Results 81 to 90 of about 100,070 (278)

History of Atomic Clocks

Journal of Research of the National Bureau of Standards, 1983
The history of atomic and molecular standards of time and frequency is traced from the earliest work on molecular and atomic beam resonance techniques to more recent developments that promise improved standards in the future. The various devices currently used as standards are discussed in detail from an historical prospective.
openaire   +2 more sources

Mechanisms of parasite‐mediated disruption of brain vessels

FEBS Letters, EarlyView.
Parasites can affect the blood vessels of the brain, often causing serious neurological problems. This review explains how different parasites interact with and disrupt these vessels, what this means for brain health, and why these processes matter. Understanding these mechanisms may help us develop better ways to prevent or treat brain infections in ...
Leonor Loira, Sílvia Arroz‐Madeira, Cláudio A. Franco, Sara Silva Pereira   +3 more
wiley   +1 more source

Time after time – circadian clocks through the lens of oscillator theory

FEBS Letters, EarlyView.
Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo, Carolin Ector, Hanspeter Herzel   +2 more
wiley   +1 more source

Effect of shield magnetization on variations in the frequency of onboard rubidium atomic clocks

St. Petersburg Polytechnical University Journal: Physics and Mathematics
In the paper, the results of a study of the influence of the magnetic shield magnetization on the relative frequency instability of small-sized rubidium atomic clocks have been presented.
Ermak Sergey, Semenov Vladimir, Baranov Alexey, Rogatin Maxim, Sergeeva Maria   +4 more
doaj   +1 more source

Electronic system for drift clock calculation and synchronization for seafloor observatory [PDF]

, 2016
The paper describes a new electronic device that allows an easily measurement of the drift between a reference time source (usually GPS) and an atomic rubidium clock which is normally used in seafloor observatories.
Apponi, Umberto, Embriaco, Davide, Marinaro, Giuditta, Romano, Vincenzo   +3 more
core  

An atomic clock with $10^{-18}$ instability

, 2013
Atomic clocks have been transformational in science and technology, leading to innovations such as global positioning, advanced communications, and tests of fundamental constant variation.
Beloy, K., Hinkley, N., Lemke, N. D., Ludlow, A. D., Oates, C. W., Phillips, N. B., Pizzocaro, M., Schioppo, M., Sherman, J. A.   +8 more
core   +1 more source

Multiple ETS family transcription factors bind mutant p53 via distinct interaction regions

FEBS Letters, EarlyView.
Mutant p53 gain‐of‐function is thought to be mediated by interaction with other transcription factors. We identify multiple ETS transcription factors that can bind mutant p53 and found that this interaction can be promoted by a PXXPP motif. ETS proteins that strongly bound mutant p53 were upregulated in ovarian cancer compared to ETS proteins that ...
Stephanie A. Metcalf, Nicholas F. Downing, Kaitlyn M. Mills, Samuel C. Metcalfe, Alexander E. Kritzer, Lindsey D. Mayo, Peter C. Hollenhorst   +6 more
wiley   +1 more source

The quantum Allan variance

New Journal of Physics, 2016
The instability of an atomic clock is characterized by the Allan variance, a measure widely used to describe the noise of frequency standards. We provide an explicit method to find the ultimate bound on the Allan variance of an atomic clock in the most ...
Krzysztof Chabuda, Ian D Leroux, Rafał Demkowicz-Dobrzański   +2 more
doaj   +1 more source

Lorentz and CPT Tests in Matter and Antimatter

, 2003
A review of recent theoretical work investigating tests of Lorentz and CPT symmetry in atomic and particle systems is presented. A variety of tests in matter and antimatter are discussed, including measurements of anomalous magnetic moments in Penning ...
Alfaro, Amelino-Camelia, Bear, Berglund, Bertolami, Bluhm, Bluhm, Bluhm, Bluhm, Bluhm, Brown, Carroll, Carroll, Chupp, Colladay, Colladay, Colladay, Dehmelt, Drever, Gabrielse, Greenberg, Hawking, Hughes, Hughes, Isgur, Jackiw, Kostelecký, Kostelecký, Kostelecký, Kostelecký, Kostelecký, Kostelecký, Kostelecký, Kostelecký, Lamoreaux, Lüders, Mittleman, Pauli, Phillips, Prestage, Robert Bluhm, Schwinberg, Schwinger, Van Dyck   +43 more
core   +1 more source

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