Word: impairs
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Dates: during 1990-1999
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...question, scientists must first understand what causes Alzheimer's, and right now they have only intriguing clues. The most popular hypothesis holds that the disease process starts when a protein called beta amyloid accumulates outside nerve cells, forming the deposits known as plaques. Among other things, plaques appear to impair the ability of neurons to absorb glucose from the bloodstream, generating an energy crisis inside the cell. A competing hypothesis maintains that Alzheimer's begins not with beta amyloid but with a protein called tau. Abnormal variants of this protein, say scientists, clutter the interiors of neurons with tangled filaments...
...immigrants must realize that if they are to be accepted by the United States, they must accept the United States, faults and all, in turn. They must show the proper respect for the country that is now theirs. Current English-only legislation will not impair my ability to live and celebrate my Mexican heritage or pass it on to my children. I will not be de-humanized by being required to deal with my government in English. The current bill requires only one very simple way for immigrants and their descendants to respect the country they have freely chosen...
...Medical Area alone, too many dangerous streets impair his traveling, he says...
Other students charge that even light marijuana use can impair cognitive abilities...
...student, who considers herself a former occasional smoker, says inhaling marijuana also can impair one's control...