Word: signalling
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Dates: during 1990-1999
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Meet Harold Rosen, a slight, gentle-mannered 70-year-old Cal Tech Ph.D. who predates the space age by a dog's age. Yet every time you watch a live-television feed from distant parts of the earth, chances are the signal has bounced off one of the satellites he helped design for Hughes Aircraft in his 37-year career. "He is uncommonly brilliant," says his biggest fan, younger brother Ben, 63. "He's a national treasure...
...bigger headache is that unlike the telephone system, cable networks were designed for one-way communication: a single strong signal transmitted down a tree-and-branch system to thousands of passive users who aren't sending any data back. Sending a high-bandwidth signal from head-end to home in such a system is easy; getting thousands of individual signals back upstream--which is what a neighborhood of people E-mailing one another represents--turns out to be a nightmare...
...victory of Robert M. Hyman '98 and Lamelle D. Rawlins '99 in the first-ever popular elections for Undergraduate Council officers was supposed to signal the advent of a "New Undergraduate Council...
Scientists consider receptors--which are specially tailored protein molecules--and the substances that bind to them to be the critical junction in the ongoing chemical processes that underlie thinking, feeling, dreaming and remembering. For an electrical signal to travel from neuron to neuron in the brain, it must cross a minuscule gap, the synapse, between them. A number of different chemical messengers known as neurotransmitters ferry the signal across the synapse and then lock on to receptors that lie on the membrane of the next nerve cell in line...
Every man on occasion has difficulty maintaining an erection, say doctors. But continued failure to become aroused may signal a medical problem. The immediate cause of impotence is a lack of blood flow to the penis, and a wide range of treatments is available. Men can take pills that dilate the blood vessels and help facilitate an erection, or they can use vacuum instruments that draw blood into the penis. On the more invasive side, they can inject drugs into the base of the penis that dilate blood vessels, or patients can undergo surgery for penile implants...