Results 21 to 30 of about 16,959 (230)

Structure of 2,9-dimethyl-1,10-phenanthroline hemihydrate [PDF]

open access: yes, 1991
C14H12N2•½H2O, Mr = 217•27, tetragonal I41/a, a = 14•258 (3), c = 22•286 (4) Å, V = 4531 (3) Å3, Z = 16, Dx = 1•274 (1) g cm-3, Mo Kα radiation λ = 0•71073 Å, µ = 0•74 cm-1, F(000) = 1840, T = 297 K, R = 0•041 for 1196 unique observed reflections with I \
Britton, Doyle   +2 more
core   +2 more sources

Litter Quality of Populus Species as Affected by Free-Air CO2 [PDF]

open access: yes, 2009
The effect of elevated CO2 and nitrogen fertilization on the molecular chemistry of litter of three Populus species and associated soil organic matter (SOM) was investigated by pyrolysis-gas chromatography/mass spectrometry.
Buurman, P., Hoosbeek, M.R., Vermue, E.
core   +4 more sources

Identification and Characterization of an Anti-Fibrotic Benzopyran Compound Isolated from Mangrove-Derived Streptomyces xiamenensis

open access: yesMarine Drugs, 2012
An anti-fibrotic compound produced by Streptomyces xiamenensis, found in mangrove sediments, was investigated for possible therapeutic effects against fibrosis.
Jun Xu   +10 more
doaj   +1 more source

Epicatechin induces NF-kappa B, activator rotein-1 (AP-1) and nuclear transcription factor erythroid 2p45-related factor-2 (Nrf2) via phosphatidylinositol-3-kinase/protein kinase B (PI3K/AKT) and extracellular regulated kinase (ERK) signalling in HepG2 cells [PDF]

open access: yes, 2009
The dietary flavonoid epicatechin has been reported to exhibit a wide range of biological activities. The objective of the present study was to investigate the time-dependent regulation by epicatechin on the activity of the main transcription factors (NF-
Bravo, Laura   +5 more
core   +4 more sources

Isoquinoline Alkaloids and Homoisoflavonoids from Bak and Bak

open access: yesNatural Product Communications, 2008
The powdered bulbs and leaves of Drimiopsis barteri yielded two novel isoquinoline alkaloids: 5-hydroxy-7,2′,3′,4′-tetramethoxy{2H-1-}benzopyran [4,3-c]isoquinoline and 6-hydroxy-7,2′,3′,4′-tetramethoxy{2H-1-}benzopyran [4,3-c]isoquinoline, three new ...
Dieudonne Ngamga   +7 more
doaj   +1 more source

The effect of chalcogen substitution on the structure and spectroscopy of 4,7-dimethyl-2: H -chromen-2-one/thione analogues [PDF]

open access: yes, 2017
4,7-Dimethyl-2H-chromen-2-one (1) and its novel sulfur analogue 4,7-dimethyl-2H-chromen-2-thione (2) were synthesized and fully characterized by spectroscopic methods and mass spectrometry. The crystal structure of compound 2 has been determined by X-ray
Delgado Espinosa, Zuly Yuliana   +5 more
core   +2 more sources

Metal-mediated intramolecular hydroamination and hydro(acy)alkoxylation reactions [PDF]

open access: yes, 2012
This PhD thesis describes work undertaken to effect asymmetric catalysis in hydroamination and hydro(acy)alkoxylation reactions of allenes. The introductory Chapter provides an overview of recent advances in asymmetric heterofunctionalisation reactions ...
Arbour, Jannine Louise   +1 more
core   +1 more source

In Vivo Metabolism Study of Xiamenmycin A in Mouse Plasma by UPLC-QTOF-MS and LC-MS/MS

open access: yesMarine Drugs, 2015
Xiamenmycin A is an antifibrotic leading compound with a benzopyran skeleton that is isolated from mangrove-derived Streptomyces xiamenensis.
Feng Lei   +4 more
doaj   +1 more source

Schizophrenic molecules and materials with multiple personalities - how materials science could revolutionise how we do chemical sensing [PDF]

open access: yes, 2009
Molecular photoswitches like spiropyrans derivatives offer exciting possibilities for the development of analytical platforms incorporating photo-responsive materials for functions such as light-activated guest uptake and release and optical reporting on
Benito-Lopez, Fernando   +4 more
core   +1 more source

Synthesis of 4-Triazolylamino- and 4-Benzothiazolylamino-3-nitro-2H-[1]-Benzopyran-2-ones and their Antimicrobial Activity

open access: yesOrbital: The Electronic Journal of Chemistry, 2014
Novel substituted benzopyran-2-one derivatives were synthesized by catalytic condensation reactions under reflux conditions. 4-(1,2,4-Triazolyl-3-amino)-3-nitro-2H-[1]-benzopyran-2-ones 4(a-b) were synthesized by condensation of 4-chloro-3-nitro-2H-[1 ...
Ramiz Hoti   +6 more
doaj   +1 more source

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