the patlak-keller-segel equations (pks) are widely applied to model the chemotaxis phenomena in biology. it is well-known that if the total mass of the initial cell density is large enough, the pks equations exhibit finite time blow-up. in this talk, i present some recent results on applying additional fluid flows to suppress chemotactic blow-up in the pks equations. these are joint works with jacob bedrossian and eitan tadmor.