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She and other researchers have identified several different types of fetal cells, such as immature red blood cells and stem cells, that circulate along with placental cells in a mother's bloodstream.
Forced-air systems circulate airborne particles including dust, pollen, mold, and allergens.
The results suggest that in the early stages of a pandemic, mutations that occur during replication do not become fixed so that a uniform consensus strain circulates for some time.
When light of just the right wavelength travels down a narrow waveguide (in effect, a wire for photons) close to the resonator, it leaks into the resonator, where it circulates.
It circulates a non-toxic fluid that reportedly removes rust, scale, and lime from equipment and molds.