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  • 1
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archiv der Mathematik 60 (1993), S. 420-424 
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-0514
    Keywords: C*-algebras ; AF algebras ; inductive limits ; K-theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract For any finite groupG we construct examples of an AF algebraA and an action α byG onA such that the fixed point algebra αα is not AF. The construction ofA is done by successive foldings and cuttings of the interval in a way originally suggested by Blackadar and, in a different context, by Connes in his talk in Oslo in 1978.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Small business economics 2 (1990), S. 259-260 
    ISSN: 1573-0913
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Small business economics 2 (1990), S. 319-330 
    ISSN: 1573-0913
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract This paper uses data from the Current Population Surveys for 1968–1987 and from the National Longitudinal Survey of Young Men to examine the relationship among unemployment and small business formation and dissolution for white men and women. We find that self-employed workers are more likely to have experienced unemployment than are wage workers because their higher entry rate into self-employment offsets their higher exit rate out of self-employment. Unemployed men and women who enter self-employment experience a larger drop in their earnings than the unemployed who return to wage work.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-2048
    Keywords: Alkaloid biosynthesis ; Enzyme purification ; Nicotiana ; N-Methylputrescine oxidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The enzyme N-methylputrescine oxidase which catalyses the conversion of N-methylputrescine to N-methylpyrrolinium salt has been purified to homogeneity from transformed roots of Nicotiana tabacum L. cv SC58. The enzyme has an apparent sub-unit molecular weight of 53 kDa by sodium dodecyl sulphate-polyacrylamide gel electrophoresis with gel-filtration studies, indicating that the native form is a dimer. The K m of the enzyme for N-methylputrescine has been estimated to be 0.1 mM. Polyclonal antibodies raised to the purified protein recognise one product in an immunoblot of a crude extract of transformed root tissue and will immunoprecipitate N-methylputrescine oxidase activity from such an extract. The antibodies also show a high degree of specificity in immunoblots of crude extracts of transformed root cultures from a range of other solanaceous and non-solanaceous species but do not cross-react with a partially purified preparation of pea-seedling diamine oxidase.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 18 (1994), S. 797-814 
    ISSN: 1432-1009
    Keywords: Agricultural development ; Agroecology ; Agroforestry ; Forest garden ; Human Ecology ; Land degradation ; Sustainability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Forest gardens are traditional agroecosystems in the humid tropics that have evolved a forestlike structure and as such are commonly thought to be a good example of sustainable agriculture. While this may be true in the sense of soil protection and maintenance of biodiversity, they are not necessarily maintainable in the context of competing land use in the landscape. Such appears to be the case of forest gardens in the uplands of Uva Province of Sri Lanka. This paper reports an agroecological analysis of forest gardens and other forms of land use in Uva, and discusses how this understanding can be used to make use of the good properties of forest gardens. It shows that although they have very real environmental and social benefits, they are unable to satisfy the material needs of a rural population undergoing demographic and cultural changes. However, the alternative land-use systems, both private smallholder and state owned, have serious deficiencies with respect to long-term sustainability, and it is essential to develop appropriate alternatives. It should be possible to design a smallholder farming system that incorporates the high productivity of market gardens (i.e., the cultivation of seasonal crops such as vegetables) with, at least, the high stability and biophysical sustainability of the forest garden. Considerable work still needs to be done on the design of such a system as well as the agency for its development and promotion. The paper treats the forest gardens of Uva as a case study from which some general conclusions can be drawn with respect to the conscious development of forest garden systems elsewhere in the tropics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Communications in mathematical physics 165 (1994), S. 445-484 
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We apply the notion of orbifold models ofSU(N) solvable lattice models to the Hecke algebra subfactors of Wenzl and get a new series of subfactors. In order to distinguish our subfactors from those of Wenzl, we compute the principal graphs for both series of subfactors. An obstruction for flatness of connections arises in this orbifold procedure in the caseN=2 and this eliminates the possibility of the Dynkin diagramsD 2n+1 , but we show that no such obstructions arise in the caseN=3. Our tools are the paragroups of Ocneanu and solutions of Jimbo-Miwa-Okado to the Yang-Baxter equation.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 18 (1994), S. 321-329 
    ISSN: 1432-1009
    Keywords: Recycling ; Societal objectives ; Conflict ; Evaluation ; Intervention
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The decision as to whether to recycle discarded objects or not has traditionally been made on a simple financial basis. However, over the last few years a popular movement has sprung up which regards recycling as a good in itself, and this movement finds itself at odds with the present financial basis for recycling. In this paper a rationale for recycling is worked out in an attempt to resolve this conflict. It is concluded that the normal market signals do not provide a proper basis for recycling decisions and that this market failure must be corrected by government intervention. However, this intervention should not take the form of uncritical support for recycling. Rather the societal objectives of individual recycling proposals should be identified and the proposal should then be evaluated in terms of whether it would achieve these objectives more effectively than some alternative action.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1573-5028
    Keywords: Agrobacterium rhizogenes-transformed root cultures ; Nicotiana rustica ; nicotine ; ornithine decarboxylase ; putrescine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Transformed root cultures of Nicotiana rustica have been generated in which the gene from the yeast Saccharomyces cerevisiae coding for ornithine decarboxylase has been integrated. The gene, driven by the powerful CaMV35S promoter with an upstream duplicated enhancer sequence, shows constitutive expression throughout the growth cycle of some lines, as demonstrated by the analysis of mRNA and enzyme activity. The presence of the yeast gene and enhanced ornithine decarboxylase activity is associated with an enhanced capacity of cultures to accumulate both putrescine and the putrescine-derived alkaloid, nicotine. Even, however, with the very powerful promoter used in this work the magnitude of the changes seen is typically only in the order of 2-fold, suggesting that regulatory factors exist which limit the potential increase in metabolic flux caused by these manipulations. Nevertheless, it is demonstrated that flux through a pathway to a plant secondary product can be elevated by means of genetic manipulation.
    Type of Medium: Electronic Resource
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