Results 61 to 70 of about 8,469,152 (382)

Contrast Sensitivity of the Motion System

Vision Research, 1996
A number of experiments were conducted to investigate how global-motion performance varies with luminance contrast. When all the dots in the stimulus were the same contrast, performance improved with increasing contrast up to about the 15% level (Experiment 1). Increasing the contrast beyond this level had no additional effect on performance.
Mark Edwards, Shin'ya Nishida, David R. Badcock   +2 more
openaire   +3 more sources

The unpredictably eruptive dynamics of spruce budworm populations in eastern Canada

Population Ecology, EarlyView.
We examine historical population data for spruce budworm from several locations through the period 1930–1997, and use density‐dependent recruitment curves to test whether the pattern of population growth over time is more consistent with Royama's (1984; Ecological Monographs 54:429–462) linear R(t) model of harmonic oscillation at Green River New ...
Barry J. Cooke, Jacques Régnière
wiley   +1 more source

The Evaluation of Yellow vs. Blue Color Contrast Sensitivity pre and Post LASIK [PDF]

Iranian Journal of Medical Physics, 2007
Introduction: contrast sensitivity is one of the most important psychophysical tests that may be used for the evaluation of refractive state of eye and retinal image quality. Yellow vs. blue color contrast sensitivity may be more suitable in this regard.
S. Heydarian, , M. Jabarvand Behrooz, E. Jafarzadehpour, R. Vahabbi   +3 more
doaj   +1 more source

Systematic review and meta-analysis of the diagnostic accuracy of ultrasonography for deep vein thrombosis [PDF]

, 2005
Background Ultrasound (US) has largely replaced contrast venography as the definitive diagnostic test for deep vein thrombosis (DVT). We aimed to derive a definitive estimate of the diagnostic accuracy of US for clinically suspected DVT and identify ...
A Cogo, A Cogo, A Elias, A Elias, A Gongolo, A Markel, A Miselli, AF Aburahma, AG Aitken, AJ Comerota, AJ Comerota, AJ Sutton, Alex Sutton, AT Irvine, AW Lensing, B Kassai, B van Ramshorst, B Wolf, BD Lewis, BG Birdwell, BG Birdwell, BN Raghavendra, BS Hwang, C Kearon, C Savy-Stortz, D Becker, D Cavaye, D Gaitini, DA Kristo, DC Mitchell, DH O'Leary, DL Rollins, DP Flanigan, DR Anderson, E Bernardi, E Kalodiki, Edwin van Beek, EK Yucel, F Dany, F Pasquariello, FC Sampson, Fiona Sampson, FJ Song, G Guazzaloca, GJ Zhang, GM Baxter, GM Baxter, GP Shields, GP Size, GR Simons, GV Belcaro, H Bounameaux, H Heijboer, H Heijboer, H Rosier, HJ Aronen, HO Leven, I Baumgartner, J De Laveaucoupet, J Howe, J Yao, J Zamora, JC De Valois, JE George, JE George, JF Chance, JG Lijmer, JJ Cranley, JJ Cronan, JJ Deeks, JM Schindler, JP Carpenter, JP Fletcher, JP Laissy, JPJ Archie, JS Ginsberg, K Forbes, K Ouriel, K Walsh, LA Killewich, LW Tick, M Atri, M Dauzat, M Grobety, M Hay, M Mantoni, M Monreal, M Sluzewski, MA Amin, MA Mattos, MCG Holmes, ME McCandless, MJ Bradley, MK Eskandari, MK Zhou, N Labropoulos, N Miller, NH Rosner, OM Pedersen, P De Faucal, P Vogel, PJ Bendick, PL Robertson, PL Robertson, PR Biondetti, PS Wells, PS Wells, PS Wells, PS Wells, PS Wells, PT Appelman, PT Kennedy, R Lindqvist, R Mani, R Poti, R Puls, R Quintavalla, RA Bucek, RA Kraaijenhagen, RB Patterson, SC Rose, SG Thompson, SJ Theodorou, SM Bates, SM Schellong, SM Stevens, Steve Goodacre, Steve Thomas, SW Heim, TE Gudmundsen, TL Turnbull, W Habscheid, W Wysokinski, WD Foley   +133 more
core   +5 more sources

Between Droughts and Floods: The Seasonal Response of Freshwater Snails in Artificial Reservoirs in the Brazilian Semiarid Region

Population Ecology, EarlyView.
We investigate the seasonal dynamics of two freshwater snails, Biomphalaria straminea and Melanoides tuberculata, in artificial reservoirs of the Brazilian semiarid region. Despite regulated hydrology, B. straminea exhibited strong seasonal fluctuations associated with dry periods, while M. tuberculata maintained stable populations throughout the year,
Lucas Henrique Sousa da Silva, João Hemerson de Sousa, Adriana Josefa da Rocha, Manuella Feitosa Leal, Lucas Ariel de Sousa Aguiar, Tamaris Gimenez Pinheiro, Edson Lourenço da Silva   +6 more
wiley   +1 more source

Contrast Enhancement Using Sensitivity Model-Based Sigmoid Function

IEEE Access, 2019
For indirect contrast enhancement, researchers have proposed various transformation functions based on histogram equalization and gamma correction.
Seung Park, Yong-Goo Shin, Sung-Jea Ko
doaj   +1 more source

Magnetic Domain Structure of La0.7Sr0.3MnO3 thin-films probed at variable temperature with Scanning Electron Microscopy with Polarization Analysis [PDF]

, 2013
The domain configuration of 50 nm thick La0.7SrMnO3 films has been directly investigated using scanning electron microscopy with polarization analysis (SEMPA), with magnetic contrast obtained without the requirement for prior surface preparation.
Foerster, Michael, Jakob, Gerhard, Kläui, Mathias, König, Markus, Mix, Christian, Reeve, Robert M.   +5 more
core   +2 more sources

Contrast sensitivity revealed by microsaccades.

Journal of Vision, 2015
Microsaccades are small rapid and involuntary eye movements that occur during fixation in an apparently stochastic manner. They are known to be inhibited in response to sensory transients, with a time course that depends on the stimulus parameters and ...
Y. Bonneh, Y. Adini, U. Polat
semanticscholar   +1 more source

FoxO1 signaling in B cell malignancies and its therapeutic targeting

FEBS Letters, EarlyView.
FoxO1 has context‐specific tumor suppressor or oncogenic character in myeloid and B cell malignancies. This includes tumor‐promoting properties such as stemness maintenance and DNA damage tolerance in acute leukemias, or regulation of cell proliferation and survival, or migration in mature B cell malignancies.
Krystof Hlavac, Petra Pavelkova, Laura Ondrisova, Marek Mraz   +3 more
wiley   +1 more source

Making tau amyloid models in vitro: a crucial and underestimated challenge

FEBS Letters, EarlyView.
This review highlights the challenges of producing in vitro amyloid assemblies of the tau protein. We review how accurately the existing protocols mimic tau deposits found in the brain of patients affected with tauopathies. We discuss the important properties that should be considered when forming amyloids and the benchmarks that should be used to ...
Julien Broc, Clara Piersson, Yann Fichou
wiley   +1 more source