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  • Best. von Cadmium in Bleidioxid, Vanadiumpentoxid, Uranoctoxid  (1)
  • Key words Nestmate recognition  (1)
  • Key words: Honeybees, absconding, arrhenotoky, thelytoky.  (1)
  • 1
    ISSN: 1420-9098
    Keywords: Key words: Honeybees, absconding, arrhenotoky, thelytoky.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary: We investigated absconding frequency and latency in queenright and queenless honeybee colonies in thelytokous Apis mellifera capensis, arrhenotokous Apis mellifera scutellata and their natural thelytokous hybrids. There was no significant difference in frequency of absconding among any of the queenright colonies. Absconding was significantly greater in thelytokous queenless colonies than in the queenless arrhenotokous ones. Latency to absconding did not differ among the three groups of queenright colonies nor between the queenright and queenless colonies of A.m. capensis and A.m. scutellata. There were significant differences in latency between queenright and queenless hybrids and significant differences in latency among the three groups of queenless colonies. Among queenless colonies, A.m. capensis absconded twice as readily as did A. m. scutellata and the hybrids were intermediate. Afterabsconding events include the fates of the absconding colony as well as nestmates left behind. One group of orphaned nestmates of A. m. capensis amalgamated with another queenright colony. In the case of A. m. scutellata either drones were produced or the residual queenless colony was joined by a queenless thelytokous group, subsequently reared a queen and then absconded. Differences in the rate and degree of ovarial development indicate that queenless thelytokous workers have the physiological capacity for reproduction, a trait that contributes to colony fitness.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 279 (1976), S. 337-345 
    ISSN: 1618-2650
    Keywords: Best. von Cadmium in Bleidioxid, Vanadiumpentoxid, Uranoctoxid ; Spektralphotometrie, Atomabsorption ; Laserverdampfung, Rasteranalyse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine flammenlose Methode für die AAS wird beschrieben, die zur Mikro- und Lokalanalyse von Festkörpern eingesetzt werden kann. Die Verdampfung ausgewählter Probenbereiche erfolgt mit einem Ionen-Dauerstrichlaser. Die Cadmiumgehalte in V2O5-, PbO2- und U3O8-Proben, die unterschiedliche Cadmiumkonzentrationen enthalten, werden bestimmt. Die verdampfte Substanzmenge pro Messung beträgt ca. 1 μg, die aus einer Probenfläche von ca. 0,008 mm2 erhalten wird. Die Empfindlichkeit für die Cadmiumbestimmung beträgt 2,1 · 109 g Cd/1% Absorption und die Nachweisgrenze 4,8 · 10−10 g Cd. Als ein Anwendungsbeispiel folgt die Beschreibung und Auswertung einer Mikrorasteranalyse: von einer 14 mm2 Probenfläche wird aus 57 Einzelmeßwerten ein Konzentrationsprofil des Dotierungselementes ermittelt. Dafür werden zwei graphische Darstellungen vorgeschlagen. Vorteile des Verfahrens werden durch Vergleich mit bisher bekannten Techniken erläutert.
    Notes: Abstract A flameless method for AAS is described, which can be used for micro- and local analysis of solid samples. The evaporation of chosen areas of the sample is achieved with a continuous wave ion laser. The evaporated mass of each measurement is about 1 μg, which comes from an area of 0.008 mm2 from the surface of the specimen. The cadmium contents of samples of vanadium, lead and uranium oxides containing different concentrations of cadmium were determined. The sensitivity of the cadmium analysis is 2.1 · 10−9 g of Cd/1% absorption and the detection limit is found to be 4.8 · 10−10 g of cadmium. The description and interpretation of a raster microanalysis as an application of this method follows: 57 point measurements from an area of 14 mm2 are used to construct concentration contours of the doping element. Two graphic representations are suggested. The advantages of this method are compared with other known techniques.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Behavioral ecology and sociobiology 43 (1998), S. 67-72 
    ISSN: 1432-0762
    Keywords: Key words Nestmate recognition ; Kin recognition ; DNA fingerprinting ; Aggression ; Formica ; Relatedness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Genetic relatedness of the mound-building ant Formica pratensis was determined by means of microsatellite DNA polymorphism, and its impact on nestmate recognition was tested in a population in Southern Sweden (Oeland). Recognition between nests was measured by testing aggression levels between single pairs of workers. The genetic distances of nests (Nei's genetic distance) and the spatial distance of nests were correlated and both showed a strong relation to the aggression behavior. Multiple regression analysis revealed a stronger impact of genetic relatedness rather than spatial distances on aggression behavior. Neighbouring nests were more closely related than distant nests, which may reflect budding as a possible spreading mechanism. The genetic distance data showed that nestmate recognition was strongly genetically influenced in F. pratensis.
    Type of Medium: Electronic Resource
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