Results 51 to 60 of about 3,754,015 (306)

Structural and biochemical analysis of a B12 superbinder

FEBS Letters, EarlyView.
BtuG proteins are vitamin B12 scavengers in Bacteroides thetaiotaomicron, a dominant human gut bacterium. We present crystal structures of three BtuG homologs bound to cobalamin and its precursor cobinamide, revealing picomolar binding affinities, among the highest known for any natural protein.
Jose M. Martinez Felices, Jacob J. Whittaker, Dirk J. Slotboom, Albert Guskov   +3 more
wiley   +1 more source

Stability diagrams of colliding beams in the Large Hadron Collider

Physical Review Special Topics. Accelerators and Beams, 2014
Most hadron synchrotrons rely on lattice nonlinearities for Landau damping of impedance driven coherent modes of oscillation. However, in a collider, the presence of beam-beam interactions strongly modifies the transverse amplitude detuning and therefore
X. Buffat, W. Herr, N. Mounet, T. Pieloni, S. White   +4 more
doaj   +1 more source

Probing strong-field QED in beam-plasma collisions

Communications Physics, 2023
Ongoing progress in laser and accelerator technology opens new possibilities in high-field science, notably to investigate the largely unexplored strong-field quantum electrodynamics (SFQED) regime where electron-positron pairs can be created directly ...
Aimé Matheron, Pablo San Miguel Claveria, Robert Ariniello, Henrik Ekerfelt, Frederico Fiuza, Spencer Gessner, Max F. Gilljohann, Mark J. Hogan, Christoph H. Keitel, Alexander Knetsch, Mike Litos, Yuliia Mankovska, Samuele Montefiori, Zan Nie, Brendan O’Shea, J. Ryan Peterson, Doug Storey, Yipeng Wu, Xinlu Xu, Viktoriia Zakharova, Xavier Davoine, Laurent Gremillet, Matteo Tamburini, Sébastien Corde   +23 more
doaj   +1 more source

Raman‐based label‐free microscopic analysis of the pancreas in living zebrafish larvae

FEBS Open Bio, EarlyView.
Forward stimulated Raman scattering (F‐SRS) and epi coherent anti‐Stokes Raman scattering (E‐CARS) allow label‐free discrimination of distinct subcellular structures in the pancreas of living zebrafish larvae. Given the straightforward applicability, we anticipate broad implementation of Raman microscopy in other organs and across various biomedical ...
Noura Faraj, Eline M. F. de Lange, Klaas A. Sjollema, Ben N. G. Giepmans   +3 more
wiley   +1 more source

A nonlocal sinusoidal shear deformation beam theory with application to bending, buckling, and vibration of nanobeams [PDF]

, 2012
This paper presents a nonlocal sinusoidal shear deformation beam theory for the bending, buckling, and vibration of nanobeams. The present model is capable of capturing both small scale effect and transverse shear deformation effects of nanobeams, and ...
Thai, Huu-Tai, Vo, Thuc
core   +1 more source

The PADME beam line Monte Carlo simulation

Journal of High Energy Physics, 2022
The PADME experiment at the DAΦNE Beam-Test Facility (BTF) of the INFN Laboratory of Frascati is designed to search for invisible decays of dark sector particles produced in electron-positron annihilation events with a positron beam and a thin fixed ...
The PADME collaboration, F. Bossi, P. Branchini, B. Buonomo, V. Capirossi, A. P. Caricato, G. Chiodini, R. De Sangro, C. Di Giulio, D. Domenici, F. Ferrarotto, S. Fiore, G. Finocchiaro, L. G. Foggetta, A. Frankenthal, M. Garattini, G. Georgiev, A. Ghigo, P. Gianotti, F. Iazzi, S. Ivanov, Sv. Ivanov, V. Kozhuharov, E. Leonardi, E. Long, M. Martino, I. Oceano, F. Oliva, G. C. Organtini, F. Pinna, G. Piperno, M. Raggi, I. Sarra, R. Simeonov, T. Spadaro, S. Spagnolo, E. Spiriti, D. Tagnani, C. Taruggi, P. Valente, A. Variola, E. Vilucchi   +41 more
doaj   +1 more source

Measurements on Beam-Beam Interaction at SPEAR [PDF]

IEEE Transactions on Nuclear Science, 1973
Measurements of luminosity at SPEAR, which were performed at different operational conditions of the storage ring are shown and discussed. The parameters varied are: the current in both beams, the minimum betatron amplitude functions at the collision point, the energy and the vertical betatron frequencies.
M. A. Allen, M. Breidenbach, J. -E. Augustin, A. Boyarski, W. Davies-White, N. Dean, G. Fischer, J. L. Harris, L. Karvonen, R. R. Larsen, M. J. Lee, H. L. Lynch, R. McConnell, P. Morton, J. E. Paterson, J. Rees, B. Richter, A. Sabersky, R. Scholl, R. Schwitters, J. Voss, H. Wiedemann, H. Wiedemann   +22 more
openaire   +1 more source

Effect of terahertz irradiation on DNA damage repair in living cells

FEBS Open Bio, EarlyView.
We investigated the effect of terahertz (THz) wave irradiation on DNA double‐strand break (DSB) repair in living cells. We found that THz irradiation enhanced DSB repair at specific frequencies, whereas heat treatment inhibited it, indicating that this effect is nonthermal and frequency‐specific.
Yuya Ueno, Shota Yamazaki, Hiromichi Hoshina, Masahiko Harata   +3 more
wiley   +1 more source

The second spectrum of Timoshenko beam theory - Further assessment [PDF]

, 2006
A review of contributions and views on the second spectrum of Timoshenko beam theory (TBT) over the past two decades, together with some new results, are presented.
Stephen, N.G.
core   +1 more source

Density distributions of tune shifts from space charge or beam-beam interactions in Gaussian bunches

Physical Review Accelerators and Beams, 2023
The amplitude dependent tune shifts from either space charge or beam-beam interactions are calculated analytically with the inclusion of synchrotron oscillations and multiple interactions around the ring.
Tanaji Sen
doaj   +1 more source