Results 71 to 80 of about 4,053,623 (330)

Role of line-of-sight cosmic ray interactions in forming the spectra of distant blazars in TeV gamma rays and high-energy neutrinos

open access: yes, 2011
Active galactic nuclei (AGN) can produce both gamma rays and cosmic rays. The observed high-energy gamma-ray signals from distant blazars may be dominated by secondary gamma rays produced along the line of sight by the interactions of cosmic-ray protons ...
Beacom, John F.   +3 more
core   +1 more source

Overview of molecular signatures of senescence and associated resources: pros and cons

open access: yesFEBS Open Bio, EarlyView.
Cells can enter a stress response state termed cellular senescence that is involved in various diseases and aging. Detecting these cells is challenging due to the lack of universal biomarkers. This review presents the current state of senescence identification, from biomarkers to molecular signatures, compares tools and approaches, and highlights ...
Orestis A. Ntintas   +6 more
wiley   +1 more source

Search for Joint Multimessenger Signals from Potential Galactic Cosmic-Ray Accelerators with HAWC and IceCube

open access: yesThe Astrophysical Journal
The origin of high-energy galactic cosmic rays is yet to be understood, but some galactic cosmic-ray accelerators can accelerate cosmic rays up to PeV energies.
R. Alfaro   +495 more
doaj   +1 more source

The response of monoenergetic gamma rays in finite media are investigated [PDF]

open access: yes, 1969
In a study of the transport of radiation in matter, the response parameters of monoenergetic gamma rays incident on various materials with finite geometries were calculated on a CDC 3600 computer.
Snow, W. J.
core   +1 more source

Gamma-Ray Bursts

open access: yesStars and Stellar Processes, 2016
Gamma-ray bursts (GRBs) are short periods of γ-rays (high energy light waves) that are detected on Earth. They were originally detected by satellites that were designed to watch for nuclear weapons tests on Earth. GRBs are difficult to study because they
Frédéric Daigne
semanticscholar   +1 more source

Search for the shortest variability at gamma rays in flat-spectrum radio quasars [PDF]

open access: yes, 2011
We report about the search for short-term variability in the high-energy gamma-ray energy band of three flat-spectrum radio quasars (3C 454.3, 3C 273, PKS B1222+216), whose flux at E > 100 MeV exceeded the value of 10^-5 ph cm^-2 s^-1 for at least one ...
L. Foschini   +4 more
semanticscholar   +1 more source

Day/night variations of myeloid and lymphoid cell subsets in the murine inguinal lymph node

open access: yesFEBS Open Bio, EarlyView.
The circadian system is involved in the temporal regulation of the immune system. Our study reveals that two innate immune populations, NKT cells and neutrophils, predominate at the beginning of the day in healthy mice, highlighting how the time of day influences immune responses.
Paula M. Wagner   +6 more
wiley   +1 more source

Gamma rays excited radioluminescence tomographic imaging

open access: yesBioMedical Engineering OnLine, 2018
Background Radionuclide-excited luminescence imaging is an optical radionuclide imaging strategy to reveal the distributions of radioluminescent nanophosphors (RLNPs) inside small animals, which uses radioluminescence emitted from RLNPs when excited by ...
Xuanxuan Zhang   +7 more
doaj   +1 more source

Constraints on the Gamma-Ray Emission from Small Solar System Bodies with the Fermi Large Area Telescope Data

open access: yesThe Astrophysical Journal, 2023
All known small solar system bodies have diameters between a few meters and a few thousands of kilometers. Based on the collisional evolution of solar system bodies, a larger number of asteroids with diameters down to ∼2 m is thought to exist.
S. De Gaetano   +8 more
doaj   +1 more source

Cosmogenic gamma-rays and the composition of cosmic rays [PDF]

open access: yes, 2011
We discuss the prospects of detecting the sources of ultrahigh energy (UHE) cosmic ray (CR) nuclei via their emission of cosmogenic {gamma} rays in the GeV to TeV energy range.
M. Ahlers, J. Salvado
semanticscholar   +1 more source

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