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Digitale Medien

A qualitative mathematical model of the ontogeny of a circadian rhythm in crayfish (1993)

Lara-Aparicio, Miguel ; Medrano, Santiago López ; Fuentes-Pardo, Beatriz ; [weitere]

Springer

Bulletin of mathematical biology 55 (1993), S. 97-110

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ISSN: 1522-9602

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Mathematik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02460296

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2

Digitale Medien

The kinetics of enzyme systems involving activation of zymogens (1993)

Havsteen, B. H. ; Garcia-Moreno, M. ; Valero, E. ; [weitere]

Springer

Bulletin of mathematical biology 55 (1993), S. 561-583

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ISSN: 1522-9602

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Mathematik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02460651

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3

Digitale Medien

First observation of lasing at 231 Å in neon-like nickel using the prepulse technique (1993)

Nilsen, J. ; Moreno, J. C. ; MacGowan, B. J. ; [weitere]

Springer

Applied physics 57 (1993), S. 309-311

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ISSN: 1432-0649

Schlagwort(e): 42.60.By ; 32.30.Rj

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00332454

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4

Digitale Medien

Are there fast-rotating giant active longitudes ? (1993)

Rodriguez Taboada, R. E. ; Moreno, G. Gil

Springer

Solar physics 144 (1993), S. 399-402

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ISSN: 1573-093X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00627603

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