20 August 1999
Vol 285, Issue 5431

About The Cover

Cover image expansion

COVER Cross section of an unstained rat retina (image width, ~500 µm) viewed with an infrared microscope/spectrometer with all-reflecting differential interference contrast optics. Imaging the molecular chemistry of individual retinal layers is made possible by combining microscopy and infrared spectroscopy. This emerging technology, used in materials and forensic sciences, is now applied to biological research. See page 1224 [Photo: D. L. Wetzel and S. M. LeVine; T. J. Tague Jr. (Spectra-Tech, Inc.)]