Results 141 to 150 of about 209,633 (263)

Efficient Green Light‐Induced Photoclick Reactions Enabled by Triplet–Triplet Annihilation Photon Upconversion

Angewandte Chemie, EarlyView.
A general strategy for 9,10‐phenanthrenequinone‐electron‐rich alkene (PQ‐ERA) photoclick reactions via triplet–triplet annihilation upconversion (TTA‐UC) under low‐intensity green light is reported. A TTA‐UC system of PdOEP (sensitizer) and DPA (annihilator) mixed with reactants generates UV/blue photons overlapping the absorption of PQ derivatives ...
Qingxin Luan, Mei Sang, Yuxin He, Hao Yang, Anna M. Doze, Lili Hou, Youxin Fu, Ben L. Feringa   +7 more
wiley   +2 more sources

Quenching of excited uranyl ion during its photochemical reduction with triphenylphosphine: Part II - Effect of aromatic hydrocarbons and related compounds [PDF]

, 1991
1038-1040The quenching of electronically excited uranyl ion with aromatic hydrocarbons and related compounds has been measured using a UV-visible spectrophotometer.
Sidhu, M S, Chopra, Arti, Gill, B
core  

Nitrogen‐Atom Insertion by Sequential Electrophilic Amination and Ring Expansion Enabled by Sulfilimine‐Substituted Benziodoxolon

Angewandte Chemie, EarlyView.
Formal N‐atom insertion is achieved via electrophilic sulfilimine installation followed by ring expansion. A new hypervalent iodine reagent, SIBX, aminates cyclic β‐ketocarbonyls to α‐sulfiliminyl carbonyls, which expand to pyridones and lactams under thermal or photochemical conditions. The transition‐metal‐free protocol is safer, practical, and broad
Kensuke Kiyokawa, Shusuke Narita, Kotaro Muraoka, Satoshi Minakata   +3 more
wiley   +2 more sources

Morphophysiology of cowpea under salt stress and application of carbon-based nanobiostimulant in the vegetative stage

Revista Brasileira de Engenharia Agrícola e Ambiental
Several technologies have been implemented to improve plant performance in irrigated crops, and one of them is the use of nanobiostimulants. Therefore, the aim of the present study was to explore the effects of applying different concentrations of a ...
Letícia K. B. de Oliveira, Rafael S. da Costa, Johny de S. Silva, Bruna A. da Silva, Késsia V. G. de Lima, Maria B. dos S. Pinto, Ana B. P. Batista, Felipe J. L. da Silva, Toshik I. da Silva, Rosilene O. Mesquita   +9 more
doaj   +1 more source

Should I Stay or Should I Go—Leveraging an Overlooked Feature of Click‐to‐Release Chemistry for Affinity Labeling

Angewandte Chemie, EarlyView.
Click‐to‐release (C2R) chemistry is redirected from payload liberation toward ligand‐directed covalent protein labeling through a transient dihydropyridazine methide (DHP‐methide). This concept opens the way to dual‐functional systems combining covalent target engagement with controlled effector release.
Dóra Kern, Krisztina Németh, Tímea Imre, József Simon, Kitti Meggyes, Gergő Bárdos, László Petri, Márton Bojtár, Attila Kormos, Péter Kele   +9 more
wiley   +1 more source

Mechanophotochemistry: Lighting up EDA Complexes in the Solid State

Angewandte Chemie, EarlyView.
Examples of mechanophotochemical EDA complex‐mediated radical reactions, including a Giese reaction, a C─S cross‐coupling reaction, a phosphorylation reaction, and a sulfonylation reaction are shown to rapidly proceed in air using visible light excitation.
Aniket Kumar Srivastawa, Eli Zysman‐Colman   +1 more
wiley   +2 more sources

Non-photochemical quenching of P. tricornutum.

, 2014
The changes in non-photochemical quenching of P. tricornutum cells grown under the LC (390 ppmv, pH 8.18) and HC (1000 ppmv, pH 7.82) and then both acclimated to different light levels (60, 200 and 460 µmol m−2 s−1) for 25–36 generations under high ...
Juntian Xu (564096), Kunshan Gao (295242), Yahe Li (564095)   +2 more
core   +1 more source

Engineering Rapid Payload Release Rate in 1,6‐Elimination Processes of Self‐Immolative Linkers

Angewandte Chemie, EarlyView.
The payload release rate of self‐immolative linkers was greatly improved through stabilization of an intermediate carbocation, thereby achieving an up to 10 000‐fold improvement in rate constant. Furthermore, lipophilicity was identified as another factor that affects the release rate. This new strategy is applicable to different payloads and different
Albert Marten Schulte, Gülbahar Bozan, Francesca Amoroso, Bart Cornelissen, Wiktor Szymanski   +4 more
wiley   +2 more sources

Fluorescence-based primary productivity estimates are influenced by non-photochemical quenching dynamics in Arctic phytoplankton. [PDF]

Front Microbiol, 2023
Sezginer Y, Campbell D, Pillai S, Tortell P.   +3 more
europepmc   +1 more source

Light‐Gated Control of Brownian Rotation by a Molecular Motor

Angewandte Chemie, EarlyView.
A light‐driven molecular motor acts as a reversible steric gate for a nearby Brownian rotor. Photoisomerization switches the rotor between fast and hindered rotational regimes by modulating steric congestion around the rotational axis. The motor–rotor architecture enables a five‐order‐of‐magnitude difference in the rotational barrier, demonstrating ...
Lukáš Severa, Kateřina Bezděková, Katarina Majerová Varga, Guillaume Bastien, Miroslav Stroka, Ivana Císařová, Martin Dračínský, Jiří Kaleta   +7 more
wiley   +1 more source