About 10 years ago, Alan Garfinkel, a professor in the life sciences department at the University of California, Los Angeles, got a call. It was from his dean, who said that the department had ...

To minimize environmental contamination, each dental calculus sample was UV-treated for 15 min on each side, soaked in 2 ml of 5% bleach for 3 min, rinsed in 90% ethanol for 1 min, and dried at room ...