Results 71 to 80 of about 5,737,181 (292)

Experimental observations of medium and small scale electrostatic waves associated with ionospheric electron density [PDF]

open access: yesGeofísica Internacional, 2004
On 18 December, 1995 at 21:17 hrs (LT) an electric field double probe, a Langmuir probe, and a High Frequency Capacitance probe were flown from the equatorial rocket launching station Alcantara (2.31°S; 44.4°W) in Brazil on board a Brazilian SONDA III ...
M. A. Abdu   +2 more
doaj  

Control of tunable, monoenergetic laser-plasma-accelerated electron beams using a shock-induced density downramp injector

open access: yesPhysical Review Accelerators and Beams, 2017
Control of the properties of laser-plasma-accelerated electron beams that were injected along a shock-induced density downramp through precision tailoring of the density profile was demonstrated using a 1.8 J, 45 fs laser interacting with a mm-scale gas ...
K. K. Swanson   +11 more
doaj   +1 more source

Structural studies and functional engineering of NanX: an anhydro‐sialic acid transporter from Escherichia coli

open access: yesFEBS Open Bio, EarlyView.
Biophysical characterisation shows that NanX, a membrane transport protein from the major facilitator superfamily (MFS), forms both monomers and dimers after purification. AlphaFold modelling and substrate docking provide information on residues likely involved in substrate recognition for NanX and another MFS member, NanT.
Michael C. Newton‐Vesty   +13 more
wiley   +1 more source

Measurement of the electron-density profile in a discharge-ablated capillary waveguide.

open access: yes, 1999
We present the results of time-resolved interferometric measurements of the electron-density profile in a discharge-ablated capillary waveguide. We observe the development of a pronounced axial minimum in the electron-density profile with a relative ...
Hooker, Simon   +3 more
core   +1 more source

Laser radiation pressure proton acceleration in gaseous target

open access: yesMatter and Radiation at Extremes, 2017
An analytical model for hole boring proton acceleration by a circularly-polarized CO2 laser pulse in a gas jet is developed. The plasma density profile near the density peak is taken to be rectangular, with inner region thickness l around a laser ...
V.K. Tripathi, Tung-Chang Liu, Xi Shao
doaj   +1 more source

In silico and in vitro exploration of a tyrosinase for biocatalytic production of catechols

open access: yesFEBS Open Bio, EarlyView.
Tyrosinase from Ralstonia pseudosolanacearum is a promising biocatalyst for producing valuable catechols from monophenol substrates. This tyrosinase is uniquely suited to this due to its high monophenolase : diphenolase ratio. We combined in silico docking and in vivo kinetic characterisation of this tyrosinase with 11 industrially relevant monophenols,
James Britton   +6 more
wiley   +1 more source

Suppression of microbunching instability via a transverse gradient undulator

open access: yesNew Journal of Physics, 2015
The microbunching instability in the linear accelerator (linac) of a free-electron laser facility has always been a problem that degrades the electron beam quality.
Chao Feng   +4 more
doaj   +1 more source

Protocol for quantifying miRNA trafficking across the endosomal membrane

open access: yesFEBS Open Bio, EarlyView.
An in vitro protocol measures miRNA uptake into endosomes isolated from mammalian cell extracts, which are free of subcellular contaminants. Performed at 37 °C in the presence of ATP, it ensures the import of single‐stranded miRNA into the endosomal lumen.
Syamantak Ghosh   +2 more
wiley   +1 more source

Investigation of transient transport dynamics induced by compact torus injection in the EAST tokamak

open access: yesNuclear Fusion
The rapid increase in plasma core electron temperature triggered by cold plasma injection has long been recognized as compelling evidence of nonlocal transport.
Zhihao Zhao   +18 more
doaj   +1 more source

Longitudinal electron beam and free electron laser microbunch measurements using off-phase rf acceleration

open access: yesPhysical Review Special Topics. Accelerators and Beams, 2000
Magnetic dispersion followed by off-phase rf acceleration and an energy spectrometer were used to measure the longitudinal density profile of bunched relativistic electron beams with a resolution approaching 100 fs.
Kenneth N. Ricci, Todd I. Smith
doaj   +1 more source

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