Results 21 to 30 of about 195,388 (199)

The tree balance signature of mass extinction is erased by continued evolution in clades of constrained size with trait-dependent speciation.

PLoS ONE, 2017
The kind and duration of phylogenetic topological "signatures" left in the wake of macroevolutionary events remain poorly understood. To this end, we examined a broad range of simulated phylogenies generated using trait-biased, heritable speciation ...
Guan-Dong Yang, Paul-Michael Agapow, Gabriel Yedid   +2 more
doaj   +1 more source

Peroxisome proliferator-activated receptor-α activation facilitates contextual fear extinction and modulates intrinsic excitability of dentate gyrus neurons

Translational Psychiatry, 2023
The dentate gyrus (DG) of the hippocampus encodes contextual information associated with fear, and cell activity in the DG is required for acquisition and extinction of contextual fear.
Guo Xiang, Xia Liu, Jiangong Wang, Shunshun Lu, Meng Yu, Yuhan Zhang, Bin Sun, Bin Huang, Xin-Yun Lu, Xingang Li, Di Zhang   +10 more
doaj   +1 more source

A global ecological signal of extinction risk in marine ray-finned fishes (class Actinopterygii)

Cambridge Prisms: Extinction, 2023
Many marine fish species are experiencing population declines, but their extinction risk profiles are largely understudied in comparison to their terrestrial vertebrate counterparts.
Trevor M. Bak, Richard J. Camp, Noel A. Heim, Douglas J. McCauley, Jonathan L. Payne, Matthew L. Knope   +5 more
doaj   +1 more source

Ultrahigh Extinction Ratio Long‐Wave Infrared Polarization‐Selective Broadband Metamaterial Absorber

Advanced Photonics Research, 2023
Metamaterial absorbers (MAs) provide new miniaturization, integration, and high‐performance solution for infrared polarization imaging systems.
Zheng Qin, Zhongzhu Liang, Xiaoyan Shi, Dejia Meng, Rui Dai, Chunfang Sun, Wei Xin, Fuming Yang, Yingzheng Ren, Jiajing Feng   +9 more
doaj   +1 more source

Interstellar Extinction Law toward the Galactic Center II: V, J, H, and Ks Bands [PDF]

, 2008
We have determined the ratios of total to selective extinction directly from observations in the optical V band and near-infrared J band toward the Galactic center.
Hirofumi Hatano, Koji Sugitani, Motohide Tamura, Ryo Kandori, Shogo Nishiyama, Shuji Sato, Tetsuya Nagata, Udalski A.   +7 more
core   +1 more source

Selective Extinction through Cognitive Evaluation: Linking Emotion Regulation and Extinction

European Journal of Neuroscience, 2018
It has been proposed that the extinction of conditioned fear and the instructed regulation of emotion engage common ventromedial prefrontal (vmPFC) circuitry, indicating common underlying processes. Here we report an fMRI study using a novel task designed to investigate the neural overlap between cognitive emotion regulation and extinction of ...
Macdonald, Birthe, Wake, Shannon, Johnstone, Tom   +2 more
openaire   +6 more sources

High-extinction-ratio TE/TM selective Bragg grating filters on silicon-on-insulator [PDF]

, 2016
We report on the design and fabrication of TE and TM polarization selective Bragg grating filters in the form of sinusoidal perturbations on the waveguide sidewall and etched holes on the top of the waveguide, respectively.
Klitis, Charalambos, Cantarella, Giuseppe, Strain, Michael J., Sorel, Marc   +3 more
core   +13 more sources

No mass extinction for land plants at the Permian–Triassic transition

Nature Communications, 2019
It has been thought that land plants suffered a mass extinction along with animals at the end of the Permian. Here, Nowak et al. show that the apparent plant mass extinction is a result of biases in the fossil record and their reanalysis suggests a lower
Hendrik Nowak, Elke Schneebeli-Hermann, Evelyn Kustatscher   +2 more
doaj   +1 more source

The peculiar extinction law of SN2014J measured with The Hubble Space Telescope [PDF]

, 2014
The wavelength-dependence of the extinction of Type Ia SN2014J in the nearby galaxy M82 has been measured using UV to near-IR photometry obtained with the Hubble Space Telescope, the Nordic Optical Telescope, and the Mount Abu Infrared Telescope. This is
Amanullah, R., Ashok, N. M., Banerjee, D. P. K., Cao, Y., Goobar, A., Johansson, J., Joshi, V., Kasliwal, M. M., Kulkarni, S. R., Nugent, P. E., Petrushevska, T., Stanishev, V., Venkataraman, V.   +12 more
core   +4 more sources

Systemic Cellular Activation Mapping of an Extinction-Impaired Animal Model

Frontiers in Cellular Neuroscience, 2019
Fear extinction diminishes conditioned fear responses and impaired fear extinction has been reported to be related to anxiety disorders such as post-traumatic stress disorder (PTSD).
Kwanghoon Park, ChiHye Chung
doaj   +1 more source