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  • 1
    Electronic Resource
    Electronic Resource
    Xylem dysfunction during winter and recovery of hydraulic conductivity in diffuse-porous and ring-porous trees (1996)
    Springer
    Oecologia 105 (1996), S. 435-439 
    Details
    ISSN: 1432-1939
    Keywords: Embolism ; Freezing stress ; Water relations ; Root pressure ; Xylem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Xylem embolism in winter and spring as well as the occurrence of positive xylem pressure were monitored in several diffuse-porous and one ring-porous tree species (Fraxinus excelsior). In Acer pseudoplatanus and Betula pendula embolism reversal was associated with positive (above-atmospheric) xylem pressures that frequently occurred during a 2-month period prior to leaf expansion. In Acer high stem pressures were occasionally triggered on sunny days after a night frost. The other species investigated showed no positive xylem pressure during the monitoring period in 1995. Populus balsamifera exhibited a complete embolism reversal in 1994, but, like Fagus sylvatica, recovery was slow and incomplete in 1995. Fraxinus did not refill embolized vessels, but relied entirely on the production of new earlywood conduits in May. Populus × canadensis Moench “robusta” did not recover from embolism during the monitoring period. Under a simulated root pressure of 20 kPa however, excised branches of Populus × canadensis restored maximum hydraulic conductance within 2 days, illustrating the great influence of even small positive pressures on cnductivity recovery in spring. In the absence of positive pressure there was no substantial refilling of embolized vessels within a rehydration period of 9 days.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330005
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The RAPPID Project: Symbiosis between Industrial Requirements and MAS Research (1999)
    Springer
    Autonomous agents and multi-agent systems 2 (1999), S. 111-140 
    Details
    ISSN: 1573-7454
    Keywords: manufacturing design ; set-based design ; emergent behavior ; market-based coordination ; human-computer integration ; least commitment negotiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract The RAPPID project (Responsible Agents for Product-Process Integrated Design) is developing agent-based software tools and methods that use market place dynamics among members of a distributed design team to coordinate set-based design of discrete manufactured products. This report describes the interplay of industrial requirements and Multi-Agent System (MAS) research in the design, implementation, and testing of RAPPID. Like any industrial project, RAPPID begins with the requirements of the problem domain, and draws selectively from research results to meet those requirements. However, the flow of information is not unidirectional. In the process of addressing its requirements, RAPPID developed some new concepts that hold promise for broader application to distributed constraint optimization. RAPPID is work in process, not a completed product, and this report includes an assessment of what needs to be done in addition to what has been accomplished.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010039424126
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The ultrastructure of Strasburger cells (= albuminous cells) in the secondary phloem ofPinus nigra var.austriaca (Hoess) Badoux (1976)
    Springer
    Protoplasma 88 (1976), S. 31-49 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ultrastructure of Strasburger cells (= albuminous cells) in the secondary phloem ofPinus nigra var.austriaca (Hoess) Badoux is described in different stages of differentiation and compared with that of ordinary ray parenchyma cells. Most characteristic for Strasburger cells contiguous with mature sieve cells in summer are the absence of starch, the presence of peculiar cytoplasmic bridges with the sieve cells, and a relatively dense protoplast; during differentiation the central vacuole fragments into many small vacuoles. In addition, these cells differ substantially by the abundance of polysomes which is paralleled by the highly decondensed state of the euchromatin and by the increased outer surface of their lobed nuclei. Mitochondria are fairly abundant. The small vacuoles always show dark lined tonoplasts. Cytoplasmic tubuli which nature is still unknown are described. Increased nuclear surface, highly decondensed euchromatin, and abundance of polysomes are taken to indicate an increased rate of transcription/translation events. This, together with the abundance of mitochondria suggests an increased physiological activity. Because these structural peculiarities could not be detected so far in Strasburger cells contiguous with immature sieve cells, nor in ordinary ray parenchyma cells, they are considered to be related to the peculiar function of active Strasburger cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01280358
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    Paper (German National Licenses)
    Fulltext
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