Results 111 to 120 of about 3,742 (239)

Contribution of NMR spectroscopy to the mechanistic understanding of photochromism

International Journal of Photoenergy, 2004
Along with classical UV-Visible spectroscopy allowing for the determination of intrinsic properties (λmax,ε), multinuclear NMR spectroscopy is a promising and useful tool for studying photochromic reactions.
S. Delbaere, J. C. Micheau, J. Berthet, G. Vermeersch   +3 more
doaj   +1 more source

Metabolomics Analysis Revealed That SXZ Ameliorates Cognitive Impairment in Naturally Aged Rats by Promoting Glutathione Metabolism and Inhibiting the Ferroptosis Pathway

CNS Neuroscience &Therapeutics, Volume 32, Issue 10, October 2026.
In aged rats, 6‐month SXZ treatment reversed spatial memory deficits and preserved hippocampal integrity. Mechanistic assays show that SXZ promotes glutathione metabolism and inhibits ferroptosis via p53/SLC7A11/GPX4 and Keap1/Nrf2/HO‐1 pathways. SXZ is a novel neuroprotective agent against age‐related cognitive decline.
Mengya Liu, Shunyi Li, Yonglin Liang, Yugui Zhang, Xutong Jia, Yongqiang Duan, Min Bai   +6 more
wiley   +1 more source

Ultrafast Vibrational Dynamics of 4‐(Dicyano‐methylen)‐2‐methyl‐6‐(4‐dimethylaminostyryl)‐4H‐pyran Upon 1‐ and 2‐Photon Excitation

ChemPhotoChem, Volume 10, Issue 10, October 2026.
We investigated the vibrational dynamics of 4‐(dicyano‐methylen)‐2‐methyl‐6‐(4‐dimethylaminostyryl)‐4H‐pyran (DCM) upon one‐photon excitation (1PE) at 515 nm and upon two‐photon excitation (2PE) at 1030 nm in the spectral range of the nitrile vibrations. Vibrational dynamics of the two nitrile vibrations are traced in real‐time up to 7 ns.
Mathias Hartmann, Xiao‐Hui Li, Probal Nag, Luis Perez Lustres, Igor Schapiro, Sebastian Megow, Karsten Heyne   +6 more
wiley   +1 more source

Hydroxyl-Directed Ruthenium-Catalyzed C-H Bond Functionalization: Versatile Access to Fluorescent Pyrans

, 2012
Hydroxyl-assisted oxidative annulations of alkynes were accomplished with an inexpensive ruthenium(II) complex, delivering fluorescent pyrans via highly site selective as well as chemo- and regioselective C-H/O-H bond functionalizations.Alexander von ...
Ackermann, Lutz, Thirunavukkarasu, Vedhagiri S., Donati, Margherita   +2 more
core   +1 more source

Antimicrobial and Antibiofilm Activity of an Endophytic Fungus, Daldinia sp. Isolated From Avicennia officinalis

MicrobiologyOpen, Volume 15, Issue 5, October 2026.
An endophytic fungus (Daldinia sp.) was isolated from the leaves of Avicennia officinalis collected from mangrove forests of Goa. The ethyl acetate extract of Avicennia officinalis (AO‐EA) of the identified endophyte demonstrated antibacterial and antibiofilm activity against Escherichia coli and Shigella sp.
Nickita Dutta, Nutan Kumari, Anushka Lather, Kundan Kumar   +3 more
wiley   +1 more source

A Review on Cyanidin‐3‐O‐glucoside Antioxidant Activity, Food Technology Applications and Therapeutic Uses

Journal of Food Science, Volume 91, Issue 10, October 2026.
ABSTRACT Anthocyanins are plant derived biomolecules that play roles in pollination and protection against ultraviolet light (UV) radiation, as well as reactive oxygen and nitrogen species (ROS and RNS, respectively). Cyanidin 3‐O‐glucoside (C3G), a common anthocyanin in the diet, exhibits antioxidant capacity that depends on its chemical structure ...
Eiko Osawa‐Martínez, Yury Rodríguez‐Yáñez, Benito Minjarez, Salvador Mena‐Munguía, Irais Poblete‐Naredo, Adolfo Sierra‐Santoyo, Arnulfo Albores   +6 more
wiley   +1 more source

