Results 81 to 90 of about 1,974,870 (293)

Spatial and spatial‐frequency analysis in visual optics [PDF]

open access: yesOphthalmic and Physiological Optics, 2012
Citation information: Westheimer G. Spatial and spatial‐frequency analysis in visual optics. Ophthalmic Physiol Opt 2012, 32, 271–281. doi: 10.1111/j.1475‐1313.2012.00913.xAbstractBackground:  In the specification of visual targets and their transmission through the eye’s optics to form retinal images, the spatial distribution of energy and its Fourier
openaire   +3 more sources

Organizing the interface—Plasma membrane architecture and receptor dynamics in virus‐cell interactions

open access: yesFEBS Letters, EarlyView.
Plasma membranes contain dynamic nanoscale domains that organize lipids and receptors. Because viruses operate at similar scales, this architecture shapes early infection steps, including attachment, receptor engagement, and entry. Using influenza A virus and HIV‐1 as examples, we highlight how receptor nanoclusters, multivalent glycan interactions ...
Jan Schlegel, Christian Sieben
wiley   +1 more source

Complications and management in Descemet′s stripping endothelial keratoplasty: Analysis of consecutive 430 cases

open access: yesIndian Journal of Ophthalmology, 2014
Purpose: To analyze the complications and their managements in Descemet′s stripping endothelial keratoplasty (DSEK) in consecutive 430 cases by single surgeon in a tertiary eye hospital.
Samar K Basak, Soham Basak
doaj   +1 more source

Analysis of terahertz generation using tilted-pulse-fronts

open access: yes, 2018
A 2-D spatio-temporal analysis of terahertz generation by optical rectification of tilted-pulse-fronts is presented. Closed form expressions of terahertz transients and spectra in two spatial dimensions are furnished in the undepleted limit. Importantly,
Kärtner, Franz X., Ravi, Koustuban
core   +2 more sources

AAA+ protein unfoldases—the Moirai of the proteome

open access: yesFEBS Letters, EarlyView.
AAA+ unfoldases are essential molecular motors that power protein degradation and disaggregation. This review integrates recent cryo‐electron microscopy (cryo‐EM) structures and single‐molecule biophysical data to reconcile competing models of substrate translocation.
Stavros Azinas, Marta Carroni
wiley   +1 more source

The Influence of Face Inversion and Spatial Frequency on the Self-Positive Expression Processing Advantage

open access: yesFrontiers in Psychology, 2018
Previous research has examined the impact of late self-evaluation, ignoring the impact of the early visual coding stage and the extraction of facial identity information and expression information on the self-positive expression processing advantage ...
Yueyang Yin   +3 more
doaj   +1 more source

Object spatial frequencies, retinal spatial frequencies, noise, and the efficiency of letter discrimination

open access: yesVision Research, 1991
To determine which spatial frequencies are most effective for letter identification, and whether this is because letters are objectively more discriminable in these frequency bands or because can utilize the information more efficiently, we studied the 26 upper-case letters of English. Six two-octave wide filters were used to produce spatially filtered
D H, Parish, G, Sperling
openaire   +2 more sources

Transcriptional network analysis of PTEN‐protein‐deficient prostate tumors reveals robust stromal reprogramming and signs of senescent paracrine communication

open access: yesMolecular Oncology, EarlyView.
Combining PTEN protein assessment and transcriptomic profiling of prostate tumors, we uncovered a network enriched in senescence and extracellular matrix (ECM) programs associated with PTEN loss and conserved in a mouse model. We show that PTEN‐deficient cells trigger paracrine remodeling of the surrounding stroma and this information could help ...
Ivana Rondon‐Lorefice   +16 more
wiley   +1 more source

From the Heart to the Mind: Cardiac Vagal Tone Modulates Top-down and Bottom-up Visual Perception and Attention to Emotional Stimuli

open access: yesFrontiers in Psychology, 2014
The neurovisceral integration model (Thayer & Lane, 2000) posits that cardiac vagal tone, indexed by heart rate variability (HRV), can indicate the functional integrity of the neural networks implicated in emotion-cognition interactions.
Gewnhi ePark, Julian F. Thayer
doaj   +1 more source

Microscopic Analysis of Low-Frequency Flux Noise in YBa$_2$Cu$_3$O$_7$ Direct Current Superconducting Quantum Interference Devices

open access: yes, 2004
We use low-temperature scanning electron microscopy combined with SQUID detection of magnetic flux to image vortices and to investigate low-frequency flux noise in YBa$_2$Cu$_3$O$_7$ thin film SQUIDs.
Doenitz, D.   +3 more
core   +1 more source

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