Results 31 to 40 of about 4,751 (182)

Fluorescence of Naphthoquinones [PDF]

Nature, 1954
ATTEMPTS to devise a method for the identification of vitamin K1 and other naphthoquinones by filter-paper chromatography led to the chance observation that some of these compounds exhibit a characteristic fluorescence which can be used for their detection. 10 µgm.
openaire   +1 more source

Diels-Alder Cycloaddition of Cyclopentadiene to a Bis-naphthoquinone

Molecules, 2000
Addition of cyclopentadiene to bis-naphthoquinone (1) afforded predominantly the endo-endo [4+2] cycloadduct (2).
Letecia J. Duncalf, Margaret A. Brimble
doaj   +1 more source

Electrochemical Studies and the Electrode Reaction Mechanism of Ferrocene and Naphthoquinones in Microemulsion Medium at GC Electrode

International Journal of Electrochemical Science, 2020
The electrochemical behavior of 1,4-napthoquinone (1,4-NAQ) and 2-methyl-1,4-naphthoquinone (2-Me-1,4-NAQ) was investigated in bis-(2-ethylhexyl) sulfosuccinate (EHSS) anionic surfactant and its microemulsion system as well as in aqueous medium using ...
M. Abdallah, Ahmed Alharbi, Moataz Morad, Ahmed M. Hameed, Salih S. Al-Juaid, N. Foad, E.M. Mabrouk   +6 more
doaj   +1 more source

ANTIOXIDANT NAPHTHOQUINONES OF Sinningia reitzii FROM SANTA CATARINA STATE, BRAZIL

Química Nova, 2021
Sinningia reitzii (Hoehne) L. E. Skog (Gesneriaceae) is a subshrub native to Brazil, where it is distributed in two disjunctive populations around the 26°S and 23°S parallels.
Vanessa Winiewski, Adson S. Silva, Kattleen D. C. Alvarez, Eduardo L. de Sá, Marcos J. Salvador, Maria Élida A. Stefanello   +5 more
doaj   +1 more source

Suppressing VEGF-A/VEGFR-2 Signaling Contributes to the Anti-Angiogenic Effects of PPE8, a Novel Naphthoquinone-Based Compound

Cells, 2022
Natural naphthoquinones and their derivatives exhibit a broad spectrum of pharmacological activities and have thus attracted much attention in modern drug discovery.
Ming-Jen Hsu, Han-Kun Chen, Jin-Cherng Lien, Yu-Han Huang, Shiu-Wen Huang   +4 more
doaj   +1 more source

POLYPHENOLS AND NAPHTHOQUINONES EXTRACTION FROM WALNUTS PELLICULA: THE IMPACT ON KERNELS QUALITY [PDF]

Journal of Engineering Science (Chişinău), 2020
Walnuts change their appearance during storage, becoming brown and bitter. The aim of this paper was to determine the polyphenols and naphthoquinones extraction process parameters from the pellicle of kernels, and to assess the influence of extraction on
Baerle, Alexei, Tatarov, Pavel, Sandu, Iuliana   +2 more
doaj   +1 more source

Iron(III)‐loaded cation exchange resin: A dual approach for aqueous H2S removal and biogas desulphurization

The Canadian Journal of Chemical Engineering, EarlyView.
Left: Desulphurization method application. Right: Novel desulphurization method. Abstract The presence of hydrogen sulphide (H2S) in biogas poses significant environmental and operational challenges due to its corrosive and toxic properties. Thus, this study aimed to develop a dual‐function desulphurization system using a cation exchange resin (CIER ...
Matheus Damásio Thrun, Renata Mello Giona, Eduardo Eyng, Eduardo Borges Lied, Laércio Mantovani Frare, Ismael Laurindo Costa Junior, Ilton José Baraldi   +6 more
wiley   +1 more source

Evaluation of some organic compounds on bloodstream forms of Trypanosoma cruzi

Memorias do Instituto Oswaldo Cruz, 1992
Accidental transmission of Chagas' disease to man by blood transfusion is a serious problem in Latin-America. This paper describes the testing of several synthetic, semi-synthetic, and natural compounds for their activity against blood trypomastigotes in
João S. Silva, S. Ferrioli-Filho, M. M. Kanesiro, V. F. Ferreira, S. C. Santos, C. N. Pinto, J. L. Fonseca, H. E. Mizrahy, B. Gilbert, M. C. F. R. Pinto, F. W. Ribeiro, A. V. Pinto   +11 more
doaj   +1 more source

Confinement−Adsorption Synergy in Hybrid Carbon‐Coated Separator Enables Stable High‐Rate Quinone Cathode for Magnesium Batteries

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A sulfur‐containing heterocyclic quinone cathode for rechargeable magnesium batteries is coupled with a GO/MWCNTs–COOH separator that establishes a confinement–adsorption regulation mechanism, thereby significantly accelerating Mg2+ reaction kinetics and minimizing active‐material loss.
Xiquan Qi, Xingyu Gao, Zhirong Zhao‐Karger, Xiangyu Zhao   +3 more
wiley   +1 more source

Natural Anthraquinone‐Like Compound Extracted from Green Husk of Walnut Improves Photocatalytic H2O2 Production Catalyzed by TiO2 Nanoparticles

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
In this work, a novel biomolecule/semiconductor hybrid catalyst was prepared by loading anthraquinone‐liked juglone onto anatase TiO2. This catalyst exhibited high photocatalytic activity for H2O2 production. Hydrogen peroxide (H2O2) is a vital oxidant with broad industrial applications, and its production via photocatalysis represents a highly ...
Zengyin He, Cui Li, Mingze Ni, Shu Lin, Kezhen Qi   +4 more
wiley   +1 more source