Fachgebiet Statistische Physik weicher Materie und biologischer Systeme

4 Items

Recent Submissions
Physical minimal models of amoeboid cell motility

Kulawiak, Dirk Alexander (2017)

Cell locomotion plays an important role in many biological processes such as the immune system, embryonic development, or cancer metastasis. In these examples, cells interact with their environments or coordinate their movements with other cells, creating collective behavior. In this thesis, we utilize minimal modeling to investigate single and collective cell motility in three different settin...

Dynamics of a bacterial flagellum under reverse rotation

Adhyapak, Tapan Chandra ; Stark, Holger (2016)

To initiate tumbling of an E. coli, one of the helical flagella reverses its sense of rotation. It then transforms from its normal form first to the transient semicoiled state and subsequently to the curly-I state. The dynamics of polymorphism is effectively modeled by describing flagellar elasticity through an extended Kirchhoff free energy. However, the complete landscape of the free energy r...

Phase separation and coexistence of hydrodynamically interacting microswimmers

Blaschke, Johannes ; Maurer, Maurice ; Menon, Karthik ; Zöttl, Andreas ; Stark, Holger (2016)

A striking feature of the collective behavior of spherical microswimmers is that for sufficiently strong self-propulsion they phase-separate into a dense cluster coexisting with a low-density disordered surrounding. Extending our previous work, we use the squirmer as a model swimmer and the particle-based simulation method of multi-particle collision dynamics to explore the influence of hydrody...

Taylor line swimming in microchannels and cubic lattices of obstacles

Münch, Jan L. ; Alizadehrad, Davod ; Babu, Sujin B. ; Stark, Holger (2016)

Microorganisms naturally move in microstructured fluids. Using the simulation method of multi-particle collision dynamics, we study in two dimensions an undulatory Taylor line swimming in a microchannel and in a cubic lattice of obstacles, which represent simple forms of a microstructured environment. In the microchannel the Taylor line swims at an acute angle along a channel wall with a clearl...