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  • Air temperature  (1)
  • Compartment  (1)
  • 1
    ISSN: 1573-5052
    Keywords: Air temperature ; Edaphic moisture ; Fagus sylvatica ; Forest micrometeorology ; Meteorological station ; P.A.R. ; Photoperiodicity ; Quercus pyrenaica ; Relative humidity ; Tree foliation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We compared the flowering and fruiting phenology of Symphytum tuberosum L. (Boraginaceae), Hyacinthoides non-scripta (L.) Chouard (Liliaceae) and Melittis melissophyllum L. (Labiatae) in a beech wood and an oak wood situated in the same valley, taking into account their different microclimatic and edaphic characteristics and carrying out correlation and simple regression analyses. Differences observed in the phenological cycles of the species studied included earlier flowering and longer cycles in the oak wood, except for H. non-scripta. The most important climatic factors were soil moisture and the relative humidity, followed by temperature and the number of daylight hours and photosynthetically active radiation (P.A.R.). The M. melissophyllum cycle depended mainly on water availability, H. non-scripta on solar radiation, soil moisture and a temperature threshold value, while no specific climatic parameter was found to affect S. tuberosum. Temperature was found to be less important than previously believed as it seems only to correlate with S. tuberosum flowering. The strong correlation observed in the fruiting of the three species indicated clear synchronization.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-041X
    Keywords: Key words Drosophila ; Genital disc ; engrailed ; Compartment ; Homeotic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The genital disc of Drosophila, which gives rise to the genitalia and analia of adult flies, is formed by cells from different embryonic segments. To study the organization of this disc, the expressions of segment polarity and homeotic genes were investigated. The organization of the embryonic genital primordium and the requirement of the engrailed and invected genes in the adult terminalia were also analysed. The results show that the three primordia, the female and male genitalia plus the analia, are composed of an anterior and a posterior compartment. In some aspects, each of the three primordia resemble other discs: the expression of genes such as wingless and decapentaplegic in each anterior compartment is similar to that seen in leg discs, and the absence of engrailed and invected cause duplications of anterior regions, as occurs in wing discs. The absence of lineage restrictions in some regions of the terminalia and the expression of segment polarity genes in the embryonic genital disc suggest that this model of compartmental organization evolves, at least in part, as the disc grows. The expression of homeotic genes suggests a parasegmental organization of the genital disc, although these genes may also change their expression patterns during larval development.
    Type of Medium: Electronic Resource
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