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  • Springer  (18)
  • Periodicals Archive Online (PAO)
  • 1975-1979  (18)
  • 1976  (18)
  • 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
    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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  • 3
    Electronic Resource
    Electronic Resource
    Specific field emission properties of thin palladium films (1976)
    Springer
    Applied physics 10 (1976), S. 265-268 
    Details
    ISSN: 1432-0630
    Keywords: 79.40 ; 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 The field emission current from thin palladium films deposited on insulating tips in UHV was measured as a function of film thickness at relatively low field strengths. The observed periodic oscillations of the field emission current can be interpreted as the quantum size effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00897226
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  • 4
    Electronic Resource
    Electronic Resource
    Corticotroph cells in primary cultures of rat adenohypophysis: A light and electron microscopic immunocytochemical study (1976)
    Springer
    Histochemistry and cell biology 50 (1976), S. 161-174 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Monolayer cultures of trypsin-dispersed cells of the rat adenohypophysis were grown for 5 to 54 days. ACTH was localized by immunocytochemistry using an antiserum to synthetic ACTH1–28 prepared in rabbit and sheep anti-goat immunoglobulin coupled with peroxidase. ACTH content of the culture medium was measured by radioimmunoassay. Corticotrophs were found in the cultures and ACTH in the medium at each cultivation time. The corticotrophs retained their essential morphological characteristics. Immunological staining was found in the secretory granules, some tubular or saccular structures, parts of the rough endoplasmic reticulum, and the cytoplasmic matrix. Immature secretory granules in the Golgi apparatus as well as some Golgi elements showed different degrees of immunoreactivity. In agreement with the high ACTH content of the culture medium the number, size and shape of the secretory granules, the active Golgi apparatus, the high amount of extragranular ACTH as well as pictures suggesting granule extrusion claim for a high ACTH synthesis and transport (and low ACTH storage) in the cultured corticotrophs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00495826
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  • 5
    Electronic Resource
    Electronic Resource
    Optical and electrical studies on dansyllysine-valinomycin in thin lipid membranes (1976)
    Springer
    European biophysics journal 2 (1976), S. 119-137 
    Details
    ISSN: 1432-1017
    Keywords: Valinomycin ; Lipid membranes ; Fluorescence ; Relaxation methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Summary Dansyllysine-valinomycin, a fluorescent analogue of the ionophore valinomycin was synthesized and incorporated into black lipid membranes. Its concentration inside the membrane was measured fluorometrically and was also determined from electrical relaxation experiments, which were analyzed on the basis of a previously proposed carrier model. The results of both methods agreed within less than one order of magnitude. This appears satisfactory in view of the sources of error inherent in both procedures. A conductance increment per carrier molecule of about 3 · 10−17 Ω−1 was obtained for dansyllysine-valinomycin in diphytanoyllecithin membranes at 25
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00863705
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  • 6
    Electronic Resource
    Electronic Resource
    Isolation of adaptation mechanisms and photopigment spectra by vitamin A deprivation inDrosophila (1976)
    Springer
    Journal of comparative physiology 105 (1976), S. 15-27 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Intense short wavelength adaptation converts rhodopsin to a long wavelength absorbing stable metarhodopsin and inactivates R1–6 photoreceptors inDrosophila. In addition to decreasing sensitivity, vitamin A deprivation eliminates this short wavelength induced R1–6 inactivation. A model (Fig. 4) explains this adaptational difference of vitamin A deprivedDrosophila (from normally-reared or high vitamin A supplemented flies) in terms of decreasing photopigment quantity without decreasing membrane adaptation mediating channels. The data and model suggest that 1) photopigment and membrane processes are separate; 2) transduction and adaptational mechanisms are different; and 3) maximal adaptation establishes a steadystate wavelength-specific rhodopsin to metarhodopsin ratio. Sensitivity as a function of wavelength for maximal adapting stimuli was obtained from vitamin A deprivedDrosophila (Fig. 3). These data reflect relative rhodopsin levels. They were used to derive a measure related to spectral sensitivity ofin vivo metarhodopsin spectral absorption characteristics (Fig. 5). The presently reported metarhodopsin spectral function has certain advantages over previously reported electrophysiologically-based functions. It differs fromin vitro data by having an ultraviolet maximum and a shorter wavelength visible maximum. This finding is consistent with current theory on fly vision. The data obtained from vitamin A deprivedDrosophila are similar to data fromCalliphora andMusca; possible adaptational differences among different fly species may be explained by the model which explains differences betweenDrosophila in the vitamin A deprived vs. enriched conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01380050
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  • 7
    Electronic Resource
    Electronic Resource
    Spectral sensitivities and photopigments in adaptation of fly visual receptors (1976)
    Springer
    Naturwissenschaften 63 (1976), S. 513-518 
    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/BF00596847
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  • 8
    Electronic Resource
    Electronic Resource
    Microspectrophotometry of mitochondrial cytochrome P-450 in single adrenal cells (1976)
    Springer
    Journal of molecular histology 8 (1976), S. 283-290 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Synopsis The cytochrome P-450 is known to be a key enzymic component in steroid hydroxylation. Biochemically it is localized in adrenal cells, both in the mitochondrial and in the microsomal fractions. Owing to its characteristic light absorptivity, attempts were made at its localization and measurement in a microspectrophotometric system. Specific difference spectra were obtained in the cytoplasm of some cells from an adrenal cell suspension before and after saturation with carbon monoxide. Scanning at 450 nm showed slender absorption maxima after CO saturation randomly distributed in the cytoplasm. These may be attributed to mitochondria or larger cytoplasmic functional units including mitochondria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01003817
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of changes in the lattice parameters on the Fermi surface of zinc (1976)
    Springer
    Journal of low temperature physics 25 (1976), S. 219-224 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of changes in the lattice parameters on the Fermi surface of zinc is calculated. The results of the calculations are in reasonably good agreement with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654830
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  • 10
    Electronic Resource
    Electronic Resource
    Simulation of ocular dysmetria using a sampled-data model of the human saccadic system (1976)
    Springer
    Annals of biomedical engineering 4 (1976), S. 321-329 
    Details
    ISSN: 1573-9686
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Simulation studies of a sampled-data model of the human saccadic eye movement system show that saccadic ocular dysmetria could be caused by fluctuations in the controller gain of the system. In normal subjects these gain fluctuations may be adaptively corrected by the cerebellum. Our model shows that the loss of this adaptive controller function in patients with cerebellar lesions results in oscillatory eye movements characteristic of saccadic ocular dysmetria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000001
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