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  • Articles  (64)
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  • Elsevier  (40)
  • Springer  (16)
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  • 2015-2019
  • 2010-2014
  • 1990-1994  (46)
  • 1985-1989
  • 1980-1984  (18)
  • 1993  (46)
  • 1980  (18)
  • Physics  (32)
  • Chemistry and Pharmacology  (32)
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  • Articles  (64)
  • Other Sources
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  • 2015-2019
  • 2010-2014
  • 1990-1994  (46)
  • 1985-1989
  • 1980-1984  (18)
Year
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  • 1
    Electronic Resource
    Electronic Resource
    A qualitative mathematical model of the ontogeny of a circadian rhythm in crayfish (1993)
    Springer
    Bulletin of mathematical biology 55 (1993), S. 97-110 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Based on experimental work on the ontogeny of the electroretinogram circadian rhythm in crayfish, we present a mathematical model simulating changes in both frequency and amplitude of the electroretinogram oscillation during several developmental stages until shortly before the adult age. Simultaneously, we propose a hypothetical oscillation in the hormonal release whose frequency is imposed on the electroretinogram oscillation. The model consists of two coupled nonlinear oscillators in which a dynamical response is obtained mainly through an Andronov-Hopf bifurcation. Through the construction of the model, a biological hypothesis about the essential elements underlying the ERG circadian rhythm and their interrelations is formulated and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460296
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  • 2
    Electronic Resource
    Electronic Resource
    The kinetics of enzyme systems involving activation of zymogens (1993)
    Springer
    Bulletin of mathematical biology 55 (1993), S. 561-583 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract A general model of zymogen activation is proposed and explicit kinetic equations for the time courses of the various species and products involved are given. These equations are valid for the whole course of the reaction and therefore for both the transient phase and the steady state. This model is sufficiently general to include mechanisms possessing one or more steps of zymogen activation besides possible steps of inhibition (reversible or irreversible) or inactivation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460651
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  • 3
    Electronic Resource
    Electronic Resource
    First observation of lasing at 231 Å in neon-like nickel using the prepulse technique (1993)
    Springer
    Applied physics 57 (1993), S. 309-311 
    Details
    ISSN: 1432-0649
    Keywords: 42.60.By ; 32.30.Rj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report lasing for the first time in nickel on the neon-like J=0→1, 3p→3s transition at 231 Å as well as several weaker transitions including the J=2»1 lines at 298 Å and 304 Å. Amplification is seen only when the prepulse technique of using a low intensity prepulse before the main optical drive pulse is used to illuminate the nickel target. The prepulse technique is also shown to produce lasing in copper and dramatically improve the output of the germanium laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332454
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  • 4
    Electronic Resource
    Electronic Resource
    Kalman filtering-aided time-resolved solid-surface room temperature phosphorimetry for simultaneous determination of tetracyclines in solution (1993)
    Springer
    Microchimica acta 112 (1993), S. 47-54 
    Details
    ISSN: 1436-5073
    Keywords: chemometrics ; multicomponent analysis ; Kalman filtering ; tetracyclines determination ; room temperature phosphorescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Tetracycline, chlortetracycline and oxytetracycline react with Eu (III) to form complexes which exhibit analytically useful room temperature phosphorescence (RTP). The RTP features of the three complexes are similar and the RTP spectra completely overlap. However, their three phosphorescence decay rates are quite different. These differences are utilized here to analyze the time-resolved RTP data by Kalman filtering. Simultaneous quantification of all the three complexes is demonstrated and a method is proposed for the simultaneous determination of the three tetracyclines in mixtures by RTP optosensing. Analytical errors observed are within ± 5%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01243320
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  • 5
    Electronic Resource
    Electronic Resource
    Are there fast-rotating giant active longitudes ? (1993)
    Springer
    Solar physics 144 (1993), S. 399-402 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The distribution of significant solar activity for the northern and southern solar hemispheres from 1964 through 1979 is studied. Two 90-degree wide active longitudes, separated 180 degrees and rotating with a velocity 1% faster than the solar surface, are proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00627603
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  • 6
    Electronic Resource
    Electronic Resource
    A model for non-linear processing in cat's retina (1980)
    Springer
