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  • 1
    Electronic Resource
    Electronic Resource
    Electron paramagnetic resonance and electron nuclear double resonance spectroscopies of the radical site in galactose oxidase and of thioether-substituted phenol model compounds (1992)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 114 (1992), S. 3727-3734 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00036a023
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Differentiation of histospecific ultrastructural features in cells of cleavage-arrested early ascidian embryos (1984)
    Springer
    Development genes and evolution 194 (1984), S. 87-98 
    Details
    ISSN: 1432-041X
    Keywords: Cell differentiation ; Cytochalasin B ; Urochordata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Ultrastructural features of histospecific differentiation were found in early cleavage stage ascidian embryos treated with cytochalasin B and held thereby in cleavagearrest until hatching time. Markers characteristic of tissue differentiation during normal embryonic and larval stages ofCiona intestinalis were expressed in muscle and two brain cell lineages of cleavage-arrested whole embryos and in epidermal and notochordal cell lineages of cleavage-arrested partial embryos. These features were muscle myofilaments and myofibrils, melanosomes of the brain pigment cells, cilium-derived structures present in a “proprioceptive” brain cell, extracellular test material of epidermal cell origin, and the sheath filaments, membrane leaflets, and vacuolar colloid associated with notochord cells. All of these ultrastructural markers of differentiation were blocked in their development by treatment of gastrula stage embryos with actinomycin D, an inhibitor of RNA synthesis, and presumably result from the expression of new gene activity. At the time of cleavage-arrest the five cell lineages studies still contained two or more unsegregated lineage pathways. Subsequent developmental autonomy within the lineages is consistent with the hypothesis of segregation during early development of functionally independent gene regulatory factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848348
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  • 3
    Electronic Resource
    Electronic Resource
    Impaired insulin binding to isolated adipocytes in experimental diabetic ketoacidosis (1981)
    Springer
    Diabetologia 21 (1981), S. 563-568 
    Details
    ISSN: 1432-0428
    Keywords: Diabetes ; streptozotocin ; rats ; diabetic ketoacidosis ; insulin receptors ; insulin sensitivity ; insulin resistance ; Scatchard analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Insulin sensitivity in vivo and insulin binding in vitro to adipocytes have been studied in streptozotocin diabetic rats with ketoacidosis. Insulin sensitivity in vivo measured as the acute (20 min) fall in blood glucose in response to an insulin infusion of 1 U/kg body weight per hour correlated positively with arterial blood pH (r=0.92, p 〈 0.01: n=38). At pH 〈 6.9 there was no fall in blood glucose. For studies of insulin binding to adipocytes ketoacidotic animals were divided into a group with moderate ketoacidosis (pH 〉 7.0) and a second group with severe ketoacidosis (pH 〈 6.9). Insulin binding to adipocytes was maximal in cells from both ketoacidotic and from normal rats at pH 7.6–7.8. Total binding was decreased in the diabetic rats (p 〈 0.01) and this was more marked in the severely diabetic group (p 〈 0.001) at all pHs studied. At pH 7.4, 125I-insulin binding was decreased in diabetics compared with normal rats (0.89±0.14 versus 2.0±0.24% with 2×105 cells/ml: n=6; p 〈 0.01) and also in the severe compared with the moderate ketoacidotic rats (0.5± 0.08%/2×105 cells; n=6, p 〈 0.05). Equilibrium binding studies showed that there was a small decrease in apparent affinity in adipocytes from both groups of diabetics (KD = 2.8±0.2×10-9 mol/l, n =6 in moderate ketoacidosis; 2.5±0.3×10-9 mol/l, n=6 in severe ketoacidosis) compared with control animals (KD = 1.8±0.15×10-9 mol/l, n= 6). Scatchard analysis revealed that there was also a decrease in receptor concentration which was greater in the severely ketoacidotic group. These findings may explain in part the insulin resistance of severe ketoacidosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00281550
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  • 4
    Electronic Resource
    Electronic Resource
    Existence of competitive equilibrium when incomes may be zero (1996)
    Springer
    Economic theory 8 (1996), S. 177-182 
    Details
    ISSN: 1432-0479
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Summary In a pure exchange economy, there exists a price vector which is a quasi-equilibrium (Debreu 1962), but this may not be a competitive equilibrium if some individuals' demand functions are discontinuous because their incomes may be zero. We show nonetheless, in a pure exchange economy with free disposal, that there is asequence of prices approaching the quasi-equilibrium along which total excess demands tend to a non-positive limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01212019
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  • 5
    Electronic Resource
    Electronic Resource
