Results 31 to 40 of about 10,662 (299)

Cytotoxicity of the Defensive Secretion from the Medicinal Insect Blaps rynchopetera

open access: yesMolecules, 2017
Blaps rynchopetera Fairmaire has long been used as a folk medicine by the Yi and Bai ethnic groups in China to treat fever, cough, gastritis, boils, and tumors. In the present study, the cytotoxicity of the defensive secretion (TDS) of B.
Huai Xiao   +9 more
doaj   +1 more source

The MarR-Type Repressor MhqR Confers Quinone and Antimicrobial Resistance in Staphylococcus aureus [PDF]

open access: yes, 2019
Aims: Quinone compounds are electron carriers and have antimicrobial and toxic properties due to their mode of actions as electrophiles and oxidants.
Fritsch, Verena Nadin   +9 more
core   +1 more source

Regioselective bromination of 1,4-dimethoxy-2,3-dimethylbenzene and conversion into sulfur-functionalised benzoquinones [PDF]

open access: yes, 2016
The NBS bromination of 1,4-dimethoxy-2,3-dimethylbenzene has been examined under a variety of conditions in both 1,1,1-trichloroethane and benzotrifluoride. Four different bromination products have been isolated including the previously unknown 1-bromo-4-
Aitken, Robert Alan   +3 more
core   +1 more source

Synthesis and Biological Evaluation of 2,5-Bis(alkylamino)-1,4-benzoquinones

open access: yesMolecules, 2010
A series of twelve 2,5-bis(alkylamino)-1,4-benzoquinones were prepared in yields ranging from 9–58% via the reaction between p-benzoquinone and various amines.
Cláudia Pessoa   +8 more
doaj   +1 more source

Synthesis of Illisimonin a Skeleton by Intramolecular Diels–Alder Reaction of Ortho-Benzoquinones and Biomimetic Skeletal Rearrangement of Allo-Cedranes

open access: yesOrganics, 2021
Illisimonin A is a new sesquiterpene isolated from Illicium simonsii, and it possesses a novel 5/5/5/5/5 pentacyclic skeleton. The tricyclic skeleton of illisimonin A, tricyclo[5.2.1.01,5]decane, is presumed to be biosynthesized from allo-cedranes via a ...
Takahiro Suzuki   +5 more
doaj   +1 more source

Painful violaceous pigmentation, a clinical challenge and diagnostic approach in a tropical country

open access: yesActa Médica Peruana, 2022
Millipedes are not considered poisonous animals, although in some cases their chemical defense mechanisms may be deleterious for human beings, manifesting as erythematous, purpuric and/ or cyanotic lesions alongside local pain and paresthesia. According
Oscar Fabián Rojas-Gómez   +5 more
doaj   +1 more source

Hydroxylated derivatives of dimethoxy-1,4-benzoquinone as redox switchable earth-alkaline metal ligands and radical scavengers [PDF]

open access: yes, 2013
Benzoquinones (BQ) have important functions in many biological processes. In alkaline environments, BQs can be hydroxylated at quinoid ring proton positions.
Bogeski, Ivan   +10 more
core   +1 more source

Prevention of Undesirable Isomerization during Olefin Metathesis [PDF]

open access: yes, 2005
1,4-Benzoquinones have been found to prevent olefin isomerization of a number of allylic ethers and long-chain aliphatic alkenes during ruthenium-catalyzed olefin metathesis reactions. Electron-deficient benzoquinones are the most effective additives for
Grubbs, Robert H.   +3 more
core   +1 more source

Near‐Infrared Emitting Lanthanide Catecholate Giant Single Crystals – Morphology Control and Photon Down‐Conversion

open access: yesAdvanced Functional Materials, EarlyView.
Controlled syntheses of lanthanide coordination polymers based on the dihydroxybenzoquinone (DHBQ) organic linker afforded large single crystals of Ln‐DHBQ CPs (Ln = Yb, Nd). A novel structural variant of Yb‐DHBQ is identified by means of single crystal diffraction analysis.
Marina I. Schönherr   +7 more
wiley   +1 more source

Polymeric foams as the matrix of voltammetric sensors for the detection of catechol, hydroquinone, and their mixtures [PDF]

open access: yes, 2018
Producción CientíficaPorous electrodes based on polymethylmethacrylate and graphite foams (PMMA_G_F) have been developed and characterized. Such devices have been successfully used as voltammetric sensors to analyze catechol, hydroquinone, and their ...
Fernández Blanco, C.   +4 more
core   +1 more source

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