Results 61 to 70 of about 44,980 (368)
Analysis of Conformational Preferences in Caffeine
Molecules, 2022 High level DLPNO–CCSD(T) electronic structure calculations with extended basis sets over B3LYP–D3 optimized geometries indicate that the three methyl groups in caffeine overcome steric hindrance to adopt uncommon conformations, each one placing a C–H ...
Sara Gómez +2 more
doaj +1 more source
Temperature and Tautomeric Effects in High-Resolution Oxygen 1s X-ray Photoelectron Spectroscopy of Purines and Pyrimidines [PDF]
J. Chem. Phys. 161, 104303 (2024)Purines and pyrimidines, crucial building blocks in biological systems, have attracted significant interest across molecular physics, biochemistry, pharmacology, and chemistry. Extensive spectroscopies have been employed for characterization, while the temperature and potential tautomeric effects can complicate the interpretation of underlying physics ...
arxiv +1 more source
Methylxanthines enhance the effects of cocoa flavanols on cardiovascular function: randomized, double-masked controlled studies [PDF]
, 2016 Background: Cocoa flavanol intake, especially that of (−)-epicatechin, has been linked to beneficial effects on human cardiovascular function. However, cocoa also contains the methylxanthines theobromine and caffeine, which may also affect vascular ...
Crozier, Alan +10 more
core +2 more sources
Advanced Sensor Research, EarlyView.A one‐step electrochemical strategy is utilized to develop a flexible, enzyme‐free biosensor for the sensitive detection of uric acid (UA). The hierarchical cobalt nanostructures synergistically enhance the performance of the biosensor, resulting in a broad detection range of 5 to 700 µM with a sensitivity of 6.75 µA µM−1 cm−2 and a low detection limit
Anju Joshi, Gymama Slaughter
wiley +1 more source
Mechanisms involved in anti-aging effects of guarana (Paullinia cupana) in Caenorhabditis elegans
Brazilian Journal of Medical and Biological Research, 2018 Guarana (Paullinia cupana) is habitually ingested by people in the Amazon region and is a key ingredient in various energy drinks consumed worldwide.
L.P. Arantes +8 more
doaj +1 more source
Advanced Science, EarlyView.The research findings indicate that dimethyl itaconate (DI) alleviates Escherichia coli (E. coli) induced endometritis by modulating the gut microbiota and enriching the abundance of norank_f_Muribaculaceae, thereby increasing the production of guanosine.
Yuhang He +6 more
wiley +1 more source
Cafeína: revisão sobre métodos de análise Analytical methods for caffeine
Química Nova, 2007 Gravimetric and Bailey-Andrew methods are tedious and provide inflated results. Spectrofotometry is adequate for caffeine analysis but is lengthy. Gas chromatography also is applied to the caffeine analysis but derivatization is needed.
Carlos A. B. De Maria +1 more
doaj +1 more source
Psychoactive substance consumption by Portuguese population [PDF]
, 2019 BACKGROUND: Increasing consumption of psychoactive substances is a major social concern worldwide. OBJECTIVES: To investigate the prevalence of psychoactive substances consumption in the Portuguese population, lifetime and recently, the main reasons for
Costa, Ricardo +4 more
core
Advanced Science, EarlyView.This study has identified lncRNA‐MEG3 as a key regulator of muscle mass, promoting slow‐twitch muscle fibers and preventing muscle atrophy. By stabilizing the SUZ12/PRC2 complex through liquid–liquid phase separation (LLPS), lncRNA‐MEG3 influences mitochondrial function and lipid metabolism.
Yilong Yao +15 more
wiley +1 more source
Towards Prebiotic Chemistry on Titan: Impact experiments on organic haze particles [PDF]
2024 Planet. Sci. J. 5 68Impacts are critical to producing the aqueous environments necessary to stimulate prebiotic chemistry on Titan's surface. Furthermore, organic hazes resting on the surface are a likely feedstock of biomolecules. In this work, we conduct impact experiments on laboratory-produced organic haze particles and haze/sand mixtures and analyze these samples for
arxiv +1 more source