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  • 1
    Electronic Resource
    Electronic Resource
    Individual involvement in queen-attending of worker honeybees (1992)
    Springer
    Insectes sociaux 39 (1992), S. 237-249 
    Details
    ISSN: 1420-9098
    Keywords: Individual variation ; honeybees ; division of labour ; specialism ; random distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Studies on the division of labour in honeybees have mainly been focused on behaviour that is performed by workers of different ages or genetic background. However, little is yet known about behavioural differenceswithin groups of honeybee workers. The aim of this paper is to establish whether queen attendance in honeybee colonies is a function of “specialists” among the workers within one age cohort in colonies with a natural number of partilines. Furthermore, I want to assess whether the duration of contact of individual workers with the queen is correlated with their involvement in other behaviour and, in the long term, with their differentiation into laying and non-laying workers after the colony becomes queenless. The individual involvement in queen attendance was studied by investigation of three parameters: the number of separate bouts of performing the behaviour the total duration of queen-worker contact the constancy of the relative individual involvement. I hardly found any indications that there is a significance differentiation for queen attendance. A distinction was made between different behavioural acts of the workers in the court: antennating the queen licking of the queen's body donating food to the queen. The latter two behaviours were performed mostly by bees who had been in the court already for some time. Licking by workers has the effect that the probability of the queen walking away is reduced. Consequently, the queen stays motionless for a longer period of time than usual. No correlations were found between frequencies of queen attendance and frequencies of other behaviours. The amount of time the workers spent in contact with the queen did not seem to affect their future chances of becoming egg-laying workers after the queen was removed from the hive. Since there was neither differentiation in the frequency of queen attending, nor any significant correlations with other worker behaviour, participation in the queen's court seems to follow a completely random pattern.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01323945
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  • 2
    Electronic Resource
    Electronic Resource
    Individual differentiation in behaviour of honey bee workers (Apis meltifera L.) (1993)
    Springer
    Insectes sociaux 40 (1993), S. 345-361 
    Details
    ISSN: 1420-9098
    Keywords: Division of labour ; individual differentiation ; idiosyncrasy ; social organisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Behavioural differentiation in honey bee workers has been the most important issue in papers on honey bee behaviour throughout the years. However, little is yet known about proximate factors leading to behavioural differentiation within worker honey bees of the same age group (idiosyncrasy). Although recently there have been many publications concerning the influence of genetic and physiological factors on worker behaviour, these factors do not provide proximate clues at the level of an individual. The aim of this paper is to describe behavioural differentiation within one age group of honey bee workers. These descriptions for more or less normal situations are necessary in order to make investigations with respect to the proximate factors leading to idiosyncrasy possible. Various methods have to be employed to describe and quantify these differences. The analysis of frequency distributions of involvement in a behaviour alone is usually not enough for this purpose. Significant idiosyncrasy has been found for “comb construction”, “allogrooming” and some behavioural acts which occur in queenless colonies: “involvement in aggressive interactions” (both as “aggressor” and as “victim”) and “staying in empty cells”. The distribution of the number of times workers were allogroomed never deviated from random distributions. Also workers' “involvement in visiting larvae in emergency queen cells” was mostly random.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01253898
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  • 3
    Electronic Resource
    Electronic Resource
    The construction of a simultaneous functional order in nervous systems (1987)
    Springer
    Biological cybernetics 57 (1987), S. 331-340 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract In a previous paper (Part I) we introduced a model that constructs a simultaneous functional order in a set of neuronal elements by monitoring the coincidences in their signal activities (the so-called coincidence-model). The simultaneous signal activity in a neural net will be constrained both by its physical restrictions and by environmental constraints. In this paper we present the results of simulation experiments that were performed to study the influence of environmental constraits on the resulting functional order in a set of neural elements corresponding to a onedimensional detector array. We show that the coincidence-model produces a functional order that encodes the physical constraints of the environment. Moreover, we demonstrate that the signal activity in the neural net (the “perceptions”) can be related to events in the outer world. We provide some examples to demonstrate that our model may prove useful to gain insight into certain developmental disorders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338825
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  • 4
    Electronic Resource
    Electronic Resource
    Spatial variability of earthworm populations in a permanent polder grassland (1992)
    Springer
    Biology and fertility of soils 14 (1992), S. 260-266 
    Details
