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  • Springer  (106)
  • Elsevier  (73)
  • National Academy of Sciences  (13)
  • 1985-1989  (104)
  • 1975-1979  (88)
  • 1
    Electronic Resource
    Electronic Resource
    Sensitivity of control parameters in a model of saccadic eye tracking and estimation of resultant nervous activity (1976)
    Springer
    Bulletin of mathematical biology 38 (1976), S. 39-57 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract A model for the extraocular plant of the human visual eye tracking mechanisms is discussed. Its sensitivity to variation of controller signal nervous activity is studied in order to determine the type of activity that yields realistic simulations characteristic of typical saccadic eye movements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459539
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  • 2
    Electronic Resource
    Electronic Resource
    Inners and biocontrol models (1975)
    Springer
    Bulletin of mathematical biology 37 (1975), S. 161-180 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Techniques of modelling and simulation are discussed as they relate to bioengineering systems. The advantages and disadvantages of different analytical engineering methods utilized to gather information concerning the behavior of complex physiological and neuromuscular control mechanisms are explained. An Inners Criterion is developed to determine if the roots of a model lie within a certain “biologically realistic region” ΓB, in the complex plane which contains the roots of linearized models for a large variety of neuromuscular systems. Several algorithmic methods based on the Jury Inners Test are described which specify whether the model roots lie within the desired region, thereby providing an indication as to the validity of the proposed model. This technique can help to eliminate tedious simulation on an unrealistic model with roots lying far outside this region. An exemplary model for control of vergence eye movements is presented and shown to satisfy the ΓB criterion; several counter-examples are also discussed. The Inners approach can be adapted to other classes of bioengineering systems by specifying the region based on models that are contained in the class of interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02470622
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  • 3
    Electronic Resource
    Electronic Resource
    The oscillator strength of theC 2 Swan bands (1985)
    Springer
    The European physical journal 321 (1985), S. 75-77 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Litetimes of six individual rotational levels in theν=0 vibrational level of the3 π g state of C2 were measured by monitoring the fluorescent decay after pulsed laser excitation. A value of 92±5 ns was obtained, 25% lower than previous measurements. The corresponding oscillator strength for the Swan (0-0) band isf 00=0.032±0.002, in agreement with recent theoretical work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411947
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of cortexolone on the feedback action of dexamethasone (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 1365-1366 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Cortexolone in a dose of 1 mg/100 g body wt., administered to rats prior to dexamethasone, prevented dexamethasone from suppressing stress-induced ACTH-release without interfering with the effect of dexamethasone on the resting plasma corticosterone level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01945830
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  • 5
    Electronic Resource
    Electronic Resource
    Chrysoperla carnea predation on Heliothis virescens larvae parasitized by Microplitis croceipes (1988)
    Springer
    Entomologia experimentalis et applicata 48 (1988), S. 69-72 
    Details
    ISSN: 1570-7458
    Keywords: predator ; parasitoid ; cotton ; biological control ; natural enemy interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les prédations de chenilles d'Heliothis virescens, parasitées ou saines, élevées sur coton (Gossypium hirsutum L.), de la variété Stoneville 213, ont été comparées, dans des cages de 10 m2 chacune placées dans la nature. Des chenilles du second stade ont été placées sur des pieds de coton dans 10 cages, à raison de 160 chenilles préalablement exposées à M. croceipes pendant leur premier stade et 40 chenilles saines par cage. Des larves du troisième stade de Chrysopa carnea ont été ajoutées dans 6 cages, à raison de 500/cage, et 4 cages ont servi de témoins pour évaluer les autres causes de mortalité. L'expérience a été répétée 2 fois. Les chenilles d'H. virescens ont été retirées au bout d'un jour dans une expérience et au bout de 2 jours dans l'autre. C. carnea n'a fait aucun choix entre chenilles parasitées ou non; la fréquence moyenne de chenilles parasitées n'a pas présenté de différence significative entre les cages avec ou sans C. carnea. Qui qu'il en soit, C. carnea a réduit significativement la survie des chenilles d'H. virescens parasitées ou non.
    Notes: Abstract Predation by third instar larvae of Chrysoperla (=Chrysopa) carnea (Stephens) (Chrysopidae) did not alter the ratio of unparasitized Heliothis virescens (F.) (Noctuidae) larvae to H. virescens larvae parasitized by Microplitis croceipes (Cresson) (Braconidae) when these second instar larvae were exposed together to the predator on cotton (Gossypium hirsutum L., Malvaceae) in field cages. This indicates that C. carnea larvae did not prefer either parasitized or unparasitized larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343387
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  • 6
    Electronic Resource
    Electronic Resource
    Genetic recombination in the major histocompatibility complex (H-1, Ag-B) of the rat (1977)
    Springer
    Immunogenetics 5 (1977), S. 183-187 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570474
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  • 7
    Electronic Resource
    Electronic Resource
    Direct phosphorus transfer from leaf litter to roots (1978)
    Springer
    Naturwissenschaften 65 (1978), S. 208-209 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00450594
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  • 8
    Electronic Resource
    Electronic Resource
    Observations on the history of central B-splines (1988)
    Springer
    Archive for history of exact sciences 39 (1988), S. 137-156 
    Details
    ISSN: 1432-0657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348440
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  • 9
    Electronic Resource
    Electronic Resource
    The quantum size effect in thin antimony films (1976)
    Springer
    Applied physics 11 (1976), S. 41-45 
    Details
    ISSN: 1432-0630
    Keywords: 73
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Thin antimony films have been epitaxially deposited at 350K onto cleavage surfaces of mica at different residual gas pressures between 10−5 and 10−9 torr, and their resistivity ∂ measured as a function of film thicknessd≦500Å at temperaturesT=110K andT=300K. The ∂(d) characteristics of films deposited at residual gas pressures of about 10−6 torr with condensation rates of about 1Å/s showed generally decreasing slopes as film thicknesses increased, but irregularities in detail. The ∂(d) characteristics of films deposited at 10−8 torr with the same condensation rate decreasing with increasingd, too, show no such irregularities but very small regular variations of ∂(d) with constant oscillation length Δd between the maxima, and decreasing amplitudes with increasingd. These variations are better recognizable in a modified ∂(d) graph. We tend to interprete these variations by the quantum size effect as we found oscillation lengths and amplitudes compatibel with theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00895014
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  • 10
    Electronic Resource
    Electronic Resource
    Spatial distribution of impurities in delta-doped n-type GaAs (1988)
    Springer
    Applied physics 47 (1988), S. 123-129 
    Details
    ISSN: 1432-0630
    Keywords: 81.10 ; 73.60 ; 75.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Capacitance-voltage (CV) profiling measurements on delta-doped n-type GaAs reveal extremely narrow peaks with a full-width at half-maximum of 40 Å. Comparison of experimental with self-consistently calculated CV profiles demonstrates that Si impurities are localized on a length scale of a lattice constant in delta-doped GaAs. Diffusion and segregation are of minor importance. The basic theory of CV measurements on quantummechanical systems such as delta-doped semiconductors is developed and presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618876
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