09:30 to 11:00 |
Snigdha Thakur (IISER Bhopal, India) |
Probing the dynamics of chemically active polymers using multi-particle collision dynamics Microtubule filaments are an important example of active polymer where the motor protein (kinesin) make use of chemical energy derived from the hydrolysis of adenosine triphosphate (ATP) to induce the conformational changes, which then leads to its motion on microtuble. In our work, we are interested in studying such active polymer that exhibits various interesting dynamics like self-propulsion, swelling, shrinkage, loop formation, spontaneous oscillation, spiral formations, enhanced diffusion etc.
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11:30 to 13:00 |
Snigdha Thakur (IISER Bhopal, India) |
Probing the dynamics of chemically active polymers using multi-particle collision dynamics Microtubule filaments are an important example of active polymer where the motor protein (kinesin) make use of chemical energy derived from the hydrolysis of adenosine triphosphate (ATP) to induce the conformational changes, which then leads to its motion on microtuble. In our work, we are interested in studying such active polymer that exhibits various interesting dynamics like self-propulsion, swelling, shrinkage, loop formation, spontaneous oscillation, spiral formations, enhanced diffusion etc.
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14:30 to 15:30 |
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Discussion time |
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16:00 to 17:00 |
Samriddhi Sankar Ray (ICTS-TIFR, India) |
Low Reynolds Number Active Suspensions: An Inertial Turbulence Approach Active turbulence — the spatio-temporally complex motion of a dense suspension of microorganisms such as bacteria — has gathered great traction recently as an intriguing class of emergent, complex flows, occurring in several living systems at the mesoscale, whose understanding lies at the interface of non-equilibrium physics and biology. However, are these low Reynolds number living flows really turbulent or just chaotic with structural, or even superficial, similarities with high Reynolds number (classical) inanimate turbulence? This is a vital question as the fingerprints of classical turbulence —-- universality, intermittency and chaos —-- makes it unique amongst the many different driven-dissipative systems. In this talk we address these questions with a focus on the issues of (approximate) scale-invariance, intermittency and maximally chaotic states and how they lead to anomalous diffusion in bacterial suspensions. In particular, we show the existing of a critical level of activity beyond which the physics of bacterial flows become universal, accompanied by maximally chaotic states which allow for efficient, Levy-walk mediated foraging strategies.
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17:00 to 18:00 |
Rajesh Ganpathy (NCBS-TIFR, India) |
Cell shape governs dynamics in Confluent Monolayers of Synthetic Cell Mimics In assemblies of passive particles, increasing the packing fraction can drive the system to a glassy or jammed state. Epithelial cell monolayers, however, can jam, unjam, and reveal many aspects of glassy-slowing down, often seen in passive systems while remaining confluent, i.e., the packing fraction remains unity. This remarkable feature of cell monolayers is largely due to the ability of the individual cells to change shape and thereby surmount the constraining effects of crowding. Living cell collectives, however, are complex, and besides cell shape changes, many other mechanisms that cause fluidization, such as cell division, apoptosis, and cell size changes, operate independently or together. It is impossible to suppress these processes completely, and there is no consensus on whether cell shape changes alone can drive jamming/unjamming. In my talk, I will describe a synthetic model system that allowed us to directly confront the question of whether shape changes alone can lead to jamming/unjamming.
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