ci ▁reaction . ▁ ▁Saf ety ▁Air bor ne ▁dust ▁containing ▁am mon ium ▁pers ulf ate ▁may ▁be ▁ir rit ating ▁to ▁eye , ▁nose , ▁thro at , ▁lung ▁and ▁skin ▁upon ▁contact . ▁Ex pos ure ▁to ▁high ▁levels ▁of ▁dust ▁may ▁cause ▁difficulty ▁in ▁breath ing . ▁ ▁It ▁has ▁been ▁noted ▁that ▁pers ulf ate ▁sal ts ▁are ▁a ▁major ▁cause ▁of ▁ast hm atic ▁effects ▁in ▁women . ▁ ▁Furthermore , ▁it ▁has ▁been ▁suggested ▁that ▁expos ure ▁to ▁am mon ium ▁pers ulf ate ▁can ▁cause ▁ast hm atic ▁effects ▁in ▁hair ▁dress ers ▁and ▁reception ists ▁working ▁in ▁the ▁ha ird ress ing ▁industry . ▁ ▁These ▁ast hm atic ▁effects ▁are ▁proposed ▁to ▁be ▁caused ▁by ▁the ▁ox id ation ▁of ▁c yst e ine ▁resid ues , ▁as ▁well ▁as ▁m eth ion ine ▁resid ues . ▁ ▁References ▁ ▁External ▁links ▁International ▁Chem ical ▁Saf ety ▁Card ▁ 0 6 3 2 ▁ ▁Category : Pers ulf ates ▁Category : P ero x ides ▁Category : Am mon ium ▁comp ounds ▁Category : O x id izing ▁agents <0x0A> </s> ▁Kar en ▁H enn ig ar ▁( born ▁February ▁ 2 8 , ▁ 1 9 5 3 ) ▁is ▁a ▁Canadian ▁cur ler . ▁She ▁played ▁second ▁on ▁the ▁team ▁that ▁won ▁the ▁World ▁Senior ▁Women ' s ▁Championship ▁in ▁ 2 0 1 0 . ▁ ▁Cur ling ▁career ▁ ▁In ▁ 1 9 8 8 , ▁H enn ig