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Serological and molecular approaches for distinguishing bean common mosaic and bean common mosaic necrosis potyviruses and their respective pathogroupsXu, Ling, 1963- 30 June 1995 (has links)
Polyclonal antisera were raised against isolates of bean
common mosaic virus (BCMV) and bean common mosaic necrosis
virus (BCMNV) using conventional serological methods.
Infected tissues containing, respectively, 22 recognized BCMV
and BCMNV isolates were tested against the two antisera by
antigen-coated plate (ACP) ELISA and double antibody sandwich
(DAS) ELISA. Results indicated that each immunoglobulin was
virus-specific by DAS-ELISA, providing clear distinction
between BCMV and BCMNV.
A reverse transcription, polymerase chain reaction (RT-PCR)-based assay in combination with restriction endonuclease
analyses, was developed for molecular detection of BCMV, BCMNV
and their pathogroups. Specific detection of the two viruses
was accomplished by constructing two virus-specific primer
pairs that amplified a PCR product specific for each virus.
Distinction of two BCMNV pathogroups (PG-III and PG-VI) was
achieved by restriction enzyme XbaI digestion of BCMNV PCR
products. However, none of the tested restriction enzymes
clearly differentiated the five recognized BCMV pathogroups.
A primer pair Dts/Uny15 specific for BCMV pathogroup V was
also developed. By its RT-PCR application, four BCMV-PG-V
isolates were differentiated from the other known variants of
BCMV pathogroup I, II, IV and VII. Thus, by a combination of
RT-PCR and restriction enzyme analyses, it was possible to
differentiate both viruses, and two pathogroups of BCMNV, and
one pathogroup of BCMV. / Graduation date: 1996
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Real-time Mosaic for Multi-Camera VideoconferencingKlechenov, Anton, Gupta, Aditya Kumar, Wong, Weng Fai, Ng, Teck Khim, Leow, Wee Kheng 01 1900 (has links)
This paper describes a system for high resolution video conferencing. A number of camcorders are used to capture the video, which are then mosaiced to generate a wide angle panoramic view. Furthermore this system is made “real-time” by detecting changes and updating them on the mosaic. This system can be deployed on a single machine or on a cluster for better performance. It is also scalable and shows a good real-time performance. The main application for this system is videoconferencing for distance learning but it can be used for any high resolution broadcasting. / Singapore-MIT Alliance (SMA)
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Accurate and discernible photocollagesMiller, Jordan William 09 March 2010
There currently exist several techniques for selecting and combining images from a digital image library into a single image so that the result meets certain prespecified visual criteria. Image mosaic methods, first explored by Connors and Trivedi[18], arrange library images according to some tiling arrangement, often a regular grid, so that the combination of images, when viewed as a whole, resembles some input target image. Other techniques, such as Autocollage of Rother et al.[78], seek only to combine images in an interesting and visually pleasing manner, according to certain composition principles, without attempting to approximate any target image. Each of these techniques provide a myriad of creative options for artists who wish to combine several levels of meaning into a single image or who wish to exploit the meaning and symbolism contained in each of a large set of images through an efficient and easy process.
We first examine the most notable and successful of these methods, and summarize the advantages
and limitations of each. We then formulate a set of goals for an image collage system that combines the advantages of these methods while addressing and mitigating the drawbacks.
Particularly, we propose a system for creating photocollages that approximate a target image as
an aggregation of smaller images, chosen from a large library, so that interesting visual correspondences between images are exploited. In this way, we allow users to create collages in which multiple layers of meaning are encoded, with meaningful visual links between each layer. In service of this goal, we ensure that the images used are as large as possible and are combined in such a way that boundaries between images are not immediately apparent, as in Autocollage. This has required us to apply a multiscale approach to searching and comparing images from a large database, which achieves both speed and accuracy. We also propose a new framework for color post-processing, and
propose novel techniques for decomposing images according to object and texture information.