    Existence of competitive equilibrium when incomes may be zero (1996)
    Springer
    Economic theory 8 (1996), S. 177-182 
    Details
    ISSN: 1432-0479
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Summary.  In a pure exchange economy, there exists a price vector which is a quasi-equilibrium (Debreu 1962), but this may not be a competitive equilibrium if some individuals’ demand functions are discontinuous because their incomes may be zero. We show nonetheless, in a pure exchange economy with free disposal, that there is a sequence of prices approaching the quasi-equilibrium along which total excess demands tend to a non-positive limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01212019
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of collembolan grazing on fungal activity in differently managed upland pastures: A microcosm study (1993)
    Springer
    Biology and fertility of soils 16 (1993), S. 255-262 
    Details
    ISSN: 1432-0789
    Keywords: Fungal biomass ; Respiration ; Nutrient cycling ; Microcosms ; Grass litter ; Onychiurus procampatus ; Phoma exigua ; Collembola
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Laboratory microcosms containing litter from three tussock grasslands were used to assess the impact of grazing by a collembolan, Onychiurus procampatus, on the abundance, nutrient release, and respiration of the saprotrophic fungus, Phoma exigua. The fungal biomass and respiration rate were significantly reduced only when Collembola were present in excess of mean field densities but perhaps more typical of spatial aggregations in the soil. A high efficiency of nutrient immobilization by P. exigua was demonstrated but nutrient release was not significantly affected by the fauna. Problems associated with the use of microcosms in the simulation of field conditions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369301
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  • 7
    Electronic Resource
    Electronic Resource
    The diet and food preferences of Onychiurus procampatus (Collembola) from upland grassland soils (1993)
    Springer
    Biology and fertility of soils 16 (1993), S. 296-298 
    Details
    ISSN: 1432-0789
    Keywords: Collembola ; Food preferences ; Grassland ; Fungi ; Gut contents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Specimens of Onychiurus procampatus (Collembola) observed grazing on fungal mycelia were collected from the surface soil of three differently manged upland grasslands. A general trend of an increasing proportion of Collembola with a full gut was found along a gradient of reduced sheep management intensity, which was correlated with increased fungal biomass. In the laboratory, this collembolan showed a consistent order of preference for the mycelium of seven common fungal species isolated from the field sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369308
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  • 8
    Electronic Resource
    Electronic Resource
    Effects on microflora of using naphthalene or X-rays to reduce arthropod populations in the field (1987)
    Springer
    Biology and fertility of soils 3 (1987), S. 11-13 
    Details
    ISSN: 1432-0789
    Keywords: Naphthalene ; X-rays ; Fungi ; Onychiurus latus ; Collembola
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Naphthalene or X-rays are often used to test the effect on soil processes of reducing or eliminating arthropods. Naphthalene, however, is shown here to reduce radial growth significantly in eight out of nine basidiomycete fungi tested. X-ray treatment, which killed only 24% of Onychiurus latus Gisin (Collembola), significantly reduced the radial growth rate of one of two fungi tested. These techniques are likely to affect the composition of microbial communities and therefore should be used only with extreme caution in field manipulation experiments involving fauna-microflora interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00260572
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  • 9
    Electronic Resource
    Electronic Resource
    Localization of Hæmocyanin on Starch Gel Electrophoretic Patterns (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 193-194 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The finding by Woods et al.2 of what are assumed to be several hsemocyanins in certain species can be interpreted in the following ways : (1) as separate molecular forms of hsemocyanin, or (2) dissociation-association products or other derivatives of a single molecular form, or (3) one or more ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/184193a0
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Dependence of Thermo-stimulated Current Curves on Heating Rate (1961)
    [s.l.] : Nature Publishing Group
    Nature 192 (1961), S. 349-350 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] During observations of thermo-stimulated currents in a number of cadmium sulphide single crystals following irradiation at 90 K. with cobalt-60 y-rays, we have noted in one specimen a current peak, the shape of which is critically dependent on the rate of temperature increase. As shown in Fig. 1, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/192349a0
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