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  • Electronic Resource  (3)
  • 1995-1999  (2)
  • 1970-1974  (1)
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  • Electronic Resource  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Fabrication of 15 nm wide trenches in Si by vacuum scanning tunneling microscope lithography of an organosilane self-assembled film and reactive ion etching (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 550-552 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Organosilane precursor molecules, here (aminoethylaminomethyl)phenethyltrimethoxysilane, or PEDA, are chemisorbed onto a Si surface forming a monolayer thick film. These films are patterned using the scanning tunneling microscope to locally modify the chemical reactivity and are then used as a template for selective electroless plating of a thin Ni film. Reactive ion etching in a C2F6/O2 mixture transfers this pattern into the substrate. Improvement over previous lithographic performance is achieved by growing the films on a passivated and lightly oxidized Si surface, optimizing the patterning conditions, and improving the metallization and etch chemistry. In this way, we have generated deep trenches on the order of 15±4 nm width, with edge roughness of 3 nm. We believe this demonstrates the resolution limiting factors of this lithographic process. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116396
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  • 2
    Electronic Resource
    Electronic Resource
    The use of video image analysis for the measurement of venous ulcers (1995)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 133 (1995), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary The accurate measurement of the size of skin wounds and ulceration is important for comparing the efficiency of treatment modalities and for monitoring progress in the individual patient. Although various methods of differing sophistication are in use, many of the common simpler techniques lack accuracy and reliability.We describe a new technique of ulcer measurement which uses video image recording, capture and computer analysis. A method of correcting for limb convexity in a two-dimensional image is presented. The method has an overall accuracy of 1–82% and a clinical precision of 3–41%, both of which are significantly better than acetate tracings or photographic methods. The technique is simple and rapid, and once established it incurs minimal ongoing costs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1995.tb02706.x
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  • 3
    Electronic Resource
    Electronic Resource
    Pangola stunt virus studied in pangolagrass and Digitaria hybrids (1972)
    Springer
    Euphytica 21 (1972), S. 344-351 
    Details
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Two Digitaria hybrids were compared with pangolagrass, Digitaria decumbens Stent., using both the light and electron microscope. The purpose of the study was to develop a diagnostic method of screening breeding lines for resistance or tolerance to pangola stunt virus (PSV). Pangolagrass from Surinam and Guyana, naturally infected with PSV, was found to have occassional bundle sheath cells with very thick cell walls. One of the two hybrids, which appeared to be highly susceptible to PSV, also showed similar thick cell walls. It had spherical particles 70 nm in diameter, resembling PSV, maize rough dwarf virus (MRDV) and rice dwarf virus (RDV). Sieve element cells of the phloem were the primary site of particles and the probable site of virus replication. The second hybrid, an apparently resistant line, was found to be completely free of thick-walled bundle sheath cells, and no viruslike particles were found in the bundle sheath or phloem cells. The presence of thick-walled bundle sheath cells appears to offer an excellent diagnostic test for PSV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00036775
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    Paper (German National Licenses)
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