Results 71 to 80 of about 171,105 (301)

Key Mechanistic Features in Palladium-Catalyzed Methylcyclopropanation of Norbornenes With Vinyl Bromides: Insights From DFT Calculations

Frontiers in Chemistry, 2019
DFT calculations were performed to elucidate mechanistic details of an unusual palladium-catalyzed methylcyclopropanation from [2 + 1] cycloadditions of (Z)-2-bromovinylbenzene and endo-N-(p-tolyl)-norbornenesuccinimide.
Fang Ying, Fang Ying, Yutong Zhang, Chuyue Xiang, Zhijun Song, Hujun Xie, Weiliang Bao   +6 more
doaj   +1 more source

Electron transport through dipyrimidinyl-diphenyl diblock molecular wire: protonation effect

, 2006
Recently, rectifying direction inversion has been observed in dipyrimidinyl-diphenyl (PMPH) diblock molecular wire [J. Am. Chem. Soc. (2005) 127, 10456], and a protonation mechanism was suggested to explain this interesting phenomena.
A. Aviram, A. Nitzan, C. Joachim, F. Chen, G. M. Morales, I. I. Oleynik, J. Huang, J. M. Soler, J. P. Perdew, J. Taylor, J. Taylor, Jing Huang, JinLong Yang, M. Brandbyge, M. J. Frisch, M.-K. Ng, M.-K. Ng, N. Troullier, P. Jiang, QunXiang Li, R. Landauer, R. M. Metzger, S. K. Nielsen, X. J. Wu, Y. Girard, Y. Xue, Z. Li, Z. Li, Z. Li, ZhenYu Li   +29 more
core   +1 more source

Spectroscopic Properties of Polycyclic Aromatic Compounds. Examination of Nitromethane as a Selective Fluorescence Quenching Agent for Alternant Polycyclic Aromatic Nitrogen Hetero-Atom Derivatives [PDF]

, 1992
Article on the spectroscopic properties of polycyclic aromatic compounds and an examination of nitromethane as a selective fluorescence quenching agent for alternant polycyclic aromatic nitrogen hetero-atom ...
Acree, William, Kimihiro, Hiruta, Langhals, Heinz, Tanga, Mary, Tokita, Sumio, Tucker, Sheryl A.   +5 more
core   +1 more source

Polarization‐resolved femtosecond Vis/IR spectroscopy tailored for resolving weak signals in biological samples using minimal sample volume

FEBS Open Bio, EarlyView.
Unique biological samples, such as site‐specific mutant proteins, are available only in limited quantities. Here, we present a polarization‐resolved transient infrared spectroscopy setup with referencing to improve signal‐to‐noise tailored towards tracing small signals. We provide an overview of characterizing the excitation conditions for polarization‐
Clark Zahn, Karsten Heyne
wiley   +1 more source

Molecular properties of a viral heliorhodopsin, V2HeR2

Biophysics and Physicobiology
Heliorhodopsin (HeR) is a family of microbial rhodopsin discovered in 2018, whose genes are found from archaea, bacteria, unicellular eukaryotes, and giant viruses.
Ritsu Mizutori, Kota Katayama, Masae Konno, Keiichi Inoue, Oded Béjà, Hideki Kandori   +5 more
doaj   +1 more source

Proton Availability at the Air/Water Interface [PDF]

, 2010
The acidity of the water surface sensed by a colliding gas is determined in experiments in which the protonation of gaseous trimethylamine (TMA) on aqueous microjets is monitored by online electrospray mass spectrometry as a function of the pH of the ...
Colussi, A. J., Enami, Shinichi, Hoffmann, Michael R.   +2 more
core   +2 more sources

C2α‐carbanion‐protonating glutamate discloses tradeoffs between substrate accommodation and reaction rate in actinobacterial 2‐hydroxyacyl‐CoA lyase

FEBS Open Bio, EarlyView.
Enzymes of the 2‐hydroxyacyl‐CoA lyase group catalyze the condensation of formyl‐CoA with aldehydes or ketones. Thus, by structural adaptation of active sites, practically any pharmaceutically and industrially important 2‐hydroxyacid could be biotechnologically synthesized. Combining crystal structure analysis, active site mutations and kinetic assays,
Michael Zahn, Barbara Seroka, Ryszard Lazny, Zenon Lotowski, Thore Rohwerder   +4 more
wiley   +1 more source

Crystal structure of bis[bis(4-azaniumylphenyl) sulfone] tetranitrate monohydrate

Acta Crystallographica Section E: Crystallographic Communications, 2017
In the title compound, the hydrated tetra(nitrate) salt of dapsone (4,4′-diaminodiphenylsulfone), 2C12H14N2O2S2+·4NO3−·H2O {alternative name: bis[bis(4,4′-diazaniumylphenyl) sulfone] tetranitrate monohydrate}, the cations are conformationally similar ...
Amani Hind Benahsene, Lamia Bendjeddou, Hocine Merazig   +2 more
doaj   +1 more source

Mechanism of H_2 Evolution from a Photogenerated Hydridocobaloxime [PDF]

, 2010
Proton transfer from the triplet excited state of brominated naphthol to a difluoroboryl bridged Co^I-diglyoxime complex, forming Co^(III)H, was monitored via transient absorption. The second-order rate constant for Co^(III)H formation is in the range (3.
Dempsey, Jillian L., Gray, Harry B., Winkler, Jay R.   +2 more
core   +1 more source

Large‐scale bidirectional arrayed genetic screens identify OXR1 and EMC4 as modifiers of αSynuclein aggregation

FEBS Open Bio, EarlyView.
Activation of the mitochondrial protein OXR1 increases pSyn129 αSynuclein aggregation by lowering ATP levels and altering mitochondrial membrane potential, particularly in response to MSA‐derived fibrils. In contrast, ablation of the ER protein EMC4 enhances autophagic flux and lysosomal clearance, broadly reducing α‐synuclein aggregates.
Sandesh Neupane, Lea Nikolić, Lorenzo Maraio, Thomas Goiran, Nathan Karpilovsky, Stefano Sellitto, Vangelis Bouris, Jiang‐An Yin, Ronald Melki, Edward A Fon, Adriano Aguzzi, Elena De Cecco   +11 more
wiley   +1 more source