April 16, 2003
Raman scattering images of carbon nanotubes (A) using standard diffraction limited microscopy and (B) using the near-field Raman microscopy technique developed by Lukas Novotny of the University of Rochester and colleagues. The new technique can resolve features as small as 20 nanometers across.
Credit: The Institute of Optics, University of Rochester
Scanning electron microscope (SEM) micrograph of a spin-deposited film of collagen monomers, about 400 nm thick, spanning a 4-micron hole etched completely through a silicon wafer.
Credit: Nancy Guillen, 2002 REU student at the Nanobiotechnology Center, Cornell University
TIFF of Photo 1 (241KB)
"North Temperate Lakes LTER field staff drilling hole through ice on
Madison area lakes showing lack of snow cover and open water area in
background, February 2003."
Credit: North Temperate Lakes Long-Term Ecological Research (LTER) Site
A three-dimensional map of the "protein universe." The structures of the 500 most common protein folds were compared and similar folds were plotted near each other to create the map. The new 3-D method reveals four separate "classes" of protein folds [a(red), b(yellow), a+b(cyan), and a/b(blue)] that group into four elongated regions. Three of them merge into common region called a "fold origin" (green ball), which corresponds to small "primitive" proteins of random structure from which more complex forms evolved. In general, complex protein folds far from the origin are found in more evolved organisms than are simple folds.
Credit: Dr. Sung-Hou Kim, University of California at Berkeley and Lawrence Berkeley
National Laboratory, Berkeley, CA
Sulfide inclusion-bearing rough diamonds from the Jwaneng Mine, Botswana. This optical photomicrograph of a rough diamond shows the natural diamond growth surface. Below the surface, at the center, is a brass-colored hexagonal shaped grain of iron sulfide surrounded by an irregular black rim. This rim is caused by internal fracture of the diamond on its ascent to the earth's surface via explosive volcanism. Sulfide grains such as these are removed for sulfur isotopic analysis.
Credit: Jeff Harris, University of Glasgow, U.K.