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UV absorption by silicate cloud precursors in ultra-hot Jupiter WASP-178b.
Nature
April 2022
Department of Physics, Bryn Mawr College, Bryn Mawr, PA, USA.
Aerosols have been found to be nearly ubiquitous in substellar atmospheres. The precise temperature at which these aerosols begin to form in exoplanets has yet to be observationally constrained. Theoretical models and observations of muted spectral features indicate that silicate clouds play an important role in exoplanets between at least 950 and 2,100 K (ref.
View Article and Find Full Text PDFOzone Formation in Ternary Collisions: Theory and Experiment Reconciled.
Phys Rev Lett
March 2022
Department of Physics, University of Central Florida, Florida 32816, USA.
The present Letter shows that the formation of ozone in ternary collisions O+O_{2}+M-the primary mechanism of ozone formation in the stratosphere-at temperatures below 200 K (for M=Ar) proceeds through a formation of a temporary complex MO_{2}, while at temperatures above ∼700 K, the reaction proceeds mainly through a formation of long-lived vibrational resonances of O_{3}^{*}. At intermediate temperatures 200-700 K, the process cannot be viewed as a two-step mechanism, often used to simplify and approximate collisions of three atoms or molecules. The developed theoretical approach is applied to the reaction O+O_{2}+Ar because of extensive experimental data available.
View Article and Find Full Text PDFResonant interaction between excitonic transitions of molecules and localized electromagnetic field allows the formation of hybrid light-matter polaritonic states. This hybridization of the light and the matter states has been shown to significantly alter the intrinsic properties of molecular ensembles placed inside the optical cavity. Here, we have observed strong coupling of excitonic transition in a pair of closely located organic dye molecules demonstrating an efficient donor-to-acceptor resonance energy transfer with the mode of a tuneable open-access cavity.
View Article and Find Full Text PDFTissue folding at the organ-meristem boundary results in nuclear compression and chromatin compaction.
Proc Natl Acad Sci U S A
February 2021
Laboratoire de Reproduction et Développement des Plantes, Université de Lyon, Université Claude Bernard Lyon 1, ENS de Lyon, Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (INRAE), CNRS, 69364 Lyon Cedex 07, France;
Artificial mechanical perturbations affect chromatin in animal cells in culture. Whether this is also relevant to growing tissues in living organisms remains debated. In plants, aerial organ emergence occurs through localized outgrowth at the periphery of the shoot apical meristem, which also contains a stem cell niche.
View Article and Find Full Text PDFComparability of Raman Spectroscopic Configurations: A Large Scale Cross-Laboratory Study.
Anal Chem
December 2020
Institute of Physical Chemistry and Abbe Center of Photonics, University Jena, 07743 Jena, Germany.
The variable configuration of Raman spectroscopic platforms is one of the major obstacles in establishing Raman spectroscopy as a valuable physicochemical method within real-world scenarios such as clinical diagnostics. For such real world applications like diagnostic classification, the models should ideally be usable to predict data from different setups. Whether it is done by training a rugged model with data from many setups or by a primary-replica strategy where models are developed on a 'primary' setup and the test data are generated on 'replicate' setups, this is only possible if the Raman spectra from different setups are consistent, reproducible, and comparable.
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