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The unbinding process of a protein-ligand complex of major biological interest was investigated by means of a computational approach at atomistic classical mechanical level. An energy minimisation-based technique was used to determine the…

Biological Physics · Physics 2009-11-13 Elsa S. Henriques , Andrey V. Solov'yov

Mechanical unfolding of RNA structures, ranging from hairpins to ribozymes, using laser optical tweezer (LOT) experiments have begun to reveal the features of the energy landscape that cannot be easily explored using conventional…

Biomolecules · Quantitative Biology 2009-11-13 Changbong Hyeon , D. Thirumalai

A key factor influencing a drug's efficacy is its residence time in the binding pocket of the host protein. Using atomistic computer simulation to predict this residence time and the associated dissociation process is a desirable but…

Soft Condensed Matter · Physics 2015-10-08 Pratyush Tiwary , Jagannath Mondal , Joseph A. Morrone , B. J. Berne

We have investigated the photodynamics of $\beta$-D-glucose employing our field-induced surface hopping method (FISH), which allows us to simulate the coupled electron-nuclear dynamics, including explicitly nonadiabatic effects and…

Chemical Physics · Physics 2018-03-20 Jens Petersen , Joachim O. Lindner , Roland Mitric

Using all atom molecular dynamics simulations, we report spontaneous unzipping and strong binding of small interfering RNA (siRNA) on graphene. Our dispersion corrected density functional theory based calculations suggest that nucleosides…

The Persistent Photoconductivity (PPC) effect was studied in individual tin oxide (SnO2) nanobelts as a function of temperature, in air, helium, and vacuum atmospheres, and low temperature Photoluminescence measurements were carried out to…

Materials Science · Physics 2012-12-12 E. R. Viana , J. C. González , G. M. Ribeiro , A. G. de Oliveira

By exerting mechanical force it is possible to unfold/refold RNA molecules one at a time. In a small range of forces, an RNA molecule can hop between the folded and the unfolded state with force-dependent kinetic rates. Here, we introduce a…

Biological Physics · Physics 2012-08-27 M. Manosas , J. -D. Wen , P. T. X. Li , S. B. Smith , C. Bustamante , I. Tinoco, , F. Ritort

Certain biochemical reactions can only be triggered after binding of a sufficient number of particles to a specific target region such as an enzyme or a protein sensor. We investigate the distribution of the reaction time, i.e., the first…

Chemical Physics · Physics 2022-10-10 Denis S. Grebenkov , Aanjaneya Kumar

We report a comprehensive resonant inelastic x-ray scattering (RIXS) study of various iridate materials focusing on core-level excitations and transitions between crystal-field split d-levels. The 2p core hole created at the Ir $L_3$…

Strongly Correlated Electrons · Physics 2018-05-10 Young-June Kim , J. P. Clancy , H. Gretarsson , G. Cao , Yogesh Singh , Jungho Kim , M. H. Upton , D. Casa , T. Gog

We analyze the standardizability of Type Ia supernovae (SNe Ia) in the near-infrared (NIR) by investigating the correlation between observed peak NIR absolute magnitude and post-maximum B-band decline rate. A sample of 27 low-redshift SNe…

An exact general theory of heteronuclear decoupling is presented for spin-1/2 IS systems. RF irradiation applied to the I spins decouples the S spins by reversing the sign of antiphase magnetization. A one-to-one correspondence is…

Chemical Physics · Physics 2015-06-19 Thomas E. Skinner

Proteins are vital biological molecules found in every living organism, and their function is determined by what shape they fold into. Peptides are essentially subsets of proteins, and therefore ideal as model systems for protein folding.…

Biological Physics · Physics 2025-09-11 Åke Andersson , Vitali Zhaunerchyk

Femtosecond dynamics of coherent optical phonons in GeTe/Sb$_{2}$Te$_{3}$ superlattices (SLs), a new class of semiconductor SLs with three different states, have been investigated by using a reflection-type pump-probe technique at various…

Materials Science · Physics 2015-03-23 Muneaki Hase , Yoshinobu Miyamoto , Junji Tominaga

We use femtosecond x-ray diffraction to study the structural response of charge and orbitally ordered Pr$_{1-x}$Ca$_x$MnO$_3$ thin films across a phase transition induced by 800 nm laser pulses. By investigating the dynamics of both…

Time-resolved multi-terahertz (THz) spectroscopy is used to observe an ultrafast, non-thermal electronic phase change in SnSe driven by interband photoexcitation with 1.55 eV pump photons. The transient THz photoconductivity spectrum is…

Materials Science · Physics 2024-02-12 Benjamin J. Dringoli , Mark Sutton , Zhongzhen Luo , Mercouri G. Kanatzidis , David G. Cooke

Hydrogen-rich superluminous supernovae (SLSNe II) are rare. The exact mechanism producing their extreme light curve peaks is not understood. Analysis of single events and small samples suggest that CSM interaction is the main responsible…

The process of ligand-protein unbinding is crucial in biophysics. Water is an essential part of any biological system and yet, many aspects of its role remain elusive. Here, we simulate with state-of-the-art enhanced sampling techniques the…

Biological Physics · Physics 2022-09-30 Narjes Ansari , Valerio Rizzi , Michele Parrinello

Recent progress in the development of superconducting nanowire single-photon detectors (SNSPDs) has delivered excellent performances, and has had a great impact on a range of research fields. The timing jitter, which denotes the temporal…

In this work, three InAs/InAs$_{0.65}$Sb$_{0.35}$ superlattices with different periods were investigated using photoluminescence and photoreflectance measurements and their band structure was simulated using a 14 bulk-band kp model. The…

In this work we present a uniform analysis of the temperature evolution and bolometric luminosity of a sample of 29 type-II supernovae (SNe), by fitting a black body model to their multi-band photometry. Our sample includes only SNe with…

High Energy Astrophysical Phenomena · Physics 2017-11-01 Tamar Faran , Ehud Nakar , Dovi Poznanski