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  • 1
    Electronic Resource
    Electronic Resource
    Intrinsic interspecific competition between the polyembryonic parasitoid Copidosoma floridanum and solitary endoparasitoid Microplitis demolitor in Pseudoplusia includens (1990)
    Springer
    Entomologia experimentalis et applicata 55 (1990), S. 275-284 
    Details
    ISSN: 1570-7458
    Keywords: Multiparasitism ; competition ; polyembryony ; development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Lors de l'étude au laboratoire du multiparasitisme de Pseudoplusia includens Walker (Lépido. Noctuidae) par le parasitoïde ovolarvaire polyembryonnaire C. floridanum Ashmead (Hyméno. Encyrtidae) et l'endoparasitoïde larvaire M. demolitor Wilkinson (Hyméno. Braconidae), soit les hôtes donnent en majorité C. floridanum, soit ils meurent sans que quoi que ce soit émerge. P. includens non parasité présente 5 stades larvaires; les hôtes parasités par C. floridanum subissent 5 ou 6 stades avant le développement complet du parasitoïde, et les hôtes parasités par M. demolitor muent en stade 5 avant émergence du parasitoïde. Par contre, les hôtes multiparasités muent en stade 7; ceux qui produisent une couvée de C. floridanum ont présenté la croissance caractéristique des hôtes parasités par C. floridanum, tandis que les hôtes multiparasités qui sont morts avaient présenté la croissance caractéristique des hôtes parasités par M. demolitor. La plupart des hôtes multiparasités desquels C. floridanum a émergé ont augmenté de poids et présenté les caractères associés au début de la métamorphose. La descendance de M. demolitor est morte dans les hôtes multiparasités au stade œuf ou chenille du premier stade, mais il n'y avait aucum indice d'attaque physique par des larves de C. floridanum qui auraient été responsables de leur élimination.
    Notes: Abstract Multiparasitism studies were conducted in the laboratory between the egg-larval polyembryonic parasitoid Copidosoma floridanum (Ashmead) (Hymenoptera: Encyrtidae) and the larval endoparasitoid Microplitis demolitor Wilkinson (Hymenoptera: Braconidae) in the mutual host Pseudoplusia includens (Walker) (Lepidoptera: Noctuidae). Most multiparasitized hosts produced either a C. floridanum brood or died without any parasitoid emergence. Most multiparasitized hosts underwent supernumerary molting; however, multiparasitized hosts that produced a C. floridanum brood exhibited growth characteristics associated with C. floridanum parasitism while multiparasitized hosts that died exhibited growth characteristics more typical of M. demolitor parasitism. Multiparasitized hosts that produced a C. floridanum brood increased in weight, and usually exhibited the behavioral and morphological characteristics associated with initiation of metamorphosis. In contrast, multiparasitized hosts that ultimately died gained little weight and exhibited no characteristics associated with metamorphosis. M. demolitor progeny died in multiparasitized hosts as eggs or first instar larvae, but no direct evidence was found to indicate that physical attack by C. floridanum precocious larvae was responsible for their elimination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190667
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  • 2
    Electronic Resource
    Electronic Resource
    Phase coherent effects in a collisional turbulent plasma (1984)
    Springer
    Applied physics 35 (1984), S. 237-241 
    Details
    ISSN: 1432-0649
    Keywords: 52.35 Ra ; 52.25 Gj ; 51.50 +v
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Stochastic fluctuations in a glow-discharge tube show typical turbulent spectra, mode-mode coupling, and evidence of pronounced three-dimensionality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693933
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  • 3
    Electronic Resource
    Electronic Resource
    Structure and embedding theorems for small strong-π-lattices (1983)
    Springer
    Algebra universalis 16 (1983), S. 147-152 
    Details
    ISSN: 1420-8911
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01191761
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  • 4
    Electronic Resource
    Electronic Resource
    Neurotransmitter receptors as glycoproteins (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 1168-1171 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Incubation of calf brain membrane preparations with the plant lectins, concanavalin A and wheat germ agglutinin did not inhibit neurotransmitter receptor binding sites directly. Plant lectins did however protect these sites against subsequent trypsin digestion suggesting that neurotransmitter binding sites may be associated with glycoprotein structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01943166
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  • 5
    Electronic Resource
    Electronic Resource
    Sensitivity to open boundary forcing in a fine-resolution model of the Iberian shelf-slope region (1997)
    Springer
    Annales geophysicae 15 (1997), S. 113-123 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A fine-resolution primitive equation numerical model is constructed for the Iberian continental shelf and slope region, with open boundaries to the north, south and west. The model is forced by climatological wind fields and relaxed at the surface to climatological temperature and salinity fields. A series of numerical experiments is conducted to investigate the influence of the open boundary conditions. The numerical results include coastal upwelling in summer and a poleward current in winter. The effects of advection of Mediterranean Water and eastern North Atlantic Central Water feature in the circulation. Qualitative comparisons are made with observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-997-0113-3
