Soft Active Materials: From Granular Rods to Flocks, Cells and Tissues

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This ICAM workshop brought together junior and senior researchers working on the emergent properties of soft active matter. It focused on nonequilibrium collective behavior and locomotion in active systems, including mixtures of cytoskeletal filaments and motor proteins, the cell cytoskeleton, bacte…

Institute for Complex Adaptive Matter (ICAM)

  • May 21, 2009 LATEST EPISODE
  • infrequent NEW EPISODES
  • 35m AVG DURATION
  • 35 EPISODES


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Latest episodes from Soft Active Materials: From Granular Rods to Flocks, Cells and Tissues

Dynamics of Active Cellular Response Under Mechanical Stress

Play Episode Listen Later May 21, 2009 41:34


This talk discusses various types of forces that cells often experience. Rumi De also explains how these forces may influence cellular activity.

Endothelial Cell Network Assembly on Soft Subtrates

Play Episode Listen Later May 21, 2009 54:02


Cynthia Reinhart-King explains how substrates play a large role in cell connectivity. The effects on cell assembly are also examined.

Response of Cells to Nonlinear Elastic Substrates

Play Episode Listen Later May 21, 2009 51:56


This presentation discusses tissue stiffness and how cells react to this type of stress. In addition, the effects of gels on cell signaling are also examined.

A Model for Surface Tension in Cell Aggregates

Play Episode Listen Later May 21, 2009 11:30


Lisa Manning examines the liquid-like properties of cell movement using a 3D interaction model for embryonic tissue. This is a realistic model that takes many physical forces into account.

Multi-cellular Substrate Deformation Guides Collective Migration

Play Episode Listen Later May 21, 2009 23:48


This talk examines substrate-cell interactions and explains how these connections influence collective migration.

F-actin Dynamics in Human Skin Cells Directs Velocity of Cell Migration

Play Episode Listen Later May 21, 2009 19:40


This presentation examines the behavior of Candida albicans and Saccharomyces cerevisiae. In particular, there is a focus on the actin modelling dynamics of each organism.

Session VI Discussion

Play Episode Listen Later May 21, 2009 25:15


A discussion with presenters from Session VI: Rumi De, Cynthia Reinhart-King, Paul Janmey, Lisa Manning, Thomas Angelini, and Torsten Wöllert.

Out-of-equilibrium in vitro Actin Networks

Play Episode Listen Later May 20, 2009 15:30


This talk examines the strength of actin networks as a function of physical properties, such as myosin concentration and rupture events.

The Transportation System Inside a Living Cell

Play Episode Listen Later May 20, 2009 14:00


An overview of the components involved in cellular transport systems. The mechanisms of active transport and filament switching are also discussed.

Theory of Filament Depolymerization by Motor Proteins

Play Episode Listen Later May 20, 2009 17:30


This presentation discusses the kinesins involved in microtubule depolymerization and the factors that determine the depolymerization rate.

Invasive Patterns of Malignant Brain Tumors

Play Episode Listen Later May 20, 2009 19:50


Evgeniy Khain provides some background on primary brain tumors and discusses how tumor cell growth depends on the level of adhesion.

Session IV Discussion

Play Episode Listen Later May 20, 2009 34:21


A discussion with presenters from Session IV: Margaret Gardel, Jean-Francois Joanny, Simone Koehler, Clare Yu, Meredith Betterton and Evgeniy Khain.

Growth Induced Ordering and Streaming in Dense Bacterial Populations

Play Episode Listen Later May 20, 2009 42:14


Lev Tsimring explains how growing bacteria behave similarly to a granular material system and how differential growth can lead to population instability.

Self-Propelled Particles: From Microdynamics to Hydrodynamics

Play Episode Listen Later May 20, 2009 34:09


This talk characterizes the hydrodynamics of liquid crystal systems and examines fluctuations in bulk systems.

Hydrodynamics and Rheology of Active Polar Films

Play Episode Listen Later May 20, 2009 12:07


This presentation discusses the equations of active hydrodynamics, the viscosity of polar systems, and the spontaneous flow of polar and non-polar systems.

Electrically Driven Dynamics of Small Particles in Liquid Crystals

Play Episode Listen Later May 20, 2009 15:30


Oleg Lavrentovich discusses the effects that an electric field can have on simple crystal particles within a complex medium.

