Results 81 to 90 of about 408,744 (292)

Nature or Nurture: LMC-like Dust in the Solar Metallicity Galaxy M31

The Astrophysical Journal
Using the Hubble Space Telescope/Space Telescope Imaging Spectrograph, ultraviolet (UV) extinction curves have been measured in M31 along 13 new sight lines, increasing the M31 sample to 17.
Geoffrey C. Clayton, Petia Yanchulova Merica-Jones, Karl D. Gordon, Marjorie Decleir, Claire E. Murray, Ralph Bohlin, Luciana Bianchi, Philip Massey, Michael J. Wolff   +8 more
doaj   +1 more source

THE LOCAL INTERSTELLAR ULTRAVIOLET RADIATION FIELD

, 2001
I have used theHipparcos Input Catalogue, together with Kurucz model stellar atmospheres and informa-tion on the strength of the interstellar extinction, to create a model of the expected intensity and spectral dis-tribution of the local interstellar ...
Richard Conn Henry
core   +1 more source

Dielectric Permittivity Tensor of Muscovite for Next Generation All Van Der Waals Broadband Photonic Components

Advanced Optical Materials, EarlyView.
Low‐index and low‐loss vdW muscovite represents an emerging robust dielectric platform for the creation of next‐generation all‐vdW nanophotonic architectures. Its utilization as a low‐index building‐block in all‐vdW multilayers enables extreme optical contrast when paired with MoS2, paving the way to the realization of few‐layer ultrathin DBS ...
Meri H. Hayrapetyan, Maksim L. Sargsyan, Davit A. Karakhanyan, Ani P. Khachatryan, Maria A. Levonyan, Dmitrii Litvinov, Maciej Koperski, Artsruni V. Margaryan, Makars Šiškins, Konstantin S. Novoselov, Davit A. Ghazaryan   +10 more
wiley   +1 more source

Combined, table-top extreme-ultraviolet ellipsometry and polarimetry for studying ultrafast processes in matter

JPhys Photonics
We demonstrate the characterization of the complete polarization state of broadband extreme-ultraviolet radiation produced via high-harmonic generation in a gas target, measured with a double-stage polarimeter and a reaction microscope. The ellipsometric
Lénárd Gulyás Oldal, Barnabás Gilicze, Tamás Bartyik, Dániel Kiss, Michele Devetta, Gabriele Zeni, Fabio Frassetto, Luca Poletto, Tamás Csizmadia, Balázs Major   +9 more
doaj   +1 more source

Transparent Single‐Dye NIR Photonic Platform for Multimodal Optical Authentication

Advanced Optical Materials, EarlyView.
A single‐component DHP‐SQ dye integrates visible transparency, near‐infrared (NIR) fluorescence, and photothermal functionality into one molecular platform. NIR‐selective visualization transforms visually imperceptible printed patterns into readily authenticated information, while screen‐printing compatibility enables well‐defined patterning on diverse
Su Jeong Choi, Seung Hyeon Kim, Dayoung Shin, Yeongnam Heo, Minseo Kim, Ji Hyeon Lee, Ji‐Eun Jeong, Young‐Jae Jin, Jin Chul Kim, Hyoung Eun Bae, Young Hoon Son, Sung Jin Park, Sang Hwan Nam, Young Il Park, Hyocheol Jung   +14 more
wiley   +1 more source

Large Variations Seen in First Ultraviolet Spectroscopic M33 Dust Extinction Curves

The Astrophysical Journal
Dust extinction curves provide one of the main avenues to understanding the detailed nature of dust grains and accounting for the effects of dust on observations of many astrophysical objects. For the first time, spectroscopic ultraviolet (UV) extinction
Karl D. Gordon, Petia Yanchulova Merica-Jones, Geoffrey C. Clayton, Ralph Bohlin, Marjorie Decleir, Claire E. Murray, Luciana Bianchi   +6 more
doaj   +1 more source

Unexplored Mechanisms of Photoprotection: Synergistic Light Absorption and Antioxidant Activity of Melanin

Antioxidants
Light exposure has relevant effects both on living organisms and artificial materials. In particular, ultraviolet radiation is known to kill living cells and damage human skin but also degrade important artificial materials like plastics.
Arianna Menichetti, Dario Mordini, Silvia Vicenzi, Agata Pane, Marco Montalti   +4 more
doaj   +1 more source

Rab1A Promotes Hepatic Steatosis by Suppressing Mitophagy via the Raf‐1/ERK1/2/PINK1 Signaling Axis

Advanced Science, EarlyView.
Why does fat accumulate in the liver? Our study reveals Rab1A as the molecular switch that silences the cell's mitochondrial cleanup crew. Turning Rab1A off reactivates mitophagy, clears excess fat, and reverses fatty liver disease in mice—offering a promising new therapeutic target for MASLD, a growing global health challenge.
Li Zhang, Jianhua Li, Huilu Zhang, Qi Qin, Yichen Huang, Xiaofan Tian, Chao Sun, Binbin Li, Zhengxin Wang, Xin Zhang   +9 more
wiley   +1 more source

Extinction of Taurus, Orion, Perseus and California Molecular Clouds Based on the LAMOST, 2MASS, and Gaia Surveys. II. The Extinction Law

The Astronomical Journal
The extinction law from ultraviolet (UV) to infrared (IR; 0.2–24 μ m) is determined by relying on the blue-edge method and color-excess ratios for some nearby molecular clouds, from the low-mass star-forming region to the massive star-forming region. The
ZheTai Cao, Biwei Jiang, Shu Wang, Jun Li   +3 more
doaj   +1 more source

Fear conditioning- and extinction-induced neuronal plasticity in the mouse amygdala [PDF]

, 2009
Experience-dependent changes in behavior are mediated by long-term functional modifications in brain circuits. To study the underlying mechanisms, our lab is using classical auditory fear conditioning, a simple and robust form of associative learning. In
Ciocchi, Stéphane
core   +1 more source