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Science News for May 21, 2002


Studying the strength of protein bonds one molecule at a time

Penn researchers used laser tweezers to study the strength of ligand-receptor binding in platelets, refining the paradigm of how blood clots form. They found that changes in integrin's ability to bind to fibrinogen are regulated by the cell as an all-or-none phenomenon with only one functional state compatible with binding.

SourceUniversity of Pennsylvania School of Medicine·JournalProceedings of the National Academy of Sciences·DateMay 21, 2002

Menopause dashes sex life

A study of Melbourne women found a decline in sexual interest, arousal, and frequency during menopause, with estradiol levels plummeting. Relationship factors, not hormonal changes, have the greatest impact on sexual response.

SourceUniversity of Melbourne·JournalFertility and Sterility·DateMay 21, 2002

Jefferson scientists create first animal model of common type of leukemia

Researchers at Thomas Jefferson University developed an animal model of chronic lymphocytic leukemia (CLL), a disease characterized by uncontrolled proliferation of white blood cells. The model enables scientists to investigate biochemical and molecular mechanisms underlying the disease and test potential new drugs.

SourceThomas Jefferson University·JournalProceedings of the National Academy of Sciences·DateMay 21, 2002

Grandparent divorce weakens relationships with grandchildren

Research by Penn State's King found that ever-divorced grandparents live farther away from their grandchildren than married grandparents. Grandfathers report less contact and higher conflict with grandchildren compared to grandmothers. However, a good parent-grandparent relationship can mitigate the negative influence of divorce.