martins Alcântara, Pãmella Antunes de Macêdo-Sales, Nathália Faria Reis, Débora Sena de Oliveira, Ricardo Luiz Dantas Machado, Reinaldo Barros Geraldo, André Luis Souza dos Santos, Vítor Francisco Ferreira, Daniel Tadeu Gomes Gonzaga, Fernando de Carvalho da Silva, Helena Carla Castro, Andréa Regina de Souza Baptista   +12 more
doaj   +1 more source

Alkylamino and aralkylamino derivatives of avarone and its mimetic as selective agents against non-small cell lung cancer cells, their antibacterial and antifungal potential [PDF]

Journal of the Serbian Chemical Society, 2018
In this paper, the synthesis of fourteen alkylamino and arylamino derivatives of sesquiterpene quinone avarone and its model compound tert-butylquinone is described.
Jeremić Marko, Dinić Jelena, Pešić Milica, Stepanović Marija, Novaković Irena, Šegan Dejan, Sladić Dušan   +6 more
doaj   +1 more source

Mechanistic Insights into Electronic Current Flow through Quinone Devices

Nanomaterials, 2023
Molecular switches based on functionalized graphene nanoribbons (GNRs) are of great interest in the development of nanoelectronics. In experiment, it was found that a significant difference in the conductance of an anthraquinone derivative can be ...
Lawrence Conrad, Isaac Alcón, Jean Christophe Tremblay, Beate Paulus   +3 more
doaj   +1 more source

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

Nanomaterials, 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, Sebastian Stock, Werner Schlemmer, Mathias Hobisch, Nikolaos Kostoglou, Qamar Abbas, Oskar Paris, Christian Mitterer, Michael Hummel, Stefan Spirk   +9 more
doaj   +1 more source

Formation and Biological Targets of Quinones: Cytotoxic versus Cytoprotective Effects

Chemical Research in Toxicology, 2016
Quinones represent a class of toxicological intermediates, which can create a variety of hazardous effects in vivo including, acute cytotoxicity, immunotoxicity, and carcinogenesis. In contrast, quinones can induce cytoprotection through the induction of
J. Bolton, Tareisha L. Dunlap
semanticscholar   +1 more source

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

Molecules, 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, Renato L. de Carvalho, Hugo G. S. Sampaio, João Honorato, Javier A. Ellena, Felipe T. Martins, João V. M. Pereira, Pedro M. S. Costa, Claudia Pessoa, Rafaela S. Ferreira, Maria H. Araújo, Claus Jacob, Eufrânio N. da Silva Júnior   +12 more
doaj   +1 more source