Word: signallers
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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...
...move that could signal the beginning of much broader use of Crimson Cash throughout the University, two major library systems have decided to adopt that payment method for photocopying services...
...move that could signal the beginning of much broader use of Crimson Cash throughout the University, two major library systems have decided to adopt that payment method for photocopying services...
...space physicist at NASA Goddard Space Flight Center, is that all this is occurring despite the fact that we're currently in a solar minimum--the interval of relative calm that reigns between the end of one 11-year sunspot cycle and the beginning of another. Sunspots always signal more violent solar activity than average. But, says Gurman: "We now know that there's no such thing as a quiet...