(v): take the lead or initiative in; participate in the development of
(v): make active or more active
(v): cause to change; make different; cause a transformation
(v): make more adsorptive
(v): cause to change; make different; cause a transformation
(v): aerate (sewage) so as to favor the growth of organisms that decompose organic matter
(v): cause to change; make different; cause a transformation
(v): make (substances) radioactive
(v): cause to change; make different; cause a transformation
