Spherical grey vesicles
نویسندگان
چکیده
منابع مشابه
Topological instabilities of spherical vesicles.
Within the framework of the Helfrich elastic theory of membranes and of differential geometry, we study the relative stability of spherical vesicles and double bubbles. We find that not only temperature but also magnetic fields can induce topological transformations between spherical vesicles and double bubbles and provide a phase diagram for the equilibrium shapes.
متن کاملStability of Spherical Vesicles in Electric Fields
The stability of spherical vesicles in alternating (ac) electric fields is studied theoretically for asymmetric conductivity conditions across their membranes. The vesicle deformation is obtained from a balance between the curvature elastic energies and the work done by the Maxwell stresses. The present theory describes and clarifies the mechanisms for the four types of morphological transition...
متن کاملNearly spherical vesicles in an external flow
We theoretically analyze a vesicle with small excess area, which is immersed in an external flow. A dynamical equation for the vesicle evolution is obtained by solving the Stokes equation with suitable boundary conditions imposed on the membrane. The equation has solutions corresponding to different types of motion, such as tank-treading, tumbling and trembling. A phase diagram reflecting the r...
متن کاملFree fluid vesicles are not exactly spherical.
At finite temperature, vesicles perform small fluctuations around an average shape. In the limit of low temperature or high bending rigidity, the fluctuations vanish and the vesicle approaches the energetically favored configuration. In the absence of a volume constraint the configuration of lowest energy is a perfect sphere. It is often assumed that the spherical shape is also the most probabl...
متن کاملDynamics of nearly spherical vesicles in an external flow.
Tank-treading, tumbling, and trembling are different types of the vesicle behavior in an external flow. We derive a dynamical equation enabling us to establish a state of nearly spherical vesicles. For a 2D external flow, the character of the vesicle dynamics is determined by two dimensionless parameters, depending on the vesicle excess area, fluid viscosities, membrane viscosity and bending mo...
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ژورنال
عنوان ژورنال: British Dental Journal
سال: 2011
ISSN: 0007-0610,1476-5373
DOI: 10.1038/sj.bdj.2011.829