Velocity and Stress Correlations in Suspensions of Swimming Microorganisms: Theory and Simulation

Play Episode Listen Later May 20, 2009 18:44


This presentation discusses a model that simulates the behavior of swimming microorganisms. This model takes into account the effects of hydrodynamic interactions and large scale flows.

Session V Discussion

Play Episode Listen Later May 20, 2009 24:20


A discussion with presenters from Session V: Lev Tsimring, Aparna Baskaran, Gareth Alexander, Luca Giomi, Oleg Lavrentovich, and Patrick Underhill.

Assembling Contractile Actomyosin Bundles

Play Episode Listen Later May 20, 2009 43:28


Margaret Gardel explains the steps involved in building a contractile bundle for cell adhesion: actomyosin remodeling, F-actin network contraction and stress fiber formation.

Cell Dynamics and Active Gels

Play Episode Listen Later May 20, 2009 41:23


This presentation discusses cellular stability at the cortical layer. Internal cell elasticity and the effects of mechanical stress are also examined.

How Harvester Ant Colonies use Interaction Networks to Regulate Foraging

Play Episode Listen Later May 19, 2009 48:01


Describes how ant colonies are able to react to changing environmental conditions with each ant knowing only limited local information.

Collective Motion and Decision Making in Animal Groups

Play Episode Listen Later May 19, 2009 52:52


An analysis of the movement of various animal groups and an explanation as to how one animal's motion may be altered by the movement of other animals nearby.

Collective Motion: Some Models and Experiments

Play Episode Listen Later May 19, 2009 43:00


A look into different examples of collective motion and an explanation of various models that reproduce this behavior.

Evolution of Collective Behavior in Animal Groups

Play Episode Listen Later May 19, 2009 17:32


This talk discusses the evolutionary reasons behind collective behavior. Different models for collective behavior are also presented.

Short Talks on Various Biological Networks

Play Episode Listen Later May 19, 2009 62:38


A series of short presentations covering the following areas: bioenergetic networks, actin networks, crystalline elastomers, "bleeding" plastic, ABC transporters, single molecule biophysics, asymmetric dimer colloids, leading edge structures, lipid membranes, jammed solids, structured vesicles and beating cilia.

Physics at Work in Cell Biology and Cancer

Play Episode Listen Later May 19, 2009 55:13


This talk discusses the underlying physical forces (such as cell stress and homeostatic pressure) involved in tissue formation and cell biology.

Swarming and swirling: from granular rods to bacterial colonies

Play Episode Listen Later May 18, 2009 62:37


This presentation examines the movement of particles due to vibration and the resulting interactions between them.

Active Emulsions

Play Episode Listen Later May 18, 2009 35:37


This talk explores the properties and uses of systems whose particles can chemically change over time and interact with each other.

Mechanics of Tissue Growth

Play Episode Listen Later May 18, 2009 47:30


An examination of cell and tissue growth, with a focus on how different cell replication rates and surface pressures influence the formation of tissue.

Soft Squishy Tissue: The Depth Dependent Mechanical Properties of Articular Cartilage

Play Episode Listen Later May 18, 2009 15:08


This talk discusses the movement of cells at different depth levels within cartilage. In addition, a study designed to determine how cartilage responds to shear stress is outlined.

Session I Discussion

Play Episode Listen Later May 18, 2009 30:26


A discussion with presenters from Session I: Arshad Kudrolli, Seth Fraden, Jacques Prost and Itai Cohen.

Collective Dynamics in Swimming E. Coli Bacteria

Play Episode Listen Later May 18, 2009 43:58


This presentation discusses the various chemical signals and gradients that play a role in the swimming motion of E. coli cells.

Genomics of Emerging Order Within a Biofilm

Play Episode Listen Later May 18, 2009 47:58


An examination of the biofilm produced by Myxococcus xanthus bacteria. The cellular genome is examined for characteristics that might influence the manner in which these biofilms are formed.

The Nonlocal Hydrodynamics of Swimming Cells

Play Episode Listen Later May 18, 2009 45:31


This presentation discusses the movement of swimming cells. The effects of interaction between the flagella of different cells and the effects of wave geometry are also discussed.

Foraging Strategies for Starving and Feeding Amoeba

Play Episode Listen Later May 18, 2009 57:14


This talk discusses how different environmental conditions affect the growth strategies of amoeba cells.

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