Results 61 to 70 of about 105,414 (302)

An Edible H2O2 Biosensor for Gastrointestinal Metabolites and Peroxidase Enzyme Quantification

Advanced Healthcare Materials, EarlyView.
We present an edible biosensor for gastric fluid analysis that integrates a caffeic acid–horseradish peroxidase redox system into an edible electrolyte‐gated transistor. The device enables rapid, low‐volume detection of H2O2 and, with minimal modification, metabolites and enzyme activity in simulated gastrointestinal conditions.
Valerio Francesco Annese, Elena Feltri, Pietro Rossi, Valerio Galli, Cristiano Bortolotti, João Paulo Vita Damasceno, Ivan K. Ilic, Dario Natali, Alessandro Luzio, Adrica Kyndiah, Mario Caironi   +10 more
wiley   +1 more source

Investigation into the role of carboxylic acid and phenolic hydroxyl groups in the plant biostimulant activity of a humic acid purified from an oxidized sub-bituminous coal

Frontiers in Plant Science
IntroductionHumic substances (HS) are increasingly being applied as crop plant biostimulants because they have been shown to increase plant productivity, especially under environmentally stressful conditions.
Richard T. Lamar, Jason Gralian, William C. Hockaday, Maria Jerzykiewicz, Hiarhi Monda   +4 more
doaj   +1 more source

Nanostructures Formed by Custom-Made Peptides Based on Amyloid Peptide Sequences and Their Inhibition by 2-Hydroxynaphthoquinone

Frontiers in Chemistry, 2020
Extensive research on amyloid fibril formations shows that certain core sequences within Aβ peptide play an important role in their formation. It is impossible to track these events in vivo.
Radhika Mannem, Mohammed Yousuf, Lakshmaiah Sreerama   +2 more
doaj   +1 more source

Quinone Reductase 2 Is a Catechol Quinone Reductase [PDF]

Journal of Biological Chemistry, 2008
The functions of quinone reductase 2 have eluded researchers for decades even though a genetic polymorphism is associated with various neurological disorders. Employing enzymatic studies using adrenochrome as a substrate, we show that quinone reductase 2 is specific for the reduction of adrenochrome, whereas quinone reductase 1 shows no activity.
Yue, Fu, Leonid, Buryanovskyy, Zhongtao, Zhang   +2 more
openaire   +2 more sources

Macrophage Membrane‐Cloaked, ROS‐Triggered Quercetin Nanocarriers Target Ovarian Lesions to Treat Polycystic Ovary Syndrome

Advanced Healthcare Materials, EarlyView.
The synthesis process of MM@PCD@QNPs and its potential mechanism for treating PCOS. (A) Assembly steps of MM@PCD@QNPs. (B) Synthesis and decomposition of MM@PCD@QNPs. (C) Potential therapeutic mechanisms of MM@PCD@QNPs for PCOS. PCD, PABP conjugated with DEX polymer; QUR, quercetin; CDI, N, N′‐carbonyldiimidazole; DEX, dextran; PABP, 4‐(hydroxymethyl ...
Wenzhu Li, Yu Guan, Nan Song, Feng Zhang, Zhimin Deng, Tailang Yin, Yanbing Yang, João Conde, Wenyi Jin, Zhinang Yin   +9 more
wiley   +1 more source

Research Progress on Chemical Compositions, Pharmacological Activities, and Toxicities of Quinone Compounds in Traditional Chinese Medicines

Toxics
With the continuous development of research on natural medicines, quinone compounds have become increasingly important in the research field of chemical constituents of natural treatments.
Zhe Li, Rui Yao, Hong Guo, Wenguang Jing, Xiaohan Guo, Xiaoqiu Liu, Yingni Pan, Pei Cao, Lei Zhang, Jianbo Yang, Xianlong Cheng, Feng Wei   +11 more
doaj   +1 more source

Anticancer Effect and Structure-Activity Analysis of Marine Products Isolated from Metabolites of Mangrove Fungi in the South China Sea

Marine Drugs, 2010
Marine-derived fungi provide plenty of structurally unique and biologically active secondary metabolites. We screened 87 marine products from mangrove fungi in the South China Sea for anticancer activity by MTT assay.
Li-yang Tao, Jian-ye Zhang, Yong-ju Liang, Li-ming Chen, Li-sheng Zheng, Fang Wang, Yan-jun Mi, Zhi-gang She, Kenneth Kin Wah To, Yong-cheng Lin, Li-wu Fu   +10 more
doaj   +1 more source

Features of idebenone and related short-chain quinones that rescue ATP levels under conditions of impaired mitochondrial complex I. [PDF]

PLoS ONE, 2012
Short-chain quinones have been investigated as therapeutic molecules due to their ability to modulate cellular redox reactions, mitochondrial electron transfer and oxidative stress, which are pathologically altered in many mitochondrial and neuromuscular
Michael Erb, Barbara Hoffmann-Enger, Holger Deppe, Michael Soeberdt, Roman H Haefeli, Christian Rummey, Achim Feurer, Nuri Gueven   +7 more
doaj   +1 more source

Physiological Evidence for Isopotential Tunneling in the Electron Transport Chain of Methane-Producing Archaea [PDF]

, 2017
Many, but not all, organisms use quinones to conserve energy in their electron transport chains. Fermentative bacteria and methane-producing archaea (methanogens) do not produce quinones but have devised other ways to generate ATP. Methanophenazine (MPh)
Buan, Nicole R., Duszenko, Nikolas
core   +1 more source

Synthesis and Spectroscopic Characterization of High-Spin Mononuclear Iron(II) \u3cem\u3ep\u3c/em\u3e-Semiquinonate Complexes [PDF]

, 2014
Two mononuclear iron(II) p-semiquinonate (pSQ) complexes have been generated via one-electron reduction of precursor complexes containing a substituted 1,4-naphthoquinone ligand. Detailed spectroscopic and computational analysis confirmed the presence of
Baum, Amanda E., Fiedler, Adam T., Lindeman, Sergey V., Park, Heaweon   +3 more
core   +3 more sources