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  • 1985-1989  (3)
  • 1925-1929
  • Biochemistry and Biotechnology  (1)
  • Gradient  (1)
  • transitive closure  (1)
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Material
Years
  • 1985-1989  (3)
  • 1925-1929
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Hierarchical complexity in ecology: a noneuclidean conception of the data space (1987)
    Springer
    Plant ecology 69 (1987), S. 17-25 
    Details
    ISSN: 1573-5052
    Keywords: Curvature ; Gradient ; Hierarchy theory ; Level ; Noneuclidean space ; ordination ; Scale ; Transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Vegetation is the consequence of the interaction of a series of widely differing processes, each uniquely scaled. Extensive slow processes pertain to high levels of organization, while fast local processes pertain to lower levels. Curvature in ordination gradients is often not artefact, but the result of interference between different levels. As straight gradients are lengthened by the inclusion of more heterogeneity in the data, the nature of relationships change between species and their environment and each other at distant places in environmental space. With change in these relationships, movement down the gradient does not always mean the same thing, and this causes curvature. In plotting a noneuclidean space onto a euclidean reference, the change in metrics causes apparent curvature. The technical causes of curvature (bimodality, double zeros, beta diversity) fit this model. Data transformations scale the analyses so that different levels are reflected in results. Between levels, when the processes of the lower level are not local enough to be trivial, the pattern from new upper level processes cannot assert a new straight gradient with coarser grained criteria. Thus transformation and the emergence of curvature followed eventually by new straight gradients allow the linking of different levels in an orderly fashion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00038683
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Practical parallel Union-Find algorithms for transitive closure and clustering (1988)
    Springer
    International journal of parallel programming 17 (1988), S. 403-423 
    Details
    ISSN: 1573-7640
    Keywords: Parallel algorithms ; clustering ; transitive closure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Practical parallel algorithms, based on classical sequential Union-Find algorithms for computing transitive closures of binary relations, are described and implemented for both shared memory and distributed memory parallel computers. By practical algorithms, we mean algorithms that are efficient for parallel systems with bounded numbers of processors as opposed to algorithms where the number of processors grows with the problem size. Transitive closures are useful for decomposing many applications problems into independent subproblems. The implementations were on an ENCORE Multimax shared memory machine and an NCUBE hypercube. Our implementations indicate that transitive closure computations are intrinsically difficult for distributed memory parallel machines because of the need for global information. By contrast, our results for shared memory machines exhibited excellent speedups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01383882
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Fractionation of Aspergillus niger cellulases by combined ion exchange affinity chromatography (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 29 (1987), S. 176-179 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Eight chemically modified cellulose supports were tested for their ability to absorb components of the Aspergillus niger cellulase system. At least two of the most effective adsorbents, aminoethyl cellulose and carboxymethyl cellulose, were shown to be useful for the fractionation of cellulases. These supports apparently owe their resolving capacity to both ion exchange and biospecific binding effects; however, the relative importance of each effect is unknown. These observations form the basis for a new cellulase fractionation technique, combined ion exchange-affinity chromatography.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260290206
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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