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  • 11
    Electronic Resource
    Electronic Resource
    The Freja ultraviolet imager (1994)
    Springer
    Space science reviews 70 (1994), S. 421-446 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Auroral images acquired by satellite instrumentation have proven to be a crucial component of the scientific equiry into the physical processes of the Earth's magnetosphere. TheFreja mission provided an opportunity to extend these measurements into the temporal and spatial regime commonly associated with ground-based optical imagers. Employing the basic procedure used successfully in theViking program allowed image repetition rates of 6 s to be achieved with simultaneous exposure of all pixels within the field-of-view. Typical exposure times of 0.3 s required development of an improved image intensifier system and operational requirements resulted in image formats covering approximately one-third of a spin. Simultaneously exposing two broad-band UV cameras, the instrument generates in its normal operational mode 264.6 kbytes per image pair. Results from initial operations confirm the design approach and suggest such imagers can be routinely included on challenging low cost missions such asFreja.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00756880
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    The metabolism of N6(Δ2-isosopentenyl) [3H]adenine by different stem sections of Pisum sativum (1990)
    Springer
    Plant growth regulation 9 (1990), S. 237-246 
    Details
    ISSN: 1573-5087
    Keywords: Pisum sativum ; cytokinin metabolism ; apical dominance ; auxin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Serial segments of internodal stem tissue were isolated from Pisum sativum L. shoots and incubated in a medium containing N6(Δ2-isosopentenyl) [3H]adenine. The recovery of radioactive derivatives separated using HPLC indicated a gradient of cytokinin metabolic activity in the stem. This gradient of activity was found to be greatest at the basal node in young seedlings but was high both at upper and lower nodes in older plants. An attempt to correlate this phenomenon with the basipetally decreasing concentration of indole-3-acetic acid in the stem led to an experiment in which stem segments were pretreated in indole-3-acetic acid solutions before incubating in a medium containing N6(Δ2-isosopentenyl) [3H]adenine. Indole-3-acetic acid was found to have a marked effect on cytokinin metabolism in isolated stem segments. These results are discussed in relation to apical dominance in the shoot.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00045286
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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