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  1. Le phenomene d'heteroblastie chez Les vegetaux: Comment l'expliquer?Cécile Lambert, Roger Buis & Marie-Thérèse L'Hardy-Halos - 1995 - Acta Biotheoretica 43 (1-2):67-80.
    Heteroblastic development is often observed in Cormophytae, but it can also be characterized in Thallophytae as shown by the detailed investigation of the development of the algaAntithamnion plumula (Ceramiaceae, Rhodophyta). In this species, heteroblasty concerns (i) dimensional variables (such as pleuridia length and lateral cladome first tagma length) and (ii) variables that characterize the cell growth kinetics (main axis cells). Apex curvature also varies during ontogenesis.The generality of the property in plants led to search for its origin: apical meristem own (...)
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  • Growth activity and structure at various organization levels in plants.Roger Buis - 1993 - Acta Biotheoretica 41 (3):231-247.
    The growth activity of an organ (variable y) is defined simultaneously by the instantaneous absolute ratedy/dt and its variationd 2y/dt2. The use of these two descriptors allows a sigmoidal (i.e. continuous and non periodical, as observed for the logistic function) growth curve to be discretized into a series of 5 growth states or phases which are delimited by the following singular values: max, Vmax (=0), max, adult stage. The (V, ) plot, termedgrowth trajectory, visualizes, e.g. in the case of Richards-Nelder's (...)
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  • Caracterisation de la structure d'un processus de croissanceCharacterization of the structure of a growth process.Roger Buis, Marie-Thérèse L'Hardy-Halos & Cécile Lambert - 1996 - Acta Biotheoretica 44 (3):359-375.
    L'analyse d'une cinétique de croissance y est conduite à partir du modèle logistique généralisé de Richards-Nelder. On distingue 2 types de processus dits mono- et multi-logistique. Dans le cas mono-logistique, le phénomène est correctement décrit par une seule fonction logistique. La cinétique de croissance est alors caractérisée par lea propriétés de chacune des phases G 1 à G 4, délimitées par les points singuliers Γmax, V max et Γmin. On appelle structure de croissance la contribution relative de ces différentes phases (...)
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