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  • 1
    Publication Date: 2019-01-21
    Type: report
    Format: application/pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1824-3096
    Keywords: Dermatoglyphics ; Bushmen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Analysis of the dermatoglyphics of a sample of Kung Bushmen living in the Kalahari of north-east Namibia is presented, and the results are compared with those of other Bushmen studies. A high frequency of arches, a low ridge count, and high frequencies of pattern reduction forms, appear characteristic.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International journal of anthropology 11 (1996), S. 185-191 
    ISSN: 1824-3096
    Keywords: Demographic data in anthropology ; energy cycle ; genetic structure and evolution of human population
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract As a conclusion, this paper reviews briefly the content of the volume. The wealth of demographic data has not been adequately exploited in anthropology; this is why this publication is valuable in showing attempts to apply demographic data in a variety of anthropological problems. This symposium has explored many interesting points which we recall here. Yet it has also opened up a whole range of further questions on the material presented as well as in this broad field. Several directions of research could be developed, for instance, testing among human populations, over long periods, the ecological thoughts of ecosystems evolving as a cascade of instabilities, rather than a succession of equilibrium states. Let us also recall the pervasive nature of demographic facts in topics such as the energy cycle or the genetic structure and evolution of human populations.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A model is developed for the strength degradation of brittle surfaces in sliding contact with spherical indenters. The loss of strength is associated with the propagation of partial cone cracks in the wake of the indenter. Detailed fracture mechanics calculations are circumvented by working in the limit of ideal point-load contacts, with the key proposition that the crack dimensions remain insensitive to rotations of the cone axis relative to the specimen free surface. In this way the simple Roesler solution for classical, well-developed cone cracks may be retained as a convenient “reference state” for a more general theoretical description, whereby the superposition of a tangential friction force onto the normal loading is accommodated via a straightforward coordinate transformation operation. The major predictions of the model are tested by measuring the strengths of glass surfaces after contact with a sliding steel sphere. In particular, the degraded strengths are not strongly influenced by the coefficient of friction, contrary to expectations from some earlier indentation analyses.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1615-6102
    Keywords: Calcium ; Calmodulin ; Appressorium formation ; Zoophthora radicans ; Entomopathogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The fungusZoophthora radicans (Zygomycetes: Entomophthorales) requires external Ca2+ for appressorium formation but not for conidial germination. The number of appressoria formed depends on the Ca2+ concentration of the medium. At low [Ca2+] (100 pM) nuclear division and germ tube growth are significantly reduced compared to higher Ca2+ concentrations (10 and 1,000 μM). By contrast, neither external K+ nor external Cl− is needed for germination or appressorium formation. Treatment of conidia with a Ca2+-antagonist, Nd3+, and a Ca2+-channel blocker, nifedipine, inhibits appressorium formation, showing that a Ca2+ influx is required for appressorium formation. Furthermore, the partial yet saturating inhibition by nifedipine and complete inhibition by Nd3+ indicates that at least two kinds of Ca2+ channels are involved in appressorium formation. A contribution of intracellular Ca2+ to the signal transduction chain for the formation of appressoria is demonstrated by the inhibitory effect of the intracellular Ca2+ antagonist TMB-8. The calmodulin antagonists R24571, TFP, W-7, and W-5 inhibit appressorium formation at concentrations which have no effect on germination. The data presented in this paper are consistent with the hypothesis that a Ca2+/calmodulin system is involved in regulating appressorium formation. However, since the direct effects of the drugs were not specifically tested on their proposed binding sites, we leave room for alternative hypotheses that have yet to be formulated.
