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With a little more than spit and a sponge, researchers at Northwestern University Medical School can now test whether an ndividual is experiencing physical or emotional stress. The test measures concentration of an enzyme, called amylase, in saliva. Researh has shown that salivary amylase concentration reflects the body's level of catecholamines, substances produced by the sympathetic nervous system in response to stress.

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Experiments with hamsters show that exposure to bright light blocks the effects of serotonin in the brain, acording to a letter in Thursday's Nature.

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Nevirapine, a potent new drug used to treat HIV-infected patients, can be safely used in combination with protease inhibitors, according to one of the nation's leading AIDS researchers. Nevirapine is a member of a class of antiretroviral drugs called non-nucleoside reverse transcriptase inhibitors. Embargoed: Friday, Jan. 24, 1997, at 9 a.m. EST