Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 11
    Electronic Resource
    Electronic Resource
    Springer
    BioControl 32 (1987), S. 303-309 
    ISSN: 1573-8248
    Keywords: Pacific damsel bug ; nabid ; functional response ; Punaise du Pacifique ; nabide ; réponse fonctionnelle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé La punaise,Nabis kinbergii Reuter est rencontrée communément dans les champs de luzerne à la fin de l'été et durant l'automne en Nouvelle Zélande. Son potentiel en tant que prédateur des espèces communes d'insectes ravageurs n'a pas encore été étudié. Ce travail rend compte de la roponse fonctionnelle des femelles adultes et des 5e stades larvaires de cette punaise vis-à-vis de deux espèces proies, le miride:Sidnia kinbergi (Stal) et le puceron du pois:Acyrtosiphon pisum (Harris). Une équation deHolling (1959) de type II définit bien la réponse fonctionnelle de ce prédateur sauf lorsque les 5e stades n'ont que des nymphes du Miride pour proie. Cette punaise,Nabis kinbergii manifeste des réponses identiques à celles d'un autreNabidae: Reduviolus americoferus (L.).
    Notes: Abstract The functional responses of adult and 5th instar Pacific damsel bug,Nabis kinbergii Reuter were determined under laboratory conditions using Australian crop mirid,Sidnia kinbergi (Stal), and pea aphid,Acyrthosiphon pisum (Harris) as prey.Holling's (1959) type II equation was found to adequately define the functional response of this predator except when 5th instar nymphs were provided with Australian crop mirid as prey. In this instance, a type III response was found.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 12
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 335 (1988), S. 21-22 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DURING the nineteenth century, the discovery and study of 'lost civilizations' gave great impetus to the development of archaeology. The surviving traces of such civilizations - whether in the Mycenaean and Minoan palaces of the Aegean, the frontier defences of the Roman Empire, the pyramids of the ...
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 13
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 203 (1964), S. 872-873 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Tracings from original records illustrating the modification of the form of the action potential when anodal current (dashed line), and cathodal current (solid line) are applied during the repolarization phase. The normal course of repolarization is shown by the fine solid line. Action ...
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 14
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The reaction64Ni(36S,34Si)66Zn atE=198 MeV has been used to measure the mass excess of34Si; a value of −19.971 −0.044 +0.037 MeV was obtained. This result which is in agreement with the previous value (−19.85±0.30 MeV) is in excellent agreement with recent shell-model mass predictions. The result is discussed within the context of the proposed region of deformation aroundZ=11,N=20.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 15
    ISSN: 1432-2048
    Keywords: Acer ; Daucus ; Cell culture ; Freeze-fracture (rapid freezing) ; Membrane recycling ; Plasma membrane ; Secretion (vesicle-mediated)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Freeze-fracture electron microscopy of propane-jet-frozen samples has been employed to investigate vesicle-mediated secretion and membrane recycling events in carrot (Daucus carota L.) and sycamore maple (Acer pseudoplatanus L.) suspension-culture cells. Stabilization of the cells by means of ultrarapid freezing has enabled us to preserve the cells in a turgid state and to visualize new intermediate membrane configurations related to these events. Indeed, many of the observed membrane configurations, such as flattened membrane vesicles with slit-shaped membrane fusion sites and horseshoe-shaped membrane infoldings, appear to result from the action of turgor forces on the plasma membrane. Individual cells exhibited great variations in numbers and types of membrane configurations postulated to be related to secretion and membrane-recycling events. In the majority of cells, the different membrane profiles displayed a patchy distribution, and within each patch the membrane configurations tended to be of the same stage. This result indicates that secretory events are triggered in domains measuring from 0.1 to about 10 μm in diameter. Based on an extensive analysis of the different membrane configurations seen in our samples, we have formulated the following model of vesicle-mediated secretion in plant cells: Fusion of a secretory vesicle with the plasma membrane leads to the formation of a single, narrow-necked pore that increases in diameter up to about 60 nm. During discharge, the vesicle is flattened, forming a disc-shaped structure perpendicular to the plane of the plasma membrane. As the vesicle is flattened, the pore is converted to a slit, the maximum length of which coincides with the diameter of the flattened vesicle. The flattened vesicle then tips over and concomitantly the plasma-membrane slit becomes curved into a horseshoe-shaped configuration as it extends along the outer margins of the tipped-over vesicle. Some coated pits are present interspersed between the above-mentioned structures, but their numbers appear insufficient to account for an exclusively endocytotic mechanism of membrane recycling. Instead, our micrographs are more consistent with a mixed mode of recycling of membrane components to the cortical endoplamic reticulum and to Golgi cisternae that involves both internalization of membrane by endocytosis and of individual lippid molecules by unknown mechanisms (lipid exchange proteins?). To this end, overall flattening out of the horseshoe-shaped membrane infoldings is accompanied by a retraction and reduction in size of their central, tongue-like structure.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 16
