FIG 1.
Measurement schematic. (a) The buoyant mass of individual spores is determined as they pass through a fluid channel embedded in a resonating cantilever. (b) Spores can also be trapped at the end of the cantilever (cross section) by centrifugal force. (c) The fluid within the resonator can be exchanged with the fluid in the other bypass, while the spore remains trapped. The expected mass signal is demonstrated for spore capture (d) and for slow (e) and fast (f) H2O-to-D2O exchange. freq., frequency.