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Thursday, April 23, 2020 | History

3 edition of Optical logarithmic transformation of speckle images with bacteriorhodopsin films found in the catalog.

Optical logarithmic transformation of speckle images with bacteriorhodopsin films

Optical logarithmic transformation of speckle images with bacteriorhodopsin films

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  • 8 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C, Springfield, Va .
Written in English

    Subjects:
  • Logarithms.,
  • Image processing.,
  • Photochromism.,
  • Light modulation.

  • Edition Notes

    StatementJohn D. Downie.
    SeriesNASA-TM -- 111971., NASA technical memorandum -- 111971.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15501905M

    When a laser beam is reflected from a diffuse surface, a granular scattering distribution is commonly observed, called a speckle pattern. The author discusses some of its ramifications: (1) that this pattern is the time- dependent analogue of the signal used in the classic Hanbury Brown - Twiss stellar interferometer of the 's; (2) that this pattern can be processed by standard . The direct deposit of photoelectric materials onto low-cost prefabricated patterned flexible electrodes provided by the present invention introduces a new design approach that permits the development of innovative lightweight, durable and non-planar sensing systems. By extending single and multi-spectral bioelectronic sensing technology to flexible plastic substrates, the Cited by: Photolithography based patterning of bacteriorhodopsin films Christopher M. Anton Recommended Citation Anton, Christopher M., "Photolithography based patterning of bacteriorhodopsin films", Dissertation, Michigan Technological University, Optical microscope images of PM film patterns Cited by: 2.


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Optical logarithmic transformation of speckle images with bacteriorhodopsin films Download PDF EPUB FB2

The application of logarithmic transformations to speckle images is sometimes desirable in converting the speckle noise distribution into an additive, constant-variance noise distribution.

The optical transmission properties of some bacteriorhodopsin films are well suited to implement such a transformation optically in a parallel fashion.

Get this from a library. Optical logarithmic transformation of speckle images with bacteriorhodopsin films. [John D Downie; United States. The application of logarithmic transformations to speckle images is sometimes desirable in converting the speckle noise distribution into an additive, constant-variance noise distribution.

The optical transmission properties of some bacteriorhodopsin films are well suited to implement such a transformation optically in a parallel by: 6. Optical set-up for logarithmic transformation of speckle image with BR film.

Shutter A is opened during the write process and shutter B is opened during the read process. Optical processing of speckle images with bacteriorhodopsin is closed, shutter B is opened and the beam transmitted through the BR film is imaged into a CCD by: 5.

The application of logarithmic transformations to speckle images is sometimes desirable in converting the speckle noise distribution into an additive, constant-variance noise distribution.

The optical transmission properties of some bacteriorhodopsin films are well suited to implement such a transformation optically in a parallel : John D. Downie. One particularly common form of multiplicative noise is speckle, for which the logarithmic operation not only produces additive noise, but also makes it of constant variance (signal-independent).

I examine the optical transmission properties of some bacteriorhodopsin films here and find them well suited to implement such a pointwise logarithmic transformation optically. We examine the optical transmission properties of some bacteriorhodopsin films here and find them well suited to implement such a pointwise logarithmic transformation optically in a parallel fashion.

We present experimental results of the optical conversion of speckle images into transformed images with additive, signal-independent noise statistics using the real-time photochromic properties of : John D. Downie and Deanne Tucker. Nonlinear Optical Image Processing with Bacteriorhodopsin Polymer Films Article in Molecular Crystals and Liquid Crystals (1) April with 10 Reads How we measure 'reads'.

Bacteriorhodopsin based films as a nanomemory (w/v) was illuminated by two orthogonal beams, green laser (vertical) and red laser (horizontal) for 30 minutes.

Fig. 1 shows the P state. Although there is no absorption peak before laser beam, however the absorption peak appears at nm after radiation.

The bacteriorhodopsin film studied here displays the logarithmic transmission response for write intensities spanning a dynamic range greater than 2 orders of magnitude. The transmission properties of some bacteriorhodopsin-film spatial light modulators are uniquely suited to allow nonlinear optical image-processing operations to be applied to images with multiplicative.

Organisms from bacteria to humans sense and react to light. Proteins that contain the light-sensitive molecule retinal couple absorption of light to conformational changes that produce a signal or move ions across a membrane.

