Life inside ant colonies is orchestrated with diverse pheromones, but it is not clear how ants
perceive these social signals. It has been proposed that pheromone perception in ants …

… Sbalzarini and J. Cardinale for their help in the use of the “particle tracker” ImageJ plugin
(http://www.mosaic.ethz.ch/Downloads/ParticleTracker). This work was supported by the C’…

The bacterium Escherichia coli in suspension in a liquid medium swims by a succession of
runs and tumbles, effectively describing a random walk. The tumbles randomize incompletely…

The Keller-Segel system has been widely proposed as a model for bacterial waves driven
by chemotactic processes. Current experiments on Escherichia coli have shown the precise …

… , θ ij , for each task j. This is randomly drawn from a normal distribution with mean μ j and
normalized standard deviation σ j , which is given as a proportion of μ j (for example, σ = 0.3 …

… corresponding mean μ j ). Thus, … j as the mean task threshold (or mean threshold) and to
σ j as the threshold variance for task j; each can be type and/or task specific (ie, μ j X , μ j Y , σ j …

Recent years have seen a surge in methods to track and analyze animal behavior. Nevertheless,
tracking individuals in closely interacting, group-living organisms remains a challenge. …

… task j at time t, then x ij,t = 1 and x ij’,t = 0 for all j’ ≠ j; if individual i is inactive and in its rest
state, then x ij,t = 0 for all j… We refer to μ j as the mean task threshold and to σ j as the threshold …

A new tracking setup allows researchers to monitor the behavior of individual ants inside a
colony. The first results demonstrate a link between age, spatial organization and division of …

HIV-1 and related viruses require co-receptors, in addition to CD4, to infect target cells. The
chemokine receptor CCR-5 (ref. 1) was recently demonstrated to be a co-receptor for …