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  • 1
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    Entropy, Vol. 14, Pages 1140-1153: Exact Solutions in Modified Gravity Models (2012)
    MDPI Publishing
    In: Entropy
    Details
    Publication Date: 2012-08-11
    Description: We review the exact solutions in modified gravity. It is one of the main problems of mathematical physics for the gravity theory. One can obtain an exact solution if the field equations reduce to a system of ordinary differential equations. In this paper we consider a number of exact solutions obtained by the method of separation of variables. Some applications to Cosmology and BH entropy are briefly mentioned.
    Electronic ISSN: 1099-4300
    Topics: Chemistry and Pharmacology , Physics
    Published by MDPI Publishing
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  • 2
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    Symmetry, Vol. 10, Pages 53: Some Aspects of Nonlinearity and Self-Organization In Biosystems on Examples of Localized Excitations in the DNA Molecule and Generalized Fisher–KPP Model (2018)
    MDPI Publishing
    In: Symmetry
    Details
    Publication Date: 2018-02-28
    Description: Symmetry, Vol. 10, Pages 53: Some Aspects of Nonlinearity and Self-Organization In Biosystems on Examples of Localized Excitations in the DNA Molecule and Generalized Fisher–KPP Model Symmetry doi: 10.3390/sym10030053 Authors: A. Shapovalov V. Obukhov This review deals with ideas and approaches to nonlinear phenomena, based on different branches of physics and related to biological systems, that focus on how small impacts can significantly change the state of the system at large spatial scales. This problem is very extensive, and it cannot be fully resolved in this paper. Instead, some selected physical effects are briefly reviewed. We consider sine-Gordon solitons and nonlinear Schrodinger solitons in some models of DNA as examples of self-organization at the molecular level, as well as examine features of their formation and dynamics under the influence of external influences. In addition, the formation of patterns in the generalized Fisher–KPP model is viewed as a simple example of self-organization in a system with nonlocal interaction at the cellular level. Symmetries of model equations are employed to analyze the considered nonlinear phenomena. In this context the possible relations between phenomena considered and released activity effect, which is assessed differently in the literature, are discussed.
    Electronic ISSN: 2073-8994
    Topics: Mathematics , Physics
    Published by MDPI Publishing
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  • 3
    Electronic Resource
    Electronic Resource
    Cytoarchitectonics and neuronal organization of the sturgeon telencephalon (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 15 (1999), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Anatomy, cytoarchitecture and neuronal composition of the i everted-type telencephalon of various sturgeon species; (Acipenser baeri Br., Acipenser stellatus Pall., Acipenser nudiventris Lov., Acipenser ruthenus L., Acipenser gueldenstaedtii Br., Huso huso L.) were studied by classical histological methods and by TV-imaging. Hemisphere cytoarchitecture was significantly variable across species and genus, while neurone composition proved to be rather conservative. Neurones were mainly of the undifferentiated, isodendritic type. The question of homology of structures between everted and inverted vertebrate telencephala is discussed, and our observations lead us to hypothesise that evolution of the unusual Actinopterygian (and acipenserid) telencephalon has been limited and is, in fact, an evolutionary “dead-end”.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1999.tb00214.x
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