Results 91 to 100 of about 12,662 (287)

Contrasting ring-opening propensities in UV-excited α-pyrone and coumarin [PDF]

, 2016
Ring-opening quantum yields following UV-photoexcitation of coumarin and α-pyrone are influenced by the dynamics through, rather than just the geometries of, conical intersections.
Ashfold, Michael N R, Clark, Ian P., Harabuchi, Yu, Ingle, Rebecca A, Maeda, Satoshi, Murdock, Daniel, Orr-Ewing, Andrew J, Sazanovich, Igor V, Taketsugu, Tetsuya   +8 more
core   +2 more sources

The Structure of Carboxyl Methyltransferase Provides Insights Into the Substrate Specificity and Divergent Evolution of Iridoid

Plant Biotechnology Journal, EarlyView.
ABSTRACT Iridoids constitute a prominent class of plant‐specialised metabolites, with carbocyclic iridoids (e.g., geniposide) and secoiridoids (e.g., loganin) diverging early in their biosynthetic pathways. This divergence is marked by substrate‐specific carboxyl methyltransferases—GjGAMT and CrLAMT—that catalyse the decisive methylation step in ...
Li Li, Zhiteng Luo, Zhaoyin He, Jie Tang, Wuke Wei, Ruoting Zhan, Huihao Zhou, Dongming Ma   +7 more
wiley   +1 more source

Addition of lithiated enol ethers to nitrones and subsequent Lewis acid induced cyclizations to enantiopure 3,6-dihydro-2H-pyrans – an approach to carbohydrate mimetics

Beilstein Journal of Organic Chemistry, 2010
A stereodivergent synthesis of enantiopure 3,6-dihydro-2H-pyrans is presented. The addition of lithiated enol ethers to carbohydrate-derived nitrones afforded syn- or anti-configured hydroxylamine derivatives 4a–d that were cyclized under Lewis acidic ...
Fabian Pfrengle, Hans-Ulrich Reissig
doaj   +1 more source

Resilience of floral scent emission after florivory

Plant Biology, EarlyView.
Florivory is thought to affect floral traits, impacting pollination. However, our data suggest a stability in post‐florivory scent emission, which may guarantee the maintenance of pollinator visitation regardless of florivory, indicating a resilience of natural systems with multiple and simultaneous interactions. Created in BioRender. Tunes, P.
P. Tunes, Y. Canaveze, S. R. Machado, S. Dötterl, E. Guimarães   +4 more
wiley   +1 more source

Rh(iii)-catalyzed synthesis of dibenzo[b,d]pyran-6-ones from aryl ketone O-acetyl oximes and quinones via C–H activation and C–C bond cleavage

, 2022
Wei Yang, Haonan Zhang, Yu Liu, Cuiman Tang, Xiaohui Xu, Jiaqi Liu   +5 more
openalex   +2 more sources

Benzothiazole durch C-C-Spaltung von alpha-[(2-Nitrophenyl)thio]ketonen [PDF]

, 1984
Einwirkung von Ammoniak bzw. Natronlauge auf die -[(2-Nitrophenyl)thio]ketone 4, 11a-c und 16 führt unter CC-Spaltung zu den Benzothiazol-N-oxid-Derivaten 8, 12ac und 17; aus dem 3-[(2-Nitrophenyl)thio]-4-piperidon-Derivat 22 entsteht der 2 ...
Babichev, Birkofer, Eiden, Gordon, Hoffmann, Hofmann, House, Kuehne, Linke, Schröder, Takahashi   +10 more
core   +1 more source

Electronic Smoking Devices Among University Students: Usage Patterns and Chemical Composition of Inhaled Substances

Analytical Science Advances, Volume 7, Issue 1, June 2026.
ABSTRACT This study investigated the prevalence of electronic smoking device (ESD) use and its associated behavioural and chemical risks among university students in Bahia, Brazil. A cross‐sectional survey was conducted with 355 students from public and private institutions through an online questionnaire between April and May 2023. Among participants,
Eduard F. Valenzuela, Raffael Silva Santos Almeida, Ivana Ferreira Simões, Aline Gonçalves Miranda, Magno Oliveira Ramos, Roberto Rodrigues Bandeira Tosta Maciel, Fernanda Warken Rosa, Aníbal de Freitas Santos Júnior   +7 more
wiley   +1 more source

Chitosan Based Heterogeneous Catalyses: Chitosan-Grafted-Poly(4-Vinylpyridne) as an Efficient Catalyst for Michael Additions and Alkylpyridazinyl Carbonitrile Oxidation

Molecules, 2013
Chitosan-grafted-poly(4-vinylpyridine) (Cs-PVP) copolymers could be synthesized under heterogeneous conditions in presence of a potassium persulfate and sodium sulfite redox system.
Hamad M. Al-Matar, Khaled D. Khalil
doaj   +1 more source

KCa 3.1-a microglial target ready for drug repurposing? [PDF]

, 2016
Over the past decade, glial cells have attracted attention for harboring unexploited targets for drug discovery. Several glial targets have attracted de novo drug discovery programs, as highlighted in this GLIA Special Issue.
Dale, E, Eder, C, Möller, T, Staal, RGW
core   +1 more source

Pixelated Laser with Tailored Emission Spectrum Photopatterned by Digital Holographic Microscopy

Advanced Optical Materials, Volume 14, Issue 17, 8 May 2026.
Azobenzene‐based surface‐relief gratings inscribed via DHM‐integrated holographic lithography enable programmable pixelated DFB laser architectures. This approach allows independent control of grating parameters across a 2D array, enabling spatially tailored emission spectra.
Sudharsana Bhashyam Pillailokam, Alex Berdin, Arri Priimagi   +2 more
wiley   +1 more source