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Chapter
The Evolutionary Ecology of Multicellularity: The Volvocine Green Algae as a Case Study
The volvocine green algae in the order Volvocales are an ideal modelsystem for studying the unicellular-multicellular transition since they comprise an assemblage of lineages featuring varying degrees of compl...
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Chapter
Cells Acting as Lenses: A Possible Role for Light in the Evolution of Morphological Asymmetry in Multicellular Volvocine Algae
The volvocine green algae have been extensively used to address various questions related to the evolution of multicellularity and cell differentiation, in terms of the genetics, developmental constraints, and...
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Article
Roles of root border cells in plant defense and regulation of rhizosphere microbial populations by extracellular DNA ‘trap**’
As roots penetrate soil, specialized cells called ‘border cells’ separate from root caps and contribute a large proportion of exudates forming the rhizosphere. Their function has been unclear. Recent findings ...
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Chapter and Conference Paper
Individual to Collective Dynamics of Swimming Bacteria
Spatial order and fast collective coherent dynamics of populations of the swimming bacteria Bacillus subtilis emerges from local interactions and from flows generated by the organisms’ locomotion. The transition ...
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Chapter
Fluid dynamics of self-propelled microorganisms, from individuals to concentrated populations
Nearly close-packed populations of the swimming bacterium Bacillus subtilis form a collective phase, the “Zooming BioNematic” (ZBN). This state exhibits largescale orientational coherence, analogous to the molecu...
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Chapter and Conference Paper
Large-Scale Collective Behavior of Swimming Microorganisms at High Concentrations
Suspensions of motile bacteria such as Bacillus subtilus or E. coli form a dynamical state exhibiting extended spatio-temporal organization at concentrations near the maximum allowed by steric repulsion. The vis...
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Article
Fluid dynamics of self-propelled microorganisms, from individuals to concentrated populations
Nearly close-packed populations of the swimming bacterium Bacillus subtilis form a collective phase, the “Zooming BioNematic” (ZBN). This state exhibits large-scale orientational coherence, analogous to the molec...
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Article
Motility, mixing, and multicellularity
A fundamental issue in evolutionary biology is the transition from unicellular to multicellular organisms, and the cellular differentiation that accompanies the increase in group size. Here we consider recent ...
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Chapter and Conference Paper
Mutual Dynamics of Swimming Microorganisms and Their Fluid Habitat
“Organisms alter their material environment, and their environment constrains and naturally selects organisms.” Lenton’s [17] statement applies especially well to populations of swimming micro-organisms. The mutu...
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Chapter and Conference Paper
Complementarity of Physics, Biology and Geometry in the Dynamics of Swimming Micro-Organisms
1 Introduction
2 Hydrodynamics
3 The Distribution of Swim...
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Article
Hydrodynamic focusing of motile algal cells
The swimming direction of algal cells can be guided so that the cells are focused into a concentrated beam. This directed locomotion, or taxis, results from the orientation of the cells' axes by compensating g...
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Chapter
Gyrotactic Buoyant Convection and Spontaneous Pattern Formation in Algal Cell Cultures
Regular convection patters may form spontaneously in isothermal liquids which contain swimming microorganisms. The energy for this dissipative process is supplied by the swimmers. Individual cell trajectories ...
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Article
Leukotaxis and serum immunoglobulins in the aged
Simultaneous assessments of PMN chemotactic and thermotactic responses and serum concentrations of IgG and IgA were carried out in 20 young (18–33 years) and 17 aged (61–91 years) community volunteers. IgG cor...
