Is a court's ruling on prosecutorial comments to which the defense objected at trial reviewed for abuse of abuse of power?

A trial court's ruling on prosecutorial comments to which the defense objected at trial is reviewed for abuse of discretion. United States v. Santiago, 46 F.3d 885, 892 (9th Cir.), cert. denied, 115 S.Ct. 2617 (1995). "[I]mproprieties in counsel's arguments to the jury do not constitute reversible error unless they prejudice the defendant and that prejudice has not been remedied by the trial judge." United States v. Lopez-Alvarez, 970 F.2d 583, 597 (9th Cir.), cert. denied, 506 U.S. 989 (1992).