Being able to see mico-organisms or even single cells in a microfluidics device is useful for several reasons (e.g. observing responses to different environmental or chemical changes). Now, that is possible based on work engineers at Penn State have carried out. In their own words: “we trapped microbubbles within predefined sidewall microcavities inside a microchannel. In an acoustic field, trapped microbubbles were driven into oscillatory motion generating steady microvortices which were utilized to precisely rotate colloids, cells and entire organisms (that is, C. elegans).” The illustrations in this piece are quite good.   MORE