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Surgical mask. A surgical mask, also known by other names such as a medical face mask or procedure mask, is a personal protective equipment used by healthcare professionals that serves as a mechanical barrier that interferes with direct airflow in and out of respiratory orifices (i.e. nose and mouth ). This helps reduce airborne transmission of ...
The beta sheet ( β-sheet, also β-pleated sheet) is a common motif of the regular protein secondary structure. Beta sheets consist of beta strands ( β-strands) connected laterally by at least two or three backbone hydrogen bonds, forming a generally twisted, pleated sheet. A β-strand is a stretch of polypeptide chain typically 3 to 10 amino ...
A public service announcement from the Government of California encouraging people to wear masks to "slow the spread". In late March 2020, some government officials began to focus on the wearing of masks to help prevent transmission of COVID-19 as opposed to protecting the wearer; former FDA Commissioner Scott Gottlieb stated in a report that face masks would be "most effective" at slowing its ...
New York Gov. Kathy Hochul said last week that she is considering banning face masks on New York City subways over concerns that the coverings obscure the identities of people committing ...
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1988: Florence Griffith Joyner. Florence Griffith Joyner took home three gold medals at the 1988 Summer Olympics and broke a new Olympic record in the 100-meter dash. But we'd be remiss not to ...
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