Results 41 to 50 of about 1,274,578 (287)

Signal velocity, causality, and quantum noise in superluminal light pulse propagation

, 2001
We consider pulse propagation in a linear anomalously dispersive medium where the group velocity exceeds the speed of light in vacuum (c) or even becomes negative. A signal velocity is defined operationally based on the optical signal-to-noise ratio, and
A. Dogariu, A. Dogariu, A. Kuzmich, B. E. A. Saleh, B. Segev, C. M. Caves, E. Desurvire, G. Diener, H. A. Haus, J. Oppenheim, L. Brillouin, L. J. Wang, L. J. Wang, L. Mandel, P. W. Milonni, P. W. Milonni, R. Y. Chiao, R. Y. Chiao, R. Y. Chiao, S. Chu, W. K. Wooters, Y. Aharonov, Y. Yamamoto   +22 more
core   +1 more source

Assessing Cognitive Functioning in Children With Brain Tumors: Interaction of Neighborhood Social Determinants of Health and Neurological Risk

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background This study investigated how neighborhood‐level social determinants of health (SDOH), including redlining and neurological risk, interact to influence cognitive outcomes in children treated for brain tumors (CTBT). Methods A retrospective chart review of 161 CTBT aged 5–17 was conducted.
Alannah R. Srsich, Manali Zope, Peter M. Fantozzi, Cassie N. Kline, Iris Paltin, Matthew C. Hocking   +5 more
wiley   +1 more source

Multifrequency Bessel beams with adjustable group velocity and longitudinal acceleration in free space

New Journal of Physics, 2022
The group velocity of an optical beam in free space is usually considered to be equal to the speed of light in vacuum. However, it has been recently realized that, by structuring the beam’s angular and temporal spectra, one can achieve well pronounced ...
P Hildén, E Ilina, M Kaivola, A Shevchenko   +3 more
doaj   +1 more source

Kinematics and morphology of ionized gas in Hickson Compact Group 18 [PDF]

, 2000
We present new observations of $H\alpha $ emission in the Hickson Compact Group 18 (HCG 18) obtained with a scanning Fabry-Perot interferometer. The velocity field does not show motions of individual group members but, instead, a complex common velocity ...
Amram P., Amram P., C. Balkowski, C. Mendes de Oliveira, H. Plana, Hickson P., Laval A., P. Amram, Shostak G. S., Tomita A.   +9 more
core   +2 more sources

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source

Using electric fields for pulse compression and group velocity control

, 2016
In this article, we experimentally demonstrate a new way of controlling the group velocity of an optical pulse by using a combination of spectral hole burning, slow light effect and linear Stark effect in a rare-earth-ion-doped crystal.
Kinos, Adam, Kröll, Stefan, Li, Qian, Rippe, Lars, Thuresson, Axel   +4 more
core   +1 more source

Measurements of group velocity of light in the lake Baikal water [PDF]

, 2002
The results of direct measurements of group velocity of light in the lake Baikal water at the depth of 1100 m are presented. The lake Baikal water dispersion has been measured at three wavelengths: 370 nm, 470 nm and 525 nm.
B.K. Lubsandorzhiev, Bagduev, Belolaptikov, Kuzmichev, Landau, P.G. Pokhil, Price, R.V. Vasiliev, Vasiliev, Y.E. Vyatchin   +9 more
core   +2 more sources

The newfound relationship between extrachromosomal DNAs and excised signal circles

FEBS Letters, EarlyView.
Extrachromosomal DNAs (ecDNAs) contribute to the progression of many human cancers. In addition, circular DNA by‐products of V(D)J recombination, excised signal circles (ESCs), have roles in cancer progression but have largely been overlooked. In this Review, we explore the roles of ecDNAs and ESCs in cancer development, and highlight why these ...
Dylan Casey, Zeqian Gao, Joan Boyes
wiley   +1 more source

ON THE GROUP VELOCITY OF WHISTLING ATMOSPHERICS

Solar-Terrestrial Physics, 2021
The dynamic spectrum of a whistling atmospheric is a signal of falling tone, and the group delay time of the signal as a function of frequency is formed as a result of propagation of a broadband pulse in a medium (magnetospheric plasma) with a quadratic ...
A.V. Guglielmi, B.I. Klain, A.S. Potapov
doaj   +1 more source

Structural instability impairs function of the UDP‐xylose synthase 1 Ile181Asn variant associated with short‐stature genetic syndrome in humans

FEBS Letters, EarlyView.
The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li, Pedro A. Sánchez‐Murcia, Bernd Nidetzky   +2 more
wiley   +1 more source