Ulster too strong for Warriors
Ulster flanker Chris Henry made some sustained second-half pressure count as last season's Heineken Cup runners-up secured their second win of this season's tournament and condemned Glasgow to another loss with a 19-8 triumph at Scotstoun.
Henry touched down as Ulster drove over after dominating the early stages of the second half in front of a sell-out crowd.
Peter Horne gave Glasgow the lead with a penalty in a tight opening half, but Paddy Jackson, who claimed four penalties and a conversion, proved the more competent kicker throughout the contest and Glasgow replacement Niko Matawalu's late try proved only a consolation.
Northampton suffered a defeat to Castres for the second year running after being outclassed and outfought in a 21-16 result under the lights of the Stade Ernest Wallon in Toulouse.
A George Pisi try was not enough for the Aviva Premiership leaders, as their French opposition edged to victory. Paul Bonnefond crossed over early on for the home side with Antonie Classen adding one of his own in the second half, while Romain Teulet was on target with a conversion and a penalty.
Rory Kockott took advantage of more lapses in Northampton's defending to convert another penalty as Remi Tales finished off the scoring as Castres claimed the victory with a drop-goal despite three Stephen Myler penalties and a conversion.