Arrhenius plot with lattice

hello there,

I like to print a theoretical function into my data. It would work with
"panel.curve" when it's all "normal". but unfortunately it's an
arrhenius plot and I need "1000/Temperature"(70-300K) at the x-axis.
With my data it wasn't a Problem but now I have to add this function to
the plot and don't know how to turn around the variable in the function
and adapt the plot to this.

log(n)=log(f(T^.5))-const/T

thanks

Markus