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.


Bio-optics and bio-optical materials

Prof. Alison Sweeney and her colleagues believe that the reflective structures in giant clams help them grow algae. The clams use sub-wavelength structures formed from a protein called reflectin to optimize the photosynthesis of the algae living in the clam tissues.

Outreach Effort for Penn Physics and Astronomy

At the Penn Summer Science Academy (PSSA) students listen to a lecture, delivered from CERN by Professor Elliot Lipeles, on the discovery of a Higgs-like particle the day after the international announcement.


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.


Penn physicists study graphenes, atomically thin sheets of carbon atoms in a honeycomb lattice. Graphene is the prototype Dirac material hosting a solid state realization of an ultra-relativistic electron gas and accessing new phenomena that are controlled by electric and magnetic fields and by the atomic registry when graphenes are stacked.


  • Primakoff Lecture: TBA

    Rolf Heuer (CERN) Hosted by Joe Kroll

    David Rittenhouse Laboratory, A8