In this paper we develop a field-theoretic description for run and tumble chemotaxis, based on density functional of crystalline materials modified to capture orientational ordering. We show that framework, with its in-built multi-particle interactions, soft-core repulsion elasticity is ideal describing continuum collective phases particle resolution, but diffusive timescales. our model exhibit...

We study a model of bacterial dynamics where two interacting random walkers perform run-and-tumble motion on a one-dimensional lattice under mutual exclusion and find an exact expression for the probability distribution in the steady state. This stationary distribution has a rich structure comprising three components: a jammed component, where the particles are adjacent and block each other; an...

Chemotaxis is the directed motion of an organism toward environmental conditions it deems attractive and/or away from surroundings it finds repellent. Movement of flagellated bacteria such as Escherichia coli can be characterized as a sequence of smooth-swimming runs punctuated by intermittent tumbles. Tumbles last only a fraction of a second, which is sufficient to effectively randomize the di...

It has been recently shown that human adolescents with Attention Deficit/Hyperactivity Disorder (ADHD) have frontal lobe deficits, especially on the right sides of their brains (). ADHD is commonly treated with psychostimulants which may have adverse consequences. Hence, less invasive therapies need to be developed. In the present work, we tested the ability of right frontal lesions to induce h...

Bacterial chemotaxis is a paradigm for how environmental signals modulate cellular behavior. Although the network underlying this process has been studied extensively, we do not yet have an end-to-end understanding of chemotaxis. Specifically, how the rotational states of a cell's flagella cooperatively determine whether the cell 'runs' or 'tumbles' remains poorly characterized. Here, we measur...

An optimal combustion process within an engine block is central to the performance of many motorized vehicles. Associated with this process are two important patterns of flow: swirl and tumble motion, which optimize the mixing of fluid within each of an engine’s cylinders. The simulation data associated with in-cylinder tumble motion within a gas engine, given on an unstructured, timevarying an...

of Research Findings The project has now completed two crop-years of experimentation. Four more crop-years are required for all crop rotations to complete a full cycle. This report covers the 2004-05 cropyear results. CBARC experiment (Moro): Grain yields of winter wheat following fallow (conventional or chemical) produced significantly higher yields than yields of annual cropping systems invol...