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  • 1995-1999  (3)
  • Dictyopteris prolifera  (1)
  • PACS: 87.64.Dz; 61.16.Ch; 81.15.Ef  (1)
  • Single cell  (1)
  • Subtraction  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Mechanism of tip-assisted migration and desorption of DNA base molecules on an SrTiO3(100)- 〈 ![IGNORE[$\sqrt{5}$]] × 〈 ![IGNORE[$\sqrt{5}$]] surface (1998)
    Springer
    Applied physics 66 (1998), S. S719 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 87.64.Dz; 61.16.Ch; 81.15.Ef
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 3 (100)- × surfaces with ultrahigh vacuum scanning tunnel ing microscopy (UHV-STM) at room temperature. Adenine molecules migrate over the surface at a negative sample bias voltage and they are desorbed from the surface at a positive sample bias. The tip-assisted migration occurred in the two different modes, which are influenced by a high-intensity electric field and the tip-molecule contact interaction. The tip-assisted desorption was induced in a high-intensity electric field. These modes were based on quantitative measurements of the absolute tip-sample distance and of the electric field between the tip and the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051229
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Protoplast isolation in the marine brown alga Dictyopteris prolifera (Dictyotales) (1995)
    Springer
    Plant cell reports 14 (1995), S. 571-574 
    Details
    ISSN: 1432-203X
    Keywords: Crassostrea gigas ; Dictyopteris prolifera ; Marine brown alga ; Protoplast ; Single cell
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Protoplasts were isolated from thalli of Dictyopteris prolifera using a mixture of crude enzymes from vicera of live oysters (Crassostrea gigas) and the following commercial enzymes: an abalone enzyme, cellulase, polygalacturonase and hemicellulase. The enzyme mixtures produced up to 3.3 × 107 cells per l g of tissue fresh weight. The conversion to protoplasts of the cells was about 100% using the oyster enzyme or the abalone enzyme alone. The optimum pH for protoplast isolation was 6.0 and 20 hours were required for conversion to protoplasts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231940
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Image processing in the digital tomosynthesis for pulmonary imaging (1995)
    Springer
    European radiology 5 (1995), S. 96-101 
    Details
    ISSN: 1432-1084
    Keywords: Digital radiography ; Image processing ; Subtraction ; Thorax ; Tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Digital tomosynthesis makes it possible to reconstruct multiple tomographs from digital data obtained during a single tomographic motion and permits digital processing, which adds a number of special advantages to the well-known advantages of conventional tomography. We performed digital tomosynthesis with a fluororadiographic TV unit with tomographic function which was capable of producing pulsed low-and high-energy X-rays alternately, and we studied digital image processing to improve the image clarity of the reconstructed tomographs. To identify the optimal parameters for processing image data by means of spatial frequency filtration we evaluated the spatial frequency distribution of image data in linear tomographs of the lung, and on the basis of the results of this study we developed several types of digital image processing to reduce tomographic blur and system noise, to improve visualisation of faint opacities, to reduce resistant tomographic blur as well as overall blur, and to generate low-noise bone images based on dual-energy subtraction tomosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00178089
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    Paper (German National Licenses)
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