    Biological cybernetics 37 (1980), S. 25-31 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract The model is based on the concept that non-linear lateral interaction at the inner plexiform layer accounts for most of the specialization and marked non-linearities in cat's retinal ganglion cell responses. The inputs to the lateral interaction processes are a spatio-temporal signal and its retarded, as suggested by the behaviour of simple ganglion cells. Lateral interaction in the model consists of lateral linear inhibition followed by local half wave rectification. The resulting signals are weighted and summated by the ganglion cell thereafter. A transparent and general expression is obtained for the response of the cell model which, albeit its simplicity, leads to most of known types of non-linear responses, including the rarely encountered specialized cells in cat's, retina, except colour coding units. For negligible lateral interaction, the model reduces to spatio-temporal linear models under the two paths hypothesis. A discussion of the possible role of anatomical units in these retinal processes in presented, where a general interpretation for visual processing in cat's retina evolves from.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00347639
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  • 7
    Electronic Resource
    Electronic Resource
    A layered model for visual processing in avian retina (1980)
    Springer
    Biological cybernetics 38 (1980), S. 85-89 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Visual processing in avian retina is interpreted by means of a layered model in which: a) outer layers provide with spatio temporal fast and retarded versions of the stimuli incident on the retina; a possibility is that horizontal cells are involved in isotropically generating the retarded version which is transversally translated; b) prominent specialization of ganglion cells is the result of local non-linear lateral interaction at the inner plexiform layer, mediated by amacrines which return, also isotropically, the translated retarded signals. Small though systematic deviations in the sites of the lateral interaction result in anisotropic but uniform receptive fields for some ganglion cells. A simple though general expressin for the model is derived which includes the various types of recorded avian ganglion retinal cells responses, which also permits a unified interpretation of visual processing in avian and cat's retinae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356034
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  • 8
    Electronic Resource
    Electronic Resource
    Copper(II) and cadmium(II) complexes of 2-benzylthio-4-formyl-1-p-methoxyphenylimidazole: crystal structure, spectral properties and thermal behaviour (1993)
    Springer
    Transition metal chemistry 18 (1993), S. 481-484 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The coordinative capacity of 2-benzylthio-4-formyl-1-p-methoxyphenylimidazole (ALME) with several transition metal ions has been investigated and has led to only copper(II) and cadmium(II) complexes of general formula [MIICl2(ALME)2]·nH2O. These compounds were studied by spectral (i.r., u.v.-vis. n.i.r. and e.p.r.) and thermal methods (t.g., d.t.g. and d.s.c.) as well as magnetic susceptibility measurements. The crystal structure of the copper complex has been solved, although a full refinement of the structure has not been possible as very few measured reflections were observed. The structure consists of discrete [CuCl2-(ALME)2] units in which Cu(II) ion is 4 + 2 Cl2N2O2 surrounded [Cu{ie481-01}Cl(1), 2.28(1) Å; Cu{ie481-02}Cl(2), 2.29(1) Å; Cu{ie481-03}N, 2.00(2) Å; Cu{ie481-04}O, 2.71(2) Å]. The ALME ligand acts as bidentate chelator through the N(3) imidazolic atom and the oxygen of the formyl group, the Cu{ie481-05}O interaction being very weak. Water molecules have not been localized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00136609
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  • 9
    Electronic Resource
    Electronic Resource
    Expression of lactate dehydrogenase isozyme X in haploid cells of pigeon testis (1980)
    Springer
    Molecular and cellular biochemistry 30 (1980), S. 87-91 
    Details
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Electrophoretic patterns of lactate dehydrogenase (EC 1.1.1.27) from adult testes show the existence of three different phenotypes for the isozyme X or C4 in populations of racing homer pigeons. These phenotypes are the expression of two different alleles at the Ldh c locus. Analysis of electrophoretic patterns of lactate dehydrogenase from lysates of mature spermatozoa isolated from pigeons heterozygous at the Ldh c locus indicates that the two different alleles are expressed in haploid cells. It is concluded that transcription of the gene coding for isozyme X must occur only in pre-meiotic cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227922
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  • 10
    Electronic Resource
    Electronic Resource
    An experimental assessment of the Wagner-Sedman extraction theory for the intestinal absorption of antibacterial sulfonamides (1980)
    Springer
    Journal of pharmacokinetics and pharmacodynamics 8 (1980), S. 297-309 
    Details
    ISSN: 1573-8744
    Keywords: Sulfonamides ; absorption rate constants ; reverse-phase partition chromatography ; Wagner-Sedman extraction theory ; absorption from the small intestine ; logarithmiclogistic correlations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The chromatographic parameters in a reverse-phase partition system and the rat gut in situabsorption rate constants for 18 antibacterial sulfonamides are highly correlated values. The correlation is logarithmic-logistic in nature, being in accordance with the Wagner-Sedman extraction theory for a constant pH value. Parabolic correlations did not satisfactorily fit the experimental data. This behavior, not frequently reported in regard to the intestinal absorption of drugs, is discussed in connection with other apparently contradictory available data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01059647
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