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  • 1
    Electronic Resource
    Electronic Resource
    Auxin-induced assimilate translocation in the bean stem (Phaseolus vulgaris L.) (1987)
    Springer
    Plant growth regulation 5 (1987), S. 169-181 
    Details
    ISSN: 1573-5087
    Keywords: assimilate translocation ; auxin ; invertase (EC 3.2.1.26) ; Phaseolus vulgaris ; phloem translocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Decapitation of the fully-elongated fourth internode of Phaseolus vulgaris plants resulted in the disappearance from the internode of soluble acid invertase (EC 3.2.1.26). This loss was prevented by local applications to the internode of indol-3yl-acetic acid (IAA) and, at the point of IAA application, the specific activity of the enzyme increased by up to 3 times its initial value within 48 h of treatment. IAA applications stimulated the acropetal translocation to the internode of 14C-sucrose applied to the subtending (second) trifoliate leaf 30 h after decapitation and the start of the auxin treatment. Labelled assimilates accumulated in the IAA-treated region of the internode. Following decapitation the concentration of hexose sugars in the internode fell and that of sucrose rose substantially, but these trends were reversed by IAA treatment. However, small local accumulations of sucrose occurred at the point of auxin application where tissue concentrations of IAA were greatest (determined using [1-14C] IAA). Considerable quantities of starch were present in the ground parenchyma of the internodes at the start of the experiment but, in the absence of IAA, this was remobilised within 48 h of decapitation. IAA prevented starch loss at and below its point of application to the internode, but not from more distal tissues. Cambial proliferation, radial growth and lignification were stimulated in and below IAA-treated regions of the internode. These observations are discussed in relation to the hormonal regulation of assimilate translocation in the phloem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024693
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Stimulation of acid invertase activity by indol-3yl-acetic acid in tissues undergoing cell expansion (1986)
    Springer
    Plant growth regulation 4 (1986), S. 259-271 
    Details
    ISSN: 1573-5087
    Keywords: Acid invertase (β-fructofuranosidase) ; auxin ; cell expansion ; Phaseolus vulgaris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The soluble acid invertase activity of young, excised P. vulgaris internodal segments fell when they were incubated in water, and their elongation ceased within 6–7 h. IAA (10 μM) promoted segment elongation and stimulated an increase in the specific activity of acid invertase to a level greater than that originally present. The rate of segment elongation in the presence of IAA was closely and positively correlated with the specific activity of the enzyme. Optimum concentration of IAA for both elongation and stimulation of invertase activity was 10 μM. Concurrent protein synthesis was necessary for these responses to IAA. Segments cut from mature, fully-elongated internodes did not responsd to IAA. Inclusion of Ca2+, vanadate or mannitol in the incubation medium abolished IAA-induced segment elongation but did not inhibit the stimulation of acid invertase activity by IAA. Auxin-induced elongation and acid invertase activity were both substantially increased in the presence of up to 25 mM D-glucose or up to 50 mM sucrose. Inclusion of either sugar in the medium considerably increased tissue hexose concentrations. Under some circumstances cell growth and invertase synthesis may compete for available hexose substrate. It is concluded that IAA-induced promotion of acid invertase in P. vulgaris internodal segments is not simply an indirect consequence of removal of end-product (hexose) during IAA-induced cell growth and that a more direct action of IAA on enzyme turnover is involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028169
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  • 3
    Electronic Resource
    Electronic Resource
    The Probable Number of Particles in Contact when Spread on a Microscope Slide (1987)
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 4 (1987), S. 20-21 
    Details
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: It is shown that the number of particles which may be placed upon a slide is surprisingly limited if each particle is to be isolated. This is particularly relevant if automatic image analysis of size or shape is to be achieved without tedious editing. Using a simple mathematical treatment it is possible to calculate, for any particular size of particle, the number of particles on a slide which should not be exceeded.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ppsc.19870040105
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  • 4
    Electronic Resource
    Electronic Resource
    Demonstrating the Sampling of Heterogeneous, free-flowing, segregating powders (1988)
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 5 (1988), S. 23-28 
    Details
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Experiments with common powder laboratory apparatus are used to illustrate the problems of sampling a poorly mixed quantity of glass ballotini. The use of known and easily sieved mixtures permits the quantitative analysis of the results to show how bias in samples may be detected.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ppsc.19880050106
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  • 5
    Electronic Resource
    Electronic Resource
    Sampling Powders for Shape Description (1984)
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 1 (1984), S. 22-27 
    Details
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: For some time studies have been made relating the values obtained from simple shape description to bulk powder properties. More recently the detailed mathematical description of particle outline has become possible and quite powerful techniques have been developed. These techniques may be used for the regeneration by computer of the shape and, more importantly, for studies relating shape to individual particle behaviour and to bulk powder properties. Quite inadequate attention has been directed to the task of obtaining from the laboratory sample of the bulk powder a representative sample of shapes without bias. In this communication the considerations to be included in the sampling procedure are reviewed and a possible solution to the problems posed is presented.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ppsc.19840010104
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    Paper (German National Licenses)
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