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  • Springer  (6)
  • 1980-1984  (6)
  • 1981  (6)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Aquatic ecology 15 (1981), S. 29-40 
    ISSN: 1573-5125
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary 1. In addition to the earlier published late winter/spring diatom (Asterionella, Stephanodiscus, Fragilaria andCyclotella) succession (1977–1980), data on diatom summer and autumn pulses, and on the occurrence of maxima of other predominant algae (flagellates) in the epilimnion (which was sampled twice a week) are presented. 2. Asterionella andFragilaria also flowered in summer and autumn, irrespective of stagnation and overturn (the lake is completely mixed from December until April). Succession, as in spring, was not observed then; only one population (eitherAsterionella orFragilaria) was encountered, or both species concurred.Cyclotella had a summer maximum concurring with that ofAsterionella. Stephanodiscus only flowered in spring. 3. Dinobryon divergens had pronounced maxima in late spring and (together withcf. Chlamydomonas) in summer. It concurred withAsterionella andFragilaria, respectively withCyclotella. Cryptomonas, distinguished in two size classes, were permanently present. 4. The diatoms andDinobryon showed yearly variation in maximum numbers as well as in periodicity. 5. Simultaneously growing populations of two diatom species (in all seasons) and ofDinobryon with one or two diatom species (in summer) emphasizes the ‘paradox of the plankton’ (HUTCHINSON, 1961).
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    ISSN: 1573-739X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    European journal of plant pathology 87 (1981), S. 217-232 
    ISSN: 1573-8469
    Schlagwort(e): Sitobion avenae ; Metopolophium dirhodum ; Cryptococcus laurentii var.flavescens ; Cladosporium spp. ; Sporobolomyces roseus ; Aureobasidium pullulans ; honeydew ; damage-threshold ; agein of leaves ; photosynthesis ; Entomophthora ; winter wheat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Beschreibung / Inhaltsverzeichnis: Samenvatting Laboratorium- en veldproeven over de schade door bladluizen in tarwe worden beschreven. Een analyse van de directe en indirecte effecten van bladluizen op de groei van het gewas werd verricht. In het laboratorium werd een duidelijk effect van honingdauw en gisten op de fotosynthese gevonden. Dit effect kon niet worden gedemonstreerd in het veld, hetgeen waarschijnlijk wordt veroorzaakt door de orde van grootte van dit effect dat valt binnen de meetfout van de gewasfotosyntheseapparatuur. Het effect van honingdauw op veroudering, dat in het laboratorium werd vastgesteld, kon ook worden aangetoond in het veld en is waarschijnlijk een van de hoofdoorzaken van de oogstverliezen. Deze oogstverliezen in het veld bedroegen 700 kg ha−1 bij een maximale dichtheid van 35 bladluizen per halm en werden voor 72% veroorzaakt door direct zuigsschade en honingdauweffecten. Van de totale schade werd 28% veroorzaakt door saprofytische en wellicht ook door enige necrotrofe schimmels. De precieze bijdrage van ieder van de schadefactoren tot de schade werd niet vastgesteld, maar de wijze waarop directe en indirecte effecten hun bijdrage leverden aan de uiteindelijke oogstverliezen werd zichtbaar gemaakt.
    Notizen: Abstract Laboratory and field studies on aphid damage in wheat are described. Both direct and indirect effects of aphids on the behaviour of the crop were studied. In the laboratory a clear effect of honeydew and yeasts on photosynthesis was found. This effect could not be demonstrated under field conditions, since even at yield loss levels of 700 kg ha−1 the size of this effect may be undetectable with crop enclosures reaching an accuracy of 10%. The effect of honeydew on ageing, measured in the laboratory trials was also found in the field and may form a major cause of the yield losses found in the field. Yield losses under field conditions reached 700 kg ha−1 and were for 72% due to direct sucking damage of the 35 aphids, found maximally per culm, and direct and indirect honeydew effects. Saprophytic and possibly also some necrotrophic fungi caused 28% of the yield losses. The exact contribution of each of the damage factors was not revealed but it was demonstrated that direct and indirect effects contribute to the final yield losses.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Flow, turbulence and combustion 37 (1981), S. 45-52 
    ISSN: 1573-1987
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The object of this study is the class of closable Gabor operators. That is the set of operators which map a Gabor function (or ‘note’) into a multiple of a Gabor function. By using the Bargman space (sometimes called Bargman representation) some general properties of these operators are derived. It is shown that the set of Gabor operators whose adjoint is also a Gabor operator establishes a six-dimensional complex manifold with a partial Lie-group structure and with an involution. The corresponding Lie-algebra and the infinitesimal generators are calculated. Further it turns out that, at least locally, a Gabor operator with a Gabor adjoint results from an evolution process. The proofs of the theorems are a hybridization of Hilbert space techniques and classical complex analysis (theorems of Osgood, Montel, etc.). The proofs will be published elsewhere in a wider context.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 1981-10-01
    Print ISSN: 0165-1404
    Thema: Biologie
    Publiziert von Springer
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Publikationsdatum: 1981-01-01
    Print ISSN: 1386-6184
    Digitale ISSN: 1573-1987
    Thema: Maschinenbau
    Publiziert von Springer
    Standort Signatur Erwartet Verfügbarkeit
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