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  • 6
    Electronic Resource
    Electronic Resource
    Differences between blacks and whites in plasma protein binding of drugs (1997)
    Springer
    European journal of clinical pharmacology 51 (1997), S. 485-488 
    Details
    ISSN: 1432-1041
    Keywords: Key words Plasma protein binding; blacks ; whites ; differences ; α1-acid glycoprotein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Objective: Disopyramide and salicylic acid were used as model compounds to characterize racial differences in binding of drugs by alpha1-acid glycoprotein (AGP) and albumin, respectively. Drug-free plasma was collected from 29 healthy volunteers (15 white, 14 black). Disopyramide and salicylic acid unbound fractions (fu) in plasma were determined by equilibrium dialysis using 14C-disopyramide and 14C-salicylic acid. Results: Disopyramide unbound fractions were significantly higher in blacks than whites (0.131 vs 0.113) as were salicylic acid unbound fractions (0.053 vs 0.048). When unbound fractions were corrected for AGP and albumin concentration, racial differences were no longer present. Conclusion: Many drugs which bind to AGP and/or albumin may exhibit racial differences in unbound fractions. However, these differences are likely explained by differences in protein concentrations rather than differences in the number of binding sites on the protein or racial differences in affinity of the protein for drugs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002280050235
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  • 7
    Electronic Resource
    Electronic Resource
    Ray trace calculations of ultrasonic fields (1991)
    Springer
    Research in nondestructive evaluation 3 (1991), S. 27-39 
    Details
    ISSN: 1432-2110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A computer program has been written to calculate realistic ultrasonic fields in solids. The program calculates the field due to a transducer coupled to the solid through either a fluid medium such as water or a solid medium such as a plastic shoe with a thin layer of fluid couplant. In this technique the transducer face is divided into many small areas, each of which is assumed to be a source of spherical waves. A ray is traced from each source point, through the coupling medium, and into the solid to the requested field point. The vector sum of the fields of each of the rays is then calculated to find the total incident field at that point for a particular frequency. The calculations have been compared to the fields predicted by the models of Thompson and coworkers [1, 2] and with experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01606509
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  • 8
    Electronic Resource
    Electronic Resource
    A note on extreme and exposed points inC n(I) (1971)
    Springer
    Mathematische Annalen 195 (1971), S. 95-102 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419615
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  • 9
    Electronic Resource
    Electronic Resource
    Numerical calculations of ultrasonic fields I: Transducer near fields (1982)
    Springer
    Journal of nondestructive evaluation 3 (1982), S. 25-35 
    Details
    ISSN: 1573-4862
    Keywords: Nondestructive evaluation ; ultrasonic field ; ultrasonic transducer modeling ; finite difference
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract A computer code for the calculation of linear acoustic wave propagation in homogeneous fluid and solid materials has been derived from the thermal-hydraulics code STEALTH. The code uses finite-difference techniques in a two-dimensional mesh made up of arbitrarily shaped quadrilaterals. Problems with two-dimensional plane strain or two-dimensional axial symmetries can be solved. Free, fixed, or stressed boundaries can be used. Transducers can be modeled by time dependent boundary conditions or by moving pistons. This paper gives a brief description of the method and shows the results of the calculation of the near fields of circular flat and focused transducers. These results agree with analytic theory along the axis of symmetry and with other codes that use a Huygens reconstruction technique off-axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566952
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of composition on selected physical properties of SiO2-K2O-Na2O glasses (1991)
    Springer
    Journal of materials science 26 (1991), S. 6501-6506 
    Details
    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 Physical properties were used to characterize a range of five, three-component glass formulations (SiO2-K2O-Na2O) synthesized from spray-dried precursor powders in terms of their final bulk chemical compositions. Five specimens per composition were produced by mixing dry glass powder with methyl alcohol to form a slurry, then shaping the slurry in a cylindrical mould, using conventional methods. Specimens were fired under vacuum. Optimum firing conditions for each glass were determined by selecting holding times which produced the maximum Young's modulus. Fracture toughness,K IC, values ranged from 0.92–0.99 MPa m1/2 and Young's modulus,E, values ranged from 45.09–58.06 GPa. Linear regression analyses showed significant correlations between chemical composition and fusion temperature (n=5;P〈0.001), opacity (n=5;P 〈0.01), specific gravity (n=5;P〈0.02), dynamic Young's modulus (n=5;P〈0.01) and fracture toughness (n=30;P〈0.001). The selected physical properties were found to be very sensitive to small variations in chemical composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02387837
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