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  • 1
    Electronic Resource
    Electronic Resource
    Relationship between the number and function of human ribosomal genes (1988)
    Springer
    Human genetics 〈Berlin〉 79 (1988), S. 301-304 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The relative number of ribosomal RNA genes of the acrocentric chromosomes in one individual was measured by counting grains after in situ hybridization of 3H-labeled human 18S rDNA to fixed metaphase chromosomes. The relative amount of ribosomal RNA gene activity of each of the same chromosomes was estimated by determining the frequency with which the chromosome's nucleolus organizer region (NOR) was silver stained, the size of the silver-stained region, and how often the chromosome was found in satellite association. Results were similar in phytohemagglutinin-stimulated T-lymphocytes, Epstein-Barr virus transformed lymphoblasts, and fibroblasts. One chromosome 21 had few gene copies and low activity. One chromosome 22 had many gene copies but low activity. Both chromosomes 14 had few gene copies but high activity. The level of expression that can be achieved by rRNA gene clusters can, therefore, be determined by factors other than the number of gene copies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282165
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Comparative effects of four mycorrhizal fungi on loblolly pine seedlings growing in a greenhouse in a Piedmont soil (1985)
    Springer
    Plant and soil 83 (1985), S. 215-221 
    Details
    ISSN: 1573-5036
    Keywords: Cecil soil type ; Phosphorus ; Pinus taeda ; Scleroderma aurantium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A greenhouse study was conducted to evaluate the effect of ectomycorrhizae on loblolly pine (Pinus taeda L.) growing in a Piedmont soil. Pine seedlings were inoculated with one of four species of fungi (Scleroderma aurantium, Pisolithus tinctorius, Thelophora terrestris, andRhizopogon roseolus). The seedlings were grown in pots containing a Cecil sandy clay loam amended to create a gradient of extractable P ranging from 5.9 to 52.5 μg/g. After ten months, all colonized seedlings were significantly larger than control seedlings. However, of the four fungi,Scleroderma aurantium mediated a far superior shoot growth response to increasing levels of soil P; the seedlings were significantly larger than those colonized by any other fungus and also had the largest root systems and greatest degree of mycorrhizal colonization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184293
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Genome composition and tandemly repetitive sequence at some centromeres in the lizard Podarcis s. sicula Raf. (1989)
    Springer
    Genetica 79 (1989), S. 85-91 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A detailed study on the genome of the lizard P. sicula has been carried out using restriction enzyme analysis followed by identification and cloning of a repetitive DNA fraction. The results show that P. sicula generally possesses a quite homogeneous genome composition, with a single tandemly repetitive sequence family that is easily visualized after digestion of genomic DNA with Taq I. The cloned repeating unit of this satellite (260 bp) has been designed pLCSl. In-situ hybridisation shows that this satellite is localized in the centromeric region. Dot blot experiments show that sequences similar to pLCSl are present in other species of the same family of lizards.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00057925
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    Paper (German National Licenses)
    Fulltext
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