Nogly et al. used an x-ray laser to probe the earliest structural changes to the retinal chromophore within microcrystals of the ion pump bacteriorhodopsin Cited by: Optical logarithmic transformation of speckle images with bacteriorhodopsin films of logarithmic transformations to speckle images is sometimes desirable in converting the speckle.

Photoinduced anisotropy in terms of dichroism and birefringence was investigated in a series of experiments. Measurements and comparisons were made using samples of wild type bacteriorhodopsin and its mutations 3,4-dehydro BR and 4-keto by: 4. Introduction.

Bacteriorhodopsin (bR) film possesses optimum properties, such as high photosensitivity, high photochemical and thermal stability, and the lifetime of M state prolonged for different has been used in various logic operations and image processing,, and one of extensive applications is photonic switches.Author: Guiying Y.

Chen, Guiying Y. Chen, Xin Liang, Yizhe Yuan, Guang Yang, Chunping Zhang, Tang Xu, Q. Function Edit. Bacteriorhodopsin is a light-driven proton pump.

It is the retinal molecule that changes its conformation when absorbing a photon, resulting in a conformational change of the surrounding protein and the proton pumping action. It is covalently linked to Lys in the chromophore by Schiff base action.

Optical Image Contrast Reversal Using Bacteriorhodopsin Films. Chinese Physics Letters22 (5), DOI: /X/22/5/ T. He, N. Friedman, D.

Cahen, M. Sheves. Bacteriorhodopsin Monolayers for Optoelectronics: Orientation and Photoelectric Response on Solid by:   The images were recorded on Kodak SO film at ×50,–60, magnification, and the electron-diffraction data were recorded with the film or with 1 k × 1 k and 2 k × 2 k slow-scan CCD Cited by: Nonlinear coherent optical image processing using logarithmic transmittance of bacteriorhodopsin films.

[John D Downie; United States. National Aeronautics and Space Administration.]. Photochrome transmembrane protein bacteriorhodopsin from 1. Journal of Medicine, Physiology and Biophysics An Open Access Journal, Vol. 4, Photochrome Transmembrane Protein Bacteriorhodopsin from Purple Membranes of Halobacterium Halobium in Nano- and Biotechnologies Oleg Mosin1 Ignat Ignatov2* 1.

Photoinduced Transformations in Bacteriorhodopsin Membrane Monitored with Optical Microcavities thin-film formation on solid surfaces has been widely studied in the context of fabrication.

4 M-state transformation. In the absence of the photoexcitation, M state relaxes. Capturing Light. Bacteriorhodopsin, shown here from PDB entry 1fbb, is composed of three protein chains. It is found embedded in dense arrays in the membranes of the bacteria. The area spanning the membrane is shown in the lower picture between the two green lines.

At the heart of each protein chain is a molecule of retinal. Objectives: Bacteriorhodopsin is a heptahelical membrane protein found in the archaean Halobacterium salinarum.

The performance of bacteriorhodopsin film was evaluated as a holographic optical memory. Material and method: Bacteriorhodopsin was immobilized on polymeric films with different weight/volume ratios of polyvinyl alcohol and gelatin. Such bacteriorhodopsin films have been studied as a potential material for information technology.

We built optical elements based on bacteriorhodopsin and measured their spectral properties. Here we describe a model of photoelectric response of the elements and compare it to the experimentally measured by: 2. Holographic particle image velocimetry (HPIV) offers potentially the best solution to volumetric measurements of the three-dimensional velocity fields in complex flows.

However, the traditional film-based HPIV measurement is rather cumbersome, limiting its use to only a handful of groups by: Digital image correlation and tracking is an optical method that employs tracking and image registration techniques for accurate 2D and 3D measurements of changes in images.

This method is often used to measure full-field displacement and strain s. Bacteriorhodopsin (BR) is a light transducing photochromic protein in the purple membrane of a salt-loving microorganism that inhabits salt marshes. It has strong absorption in a broad region of the visible : Serey Thai.

The photochromic property of bacteriorhodopsin films is exploited in the application of a focusing schlieren optical system for the visualization of optical phase information. By encoding an image on the film with light of one wavelength and reading out with a different wavelength, the readout beam can effectively see the photographic negative Cited by: The optical phenomenon known as speckle is well known and characterized for optically rough surfaces illuminated with coherent light.

