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  • 42.60.Fc  (1)
  • Top growth  (1)
  • Springer  (2)
  • Mineralogical Society of America
  • 1
    Electronic Resource
    Electronic Resource
    Contrast mechanisms in photothermal scanning tunneling microscopy (1994)
    Springer
    Applied physics 59 (1994), S. 109-113 
    Details
    ISSN: 1432-0630
    Keywords: 42.60.Fc ; 61.30 ; 68.15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract By irradiation of the tunneling junction of a scanning tunneling microscope with intensity-modulated laser light a gap-width modulation due to thermal expansion of tip and sample was produced. Photothermal images were obtained by spatial mapping of the resulting modulation of the tunneling current or its logarithm. The various mechanisms responsible for the observed contrast are discussed quantitatively. In case of a highly corrugated gold film on mica the contrast arises mainly from either the current variations caused by the non-zero reaction time of the current control loop or from a geometry factor. In both cases the images reflect certain properties of the sample topography. On the other hand, for a liquid-crystal film adsorbed on graphite a contrast on a molecular scale was found which is attributed to variations of the effective barrier height.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332202
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of growth regulators on root cation exchange capacity of young clonal tea plants (1984)
    Springer
    Plant and soil 79 (1984), S. 441-444 
    Details
    ISSN: 1573-5036
    Keywords: Brown: white root ratio ; CEC ; Growth regulators ; Tea ; Top growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A sand culture experiment was conducted under glasshouse conditions to study the effect of gibberellic acid (GA3), indol-3yl-acetic acid (IAA) and 2,4-dichlorophenoxy acetic acid (2,4-D) on root cation exchange capacity (CEC) of two genetically different tea clones. Results showed that application of GA3 and IAA progressively increased root CEC in both clones when their concentration was raised from 0 to 100 mgl−1. 2,4-D at its lower concentration (〈25 mg l−1) produced the same effect, while at higher concentration (100 mg l−1) there was a decrease in root CEC. The root CEC was correlated negatively with brown: white root ratio and positively with top growth of clonal tea plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184335
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