Lagrangian self‐diffusion of Brownian particles in periodic flow fields

1995 ◽  
Vol 7 (2) ◽  
pp. 275-284 ◽  
Author(s):  
Roberto Mauri
Keyword(s):  
Flow Fields ◽  
Periodic Flow ◽  
Self Diffusion ◽  
Brownian Particles

scholarly journals Quantifying the Heat Dissipation from Molecular Motor’s Transport Properties in Nonequilibrium Steady States

2016 ◽  
Author(s):  
Wonseok Hwang ◽  
Changbong Hyeon
Keyword(s):  
Single Molecule ◽  
Molecular Motors ◽  
Heat Dissipation ◽  
Molecular Motor ◽  
Diffusion Constant ◽  
Nonequilibrium Steady States ◽  
Directed Motion ◽  
Mean Velocity ◽  
Self Diffusion ◽  
Brownian Particles

Theoretical analysis, which maps single molecule time trajectories of a molecular motor onto unicyclic Markov processes, allows us to evaluate the heat dissipated from the motor and to elucidate its dependence on the mean velocity and diffusivity. Unlike passive Brownian particles in equilibrium, the velocity and diffusion constant of molecular motors are closely inter-related to each other. In particular, our study makes it clear that the increase of diffusivity with the heat production is a natural outcome of active particles, which is reminiscent of the recent experimental premise that the diffusion of an exothermic enzyme is enhanced by the heat released from its own catalytic turnover. Compared with freely diffusing exothermic enzymes, kinesin-1 whose dynamics is confined on one-dimensional tracks is highly efficient in transforming conformational fluctuations into a locally directed motion, thus displaying a significantly higher enhancement in diffusivity with its turnover rate. Putting molecular motors and freely diffusing enzymes on an equal footing, our study offers thermodynamic basis to understand the heat enhanced self-diffusion of exothermic enzymes.

scholarly journals Deformation-induced actuation of cells in asymmetric periodic flow fields

2021 ◽  
Author(s):  
Sebastian W. Krauss ◽  
Pierre-Yves Gires ◽  
Matthias Weiss
Keyword(s):  
Soft Matter ◽  
Microfluidic Channel ◽  
Flow Fields ◽  
Rapid Screening ◽  
General Question ◽  
Microfluidic Channels ◽  
Periodic Flow ◽  
Topical Problem ◽  
Net Migration ◽  
Unsupervised Approach

Analyzing and sorting particles and/or biological cells in microfluidic devices is a topical problem in soft-matter and biomedical physics. An easy and rapid screening of the deformation of individual cells in constricted microfluidic channels allows, for example, the identification of sick or aberrant cells with altered mechanical properties, even in vast cell ensembles. The subsequently desired softness-specific segregation of cells is, however, still a major challenge. Moreover, aiming at an intrinsic and unsupervised approach raises a very general question: How can one achieve a softness-dependent net migration of particles in a microfluidic channel? Here we show that this is possible by exploiting a deformation-induced actuation of soft cells in asymmetric periodic flow fields in which rigid beads show a vanishing net drift.

Time-dependent self-diffusion of Brownian particles with square well interaction

Langmuir ◽  
1992 ◽  
Vol 8 (12) ◽  
pp. 2889-2897 ◽  
Author(s):  
B. Cichocki ◽  
B. U. Felderhof
Keyword(s):  
Time Dependent ◽  
Self Diffusion ◽  
Brownian Particles ◽  
Square Well
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