1,721,254 research outputs found
Caratterizzazione di piccole aperture per la valutazione della pericolosità dei campi elettromagnetici irradiati
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A composite model for DNA torsion dynamics
No full textDNA torsion dynamics is essential in the transcription process; a simple model for it, in reasonable agreement
with experimental observations, has been proposed by Yakushevich Y and developed by several authors;
in this, the nucleotides the DNA subunits made of a sugar-phosphate group and the attached nitrogen
base are described by a single degree of freedom. In this paper we propose and investigate, both analytically
and numerically, a “composite” version of the Y model, in which the sugar-phosphate group and the base are
described by separate degrees of freedom. The model proposed here contains as a particular case the Y model
and shares with it many features and results, but represents an improvement from both the conceptual and the
phenomenological point of view. It provides a more realistic description of DNA and possibly a justification for
the use of models which consider the DNA chain as uniform. It shows that the existence of solitons is a generic
feature of the underlying nonlinear dynamics and is to a large extent independent of the detailed modeling of
DNA. The model we consider supports solitonic solutions, qualitatively and quantitatively very similar to the
Y solitons, in a fully realistic range of all the physical parameters characterizing the DNA
NON LINEARLY LOADED INSULATED PROBES FOR THE MEASUREMENT OF ELECTRICAL FIELD DISTRIBUTION IN BIOLOGICAL MEDIA
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Distribuzione della densità di potenza dissipata in strutture biologiche irradiate da aperture
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