The dashed line is a linear fit of the data. (d) Characteristic time of the active solution as deduced from rheology τ rheo plotted against the (microscopic) characteristic time τ worm of a single worm at four levels of activity. From these graphs, the (microscopic) characteristic time τ worm of a single worm was determined as indicated by the dotted lines. (c) Autocorrelation function of δ ( r e ) measured at different levels of activity (i.e., different temperatures T = 5, 20, 30 ° C and in the presence of alcohol). The red shaded area in the plot indicates the six-second time period during which the sequence of images shown in the top panel were recorded. Scale bar in the sequence of images represents 2 mm. (b) Corresponding plot of the fluctuation of the end-to-end distance δ r e with respect to its averaged value versus time. Similar analysis as in the higher panel for the same worm at a lower level of activity, achieved by lowering the temperature to T = 20 ° C and exposing the worm to 5% of alcohol. (a) Sequence of images (initially recorded at a rate of 50 frames per second) of a single worm at a high level of activity in water at T = 30 ° C constrained to move in a quasi-two-dimensional thermo-controlled aquarium.
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