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      Active Brownian particles : From individual to collective stochastic dynamics

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          Novel Type of Phase Transition in a System of Self-Driven Particles

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            Microscopic artificial swimmers.

            Microorganisms such as bacteria and many eukaryotic cells propel themselves with hair-like structures known as flagella, which can exhibit a variety of structures and movement patterns. For example, bacterial flagella are helically shaped and driven at their bases by a reversible rotary engine, which rotates the attached flagellum to give a motion similar to that of a corkscrew. In contrast, eukaryotic cells use flagella that resemble elastic rods and exhibit a beating motion: internally generated stresses give rise to a series of bends that propagate towards the tip. In contrast to this variety of swimming strategies encountered in nature, a controlled swimming motion of artificial micrometre-sized structures has not yet been realized. Here we show that a linear chain of colloidal magnetic particles linked by DNA and attached to a red blood cell can act as a flexible artificial flagellum. The filament aligns with an external uniform magnetic field and is readily actuated by oscillating a transverse field. We find that the actuation induces a beating pattern that propels the structure, and that the external fields can be adjusted to control the velocity and the direction of motion.
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              Dispersion of Soluble Matter in Solvent Flowing Slowly through a Tube

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                Author and article information

                Journal
                The European Physical Journal Special Topics
                Eur. Phys. J. Spec. Top.
                Springer Science and Business Media LLC
                1951-6355
                1951-6401
                March 2012
                March 30 2012
                March 2012
                : 202
                : 1
                : 1-162
                Article
                10.1140/epjst/e2012-01529-y
                7571756d-77a9-4e42-b35c-b61f0261fb3c
                © 2012

                http://www.springer.com/tdm

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