Results 61 to 70 of about 195,388 (199)

The Infrared Extinction Law at Extreme Depth in a Dark Cloud Core

, 2007
We combined sensitive near-infrared data obtained with ground-based imagers on the ESO NTT and VLT telescopes with space mid-infrared data acquired with the IRAC imager on the Spitzer Space Telescope to calculate the extinction law A_\lambda/A_K as a ...
August Muench, Bertoldi F., Carlos G. Roman‐Zuniga, Charles J. Lada, Joao F. Alves, Lutz D., Rosenthal D.   +6 more
core   +1 more source

Influence of Stress Severity on Contextual Fear Extinction and Avoidance in a Posttraumatic-like Mouse Model

Brain Sciences
Posttraumatic stress disorder (PTSD) is a widespread fear-related psychiatric affection associated with fear extinction impairments and important avoidance behaviors.
Noémie Eyraud, Solal Bloch, Bruno Brizard, Laurane Pena, Antoine Tharsis, Alexandre Surget, Wissam El-Hage, Catherine Belzung   +7 more
doaj   +1 more source

Extinction Curves, Distances, and Clumpiness of Diffuse Interstellar Dust Clouds [PDF]

, 1999
We present CCD photometry in UBVRI of several thousand Galactic field stars in four large (>1 degree^2) regions centered on diffuse interstellar dust clouds, commonly referred to as ``cirrus'' clouds (with optical depth A_V less than unity).
Arpad Szomoru, Bertelli G., Bowen D. V., Casertano S., de Vaucouleurs G., de Vaucouleurs G., de Vries C. P., Heiles C., Kiszkurno-Koziej E., Magnani L., Mathis J. S., Puragra Guhathakurta, Stark R., Whittet D. C. B., Wolf M.   +14 more
core   +2 more sources

UV Opacity in Nearby Galaxies and Application to Distant Galaxies [PDF]

, 1997
The effects of dust opacity on the radiation of nearby and distant galaxies are reviewed. The geometrical distribution of the dust inside the galaxy plays a fundamental role in determining the wavelength dependence of the obscuration and the opacity of ...
Calzetti, Daniela
core   +2 more sources

The Optical Gravitational Lensing Experiment. Is Interstellar Extinction Toward the Galactic Center Anomalous?

, 2002
Photometry of the Galactic bulge, collected during the OGLE-II microlensing search, indicates high and non-uniform interstellar extinction toward the observed fields.
A. Udalski, Mizerski T., Ortolani S., Paczynski B., Paczynski B., Schultheis M., Stanek K. Z., Udalski A., Udalski A.   +8 more
core   +1 more source

Polygenic altruism and extinction group selection.

The Japanese Journal of Genetics, 1982
Conditions are derived for altruism to evolve by the differential extinction of groups. The altruism is assumed to be determined by many loosely linked genes, acting additively within and between loci, and an independent environmental component.
openaire   +2 more sources

Sexual selection and the risk of extinction in birds [PDF]

Proceedings of the Royal Society of London. Series B: Biological Sciences, 2003
The relationship between sexual selection and extinction risk has rarely been investigated. This is unfortunate because extinction plays a key role in determining the patterns of species richness seen in extant clades, which form the basis of comparative studies into the role that sexual selection may play in promoting speciation.
Edward H, Morrow, Trevor E, Pitcher
openaire   +2 more sources

Effects of Noradrenergic Stimulation Upon Context-Related Extinction Learning Performance and BOLD Activation in Hippocampus and Prefrontal Cortex Differ Between Participants Showing and Not Showing Renewal

Frontiers in Behavioral Neuroscience, 2019
While the neural structures mediating context-related renewal of extinction are well established, the neurotransmitter systems processing renewal remain elusive.
Silke Lissek, Anne Klass, Martin Tegenthoff   +2 more
doaj   +1 more source

Sexual selection and the risk of extinction in mammals [PDF]

Proceedings of the Royal Society of London. Series B: Biological Sciences, 2004
(Uploaded by Plazi for the Bat Literature Project) No abstract provided.
Edward H, Morrow, Claudia, Fricke
openaire   +2 more sources

Accelerated habit formation following amphetamine exposure is reversed by D1, but enhanced by D2, receptor antagonists

Frontiers in Neuroscience, 2013
Repeated exposure to the psychostimulant amphetamine has been shown to disrupt goal-directed instrumental actions and promote the early and abnormal development of goal-insensitive habitual responding (Nelson and Killcross, 2006).
Andrew John Dudley Nelson, Simon eKillcross   +1 more
doaj   +1 more source