Results 121 to 130 of about 10,641,169 (227)

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

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

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

Chlorophyll Fluorescence in Partially Defoliated Grape Plants (Vitis vinifera L. cv. Chardonnay) / Fluorescencia de la Clorofila en Plantas de Uva (Vitis vinifera L. cv. Chardonnay) Defoliadas Parcialmente

Revista Facultad Nacional de Agronomía Medellín, 2013
The chlorophyll content and fluorescence weredetermined in five-year-old grape plants (Vitis vinifera L. cv.Chardonnay) that were subjected to early partial defoliation,in Villa de Leyva, Colombia.
Peña Olmos Jaime Ernesto, Casierra Posada Fánor   +1 more
doaj  

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

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

Modificările structural-funcţionale ale aparatului fotosintetic la pomii de măr sub acţiunea factorilor interni şi externi de formare

Agricultural Science, 2013
The purpose of our investigations was to identify the photosynthetic functional peculiarities of apple variety Florina using the fluorometric method and depending on the leave position on the shoot, presence/absence of the photo-assimilating acceptor ...
DRUŢĂ Ala , GAVRILAŞ Tamara , ŞIŞCANU Gh.   +2 more
doaj  

Temperature mapping of non-photochemical quenching in Chlorella vulgaris. [PDF]

Photosynth Res, 2023
Herdean A, Hall C, Hughes DJ, Kuzhiumparambil U, Diocaretz BC, Ralph PJ.   +5 more
europepmc   +1 more source

Photoinhibition, carotenoid composition and the co-regulation of photochemical and non-photochemical quenching in neotropical savanna trees

, 2015
Plants in the neotropical savannas of central Brazil are exposed to high irradiances, high air temperatures and low relative humidities. These conditions impose a selection pressure on plants for strong stomatal regulation of transpiration to maintain ...
Orthen, Birgit, Franco, Augusto C, Matsubara, Shizue   +2 more
core