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MEDICINE

Heart attack survival: Women who suffer heart attacks die more often than men once they reach the hospital, apparently because they tend to be older and weaker when stricken, according to a study in today's Journal of the American Medical Association. The finding was based on 1,122 male and female heart attack patients aged 30 to 74. In the study 14 percent of the women died in the hospital compared to 9 percent of the men.AZT treatment: Treatment with the drug AZT may benefit the roughly 500,000 Americans who are infected with the AIDS virus, but haven't developed the disease, researchers said. According to the Centers for Disease Control, many of those people already have weakened immune systems and could be helped by the drug.

Biological clocks: Researchers say they have pinpointed the part of the brain that serves in hamsters as the animal's biological clock, and they said humans' daily rhythms appear to be governed by the same mechanism. By transplanting tissue from the brains of hamsters with abnormal clocks into normal hamsters, scientists at the University of Virginia said they confirmed earlier suspicions that animals' inner time clocks are regulated by a small area deep in the hypothalamus known as the suprachiasmatic nucleus, or SCN. Humans and other mammals follow internal time patterns known as circadian rhythms that regulate their waking and sleeping, their periods of activity and resting, body temperature changes and dozens of other biological activities, even in the absence of sunlight.

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