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  • 1
    Book
    Book
    Boston, MA :Harvard Business School Press,
    Title: ¬The¬ social life of information
    Author: Brown, John S.
    Contributer: Duguid, Paul
    Publisher: Boston, MA :Harvard Business School Press,
    Year of publication: 2000
    Pages: 320 S.
    Type of Medium: Book
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Mineralium deposita 5 (1970), S. 103-119 
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Résumé L'éditeur du symposium (New York, 1966) sur les gisements de plomb-zinc du type Mississippi Valley, ici examine ces resultats et les supplée de contributions subsequentes. Arrangement en tableaux des conclusions d'autorités contemporains montre que l'opinion en Amérique du Nord converge vers l'acceptance d'un fluide marin conné, mais epigénétique, avec d'additions mineurs de sources profondes. Les inclusions fluides sont acceptées comme bonne indication de la nature de la solution responsable de minéralization. L'opinion européene, au contraire, se divide également entre les proponents de syngénèse-diagénèse et ceux qui favorisent une origine magmatique-epigénétique. Une troisième rue, particulièrement francaise, supporte un concept hydatogène, utilisant des eaux météoriques circulants profondement. En Europe les inclusions fluides ont été peu etudiées au présent. L'auteur evalue ces hypothèses accentuant les bases du concept Américain, et signalant les objections à l'explication syngénétique-diagénètique. La probabilité d'un origin hybride de gisements Américains et Européens est accentuée et est offerte comme éxplication de la mystère d'anomalies des isotopes du plomb de J-type en Amérique et de B-type en Europe.
    Notes: Abstract Tabulation of the conclusions of prominent contemporary workers on the Mississippi Valley lead-zinc ore shows North American opinion converging toward acceptance of a dominantly connate marine, but epigenetic ore fluid with probably minor additions from deeper sources. Fluid inclusions are taken as a reliable index of the nature of the ore solution. European opinion, in contrast, is divided almost equally between proponents of syngenesis-diagnesis, and of magmatic-epigenetic origin, with a third contingent, mainly French, supporting a hydatogene concept based on deeply circulating meteoric water. Little attention has been given to fluid inclusions in Europe. The author evaluates these hypotheses in the light of his considerable experience with Mississippi Valley ore deposits, emphasizing the basis for the North American concept, and pointing out weaknesses in the syngenetic-diagenetic explanation. The probability of hybrid sources for both American and European deposits is stressed, and offered as a solution to the mystery of the typically North American J-type, and European B-type anomalies of lead isotope composition.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-5060
    Keywords: Hordeum vulgare ; cultivated barley ; Hordeum leporinum ; barley grass ; Rhynchosporium secalis ; scald ; pathogenic variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The pathogenicity of 182 single spore isolates of Rhynchosporium secalis from Hordeum leporinum and 94 isolates from H. vulgare collected from throughout southeastern Australia was tested on 15 barley varieties, each having different combinations of resistance genes. Forty five percent of the barley grass isolates were pathogenic on 5 or more varieties but only 6% of the cultivated barley isolates attacked this range of varieties. On the basis of reaction type 20 different pathogenicity groups were recognised, with barley grass isolates being classified into 19 and the cultivated barley isolates into 5, four of which were the same as the barley grass isolates. Numerical analysis of data on leaf area damage inferred 33 groups, 24 of which were unique to barley grass isolates, two to cultivated barley isolates and 9 common to both groups. There was as much variation in pathogenicity among single spore isolates from the same lesion as between isolates from different lesions collected from the same or different locations.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 34 (1985), S. 129-133 
    ISSN: 1573-5060
    Keywords: Hordeum vulgare ; barley ; Rhynchosporium secalis ; scald ; pathogenic variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Three hundred and nineteen Rhynchosporium secalis isolates from cultivated barley were divided into five groups on the basis of their virulence on 15 differential barley varieties. Pathogenic variation was also demonstrated for isolates from different scald lesions within the same crop and amongst different spores from the same lesions.
    Type of Medium: Electronic Resource
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