\begin{titlepage}
\sffamily  %to sans serif

\begin{center}
%deutsch, Dr. rer. nat.
\selectlanguage{ngerman}
\null
\vspace{2em}
\Large \textbf{Titel der Dissertation}\\
\vspace{6em}
\large \textbf{Dissertation} \\ \textbf{zur Erlangung des akademischen Grades} \\ \textbf{"`doctor rerum naturalium"' (Dr. rer. nat.)} \\
\vspace{8em}
\large \textbf{vorgelegt dem Rat der Fakult\"{a}t~f\"{u}r~Biowissenschaften}\\ \textbf{der Friedrich-Schiller-Universit\"{a}t Jena} \\
\vspace{5em}
\large \textbf{von} $\dots$ \\ \vspace{1em} %bereits erworbene akademische Grade, Vor- und Zuname
\large \textbf{geboren am} $\dots$ \textbf{in} $\dots$

%deutsch, Ph.D.
%\selectlanguage{ngerman}
%\null
%\vspace{2em}
%\Large \textbf{Titel der Dissertation}\\
%\vspace{6em}
%\large \textbf{Dissertation} \\ \textbf{zur Erlangung des akademischen Grades} \\ \textbf{"`Doctor of Philosophy"' (Ph.D.)} \\
%\vspace{8em}
%\large \textbf{vorgelegt dem Rat der Fakult\"{a}t~f\"{u}r~Biowissenschaften}\\ \textbf{der Friedrich-Schiller-Universit\"{a}t Jena} \\
%\vspace{5em}
%\large \textbf{von} $\dots$ \\ \vspace{1em} %bereits erworbene akademische Grade, Vor- und Zuname
%\large \textbf{geboren am} $\dots$ \textbf{in} $\dots$

%english, Dr. rer. nat.
%\selectlanguage{english}
%\null
%\vspace{2em}
%\Large \textbf{Title of Dissertation}\\
%\vspace{6em}
%\large \textbf{Dissertation} \\ \vspace{1em} To Fulfill the \\ Requirements for the Degree of \\ \textbf{"doctor rerum naturalium" (Dr. rer. nat.)} \\
%\vspace{8em}
%\large \textbf{Submitted to the Council of the Faculty}\\ \textbf{of Biological Sciences}\\ \textbf{of the Friedrich Schiller University Jena} \\
%\vspace{5em}
%\large \textbf{by} $\dots$ \\ \vspace{1em} %academic degrees achieved so far, Name, Surname
%\large \textbf{born on} $\dots$ \textbf{in} $\dots$

%english, Ph.D.
%\selectlanguage{english}
%\null
%\vspace{2em}
%\Large \textbf{Title of Dissertation}\\
%\vspace{6em}
%\large \textbf{Dissertation} \\ \vspace{1em} To Fulfill the \\ Requirements for the Degree of \\ \textbf{"Doctor of Philosophy" (Ph.D.)} \\
%\vspace{8em}
%\large \textbf{Submitted to the Council of the Faculty}\\ \textbf{of Biological Sciences}\\ \textbf{of the Friedrich Schiller University Jena} \\
%\vspace{5em}
%\large \textbf{by} $\dots$ \\ \vspace{1em} %academic degrees achieved so far, Name, Surname
%\large \textbf{born on} $\dots$ \textbf{in} $\dots$

\end{center}

\rmfamily  %and back to roman font
\end{titlepage}