Results 1 to 10 of about 1,538 (25)
Physical Constraints on Motility with Applications to Possible Life on Mars and Enceladus [PDF]
The Planetary Science Journal, Vol. 2, No. 3, 101 (2021), 2021 Motility is a ubiquitous feature of microbial life on Earth, and is widely regarded as a promising biosignature candidate. In the search for motile organisms, it is therefore valuable to have rough estimates for the number of such microbes that one may expect to find in a given area or volume.
arxiv +1 more source
Information and motility exchange in collectives of active particles [PDF]
Soft Matter, 2020, Advance Article, 2020 We examine the interplay of motility and information exchange in a model of run-and-tumble active particles where the particle's motility is encoded as a bit of information that can be exchanged upon contact according to the rules of AND and OR logic gates in a circuit.
arxiv +1 more source
Enhanced motility in a binary mixture of active nano/microswimmers [PDF]
Nanoscale 2020, 2020 It is often desirable to enhance the motility of active nano- or microscale swimmers such as, e.g., self-propelled Janus particles as agents of chemical reactions or weak sperm cells for better chances of successful fertilization. Here we tackle this problem based on the idea that motility can be transferred from a more active guest species to a less ...
arxiv +1 more source
Dynamic clustering of passive colloids in dense suspensions of motile bacteria [PDF]
, 2021 Mixtures of active and passive particles are predicted to exhibit a variety of nonequilibrium phases. Here we report a dynamic clustering phase in mixtures of colloids and motile bacteria. We show that colloidal clustering results from a balance between bond breaking due to persistent active motion and bond stabilization due to torques that align ...
arxiv +1 more source
Effect of motility on the transport of bacteria populations through a porous medium [PDF]
Phys. Rev. Fluids 4, 013102 (2019), 2018 The role of activity on the hydrodynamic dispersion of bacteria in a model porous medium is studied by tracking thousands of bacteria in a microfluidic chip containing randomly placed pillars. We first evaluate the spreading dynamics of two populations of motile and non-motile bacteria injected at different flow rates.
arxiv +1 more source
Clustering of bacteria with heterogeneous motility [PDF]
Physical Review E 101 (2020) 022612, 2020 We study the clustering of a model cyanobacterium \textit{Synechocystis} into microcolonies. The bacteria are allowed to diffuse onto surfaces of different hardness, and interact with the others by aggregation and detachment. We find that soft surfaces give rise to more microcolonies than hard ones. This effect is related to the amount of heterogeneity
arxiv +1 more source
On the parabolic-elliptic Keller-Segel system with signal-dependent motilities: a paradigm for global boundedness and steady states [PDF]
, 2020 This paper is concerned with a parabolic-elliptic Keller-Segel system where both diffusive and chemotactic coefficients (motility functions) depend on the chemical signal density. This system was originally proposed by Keller and Segel in \cite{KS-1971-JTB2} to describe the aggregation phase of {\it Dictyostelium discoideum} cells in response to the ...
arxiv +1 more source
Dispersion of motile bacteria in a porous medium [PDF]
, 2022 Understanding flow and transport of bacteria in porous media is crucial to technologies such as bioremediation, biomineralization or enhanced oil recovery. While physicochemical bacteria filtration is well-documented, recent studies showed that bacterial motility plays a key role in the transport process.
arxiv +1 more source
Cytoskeleton and Cell Motility [PDF]
in Encyclopedia of Complexity and System Science, pp. 1738-1774,
Robert A. Meyers Ed., Springer New York (2009). ISBN: 978-0-387-75888-6
(Print), 978-0-387-30440-3 (Online), 2011 The present article is an invited contribution to the Encyclopedia of Complexity and System Science, Robert A. Meyers Ed., Springer New York (2009). It is a review of the biophysical mechanisms that underly cell motility. It mainly focuses on the eukaryotic cytoskeleton and cell-motility mechanisms.
arxiv +1 more source
Fractal aggregation of active particles [PDF]
Phys. Rev. E 98, 052603 (2018), 2018 We study active run-and-tumble particles with an additional two-state internal variable characterizing their motile or non-motile state. Motile particles change irreversibly into non-motile ones upon collision with a non-motile particle. The system evolves towards an absorbing state where all particles are non-motile.
arxiv +1 more source