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  • 79.20.Ds  (1)
  • Key words Wheat  (1)
  • Laser-induced removal  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Optical and acoustic study of nucleation and growth of bubbles at a liquid-solid interface induced by nanosecond-pulsed-laser heating (1994)
    Springer
    Applied physics 58 (1994), S. 407-415 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 64.70.Fx ; 79.20.Ds
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The dynamics of liquid-vapor phase-change in the nanosecond time-scale induced by pulsed-laser heating of a liquid on a solid sample is studied by means of optical reflectance and scattering measurements, and the piezoelectric detection technique. The liquids studied include water, ethanol, methanol, IsoproPropyl Alcohol (IPA), and mixtures of water and IPA. The threshold fluence for nucleation is determined with high accuracy using the optical and acoustic signals. Heat diffusion calculations performed for the threshold fluences indicate that the liquids are sufficiently superheated before nucleation sets on. The transient optical reflectance signal is analyzed by an effective-medium theory to provide bubble-growth kinetics, so that the bubble-growth velocity for the test liquids could be estimated. In addition, it is observed that, following the thermally induced nucleation, repetitive acoustic cavitation at the surface of the solid sample occurs, with a time interval related to the speed of sound in the liquid.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00323618
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Conservation in wheat high-molecular-weight glutenin gene promoter sequences: comparisons among loci and among alleles of the GLU-B1-1 locus (1998)
    Springer
    Theoretical and applied genetics 96 (1998), S. 568-576 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Key words Wheat ; High-molecular-weight glutenin ; Promoter ; Transposon ; Genome evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  The high-molecular-weight glutenin (HMW) genes and encoded subunits are known to be critical for wheat quality characteristics and are among the best-studied cereal research subjects. Two lines of experiments were undertaken to further understand the structure and high expression levels of the HMW-glutenin gene promoters. Cross hybridizations of clones of the paralogous x-type and y-type HMW-glutenin genes to a complete set of six genes from a single cultivar showed that each type hybridizes best within that type. The extent of hybridization was relatively restricted to the coding and immediate flanking DNA sequences. Additional DNA sequences were determined for four published members of the HMW-glutenin gene family (encoding subunits Ax2*, Bx7, Dx5, and Dy10) and showed that the flanking DNA of the examined genes diverge at approximately −1200 bp 5′ to the start codon and 200–400 bp 3′ to the stop codon. These divergence sites may indicate the boundaries of sequences important in gene expression. In addition, promoter sequences were determined for alleles of the Bx gene (Glu-B1-1), a gene reported to show higher levels of expression than other HMW-glutenin genes and with variation among cultivars. The sequences of Bx promoters from three cultivars and one wild tetraploid wheat indicated that all Bx alleles had few differences and contained a duplicated portion of the promoter sequence “cereal-box” previously suspected as a factor in higher levels of expression. Thus, the “cereal-box” duplication preceeded the origin of hexaploid wheat, and provides no evidence to explain the variations in Bx subunit synthesis levels. One active Bx allele contained a 185-bp insertion that evidently resulted from a transposition event.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001220050775
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  • 3
    Digitale Medien
    Digitale Medien
    Laser cleaning: Laser-induced removal of particles from surfaces (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 2 (1993), S. 63-70 
    Details
    ISSN: 1057-9257
    Schlagwort(e): Particulate ; Contamination ; Laser-induced removal ; Particle removal ; Laser cleaning ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Pulsed-laser-induced removal of particles from surfaces is a new cleaning technique. This laser cleaning can be performed on dry surfaces as well as on wet surfaces with a micron-thick liquid film during pulsed laser irradiation to provide enhanced removal efficiency. Using the latter technique, to be called ‘steam laser cleaning’ here, we are able to remove epoxy, alumina, silicon or gold particles with diameters in the range 0.1-10 μm from silicon and other surfaces.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/amo.860020108
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