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  • 1
    Electronic Resource
    Electronic Resource
    Molecular phylogeny ofBrachycome (Asteraceae) (1999)
    Springer
    Plant systematics and evolution 217 (1999), S. 299-311 
    Details
    ISSN: 1615-6110
    Keywords: Asteraceae ; Astereae ; Brachycome ; Australia ; chloroplast DNA ; matK ; fruit morphology ; chromosome number
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Intrageneric relationships in the genusBrachycome were investigated by the comparison of nucleotide sequences of the chloroplast genematK. Evolutionary trends of some morphological and cytological characters were estimated based on thematK tree. The results indicate thatBrachycome is divided into four major clades, and circumscription of superspecies based primarily on fruit morphology is not fully supported. Fruit morphology has evolved in parallel from simple to complex structures in several lineages. The ancestral basic chromosome number isx = 9, and lower chromosome numbers are the products of several dysploid reductions fromn = 9 in two of four major clades ofBrachycome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984372
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Adaptive locomotion to periodic perturbation. Adaptation mechanism with coupling of oscillator and link dynamics (1999)
    Springer
    Artificial life and robotics 3 (1999), S. 97-101 
    Details
    ISSN: 1614-7456
    Keywords: Quadrupedal locomotion ; Gait pattern ; Adaptation ; Periodic perturbation ; Coupled oscillators ; Limb dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Quadrupeds can acquire new gait patterns with respect to environmental changes. Yanagihara et al. have demonstrated this adaptability by experiments on a decerebrate cat. These experiments indicate that quadrupeds gradually adapt to their environment by repeating locomotion in a steady environment, and that the acquired gait pattern is persistently memorized after the locomotion. Our research aims at formulating a mathematical model of these cats' behavior and constructing a quadrupedal walking robot to realize such adaptive behavior. To date, we have proposed a mathematical description of adaptation at the level of gait pattern generation using neural oscillators. In this paper, we extend it to take into account limb dynamics. We study how to design the interaction of the oscillator and limb dynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02481254
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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