    ISSN: 1432-0789
    Keywords: Earthworm activity ; Geostatistics ; Dispersal rate ; Spatial variability ; Land reclamation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary We studied the earthworm distribution in a permanent polder grassland by making two detailed surveys in 1983 and in 1990. Geostatistical procedures were used to investigate the changes in species composition and to determine the dispersal rate. Attention was focused on two soil survey variables closely related to earth-worm distribution, the thickness of the Ah horizon and the number of burrows. The dispersal rate between the two survey dates was 13 m year−1 compared with 10 m year−1 before 1983. The difference was attributed either to the development of new population centres due to dispersal by cow's feet or tractor wheels, this altering the spatial dynamics, or to a lag phase in population development in the years following inoculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395461
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  • 5
    Electronic Resource
    Electronic Resource
    The construction of a simultaneous functional order in nervous systems (1987)
    Springer
    Biological cybernetics 57 (1987), S. 127-136 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract The functional order of a collection of nervous elements is available to the system itself, as opposed to the anatomical geometrical order which exists only for external observers. It has been shown before (Part I) that covariances or coincidences in the signal activity of a neural net can be used in the construction of a simultaneous functional order in which a modality is represented as a concatenation of districts with a lattice structure. In this paper we will show how the resulting functional order in a nervous net can be related to the geometry of the underlying detector array. In particular, we will present an algorithm to construct an abstract geometrical complex from this functional order. The algebraic structure of this complex reflects the topological and geometrical structure of the underlying detector array. We will show how the activated subcomplexes of a complex can be related to segments of the detector array that are activated by the projection of a stimulus pattern. The homology of an abstract complex (and therefore of all of its subcomplexes) can be obtained from simple combinatioral operations on its coincidence scheme. Thus, both the geometry of a detector array and the topology of projections of stimulus patterns may have an objective existence for the neural system itself.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318722
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  • 6
    Electronic Resource
    Electronic Resource
    The construction of a simultaneous functional order in nervous systems (1988)
    Springer
    Biological cybernetics 58 (1988), S. 275-286 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract The signal activity in a neural net will be constrained both by its physical structure and by environmental constraints. By monitoring its signal activity a neural system can build up a simultaneous functional order that encodes these constraints. We have previously (Part I) presented two models that construct a simultaneous functional order in a collection of neural elements using either signal-covariances or signal-coincides. In this paper we present the results of simulation experiments that were performed to study the influence of the physical constraints of a neural system on the simultaneous functional order produced by both models. In the simulation experiments we used a one-dimensional detector array. We delineate the physical constraints such an array has to satisfy in order to induce a functional order relation that allows an isomorphism with a geometrical order. We show that for an appropriate choice of the system parameters both models can produce a simultaneous functional order with sufficient internal coherence to allow isomorphisms with a triangulation. In this case the dimensionality and the coherence of the detector array are objectively available to the system itself.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00364132
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  • 7
    Electronic Resource
    Electronic Resource
    Does kin recognition in honey bees, Apis mellifera L., influence the workers' chances of becoming egg layers?
    Amsterdam : Elsevier
    Animal Behaviour 42 (1991), S. 867-870 
    Details
    ISSN: 0003-3472
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0003-3472(05)80136-8
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  • 8
    Electronic Resource
    Electronic Resource
    Does kin recognition in honey bees, Apis mellifera L., influence the workers' chances of becoming egg layers?
    Amsterdam : Elsevier
    Animal Behaviour 42 (1991), S. 867-870 
    Details
    ISSN: 0003-3472
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0003-3472(05)80136-8
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  • 9
    Electronic Resource
    Electronic Resource
    Identification of the essential yeast protein MIM17, an integral mitochondrial inner membrane protein involved in protein import
    Amsterdam : Elsevier
    FEBS Letters 349 (1994), S. 215-221 
    Details
    ISSN: 0014-5793
    Keywords: MIM17 ; Mitochondrial inner membrane ; Preprotein ; Protein translocation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(94)00669-5
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  • 10
    Electronic Resource
    Electronic Resource
    The polytopic mitochondrial inner membrane proteins MIM17 and MIM23 operate at the same preprotein import site
    Amsterdam : Elsevier
    FEBS Letters 349 (1994), S. 222-228 
    Details
    ISSN: 0014-5793
    Keywords: MIM17 ; MIM23 ; MIM44 ; Mitochondrion ; Protein translocation ; hsp70
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(94)00670-9
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