Results 41 to 50 of about 1,706,590 (302)

CAVITY ENHANCED ULTRAFAST TRANSIENT ABSORPTION SPECTROSCOPY [PDF]

Proceedings of the 70th International Symposium on Molecular Spectroscopy, 2015
We present a new technique using a frequency comb laser and optical cavities for performing ultrafast transient absorption spectroscopy with improved sensitivity. Resonantly enhancing the probe pulses, we demonstrate a sensitivity of $Δ$OD $ = 1 \times 10^{-9}/\sqrt{\mbox{Hz}}$ for averaging times as long as 30 s per delay point ($Δ$OD$_{min} = 2 ...
Reber, Melanie A. R., Chen, Yuning, Allison, Thomas K.   +2 more
openaire   +2 more sources

A Time-Resolved Study on the Reactivity of Alcoholic Drinks with the Hydroxyl Radical

Molecules, 2019
Reactive oxygen species (ROS) can provoke damage to cells, where their concentrations are regulated by antioxidants. As the hydroxyl radical (•OH) is the most oxidizing ROS, we have focused our attention on the use of a mechanistically based time ...
Gemma M. Rodriguez-Muñiz, Miguel A. Miranda, M. Luisa Marin   +2 more
doaj   +1 more source

Attosecond transient absorption of a continuum threshold

, 2020
The laser-field-modified dipole response of the first ionization threshold of helium is studied by means of attosecond transient absorption spectroscopy.
Blaettermann, Alexander, Pfeifer, T., Pfeifer, Thomas, Birk, Paul, Blättermann, A., Bartschat, Klaus, Hartmann, M., Birk, P., Borisova, G., Stooß, V., Hartmann, Maximilian, Bartschat , K., Ott, C., Ott, Christian, Stooss, Veit, Heldt, Tobias, Heldt, T., Borisova, Gergana D   +17 more
core   +1 more source

Revealing electronic state-switching at conical intersections in alkyl iodides by ultrafast XUV transient absorption spectroscopy [PDF]

, 2020
The reaction trajectories of photoexcited molecules may involve transitions through conical intersections, which are ubiquitous in nature but challenging to characterize.
Stephen R. Leone, Marggi Poullaín, Sonia, Yuki Kobayashi, Daniel M. Neumark, Poullain, Sonia M, Kobayashi, Yuki, Prendergast, David, Leone, Stephen R, Neumark, Daniel M, Lou Barreau, Chang, Kristina, Sonia M. Poullain, Kristina F. Chang, Reduzzi, Maurizio, Leone, Stephen, Chang, Kristina F, Maurizio Reduzzi, David Prendergast, Neumark, Daniel, Han Wang, Barreau, Lou, Wang, Han, Wang H., Neumark D. M., Poullain S. M., Leone S. R., Prendergast D., Barreau L., Chang K. F., Reduzzi M., Kobayashi Y.   +30 more
core   +1 more source

Transient-absorption phases with strong probe and pump pulses

, 2017
The quantum dynamics of a system of Rb atoms, modeled by a V-type three-level system interacting with intense probe and pump pulses, are studied. The time-delay-dependent transient-absorption spectrum of an intense probe pulse is thus predicted, when ...
Vadim Becquet (17500137), Stefano M. Cavaletto (8044571)   +1 more
core   +1 more source

A transient absorption study of allophycocyanin

Journal of Chemical Sciences, 2002
Transient dynamics of allophycocyanin trimers and monomers are observed by using the pump-probe, transient absorption technique. The origin of spectral components of the transient absorption spectra is discussed in terms of both kinetics and spectroscopy.
Y. J. Shiu, J. M. Zhang, M. Hayashi, V. Gulbinas, C. M. Yang, S. H. Lin   +5 more
openaire   +2 more sources

Enteropathogenic E. coli shows delayed attachment and host response in human jejunum organoid‐derived monolayers compared to HeLa cells

FEBS Letters, EarlyView.
Enteropathogenic E. coli (EPEC) infects the human intestinal epithelium, resulting in severe illness and diarrhoea. In this study, we compared the infection of cancer‐derived cell lines with human organoid‐derived models of the small intestine. We observed a delayed in attachment, inflammation and cell death on primary cells, indicating that host ...
Mastura Neyazi, Pilar Samperio Ventayol, Natalie Burkard, Nicolas Schlegel, Carmen Aguilar, Sina Bartfeld   +5 more
wiley   +1 more source

Degradation mechanism of the von Willebrand factor A2 domain by nattokinase

FEBS Letters, EarlyView.
Nattokinase, a natto‐derived protease, exhibits potent antithrombotic effects. This study demonstrates that nattokinase directly cleaves the von Willebrand factor (vWF) A2 domain in vitro. Unlike the native regulator ADAMTS13, nattokinase degrades folded vWF independently of shear stress.
Ryuichi Hyakumoto, Masatomo So, Ayako Furukawa, Kenji Sugase   +3 more
wiley   +1 more source

From mice to humans—divergent strategies for intestinal homeostasis and regeneration

FEBS Letters, EarlyView.
Recent advances such as organoid genome editing, xenotransplantation, imaging, and whole‐genome sequencing have enabled direct studies of human intestinal stem cells (ISCs). These studies reveal species‐specific features, including slower ISC proliferation, distinct injury responses, slower somatic mutation accumulation in humans, and an inverse ...
Keiko Ishikawa, Shinya Sugimoto, Toshiro Sato   +2 more
wiley   +1 more source

Experimental and Theoretical Study of the Ultrafast Dynamics of a Ni2Dy2‐Compound in DMF After UV/Vis Photoexcitation

ChemistryOpen, 2022
We present a combined experimental and theoretical study of the ultrafast transient absorption spectroscopy results of a {Ni2Dy2}‐compound in DMF, which can be considered as a prototypic molecule for single molecule magnets.
S. Sold, B. C. Mummaneni, N. C. Michenfelder, Y. Peng, A. K. Powell, A.‐N. Unterreiner, G. Lefkidis, W. Hübner   +7 more
doaj   +1 more source