January 13, 2016 at 02:52AM

Today I Learned: 1) Mammograms are around 85% sensitive and about 90% selective. That is, if you have breast cancer, a mammogram will tell you that about 85% of the time; if you don't have breast cancer, a mammogram will tell you you *do* have breast cancer about 10% of the time. 2) There are stationary-phase-specific promoters, which activate downstream genes only when bacterial density is very high (specifically, when RpoS (RNA polymerase sigma) is expressed). 3) ...what I'm supposed to do at TA sessions....