Functional Imaging in the Brain

A representation of blood flow changes in a rat brain during cortical spreading depression. In the experiment, a large local concentration of KCl initiates a 'wave' of neuronal depolarization that propagates outward from a central point and then repeats itself.  The figure shows images of blood flow in four parallel planes located within 3 millimeters of the skull.

 

Air-fluidized grains

Spatiotemporal heterogenous dynamics in air-fluidized grains near jamming. The colors represent the average speed over a time interval large enough for grain-sized rms displacement. The most mobile grains are in red, the least are in blue, across the rainbow. Note the stringy correlations of the mobile grains in red. From the lab of Prof. Doug Durian.

Carbon Nanotube FET Sensor

Schematic of a carbon nanotube FET sensor functionalized with an antibody to a Lyme disease biomarker protein.  The insulating substrate is shown in pink.  When antigen molecules bind to the antibody, the electrical characteristics of the FET are altered.

From the lab of Prof. Charlie Johnson.

Supernovae from the Sloan Digital Sky Survey

Part of the images of all the supernovae from the 2005-2007 observing campaigns of the Sloan Digital Sky Survey.

 

Nanoscale Electronic Nose

Prof. Charlie Johnson's group at Penn have coupled olfactory receptor proteins from mice to carbon nanotubes to create a prototype electronic nose. Olfactory receptors are embedded in nanodiscs that mimic the environment of the olfactory cell membrane.  Odorant molecules bind to the receptor, which produces an electrical response in the carbon nanotube (gray cylinder).

 

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