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  • Key words: Honeybees, absconding, arrhenotoky, thelytoky.  (1)
  • Surgery planning  (1)
  • 1995-1999  (2)
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  • 1995-1999  (2)
Year
  • 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
    ISSN: 1434-9957
    Keywords: Surgery planning ; Volume segmentation ; Virtual tools ; Force feedback ; Intra-operative navigation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract The primary goal of our research has been to implement an entirely computer-based maxillofacial surgery planning system [1]. An important step toward this goal is to make virtual tools available to the surgeon in order to carry out a three-dimensional (3D) cephalometrical analysis and to interactively define bone segments from skull and jaw bones. An easy-to-handle user interface employs visual and force-feedback devices to define subvolumes of a patient's volume dataset [2]. The defined subvolumes, together with their spatial arrangements based on the cephalometrical results, eventually lead to an operation plan. We have evaluated modern low-cost, force-feedback devices with regard to their ability to emulate the surgeon's working procedure. Once the planning of the procedure is complete, the planning results are transferred to the operating room. In our intra-operative concept the visualisation of planning data is speech controlled by the surgeon and correlated with the patient's position by an electromagnetic 3D sensor system.
    Type of Medium: Electronic Resource
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