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  • 6
    ISSN: 1573-8248
    Keywords: Beauveria bassiana ; marcescent process ; mass production ; fermenter ; dry mycelium ; conidiation ; Beauveria bassiana ; production de masse ; fermenteur ; mycélium sec ; production de conidies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Le mycélium deBeauveria bassiana peut être développé en milieu liquide, filtré et le mycélium séché. Après réhydratation, le mycélium sporule. Deux sources d'hydrates de carbone (sucrose et maltose) et une source azote/vitamine (extrait de levure) furent essayées pour la croissance du mycélium et la production consécutive de conidies. La croissance maximale du mycélium (12,31 mg/ml) en culture liquide, intervenait dans un milieu: sucrose (3,5%)/extrait de levure (3,5%), mais le mycélium issu d'un milieu maltose (2%)/extrait de levure (0.75%) produisait le maximum de 4,62×106 conidies/mg de mycélium sec après incubation en boîtes humides de Pétri. En utilisant les données sur la production de mycélium (en culture liquide) et sur celle de conidies (par le mycélium sec), on a calculé que les milieux sucrose (3,5%)/extrait de levure (3,5%) et maltose (2%)/extrait de levure (0,75%) produisaient la plus grande quantité de conidies par volume de milieu (l'équivalent de 3,52–3,72×107 conidies/ml).
    Notes: Abstract Mycelium ofBeauveria bassiana can be grown in liquid culture, filtered, and the mycelium dried. After rehydration the mycelium sporulates. Two carbohydrate sources (sucrose and maltose), and one nitrogen/vitamin source (yeast extract) were tested for mycelium growth and subsequent conidial production. Maximum mycelium growth (12.31 mg/ml), in liquid culture, was in the sucrose (3.5%)/yeast extract (3.5%) medium, but mycelium from a maltose (2%)/yeast extract (0.75%) medium produced the maximum of 4.62×106 conidia/mg dry mycelium after incubation in moist Petri dishes. Using the data on mycelium yield (in liquid culture) and conidial production (by dry mycelium) it is calculated that the sucrose (3.5%)/yeast extract (3.5%) and the maltose (2%)/yeast extract (0.75%) media produce most conidia per media volume (an equivalent of 3.52–3.72×107 conidia/ml).
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  • 7
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    Baltimore : Periodicals Archive Online (PAO)
    Human Biology. 34:1 (1962:Feb.) 20 
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  • 9
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    Baltimore : Periodicals Archive Online (PAO)
    Human Biology. 55:2 (1983:May) 341 
    ISSN: 0018-7143
    Topics: Biology
    Description / Table of Contents: COMMONALITY OF SURNAMES BETWEEN GROUPS AS A MEASURE OF POPULATION STRUCTURE
    Notes: SURNAMES AS MARKERS OF INBREEDING AND MIGRATION
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Trees 12 (1998), S. 315-325 
    ISSN: 0931-1890
    Keywords: Key words Leaf age ; Aldina heterophylla ; Amazon ; Remote sensing ; Caatinga
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Significant gaps exist in the knowledge of tropical leaf spectra and the manner in which spectra change as leaves age in their natural environment. Leaf aging effects may be particularly important in tropical vegetation growing on nutrient poor soils, such as Amazon caatinga, a white sand community common in the Amazon Basin. Spectral changes observed in six caatinga dominants include decreased reflectance and transmittance and increased absorptance for epiphyll-coated older leaves. Near-infrared (NIR) changes were most significant. More detailed spectral and physical changes were studied in one dominant, Aldina heterophylla. Over 16 months, Aldina study plants produced one or two leaf flushes. During leaf expansion, leaf water content and Specific Leaf Area decreased rapidly. Over the first 6 months spectral changes occurred across the spectrum, resulting in decreased transmittance and increased absorptance in the visible and NIR and decreased visible and increased NIR reflectance. In contrast, significant spectral changes were restricted to the NIR over the last 9 months, which showed a 10% absorptance increase associated primarily with increasing epiphylls and necrosis. At the canopy scale, increased NIR absorptance provides a mechanism for producing seasonally varying forest albedo and changing NIR to red ratios, independent of changes in other canopy attributes. In the Amazon caatinga studied, all canopy dominants were subject to epiphyllic growth providing a mechanism for distinguishing these forest types spectrally from more diverse terra-firme forest or forest types with more rapid leaf turnover, such as second growth. These changes are observable using remote sensing and could be used to map caatinga and monitor interannual or seasonal variability in phenology. If these results can be extended to other communities with long-lived foliage, they may offer a means for mapping vegetation on the basis of leaf longevity.
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