Frontiers

Frontiers - Nature

  • August 2009

    Re-examining a Snail's Pace

    Biologist Peter Petraitis and team discover rapid increases in shell size in the Atlantic dogwhelk.

    Nucella lapillus, the Atlantic dogwhelk, is one of the best known and most widely studied organisms in the North Atlantic Ocean. Yet until now, no one had noticed that over the past century shell lengths of these sea snails have increased in size by an average of 22.6 percent.

  • June 2009

    Jam Session

    Physicist Andrea Liu discusses research into how systems of particles transition to jammed states.

    In collaboration with her colleagues in the physics department and researchers at the University of Chicago, Andrea Liu is trying to understand how certain systems of particles come to behave like solids when they jam.

  • May 2009

    Mind's Eye View

    Penn psychologists identify neural correlates of visual and verbal cognitive styles.

    In the lab of Class of 1965 Endowed Term Professor of Psychology Sharon Thompson-Schill, the range of topics being studied is fairly broad, but one overarching theme, she explains, is an attempt to better understand differences between people.

  • May 2009

    Night Light

    Cosmologist Mark Devlin uses balloon-borne telescope to find the source of half the light in the universe.

    Just before Christmas in 2006, Mark Devlin, the Reese W. Flower Professor of Astronomy and Astrophysics, led a team of scientists to launch a telescope that would scrutinize the heavens in search of primeval galaxies at the far reaches of the universe.

  • May 2009

    The Evolution of Aging

    Graduate student Annalise Paaby studies how natural selection affects lifespan in fruit flies.

    Scientists have long known that genes play an important role in lifespan and longevity, and they have made significant progress in understanding the complex genetic mechanisms of aging. Evolutionary geneticists are now building on these discoveries to see if there is an adaptive component to life span.

  • April 2009

    DNA Collector

    Scientist Sarah Tishkoff pulls together a database of African populations—one DNA sample at a time.

    “Africa is one of the most genetically diverse regions of the world,” observes scientist Sarah Tishkoff. “It’s thought to be the site of origin of modern humans. So if we want to learn more about human evolution, we need to be looking amongst African populations.” 

  • April 2009

    Rats, REM and PTSD

    Undergraduate Benjamin Laitman looks at the microarchitecture of sleep with fear conditioning.

    While everyone may be personally familiar with the phenomenon of sleep, few of us understand what transpires in our own brains between lights out and the sound of the morning alarm. More than the absence of wakefulness or a period of rest, sleep is a complex brain state of great interest to scientists and medical practitioners working in a variety of fields.

  • March 2009

    Change and Survival

    Graduate student Lucia Peixoto investigates the molecular machinery of single cell parasites.

    “I’ve always been fascinated by biology,” says Lucia Peixoto. “I knew I wanted to do research by the time I was 12.” She read Darwin’s Voyage of the Beagle before she was a teenager. Her father bought it on a business trip to Ecuador and carried it home to her in Uruguay.

  • February 2009

    Ahead of the Curve

    Undergraduates Matthew Lewandowski and Stefan Sabo present award-winning research at the 2009 Joint Mathematics Meetings.

    Research by math and physics major Matthew Lewandowski, C’09, and math major Stefan Sabo, C’10, was honored with an award in the Undergraduate Poster Session of the 2009 Joint Mathematics Meetings of the American Mathematical Society and the Mathematical Association of A

  • February 2009

    Rising Waters

    Graduate students Andrew Kemp and Simon Engelhart bring new approaches to studying sea level change.

    Since the last ice age peaked about 20,000 years ago, waters flowing from melting glaciers back into the ocean have caused the global sea level to rise by about 410 feet. This change, though large, is one of many natural oscillations linked to the Earth’s cycle of long-term climate change.