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Displaying 441 –
460 of
1854
The paper is devoted to the method of computer simulation of protein interactions taking
part in photosynthetic electron transport reactions. Using this method we have studied
kinetic characteristics of protein-protein complex formation for four pairs of proteins
involved in photosynthesis at a variety of ionic strength values. Computer simulations
describe non-monotonic dependences of complex formation rates on the ionic strength as the
result of...
The nonlocal Fisher equation has been proposed as a simple model exhibiting Turing
instability and the interpretation refers to adaptive evolution. By analogy with other formalisms
used in adaptive dynamics, it is expected that concentration phenomena (like convergence to a sum
of Dirac masses) will happen in the limit of small mutations. In the present work we study this
asymptotics by using a change of variables that leads to a constrained Hamilton-Jacobi equation.
We prove the convergence analytically...
We introduce and study conditional differential equations, a kind of random differential equations. We give necessary and sufficient conditions for the existence of a solution of such an equation. We apply our main result to a Malthus type model.
Nel panorama della scienza contemporanea, la biologia molecolare ha recentemente assunto un ruolo di fondamentale importanza. Il bisognocrescente di conoscere intere sequenze genomiche e l’esigenza, ancora piùpressante, di analizzare e confrontare tali sequenze per poter dedurre funzionalità e discendenze comuni, ha reso necessaria l’integrazione delleusuali tecniche sperimentali, proprie della ricerca biologica, con le metodologie formali della matematica e dell’informatica. Queste motivazioni...
A common framework for analyzing the global convergence of several flows for principal component analysis is developed. It is shown that flows proposed by Brockett, Oja, Xu and others are all gradient flows and the global convergence of these flows to single equilibrium points is established. The signature of the Hessian at each critical point is determined.
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1854