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 328 (1987), S. 379-380 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two-dimensional γ-ray energy correlations have been measured at high spins in1800s with the TESSA2 spectrometer. The Eγ − Eγcorrelation matrix displays ridges characteristic of rotational bands with different energy separations of 96± and 72± keV for the energy regions of 660 to 840 keV and 975 to 1170 keV, respectively. The separation of these ridges remains constant in both energy regions. The dynamical moments of inertia are θ(2) =83±3 and 111±5 ħ2/MeV, respectively. The latter value suggests superdeformation in1800s with an axis ratio c/a=1.76 (β2 ≅0.64) at high spins.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 17
    ISSN: 1434-601X
    Keywords: 21.10.Dr ; 25.70.Cd ; 27.30.+t
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ground-state masses of35Si and34Si have been measured using the reactions64Ni(36S,35,34Si)65,66Zn at a36S beam energy of 198 MeV.34,35Si14+ ions were analysed and identified in a QMG/2 magnetic spectrometer and gas-filled focal-plane detector. The experimental mass excess of35Si was determined to be −14.58± 0.12 0.07 MeV while that of34Si was measured as −19.961±0.034 MeV. A comparison is made with the results of mass model predictions.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Experimental and applied acarology 4 (1988), S. 265-276 
    ISSN: 1572-9702
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Factors inducing outbreaks of spider mites (Acari: Tetranychidae) following use of pyrethroid insecticides are reviewed. Differentials in direct toxicity between spider mites and phytoseiid (Acari: Phytoseiidae) predators provide one explanation. Wide variation exists between pyrethroids in their direct toxicity toTetranychus urticae. The acaricidal action of pyrethroids is largely controlled by the amount of irritancy or repellency induced by the respective chemicals. Laboratory assays for repellency reflect field results. Repellent activity induces spider-mite dispersal to either recolonise plants free of residues or leave the treated habitat. Pyrethroids may also affect reproduction and development rates. Residual activity is likely to vary, so limiting any general theory of spider-mite responses to pyrethroids. Variable responses to pyrethroids, strain variation and development of behavioural resistance also add complications to understanding outbreaks. Future research needs are identified.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 7 (1964), S. 115-119 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Kohlfliege, Hylemyia brassicae (Bouché), wurde vom Ei bis zur Imago auf keimfreiem Kohlrüben-Gewebe gezogen. Insgesamt verpuppten sich 17 aseptische Larven; und die 6 Männchen und 7 Weibchen, die später daraus schlüpften, waren ebenfalls bakterienfrei. Die Larven entwickelten sich nicht auf hitzesterilisiertem Gewebe, oder wenn dieses Gewebe mit fäulniserregenden Bakterien versetzt wurde. Ein Vergleich der Larvalentwicklung auf aseptischen Kohlrüben-Stücken, die mit verschiedenen Arten fäulniserregender Bakterien infiziert waren, zeigt, daß sich die Larven am besten entwickelten, wenn keine Bakterien anwesend waren oder wenn das Kohlrüben-Gewebe nur langsam faulte. Es kamen weniger Larven zur Verpuppung, und die Puparien waren am kleinsten, wenn die Larven mit Kohlrüben-Gewebe ernährt wurden, das infolge Befalls mit Erwinia atroseptica (van Hall) Jennison oder Erwinia carotovora (Jones) Holland rasch faulte. Die Verpuppungs-Prozentsätze der Larven nach Fütterung mit Kohlrüben-Stücken, die mit E. atroseptica, E. carotovora, einer unbekannten Erwinia-Art (die eine langsame Fäulnis verursacht) oder einem Gemisch von E. atroseptica und der Erwinia-Art infiziert waren, sowie in der Kontrolle (ohne Bakterien), betrugen 28, 55, 70, 81, und 75%. Eine unbekannte Erwinia-Art, die durchgängig von verschiedenen Entwicklungsstadien der Kohlfliege von Kohlrüben-Feldern isoliert werden konnte, hemmte die von E. atroseptica ausgelösten Fäulnisprozesse, wenn ein Gemisch der beiden Bakterien in Kohlrüben-Gewebestücke gebracht wurde. Dies vermag zum Teil das geringe Auftreten der Weichfäule auf Kohlrüben-Feldern zu erklären, die von Kohlfliegen befallen sind.
    Notes: Abstract The cabbage maggot, Hylemyia brassicae (Bouché) was reared from egg to adult under aseptic conditions on rutabaga (Swede; Brassica napus napobrassica). No larvae survived either on contaminated or uncontaminated rutabaga plugs sterilized by heat. A comparison of larval development on rutabaga inoculated with several species of decay-producing bacteria showed that larvae developed best on healthy uncontaminated rutabaga tissue or on rutabaga tissue that decayed slowly. Survival was lowest and puparia were smallest when larvae fed on plugs that were decayed rapidly by virulent soft-rot bacteria.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 37 (1985), S. 306-306 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...