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OOhmicresistancebehavior465●OOOcclusion—Atypeof�coprecipitationinwhichacon-taminantspeciesistrappedwithinthegrowingcrystal.Theamountofoccludedmaterialisgreatestinthepartofacrystalthatformsfirst[i].Occlusionoforganicaddi-tivescanoccurin�electrodeposition,e.g.,incorporationofcumarininnickel[ii].Refs.:[i]SkoogD,WestD,HollerF()Fundamentalsofanalyti-calchemistry.SaundersCollegePublishing,NewYork;[ii]PauvonicM,SchlesingerM()Fundamentalsofelectrochemicaldeposition,ndedn.Wiley,NewYork,pFGOhm,GeorgSimon(CourtesyofGeorg-Simon-Ohm-FachhochschuleNürnberg)(Mar.,,Erlangen,Germany–July,,Mu-nich,Germany)OhmwasaGermanphysicistwhostud-iedfundamentalprinciplesofelectricityandelectro-magnetism[i,ii].Hediscoveredthelaw,namedafterhimOhm’slaw,whichstatesthatthecurrent(I)flow-ingthrougha�conductorisdirectlyproportionaltothepotentialdifference(voltage,U)andinverselypro-portionaltotheresistance(R):I=U/R(Ohmequa-tion)[iii].The�resistanceunitOhm(SI)wasnamedafterhim.Refs.:[i]PourprixB()A