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  • 1985-1989  (5)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Transportation system for 11CO2 (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 783-786 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A transportation system for safe movement of up to 1.0 Ci of 11CO2 from a production facility to an experimental facility 800 m away is described. This development allows plant physiological tracer kinetic studies to be performed in a remote laboratory location which is more suitable for plant growth. It also has the potential to allow field studies to be performed in nearby outdoor field plots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141019
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Automatic system for the control of batch-produced 11CO2 for continuous labeling experiments (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 467-469 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A system for storage and continuous dispensing of constant activity 11CO2 from batch production is described. The system has been used successfully to maintain constant activity levels for 2-h plant tracer kinetic experiments. This development now allows any existing cyclotron facility to supply a radioisotope stream continuously from a short batch irradiation. It requires no modification for use with other isotopes such as N-13 or O-15 in gaseous form and can be used in other biological and clinical investigations as well as the plant physiology investigations for which it was developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139862
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental tests of the Münch–Horwitz theory of phloem transport: effects of loading rates (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 9 (1986), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Extended square-wave tracer kinetics using 11CO2 were used to measure the speed of transport and activity level (proportional to concentration) in the phloem at high and low loading rates in six species of plants. In all cases, increased loading rates resulted in increased concentration. In most cases speed also increased, however, in two cases speed was lower and tracer activity was much higher at the higher loading rate. All the responses are consistent with the Münch Horwitz theory of phloem transport, depending upon the equation used to represent the unloading mechanism as described in a previous paper (Goeschl & Magnuson, 1986). For example, the latter two cases are consistent with the assumption that the unloading rate was limited by a process with saturable kinetics (enzyme-like).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1986.tb01572.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Short-term responses of phloem transport to mechanical perturbation (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 72 (1988), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Jaeger, C. H., Goeschl, J. D., Magnuson, C. E., Fares, Y. and Strain, B. R. 1988. Short-term responses of phloem transport to mechanical perturbation. - Physiol. Plant. 72: 588–594.Phloem transport was monitored using a continuous stream of 11CO2-labelled air administered to one leaf while gamma detectors measured 11C activity at intervals along the stem. The effect of gentle, non-injurious mechanical perturbation on phloem transport was tested in cotton (Gossypium hirsutum L. cv. Stoneville 213). Mechanical stimuli such as shaking, localized vibration and gentle massage were applied while the plants were at isotope equilibrium. Localized phloem blockages were observed within 1–2 min of the stimuli. The blockages lasted from 6–55 min and full recovery of transport required 20–175 min. The effect of preconditioning to mechanical perturbation on phloem transport was tested in bush beans (Phaseolus vulgaris L. cv. Cherokee Bush). Preconditioning of a bean seedling to gentle stem massage resulted in a shorter blockage response and quicker transport recovery period when the seedling was massaged during a 11C tracer experiment compared to a control seedling. These results indicate that measurements of phloem transport on recently disturbed plants will probably show depressed phloem transport velocities. Measurements should be made after at least a 24-h disturbance-free recovery period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1988.tb09169.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Tracer kinetics of plants carbon allocation with continuously produced11CO2 (1988)
    Springer
    Journal of radioanalytical and nuclear chemistry 124 (1988), S. 105-122 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Parameters of carbon allocation dynamics in plants were measured using11CO2 and tracer kinetics techniques. Mechanical agitation reduced carbon export rate by 33% in cotton seedling's leaf, while storage rate and export pool size increased. Carbon storage and export rates of C4 bunch grasses were higher in the afternoon than in the morning inspite of the decrease in CER. Water stress of cotton seedlings caused reduction in carbon export rate, and increase in exportable products concentrations and rate of storage. By the third stress day, measurable decreases in CER, transpiration, export rate and export pool size were recorded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035510
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    Paper (German National Licenses)
    Fulltext
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