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  • 1
    ISSN: 1420-9098
    Keywords: Hymenoptera ; social wasps ; sociotomy ; behaviour ; Ropalidia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Females of an Australian polistine wasp,Ropalidia plebeiana, often use their mandibles to cut their nest-comb in spring, dividing it into two or more completely independent nests. Prior to the division, each of the major egg layers, often with some subordinates, tended to occupy a different part of a single comb. These females gnawed cells in the intermediate zone between such “territories”, and ultimately divided the comb. Many other females also built new nests near the nest aggregations, but addition of new nests by comb cutting represented 34.8 % of the increase in nest number. This method of colony fission is so far unknown in any eusocial Hymenoptera.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1420-9098
    Keywords: Ropalidia ; aggregation ; comb reuse ; nest fission ; social behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary InRopalidia plebeiana, combs made in the previous year are often reused by foundresses in the following spring and structurally divided into subnests by them. Close observations of the comb dividing process revealed that: 1) combs that had multiple “brood areas” (areas where cells had eggs) were frequently divided into subnests, while those with single brood areas were never divided; 2) groups of foundresses each occupied a particular brood area even before comb division started; and 3) frequency with which a foundress practiced comb cutting was independent of her social status or oviposition frequency. These observations suggest that the initial grouping of foundresses that colonize an old nest leads to subsequent comb division, rather than the major egg layers cutting combs to safeguard their oviposition territories from their rivals.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 30 (1983), S. 412-415 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung In einer anfänglich sozialen Wespe,Parischnogaster mellyi, werden die Nester von einzelnen Gründerinnen gebaut. Weil die Nester oft verlassen werden, und aber darauf von den anderen Weibchen wiederbesetzen, die Stiefmutter-Stieftochter Assoziationen häufig werden geformt. Einige Töchter bauen ihre eigenen Nester, nachdem sie etwa 20 Tage lang in den Geburtsnester als subordinierte Arbeiterinnen dienen. Die obersten herrschenden Weibchen verlassen selten das Nest und monopolizieren die Eiablage, während die subordinierten alle anderen Arbeiten ausführen.
    Notes: Summary A primitively social wasp,Parischnogaster mellyi founds nests by single foundresses. As nests are often abandoned but soon reoccupied by other females, stepmother-stepdaughter associations are frequently formed. Some daughters found own nests after serving as subordinate workers in the natal nests for about 20 days. Top-dominants rarely leave the nest and probably monopolyze the oviposition, while subordinates take charge of all other tasks.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 30 (1983), S. 416-422 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Le dimorphisme reine/ouvrière est distinct chezRopalidia montana. La taille du corps est significativement différente entre les castes pour les 7 mesures suivantes: largeur de la tête, largeur du mésonotum, longueur du mésosome, longueur et largeur des premier et deuxième tergites du gastre. Il n'y a pas de recoupement de taille entre les reines et les ouvrières pour les mesures suivantes: largeur du premier tergite du gastre et longueur du deuxième tergite du gastre. La ratio reine/ouvrière pour la longueur du mésosome est égale à 1,14. La croissance allométrique chez cette espèce semble être monosphasique.
    Notes: Summary Queen/worker dimorphism is distinct inRopalidia montana. The body size differs significantly between the castes in seven parts measured: Head width, width of mesonotum, alitrunk length, widths and lengths of first and second gastral tergites. There is no size overlap between queens and workers with respect to the width of first gastral tergite and the length of second gastral tergite. Queen/worker ratio of alitrunk length is 1.14. Allometric growth in this species seems to be monophasic.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 60 (1985), S. 200-203 
    ISSN: 1432-1106
    Keywords: End-zone inhibition ; Hypercomplex cells ; Striate cortex ; Cats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The response properties of 96 striate cells in anaesthetized and paralyzed cats were examined by using narrow optimally-oriented light bars moved in the preferred direction at optimal velocity. The bar was lengthened systematically at both ends to plot and analyze bilateral length-response curves. We found a linear relationship between the maximum slope of the inhibitory phase of the curve and the strength of the end-zone inhibition for both cell families: simple and B-cells. This observation indicates that the length of the two end-zones as given by a bilateral length-response curve is approximately constant regardless of the strength of the end-zone inhibition for a change in the strength of the inhibition from 10 to 100%.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 57 (1985), S. 523-536 
    ISSN: 1432-1106
    Keywords: Striate simple cells ; Receptive field organization ; Receptive field subregions ; Subregion direction selectivities
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The response properties of 84 simple striate cells in anaesthetized (N2O/O2 supplemented with sodium pentobarbital) and paralyzed cats were examined quantitatively using narrow optimally oriented light and dark bars moving at optimal velocities. Different cells gave two to five spatially-offset response peaks, the light bar and the dark bar response peaks alternating with one another. With only 5 exceptions, the cells had the same preferred direction for movement of the dark bar as for the light bar. Static-field plots were prepared from 32 of the 84 cells using stationary flashing bars. The receptive fields of different cells had from two to four subregions responding either at light on (ON subregion) or at light off (OFF subregion) although one cell had only a single subregion. In the preferred direction of stimulus movement cells gave either the same number of response peaks to moving bars as there were subregions or one additional response peak. The additional response peak, termed a boundary response, always occurred at the end of the sequence of response peaks and was always completely direction selective. The direction selectivities of the individual response peaks in the responses from 49 of the 84 cells were analyzed. To ensure that each response peak and the corresponding peak in the opposite direction both came from the same subregion, the 49 cells were selected on the basis of having a response in the nonpreferred direction sufficient for analysis and of having a stimulus velocity less than 2.5°/s so as to avoid significant spatial shifts of the peaks due to response latencies. For all but two of the 49 cells, the response peaks in any given profile always showed a progressively greater degree of direction selectivity as the stimulus advanced from one subregion to the next, the first subregion giving the least directionally-selective response peak and the last subregion the most directionally-selective peak. This observation was independent of the direction of stimulus motion and of the particular sequence in which the ON and the OFF subregions were traversed by the stimulus. The response patterns observed experimentally have been correlated with theoretical response patterns based on the responses of lateral geniculate neurons.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Cryobiology 15 (1978), S. 721 
    ISSN: 0011-2240
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Chromatography B: Biomedical Sciences and Applications 579 (1992), S. 25-36 
    ISSN: 0378-4347
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Chromatography B: Biomedical Sciences and Applications 652 (1994), S. 123-136 
    ISSN: 0378-4347
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0027-5107
    Keywords: Benzo[a]pyrene ; Chlorophyllin antimutagenicity
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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