Results 251 to 260 of about 1,051,604 (281)

Extended analysis of curvature sensing

Journal of the Optical Society of America A, 2002
Curvature sensors are used in adaptive optics to measure the wave-front aberrations. In practice, their performance is limited by their nonlinear behavior, which we characterize by solving simultaneously the irradiance transport equation and the accompanying wave-front transport equation. We show how the presence of nonlinear geometric terms limits the
Marcos A, van Dam, Richard G, Lane
openaire   +2 more sources

Curvature Sensing: A New Wavefront Sensing Method

SPIE Proceedings, 1988
A new wavefront sensing method based on local wavefront curvature measurements rather than tilt measurements is investigated. Performances are compared to that of a Shack-Hartmann sensor. Examples of experimentally reconstructed wavefronts are presented and several applications are discussed.
Francois Roddier, Claude Roddier, Nicolas Roddier   +2 more
openaire   +1 more source

Analysis of curvature sensing for VISTA

SPIE Proceedings, 2003
VISTA is the Visible and Infrared Survey Telescope for Astronomy that has been designed by the UK ATC. The design incorporates two cameras covering the visible and near-IR wavelengths. The 4-m primary mirror has an active support system with 84 axial actuators that is used, in conjunction with the 5-axis support system for the 1.2-m secondary mirror ...
Brett A. Patterson, Will J. Sutherland
openaire   +1 more source

Protein–membrane interactions: sensing and generating curvature

Trends in Biochemical Sciences
Biological membranes are integral cellular structures that can be curved into various geometries. These curved structures are abundant in cells as they are essential for various physiological processes. However, curved membranes are inherently unstable, especially on nanometer length scales.
Wade F Zeno, Orianna H Kou, Nicoletta Bouzos   +2 more
exaly   +3 more sources

Mechanisms of Membrane Curvature Sensing

Annual Review of Biochemistry, 2011
Bacteria and eukaryotic cells contain geometry-sensing tools in their cytosol: protein motifs or domains that recognize the curvature, concave or convex, deep or shallow, of lipid membranes. These sensors contrast with classical lipid-binding domains by their extended structure and, sometimes, counterintuitive chemistry.
openaire   +2 more sources

Role of boundary measurements in curvature sensing

Optics Communications, 1999
The role of boundary measurements in curvature sensing is analyzed in basis of the method of weighting functions. It is shown that depending on the orthogonal basis chosen to expand the wavefront some modes can be exactly restored from the curvature data only, without the boundary information.
Susana Ríos
exaly   +2 more sources

A kinetic basis for curvature sensing by septins

2022
The ability of cells to sense and communicate their shape is central to many of their functions. Much is known about how cells generate complex shapes, yet how they sense and respond to geometric cues remains poorly understood. Septins are GTP-binding proteins that localize to sites of micron-scale membrane curvature.
Wenzheng Shi, Kevin S. Cannon, Brandy N. Curtis, Christopher Edelmaier, Amy S. Gladfelter, Ehssan Nazockdast   +5 more
openaire   +1 more source

Experimental limits on curvature sensing

SPIE Proceedings, 1999
While developing deformable mirrors for adaptive optics, and while studying scintillations, we also tested the method of curvature sensing and different variants of it. By very carefully adjusting the optics we were able to discern variations on the scale of one nanometer.
openaire   +1 more source

Computational Design of Membrane Curvature-Sensing Peptides

2016
Computer simulations have become an indispensable tool in studying molecular biological systems. The unmatched spatial and temporal resolution that it offers enables for microscopic-level views into the dynamics and mechanics of biological systems. Recent advances in hardware resources have also opened up to computer simulations the investigation of ...
Armando Jerome, de Jesus, Hang, Yin
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Bimorph adaptive mirrors and curvature sensing

Journal of the Optical Society of America A, 1994
The applicability of wave-front correction by means of a bimorph mirror in conjunction with a curvature sensor is described. We use Zernike polynomials to describe the quality of the atmospheric-turbulence correction analytically. The match is limited by boundary conditions of the mirror and by the discreteness of the electrodes.
C. Schwartz, E. Ribak, S. G. Lipson
openaire   +1 more source