A modular UDP‐glycosyltransferase and cytochrome P450 system for soyasaponin C‐22 modification

The Plant Journal, Volume 128, Issue 1, October 2026.
SUMMARY Soybean (Glycine max (L.) Merr.) produces triterpenoid saponins, called soyasaponins, which are categorised as 2,3‐dihydro‐2,5‐dihydroxy‐6‐methyl‐4H‐pyran‐4‐one (DDMP) saponins and group A saponins based on the chemical modifications at the C‐22 position of their triterpene skeleton.
Susumu Hiraga, Yukiko Fujisawa, Panneerselvam Krishnamurthy, Hae‐Reon Son, Soo Yeon Chung, Hayato Suzuki, Ryu Nakata, Yoshikazu Shimoda, Ryoichi Yano, Akito Kaga, Chigen Tsukamoto, Hikaru Seki, Toshiya Muranaka, Masao Ishimoto   +13 more
wiley   +1 more source

Peer review of the pesticide risk assessment of the active substance Trichoderma afroharzianum (formerly harzianum) T‐22

EFSA Journal, Volume 24, Issue 10, October 2026.
Abstract The conclusions of the European Food Safety Authority (EFSA) following the peer review of the initial risk assessments carried out by the competent authorities of the rapporteur Member State, Sweden, and co‐rapporteur Member State, Netherlands, for the pesticide active substance Trichoderma afroharzianum (formerly harzianum) T‐22 are reported.
European Food Safety Authority (EFSA), Fernando Álvarez, Maria Arena, Domenica Auteri, Sofia Batista Leite, Marco Binaglia, Anna Federica Castoldi, Arianna Chiusolo, Angelo Colagiorgi, Mathilde Colas, Federica Crivellente, Chloe De Lentdecker, Isabella De Magistris, Gabriella Fait, Franco Ferilli, German Giner Santonja, Varvara Gouliarmou, Alessio Ippolito, Frederique Istace, Dimitra Kardassi, Aude Kienzler, Anna Lanzoni, Roberto Lava, Renata Leuschner, Alberto Linguadoca, Mariano Lopez Romano, Jochem Louisse, Christopher Lythgo, Oriol Magrans, Iris Mangas, Silvia Mazzega, Andrea Mioč, Ileana Miron, Tunde Molnar, Laura Padovani, Vincenzo Padricello, Martina Panzarea, Juan Manuel Parra Morte, Simone Rizzuto, Miguel Santos, Rositsa Serafimova, Rachel Sharp, Csaba Szentes, Anne Theobald, Manuela Tiramani, Giorgia Vianello, Laura Villamar‐Bouza, Adriana Scattareggia Marchese   +47 more
wiley   +1 more source

Elastic and electronically inelastic scattering of electrons by 2H-pyran and 4H-pyran molecules

Journal of Applied Physics
We report on elastic and electronically inelastic integral and differential cross sections for electron collisions with the 2H-pyran and 4H-pyran molecules. The scattering calculations were performed with the Schwinger multichannel method and aimed to (i) investigate the formation of resonant states, (ii) assign and compare the resonance spectrum of ...
Murilo O. Silva, Giseli M. Moreira, Márcio H. F. Bettega, Romarly F. da Costa   +3 more
openaire   +1 more source

Asymmetric Synthesis of Tertiary α‐Aryl Stereocentres in Tetrahydro‐4H‐pyran‐4‐ones Using Pd‐Catalyzed Decarboxylative Asymmetric Protonation

European Journal of Organic Chemistry, Volume 29, Issue 36, 24 September 2026.
The Pd‐catalyzed decarboxylative asymmetric protonation (DAP) has been developed for sterically hindered tetrahydro‐4H‐pyran‐4‐one derived α‐aryl‐β‐keto esters. A substrate scope of nine examples of DAP showed that substrates containing a di‐ortho methoxy substitution pattern on the aryl ring gave rise to the highest enantioselectivities of up to 85 ...
Fionn McNeill, Joffrey Scriven, Fritz Bahns, Anugam V. Krishna, Julia Bruno‐Colmenarez, Patrick J. Guiry   +5 more
wiley   +1 more source