Frankfurt/Main Airport is some 30 kilometers from Mainz, direct trains connecting both. For train schedules please try the travel information services run by the RMV regional transport authority and Deutsche Bahn ("Frankfurt Flughafen" -> "Mainz Hauptbahnhof").
The Institute for Physiologic Chemistry is located on the campus of the Johannes Gutenberg University Mainz which can be reached by bus lines no. 6, 6A, 28, 54, 55, 56, 57, 58, 64, 65, 68 from Mainz Central Station.
Ackermannweg which is the next bus stop to the institute is covered by bus lines 54, 68, 69 and 650.
Detailed information about bus schedules is available on the web sites of the Mainzer Verkehrsgesellschaft.
For train schedules to Mainz Central Station ("Mainz Hauptbahnhof") please try Deutsche Bahn.