Article
Biochemistry & Molecular Biology
Shijun Wu, Shuangjia Li, Jianhua Yin, Zhiliang Yu
Summary: Hfq regulates the QS system in Pseudoalteromonas sp. R3 by controlling the expression of yasI and yasR, and sRNA00002 plays a positive role in this regulation. The deletion of hfq leads to decreased expression of yasI and yasR, resulting in the abolished production of AHLs in strain R3.
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Brian K. Kendrick
Summary: A study was conducted on the Li + LiNa reaction using quantum dynamics, revealing significant reactivity even at collision temperatures approaching absolute zero. The results showed that the reaction, occurring in the ground electronic state of Li2Na with a deep attractive potential well, supports the formation of complexes. Multiple shape resonances were observed in the rate coefficients, indicating unique quantum fingerprints in the angular distributions for each product rotational state due to quantum interference and shape resonance contributions.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Optics
H. B. Pedersen, H. Juul, F. K. Mikkelsen, A. P. Rasmussen, L. H. Andersen
Summary: In this study, a cryogenic multipole radio-frequency (RF) ion trap was set up and characterized for the accumulation and cooling of mass-selected ions before injection into the SAPHIRA storage ring. OH- anions were used to characterize the RF trap setup, and the threshold photodetachment cross section measured after storage in SAPHIRA was used as a probe of the rotational temperature. The final rotational temperature of the OH- ions was found to be strongly influenced by the density of cooled He and the actual number of trapped ions, while being less affected by the time-varying field of the trap.
Article
Physics, Fluids & Plasmas
I Gissis, A. Fisher, E. Behar
Summary: Galactic and extragalactic x-ray sources are absorbed by molecules and atoms in giant molecular clouds, providing valuable information about their composition and physical state. Using a laboratory Z-pinch x-ray source, researchers mimic this phenomenon and demonstrate the differences between molecular and atomic lines in x-ray spectra. Increasing gas density leads to a higher population of excited states, affecting the absorption spectra.
Article
Chemistry, Physical
Pablo G. Jambrina, Masato Morita, James F. E. Croft, F. Javier Aoiz, Naduvalath Balakrishnan
Summary: This study discusses an experiment using the Stark-induced adiabatic Raman passage technique, which investigates the angular distribution between He and aligned D2 molecules at cold collision energies. Results show the presence of an n=2 resonance in low energies in the experiment, while a strong n=1 resonance is predicted at low energies in simulations. Agreement with experimental results requires the exclusion of this n=1 resonance.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Can Xu, Xian-Wei Hu, Jiang-Yu Yu, Peng-Wei Li, Ai-Min Liu, Shao-Hua Luo, Zhong-Ning Shi, Zhao-Wen Wang
Summary: This paper simulates the theoretical Raman spectra of the ionic groups in the YCl3-KCl molten system and investigates the ionic structures in different YCl3-KCl molten salt systems. It is found that YCl63-, Y2Cl7-, Y2Cl82-, and Y2Cl93- exist in the molten system, and their relative contents change with temperature and YCl3 content. The wave function analysis reveals the net charge, electron migration direction, reactive sites, and bond breaking order in each ionic group.
Article
Electrochemistry
Yang Wang, Binh Hoang, John Hoerauf, Cholho Lee, Chuan-Fu Lin, Gary W. Rubloff, Sang Bok Lee, Alexander C. Kozen
Summary: LGPS is a superionic conductor that shows potential for solid-state Li metal batteries, with researchers successfully using hot pressing to fabricate pellets with the highest density and ionic conductance. The XPS analysis indicates no chemical degradation of LGPS powder during the hot pressing process.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Physics, Multidisciplinary
M. Fan, C. A. Holliman, X. Shi, H. Zhang, M. W. Straus, X. Li, S. W. Buechele, A. M. Jayich
Summary: A novel all-optical mass spectrometry technique has been introduced for identifying trapped ions using laser-cooled ions with high resolution in a short time. This method was successfully applied to identify cold, trapped RaOH+ and RaOCH3+ ions, which are sensitive to time and parity violations. The nondestructive nature and high speed of this technique make it promising for identifying molecular ions prior to optical spectroscopy and studying chemical reactions in ion traps.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Shinsuke Haze, Jose P. D'Incao, Dominik Dorer, Markus Deiss, Eberhard Tiemann, Paul S. Julienne, Johannes Hecker Denschlag
Summary: We explore the physical origin and general validity of a propensity rule for the conservation of hyperfine spin state in three-body recombination. By testing the rule on Rb-85, which has different scattering properties from Rb-87, we observe that the rule also holds for Rb-85. Through experimental observations and theoretical analysis, we gain understanding of the conservation of hyperfine spin state and identify criteria to judge its applicability to other elements and collision channels.
PHYSICAL REVIEW LETTERS
(2022)
Article
Biochemistry & Molecular Biology
Krishna Kumar, Abhijit Chakraborty, Saikat Chakrabarti
Summary: The integrated online platform 'PresRAT' is able to identify and characterize bacterial small-RNA (sRNA) sequences and their mRNA targets by using primary and secondary structural attributes. It can predict sRNA sequences from bacterial genomes, find probable target mRNAs, and generate 3D models of sRNA and sRNA-mRNA duplex regions.
Article
Physics, Condensed Matter
Diptimayee Tripathy, Jyotshna Saikia, Amarjyoti Saikia, Arvind Pandey
Summary: In this study, Ti and Gd co-doped Bi2VO5.5 compounds were reported, showing suppression of phase transition and enhanced ionic conductivity in the co-doped system. The enhancement in conductivity was explained through structural and Raman spectra analysis, which was corroborated with electrochemical impedance analysis.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Instruments & Instrumentation
Raghed Bejjani, Anthony Roucou, Xavier Urbain, Konstantin Moshkunov, Guilhem Vanlancker, Clement Lauzin
Summary: The spectroscopy of transient anions and radicals by gated and accelerated time-of-flight experiment is a new instrument developed at UCLouvain. It measures high-resolution photodissociation spectra of mass-selected ions and has been successfully used to analyze the rovibronic bands of N2O+. The instrument has proven its reliability and precision through experiments and analysis.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Engineering, Electrical & Electronic
Kuldeep Singh Chikara, Anup Kumar Bera, Amit Kumar, Seikh Mohammad Yusuf
Summary: The crystal structure and electrical properties of A2Cu3Ge4O12 (where A = Na, K) were investigated using neutron diffraction and electrical impedance spectroscopy. The compounds K2Cu3Ge4O12 (KCGO) and Na2Cu3Ge4O12 (NCGO) have perfect 2D and quasi-2D alkali metal ion layers, respectively. Both compounds exhibit small polaron hopping for dc conductivity, with single activation energy over the entire temperature range. The ac conductivity curves for both compounds follow Jonscher's power law.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Review
Chemistry, Physical
Krishnan Damodaran
Summary: This review presents recent developments in the application of NMR spectroscopic techniques in the study of ionic liquids, focusing on their use for structural characterization and dynamics exploration.
PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY
(2022)
Article
Chemistry, Physical
Ming-Ming Zhao, Bin-Bin Wang, Gao-Ren Wang, Bina Fu, Maksim Shundalau, Yong-Chang Han
Summary: By studying the He-4-He-4-Ne-20 collision system, the researchers have calculated the rates for the three-body recombination and collision-induced dissociation processes. It was found that He-4(2) (l = 0) is the dominant product of recombination at ultracold temperatures, with a rate significantly higher than the other three products.
JOURNAL OF CHEMICAL PHYSICS
(2023)