Recently, speckle in OCT images was studied by Schmitt et al. His paper defines two types of speckle that appear in OCT images. The first is due to interference from multiply scattered photons.

A purple substance in the cell membranes of halobacteria (found in extremely saline environments) during conditions of low oxygen, and consisting of the protein bacteriopsin and retinal, the same carotenoid found in the visual pigments of animals; in response to light, the purple membrane pumps protons out of the cell, providing the energy gradient for synthesis of.

bacteriorhodopsin based film Bacteriorhodopsin imaging with Bruker Dimension FastScan and Peak Force Tapping - Duration: BrukerNano 4, views. Bacteriorhodopsin (BR), a model system in biotechnology, is a G-protein dependent trans membrane protein which serves as a light driven proton pump in the cell membrane of Halobacterium salinarum.

Due to the linkage of retinal to the protein, it seems colored and has numbers of versatile by: John D. Downie has written: 'Optical logarithmic transformation of speckle images with bacteriorhodopsin films' -- subject(s): Image processing, Light modulation, Logarithms, Photochromism.

All-optical switching characteristics in bacteriorhodopsin and its applications in integrated optics Yuhua Huang,1,2 Shin-Tson Wu1 and Youyuan Zhao3 1School of Optics/CREOL, University of Central Florida, Orlando, FloridaUSA 2Department of Physics, East China Normal University, Shanghai,China 3Department of Optics & Engineering, Fudan University.

Bacteriorhodopsin (BR) is a photochromic membrane protein isolated from a strain of halobacteria. Embedment of BR into a polymeric matrix enables the application of the photoactive protein as an optical material.

In this work, a chemically cross-linked BR/gelatin film was prepared. The cross-linked film was found to be highly stable even under extreme Cited by: Photoinduced transformation of F-bacteriorhodopsin gelatin films based on both wild type and D96N mutant.

Biosystems59 (1), DOI: /S(00) Sergei P. Balashov, Thomas G. by: Start studying Bacteriorhodopsin. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search. Create. Log in Sign up. Log in Sign up. 10 terms. azncaliroll. Bacteriorhodopsin. STUDY. PLAY. What is the structure of Bacteriorhodopsin?-Made of 7 TM a-helices in a knob-in-hole motif.

Bacteriorhodopsin is a trans-membrane protein found in the cellular membrane of Halobacterium salinarium, which functions as a light-driven proton the recent determination of the structure of bR by electron cryo-microscopy [1], simulation of the proton pump cycle has become feasible.

Subfs pump and probe pulses (– nm) were generated by non-collinear optical parametric amplification 5,6. The positive Δ T / T observed at wavelengths shorter than nm is due to the.

Bacteriorhodopsin is a kD transmembrane protein that packs so densely in the membrane that it naturally forms a two-dimensional crystal in the plane of the membrane. The structure of bR has been elucidated by image enhancement analysis of electron microscopic data, which reveals seven transmembrane helical protein segments.

Although numerous work with regard to multi-channel speckle filtering in SAR images had already being done in a remote past, the introduction of A Priori knowledge or A Priori guess which implies the use of Bayesian methods in the processing of multi-SAR’s images, multi-date SAR images or SAR and optical images began only in Cited by: 2.

Define bacteriorhodopsin. bacteriorhodopsin synonyms, bacteriorhodopsin pronunciation, bacteriorhodopsin translation, English dictionary definition of bacteriorhodopsin. n. A pigmented membrane protein found in extremely halophilic archaea of the genus Halobacterium that converts light energy to chemical energy and is.This paper introduces an approach that uses bacteriorhodopsin (BR) film as an intermediate information buffer to store the holographic information for further digital processing.

In particular, BR is a real-time recording medium with an information capacity ( line-pairs/mm) that even exceeds high-resolution photographic film.An international conference on Optics in Biomedical Sciences was organized and took place in Graz, Austria, September 7th through 11th,sponsored by the International Commission for Optics (ICO) in co­ operation with the European Optical Committee, the Austrian Association on Biomedical Engineering, and the German Society for Applied Optics.