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February '06
Features
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A Cell's Second Actsmall arrow

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Trailblazer Turned
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Optical Aspirations

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A Way Station
After Katrinasmall arrow


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FEATURES: Optical Aspirations

PAGE 6 OF 6

But microscope designers are far from done. At Janelia Farm, group leader Eric Betzig, a physicist, will see if he can build microscopes that use optical tricks to see objects far smaller than previous light microscopes. Betzig is developing what he calls the optical lattice microscope, in which multiple beams of light interfere with each other to create a three-dimensional lattice that will fill a sample with spots of light. The result, according to his theories, would be a microscope that can image objects three times smaller than today's best light microscopes and thousands of times faster. Others in the small field of ultra-high-resolution microscopy are pursuing the same goals using different designs.

"The holy grail is to see dynamically imaged living cells noninvasively, to see at the level of an individual protein molecule, and to see how the molecules interact in a cell," Betzig says. "It's many years away, but you can dream about it." grey bullet

The Challenges of Imaging

To bring cells into sharper focus, biologists need a world-class imaging facility, and that's exactly what HHMI plans at Janelia Farm. But building such a facility offers challenges of its own.

For starters, developing new microscopes takes a broad range of expertise. For example, Eric Betzig, a physicist and Janelia Farm group leader, has developed a blueprint for a new type of ultra-high-resolution light microscope (see main story) by drawing on mathematics, theoretical and experimental physics, and engineering. To make his blueprint a reality, he'll work with experimental physicists; computer scientists; and electrical, optical, and mechanical engineers to build prototypes and to develop them into reliable instruments. His long-term goal is "to make instruments that are widely used by biologists."

To develop better electron microscopes, Chen Xu, a physicist in HHMI investigator and Janelia Farm group leader Nikolaus Grigorieff's lab who will manage Janelia Farm's shared electron microscope facility, will collaborate with microscope manufacturers like FEI and JEOL to obtain the best electron beams, the best phase plates, and the most sensitive CCD detectors—and customize them. Grigorieff's team will develop fast new computer programs that choose particles to analyze, align them, and piece together a three-dimensional structure.

Developing new microscopes is only part of the challenge. "You also need a facility for [biologists] to do high-end microscopy with established techniques," says Winfried Denk, a leading microscopist who directs the department of biomedical optics at the Max Planck Institute in Heidelberg, Germany. At Janelia Farm, HHMI plans to create several core facilities, including Xu's shared electron microscope facility, to provide expert technical support to the biologists who use them.

Research institutes like the Max Planck Institute and Janelia Farm are great places to develop new technologies, says Denk. "Developing new technology involves taking risks," he says. Academic scientists, with their eye on tenure and their next grant, can't always do that. Research institutes also foster cross-disciplinary collaboration, which is critical for developing new microscopes. At Janelia Farm, physicists will rub elbows with biologists, chemists will talk with computer scientists, and molecular biologists will mingle with mathematicians, says Gerald Rubin, director of Janelia Farm. "We're going to have all those kinds of people working side by side," he says.

— Dan Ferber

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