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IMAGE: The microdiamonds used as biological tracers are about 200 microns across, less than one-hundredth of an inch. They fluoresce red but can also be hyperpolarized, allowing them to be detected. view more
Credit: Ashok Ajoy, UC Berkeley
When doctors or scientists want to peer into living tissue, there s always a trade-off between how deep they can probe and how clear a picture they can get.
With light microscopes, researchers can see submicron-resolution structures inside cells or tissue, but only as deep as the millimeter or so that light can penetrate without scattering. Magnetic resonance imaging (MRI) uses radio frequencies that can reach everywhere in the body, but the technique provides low resolution about a millimeter, or 1,000 times worse than light.
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UC Berkeley professor emeritus of chemistry and former director of Lawrence Berkeley National Laboratory, or Berkeley Lab, David Shirley died March 29 at the age of 87 due to age-related illnesses.
Remembered by friends and colleagues as being someone with great scientific passion, ceaseless generosity and immense devotion to his students, Shirley made great contributions to his field throughout his time on campus. Among other achievements, Shirley helped pioneer research on electron spectroscopy and initiated the creation of Berkeley Lab’s Advanced Light Source, according to a campus press release.
“He had a generosity of spirit and was always looking out for his community,” said UC Berkeley Executive Vice Chancellor and Provost Paul Alivisatos, a former colleague of Shirley. “That was the type of man he was.”
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