▁D arg an ▁from ▁the ▁United ▁States . ▁Light ▁wel ter we ights ▁were ▁limited ▁to ▁those ▁box ers ▁we igh ing ▁less ▁than ▁or ▁equal ▁to ▁ 6 0 ▁kil og rams . ▁ ▁The ▁competition ▁was ▁a ▁straight ▁single - el im ination ▁tournament . ▁Both ▁semif inal ▁los ers ▁were ▁awarded ▁bronze ▁med als , ▁so ▁no ▁box ers ▁competed ▁again ▁after ▁their ▁first ▁loss . ▁B outs ▁consisted ▁of ▁four ▁r ounds ▁of ▁two ▁minutes ▁each , ▁with ▁one - min ute ▁breaks ▁between ▁r ounds . ▁P unch es ▁scored ▁only ▁if ▁the ▁white ▁area ▁on ▁the ▁front ▁of ▁the ▁glo ve ▁made ▁full ▁contact ▁with ▁the ▁front ▁of ▁the ▁head ▁or ▁tor so ▁of ▁the ▁oppon ent . ▁Five ▁jud ges ▁scored ▁each ▁bout ; ▁three ▁of ▁the ▁jud ges ▁had ▁to ▁signal ▁a ▁scoring ▁p unch ▁within ▁one ▁second ▁for ▁the ▁p unch ▁to ▁score . ▁The ▁winner ▁of ▁the ▁bout ▁was ▁the ▁box er ▁who ▁scored ▁the ▁most ▁valid ▁p unch es ▁by ▁the ▁end ▁of ▁the ▁bout . ▁ ▁Results ▁All ▁times ▁are ▁Central ▁Standard ▁Time ▁( UTC - 6 ). ▁ ▁Bra cket ▁ ▁References ▁ ▁Category : Box ing ▁at ▁the ▁ 2 0 1 1 ▁Pan ▁American ▁Games <0x0A> </s> ▁In ▁en zym ology , ▁a ▁[ cy to chrome ▁c ] - argin ine ▁N - m eth yl trans fer ase ▁() ▁is ▁an ▁en zym e ▁that ▁catal y zes ▁the ▁chemical ▁reaction ▁ ▁S - aden os