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Accurate and discernible photocollagesMiller, Jordan William 09 March 2010 (has links)
There currently exist several techniques for selecting and combining images from a digital image library into a single image so that the result meets certain prespecified visual criteria. Image mosaic methods, first explored by Connors and Trivedi[18], arrange library images according to some tiling arrangement, often a regular grid, so that the combination of images, when viewed as a whole, resembles some input target image. Other techniques, such as Autocollage of Rother et al.[78], seek only to combine images in an interesting and visually pleasing manner, according to certain composition principles, without attempting to approximate any target image. Each of these techniques provide a myriad of creative options for artists who wish to combine several levels of meaning into a single image or who wish to exploit the meaning and symbolism contained in each of a large set of images through an efficient and easy process.
We first examine the most notable and successful of these methods, and summarize the advantages
and limitations of each. We then formulate a set of goals for an image collage system that combines the advantages of these methods while addressing and mitigating the drawbacks.
Particularly, we propose a system for creating photocollages that approximate a target image as
an aggregation of smaller images, chosen from a large library, so that interesting visual correspondences between images are exploited. In this way, we allow users to create collages in which multiple layers of meaning are encoded, with meaningful visual links between each layer. In service of this goal, we ensure that the images used are as large as possible and are combined in such a way that boundaries between images are not immediately apparent, as in Autocollage. This has required us to apply a multiscale approach to searching and comparing images from a large database, which achieves both speed and accuracy. We also propose a new framework for color post-processing, and
propose novel techniques for decomposing images according to object and texture information.
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Vision Based Station-Keeping for the Unmanned Underwater VehicleLee, Chen-wei 01 August 2008 (has links)
Station-Keeping is an important capability of the Unmanned Underwater Vehicle in a variety of mission , including inspection and repair of undersea pipeline , and surveillance . Station-Keeping control includes two parts : motion estimation and Station-Keeping control system . In this thesis we propose a monocular vision system for determining the motion of an Unmanned Underwater Vehicle . The vehicle is equipped with a down-looking camera , which provides images of the sea-floor . The motion of vehicle is estimated with a feature-based mosaicking method which requires the extraction and the matching of relevant features . We designed a visual servo control system for maintaining the position of vehicle relative to a visual landmark , while maintaining a fixed depth .
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Effect of depurination on the replication of brome mosaic virus RNA3 /Karran, Rajita Abhimanu. January 2008 (has links)
Thesis (M.Sc.)--York University, 2008. Graduate Programme in Biology. / Typescript. Includes bibliographical references (leaves 94-99). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR38791
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INTERACTION OF TOBACCO MOSAIC VIRUS AND ITS PROTEIN SUBUNIT WITH RABBIT ALVEOLAR MACROPHAGESThompson, Sue Howle, 1922- January 1971 (has links)
No description available.
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The effect of diazomethane on tobacco mosaic virus ribonucleic acidJaworski, Alan January 1966 (has links)
No description available.
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Disc electrophoresis studies of healthy and tobacco mosaic virus infected Nicotiana tabacum L. plantsMitchell, Dawn Masunaga, 1942- January 1967 (has links)
No description available.
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Continuous Extrusion of Homogeneous and Heterogeneous Hydrogel TubesMcAllister, Arianna 19 March 2014 (has links)
We present a platform that allows homogeneous and heterogeneous 3-D soft materials to be continuously defined in a single step. Biopolymer solutions are introduced to a microfluidic device and radially distributed to feed to a common outlet at the device center. This forms concentric sheaths of complex fluids and upon crosslinking, a hydrogel tube at the exit. This approach allows for the controlled and continuous extrusion of tubes with tailored diameters of 500 μm to 1500 μm, wall thicknesses of 20 μm to 120 μm, and compositions, as well as predictable mechanical and chemical properties. Using the same platform, single and multi-walled hydrogel tubes with defined heterogeneities and patterns of discrete spots of secondary biopolymer materials can be continuously extruded. A tube-hosting device is presented which can independently perfuse and superfuse isolated tube segments, allowing precise microenvironmental control without cannulation for up to an hour.
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