Results 51 to 60 of about 9,678 (243)

Räumliche Entwicklung von Koks in ZSM‐5‐Katalysatoren während der Umwandlung von Methanol in Kohlenwasserstoffe, aufgezeigt durch in‐situ‐Röntgen‐Photoelektronenspektroskopie

Angewandte Chemie, EarlyView.
Oberfläche enthüllt: Verkokung ist die zentrale Ursache für die Deaktivierung von Zeolithkatalysatoren. Mithilfe von In‐situ‐XPS in Verbindung mit ergänzenden Methoden identifizieren wir Unterschiede in der Bildungskinetik und Zusammensetzung von Oberflächenkoks auf industriell relevanten ZSM‐5‐Katalysatoren während der MTH‐Umwandlung und zeigen damit ...
Luca Artiglia, Hannes Frey, Loïc Bénariac‐Doumal, Sung Sik Lee, Przemyslaw Rzepka, Jeroen A. van Bokhoven, Vladimir Paunović   +6 more
wiley   +1 more source

Spectroscopic Investigations of Dithienyl Polyenes

, 1999
To understand the properties of light-sensitive compounds used in optical limiters having photoinduced charge transfer mechanisms, we have investigated the photophysics of a series of di(2-thienyl-3,4–butyl)polyenes.
Charles W. Spangler, Lalgudi V. Natarajan, Laura A. Sowards, Thomas M. Cooper, Daniel G. Mclean, Sean Kirkpatrick, Suresh Chandra   +6 more
core   +1 more source

Intramolecular energy transfer through linear polyenes : effect of spacers [PDF]

, 1990
The optical properties of linear polyenes terminally substituted with different molecules (mainly anthryl- and TPP-substituents) have been studied. Bicyclic spacers within the polyene chain affect the quantum yields but do not interrupt intramolecular ...
Blessing, Gerd, Effenberger, Franz, Schlosser, Hubert, Wolf, Hans Christoph, Kesmarszky, Thomas, Holl, Norbert, Port, Helmut   +6 more
core   +1 more source

Profound cell wall remodeling in Candida parapsilosis during systemic infection confers simultaneous tolerance to echinocandins and host immunity

Microbiology Spectrum
Antifungal tolerance can promote the emergence of resistance yet often incurs fitness costs for fungal pathogens. How tolerant populations compensate for these deficits and how they may be therapeutically targeted remain poorly understood.
Farnaz Daneshnia, Liuyang Cai, Deepika Gunasekaran, Isha Gautam, Austin M. Perry, Pegah Mosharaf Ghahfarokhy, Arefeh Ebadati, Julieta Munoz, Dorian Padilla, Süleyha Hilmioglu-Polat, Shenglin Mei, Daniel J. Floyd, Miquel Àngel Schikora-Tamarit, Diego Fuentes, Maria Artigues-Lleixà, Louise A. Walker, Samuel M. Gonçalves, Mostafa Salehi, Agostinho Carvalho, Jigar V. Desai, David S. Perlin, Carol A. Munro, Alex Hopke, Tuo Wang, Toni Gabaldón, Wenjie Fang, Clarissa J. Nobile, Michael K. Mansour, Amir Arastehfar   +28 more
doaj   +1 more source

polyenes

, 1994
Full configuration interaction (FCI) calculations are reported for the closed-shell cyclic polyenes CNHN (N = 6, 10, 14, 18) in the Pariser-Parr-Pople (PPP) approximation, as a function of the hopping parameter.
Laura Gagliardi, Bendazzoli, Gian Luigi, Stefano Evangelisti, Evangelisti, Stefano, Gian Luigi Bendazzoli, Gagliardi, Laura   +5 more
core   +1 more source

Structures and Bonding in Hexacarbonyl Diiron Polyenes: Cycloheptatriene and 1,3,5-Cyclooctatriene

Chemistry, 2022
Structural preferences of (1,3,5-cyclooctatriene) hexacarbonyl diiron [(C8H10)Fe2(CO)6] and cycloheptatriene hexacarbonyl diiron [(C7H8)Fe2(CO)6] were explored using density functional theory (DFT) computations.
Min Zhang, Guangchao Liang
doaj   +1 more source

Spatial Evolution of Coke in ZSM‐5 Catalysts During Methanol‐to‐Hydrocarbons Conversion Revealed by In Situ X‐Ray Photoelectron Spectroscopy

Angewandte Chemie International Edition, EarlyView.
Coking is the central source of deactivation of zeolite catalysts. Using in situ XPS along with complementary methods, we identify differences in the formation kinetics and composition of surface coke on industrially relevant ZSM‐5 catalysts during MTH conversion, demonstrating the strong potential of this technique for studying catalyst deactivation ...
Luca Artiglia, Hannes Frey, Loïc Bénariac‐Doumal, Sung Sik Lee, Przemyslaw Rzepka, Jeroen A. van Bokhoven, Vladimir Paunović   +6 more
wiley   +1 more source

VBDFT(s) - a semi-empirical valence bond method: Application to linear polyenes containing oxygen and nitrogen heteroatoms [PDF]

, 2001
A semi-empirical valence bond (VB) method, VBDFT(s), is applied to the series of linear polyenes with heteroatoms CM -1HMO, CM - 2HM - 2O2, CM - 1HM + 1N, and CM - 2HMN2 (M = 4-26). The computational results show that the VBDFT(s) method, which was first
吴玮, 宋凌春, Shaik, S, Wu, W, Song, LC, Luo, Y   +5 more
core   +1 more source

Semisynthetic Amides of Amphotericin B and Nystatin A₁: A Comparative Study of In Vitro Activity/Toxicity Ratio in Relation to Selectivity to Ergosterol Membranes

Antibiotics, 2023
Polyene antifungal amphotericin B (AmB) has been used for over 60 years, and remains a valuable clinical treatment for systemic mycoses, due to its broad antifungal activity and low rate of emerging resistance.
Anna Tevyashova, Svetlana Efimova, Alexander Alexandrov, Olga Omelchuk, Eslam Ghazy, Elena Bychkova, Georgy Zatonsky, Natalia Grammatikova, Lyubov Dezhenkova, Svetlana Solovieva, Olga Ostroumova, Andrey Shchekotikhin   +11 more
doaj   +1 more source

Energetics and Dynamics of the Low-Lying Electronic States of Constrained Polyenes: Implications for Infinite Polyenes

, 2016
Steady-state and ultrafast transient absorption spectra were obtained for a series of conformationally constrained, isomerically pure polyenes with 5–23 conjugated double bonds (N). These data and fluorescence spectra of the shorter polyenes reveal the N
Nicole L. Wagner (1309209), Robert R. Birge (1309212), Richard R. Schrock (1295601), Tomáš Polívka (1480165), Miriam M. Enriquez (1989508), Alexandra Y. Peacock-Villada (1989505), Corina Scriban (1989502), Ronald L. Christensen (1989511), Harry A. Frank (1336878)   +8 more
core   +1 more source