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

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          Fluctuation driven ratchets: Molecular motors.

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            Generic modelling of cooperative growth patterns in bacterial colonies.

            Bacterial colonies must often cope with unfavourable environmental conditions. To do so, they have developed sophisticated modes of cooperative behaviour. It has been found that such behaviour can cause bacterial colonies to exhibit complex growth patterns similar to those observed during non-equilibrium growth processes in non-living systems; some of the qualitative features of the latter may be invoked to account for the complex patterns of bacterial growth. Here we show that a simple model of bacterial growth can reproduce the salient features of the observed growth patterns. The model incorporates random walkers, representing aggregates of bacteria, which move in response to gradients in nutrient concentration and communicate with each other by means of chemotactic 'feedback'. These simple features allow the colony to respond efficiently to adverse growth conditions, and generate self-organization over a wide range of length scales.
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              Fractal Growth Phenomena

               Tamás Vicsek (1992)
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                Author and article information

                Journal
                PRLTAO
                Physical Review Letters
                Phys. Rev. Lett.
                American Physical Society (APS)
                0031-9007
                1079-7114
                August 1995
                August 7 1995
                : 75
                : 6
                : 1226-1229
                Article
                10.1103/PhysRevLett.75.1226
                10060237
                b80e2216-f01f-4aa0-8ce4-f5edbcfaa3e8
                © 1995
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