Enzyme preservation and dynamics in plasticized trehalose glasses with phi sub glycerol ( down triangle ) 0, ( square ) 0.05, and ( circle ) 0.10. Panel ( a ) shows 1 / mean square atomic displacement, which is proportional to local dynamics ( see text ). Panel ( b ) shows HRP activity lifetimes, and panel ( c ) shows Y A D H activity lifetimes. Panel ( d ) shows apparent activation energies as a function of glycerol content measured by HRP lifetimes ( H ), Y A D H stability ( Y ), and 1 / mean square atomic displacement ( n super naught ). Error bars represent standard uncertainties of plus and minus one standard deviation.

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