UW science photo takes second in national contest

The image, "Polymazing," appears in the Sept. 26 issue of Science, which Eun herself finds somewhat amazing, considering the subject of her photo arose completely by accident. "I thought something was wrong," laughs Eun, who works with biochemistry professor, Doug Weibel.

High-resolution images of "Polymazing" and Eun can be downloaded at http://www.news.wi … unImage.html

Last spring, Eun grafted a thin sheet of water-loving "hydrogel" onto a material called PDMS, thinking the combination might improve the function of a tiny cell culture system she was building. But when she added water, something surprising happened: While the hydrogel absorbed the liquid and expanded, the PDMS stayed in place, putting strain on the hydrogel and causing it to buckle.

Fearing her technique hadn't worked, she showed the strange pattern of wrinkles to Weibel.

"And he said, 'That's actually really pretty, why don't you take a picture?'" recalls Eun.

But the image, which was taken under a microscope, isn't merely pretty. The physical phenomenon responsible for the buckling is well-studied and emerges in many places in nature, Eun says. Our fingertips get crinkly in the bathtub, for example, because the flexible epidermis swells with water, while the underlying tissue it's attached to does not, causing the skin to wrinkle.

According to the competition's Web site, NSF and Science hold the annual challenge to "celebrate the grand tradition" of images and illustration in scientific research. Doing well in the contest is now becoming something of a tradition for Weibel. While at Harvard University, he contributed to an entry called "Tiny Metal Pathways" that won second place in last year's competition.

Source: University of Wisconsin-Madison