Word: outermost
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Koshland's theory seems to provide the answer to the enigma. The reason that enzymes are so effective, he suggests, is that they hold a molecule's constituent atoms at the proper orientation for joining. By this "orbital steering," he explains, enzymes align the outermost electrons spinning around each atom so that they can readily be shared with other atoms. Such electron sharing is at the heart of all chemical reactions...
...Some of his antibacterial finds have come from sponges collected from as far away as Australia's Great Barrier Reef and Palau in the Caroline Islands. When he arrived in Rhode Island last week, he had scarcely dried off from a scuba-diving, sponge-hunting expedition on the outermost edge of the Caribbean, between the British islands of Virgin Gorda and Anegada. Burkholder made his dives with an assistant, Robert Brody, who is completing his doctoral work on the gorgonians, or "soft corals." Together they snipped off specimens of the most familiar gorgonian, the purplish fan coral...
...striving for ultimate solutions, painters are continually testing the outermost bounds of perception. Artists from Russian Suprematist Kasimir Malevitch to Jasper Johns have turned out white-on-white paintings; Ad Reinhardt experimented with black on black. Latest and farthest-out researcher is Cali fornia's Robert Irwin, 39, who has developed pictures composed of light on light. Each painting consists of a white aluminum disk, sprayed at the edges with a subtle blush of blue, pink or grey. Mounted 15 or 20 inches from the wall, the disks are lit by four small spotlights, which cast phantasmal shadows...
...layers of the skin involved in the sun-screening process are visible under a microscope. Below the skin's outermost horny layer, or stratum corneum (see diagram), lies a germinative layer where, on exposure to sunlight, the pigment-producing cells are stimulated to produce more melanin-and a suntan. The black races (Negro, Bushman-Hottentot and Australoid), with a more abundant supply of melanin, are in effect, perpetually tanned. Members of the white race are transparent-skinned in winter, when they must make the most of the limited ultraviolet avail able to synthesize vitamin D, but they take...
...comes the green truck of the Boston Globe to drop stacks of Sunday papers at the kiosk news stand. Heave away my hearty, bail by bail, comics outermost...