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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 219 (1968), S. 513-515 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have already shown1 that the operculum is by no means uniform in structure or development throughout the genus. There is a large group of species in which the perianth whorls are separate from each other and form two opercula which fit one over the other. Both caps are deciduous, the inner one ...
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 210 (1966), S. 185-186 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE presence or absence of stipules is one of the most J[ consistent of the vegetative characters used by angio-sperm taxonomists and has considerable importance in both classification and identification of flowering plants. Unfortunately, much of the information in the standard works in English is ...
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 124 (1985), S. 205-212 
    ISSN: 1615-6102
    Keywords: Epicuticular wax ; Patterns ; Prepatterns ; Leaf anatomy ; Stomata ; Eucalyptus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Patterns of arrangement of epicuticular wax platelets are shown in a number of species ofEucalytpus. In some, wax platelets are oriented across the long axes of epidermal cells overlying veins and, in some species, over cells of adjacent stomatal complexes. Among other patterns, radial arrangements around stomata, arrangements in lines at right angles to underlying cell walls and concentric arrays are described. The possibility of the involvement of ectodesmata (ectocythodes) in the location of wax platelets is raised. The pattern of orientation of the platelets is ascribed to a “prepattern”, as yet unobserved, of anisotropic domains in the outer cuticle. It is suggested that this prepattern may consist of regions of molecular anisotropy possibly produced in response to stretching of the cuticle during expansion growth. Wax platelet patterns appear to be restricted to certain taxonomic entities; thus, genetical determinants are also involved in their formation.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 102 (1980), S. 177-182 
    ISSN: 1615-6102
    Keywords: Leaf anatomy ; Pectic strands ; Stomata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Pectic strands are shown to connect the lower stomatal ledges and to develop across the posterior chamber of a number of plant species. Similar strands are formed between guard cells and subsidiary cells, and between epidermal cells.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 104 (1980), S. 239-251 
    ISSN: 1615-6102
    Keywords: Eucalyptus ; Stomata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary This paper describes variations of a mode of stomatal development already described in a species (E. orbifolia) ofEucalyptus L'Herit. (Carr andCarr, Protoplasma 96, 127, 1978) in which the outer part of the stomatal pore (“ostiole”) is formed by the creation of a break in the thin layer of cuticle lying over the stomatal chamber. In a number of species with a thick cuticle (e.g., E. cooperana) the process of breakthrough is different: additions to the guard cell upper thickenings extend from them as ridges, pressing the leaf cuticle outwards. Breakthrough of the cuticle occurs above the tips of these extensions. The anterior chamber is lined throughout by the extensions, which become heavily cutinized. This mode of stomatal development is typical of many other species of eucalypts, including those dealt with in this paper. In addition, inE. halophila thickenings develop on the end walls of the anterior chamber above the unusual upturned poles of the guard cells. Cutinized thickenings, “pseudo-outer stomatal ledges” are also formed on the upper guard cell walls. All these wall thickenings occlude the anterior chamber, leaving only a narrow passage in the form of a letter “H”. Similar occlusions are found inE. balladoniensis but here the thickenings are developed into the chamber from its lateral walls. InE. gracilis, and the related speciesE. celastroides andE. calycogona, less regular occluding thickenings develop principally from the lateral walls of the chamber. In addition, large pseudo-outer stomatal ledges may be formed. These phenomena are discussed in terms of the mechanism underlying the formation of the occluding thickenings and the possibility of their adaptive significance.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 96 (1978), S. 127-148 
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Development of the stomata ofEucalyptus orbifolia (in which they are relatively superficial) andE. incrassata (in which they are deeply sunken) is described from light microscopy of thin sections of resin-embedded material. The envelope of the guard mother cell is retained intact while in the daughter cells (guard cells) the inner and outer thickenings are formed. The mother cell envelope may even remain discrete and intact during early stages of formation of the separation spaces, precursors of the future stomatal pore, between the thickenings. Remnants of the guard mother cell wall may be retained as parts of at least the inner stomatal ledges. Likewise, remnants of the wall which divides the mother cell persist on the maturing guard cells. Sudan III-positive materials, probably cutin, are removed from the cuticle over the mother cell soon after it is formed. The cuticle above the guard cell is finally perforated by enzymic attack forming, inE. incrassata, a large cavity outside the developing stoma into which the outer stomatal ledges grow as extensions of the upper guard cell walls. The termostiole is suggested for the aperture in the cuticle. The flanges of cuticle seen in section to bound it are termedostiolar ledges. The ostiolar ledges are to be distinguished from the outer stomatal ledges, which develop from the upper thickenings of the guard cell initials. The distinction is clear inE. incrassata (and other species with deeply sunken stomata) but not in mesophytic plants or species with superficial stomata such asE. orbifolia in which the outer stomatal ledges are fused with the cuticle. Growth of the outer stomatal ledges inE. incrassata involves transport of wall materials through an annular space, the equivalent of an ectocythode. The relevance of the observations to stomatal development in other genera is discussed.
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 8 (1955), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 6 (1953), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 23 (1970), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Seed development in Pisum arvense L. cv. New Zealand Maple has been studied in relation to changes in level of total endogenous cytokinins. Growth of both the whole seed and the embryo is diauxic, having two phases of active growth separated by a lag period. The two maxima in the growth rates of the whole seed and the embryo occur about the 23rd and 31st days after anthesis. The lag period occurs between days 26 and 28. Cell division is thought to have ceased prior to day 19 and the changes in total cytokinin content in pea seeds after this time are believed to be largely independent of cell division. The three maxima in the cylokinin content per gm. fresh weight of seed and per seed were found to be coincident with the maximum volume of endosperm per seed and the two maxima in the growth rates of the whole seed and the embryo.
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 5 (1952), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
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