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\textcolor{Blue2}{~~University of Notre Dame~~}}% |
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\textcolor{SaddleBrown}{~~Matthew Meineke~~}}% |
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% ---------------------- |
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% | Title | |
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% ---------------------- |
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\title{A Mezzoscale Model for Phospholipid MD Simulations} |
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\author{Matthew A. Meineke\\ |
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Department of Chemistry and Biochemistry\\ |
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University of Notre Dame\\ |
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Notre Dame, Indiana 46556} |
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\date{\today} |
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%------------------------------------------------------------------- |
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% Begin Document |
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\begin{document} |
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%\maketitle |
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\nobibliography{canidacy_slides} |
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% Slide 0 Title slide |
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\begin{slide} |
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\begin{center} |
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\bfseries |
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\fontsize{24pt}{30pt}\selectfont \color{Black} |
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A Mezzoscale Model for Phospholipid MD Simulations \par |
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\fontsize{16pt}{20pt}\selectfont \color{Green3} |
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Matthew A. Meineke\par |
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\fontsize{12pt}{15pt}\selectfont \color{Purple2} |
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Department of Chemistry and Biochemisty \par |
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University of Notre Dame \par |
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Notre Dame, IN 46556 \par |
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\fontsize{12pt}{15pt}\selectfont \color{Red} \date{today} \par |
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\end{center} |
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\end{slide} |
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|
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|
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% Slide 1 |
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\begin{slide} {\LARGE Talk Outline} |
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\begin{itemize} |
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|
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\item Discussion of the research motivation and goals |
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\item Methodology |
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\item Discussion of current research and preliminary results |
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\item Future research |
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|
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\end{itemize} |
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\end{slide} |
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|
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|
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% Slide 2 |
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|
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\begin{slide} |
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|
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\centerline{\LARGE Motivation A: Long Length Scales} |
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|
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\begin{wrapfigure}{r}{60mm} |
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|
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\epsfxsize=45mm |
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\epsfbox{ripple.epsi} |
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|
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\end{wrapfigure} |
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|
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|
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%\epsfbox{ripple.epsi} |
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%\begin{floatingfigure}{0.45\linewidth} |
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% \incffig{ripple.epsi} |
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%\end{floatingfigure} |
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|
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|
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|
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\mbox{} |
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Ripple phase: |
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\begin{itemize} |
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|
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\item |
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The ripple (~$P_{\beta'}$~) phase lies in the transition from the gel |
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to fluid phase. |
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|
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\item |
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Periodicity of 100 - 200 $\mbox{\AA}$\footcite{Cevc87} |
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|
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\item |
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Current simulations have box sizes ranging from 50 - 100 $\mbox{\AA}$ |
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on a side.\footcite{Venable93}\footcite{Heller93} |
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|
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\end{itemize} |
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\vspace{10mm} |
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\end{slide} |
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|
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|
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\begin{slide}{\LARGE Motivation B: Long Time Scales} |
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|
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\begin{itemize} |
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|
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\item |
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Drug Diffussion |
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\begin{itemize} |
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\item |
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Some drug molecules may spend appreciable amountsd of time in the |
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membrane |
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|
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\item |
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Long time scale dynamics are need to observe and charecterize their |
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actions |
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\end{itemize} |
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|
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\item |
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Bilayer Formation Dynamics |
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\begin{itemize} |
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\item |
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Current bilayer simulations indicate that lipids can take nearly |
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20 ns to form completely.\footcite{Marrink01} |
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\end{itemize} |
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\end{itemize} |
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\end{slide} |
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|
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|
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% Slide 4 |
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|
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\begin{slide}{\LARGE Length Scale Simplification I} |
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|
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|
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Replace any charged interactions of the system with dipoles. |
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|
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\begin{itemize} |
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\item Allows for computational scaling approximately by $N$ for |
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dipole-dipole interactions. |
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\begin{itemize} |
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\item Relatively short range, $\frac{1}{r^3}$, interactions allow |
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the application of computational simplification algorithms, |
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ie. neighbor lists. |
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\end{itemize} |
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|
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\item In contrast, the Ewald sum, needed for calculating charge - charge |
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interactions, scales approximately by $N \log N$. |
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\end{itemize} |
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\end{slide} |
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|
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\begin{slide}{\LARGE Length Scale Simplification II} |
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|
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Use unified models for the water and the lipid chain. |
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|
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\begin{itemize} |
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\item |
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Drastically reduces the number of atoms and interactions to simulate. |
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|
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\end{itemize} |
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|
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|
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|
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\begin{figure} |
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%\epsfxsize=30mm |
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%\leavevmode |
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\begin{center} |
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\includegraphics[width=50mm,angle=-90]{reduction.epsi} |
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\end{center} |
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\end{figure} |
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|
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|
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\end{slide} |
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|
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|
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% Slide 5 |
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|
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\begin{slide}{Time Scale Simplification} |
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\begin{itemize} |
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\item |
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Constrain all bonds to be of fixed length. |
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|
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\begin{itemize} |
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\item bond vibrations are the fastest motion in |
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a simulation |
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\end{itemize} |
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|
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\item |
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Allows time steps of up to 3 fs with the current integrator. In |
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contrast, a time step of 1 fs is usually required for resolving bond |
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vibration. |
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|
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\end{itemize} |
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\end{slide} |
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|
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% Slide 8 |
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|
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\begin{slide}{Soft Sticky Dipole Model\footcite{Liu96}} |
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|
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\begin{figure} |
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\begin{center} |
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\includegraphics[width=40mm]{ssd.epsi} |
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\end{center} |
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\end{figure} |
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|
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|
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It's potential is as follows: |
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|
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\begin{equation} |
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V_{s\!s\!d} = V_{L\!J}(r_{i\!j}) + V_{d\!p}(r_{i\!j},\Omega_{i},\Omega_{j}) |
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+ V_{s\!p}(r_{i\!j},\Omega_{i},\Omega_{j}) |
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\end{equation} |
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\end{slide} |
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|
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|
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% Slide 9 |
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\begin{slide}{Hydrogen Bonding in SSD} |
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|
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The SSD model's $V_{s\!p}(r_{i\!j},\Omega_{i},\Omega_{j})$ recreates |
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the hydrogen bonding network of water. |
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|
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|
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\begin{figure} |
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\begin{center} |
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\mbox{% |
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\subfigure[SSD relaxed on a diamond lattice]{% |
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\mbox{\includegraphics[angle=-90,width=55mm]{ssd_ice.epsi}}}% |
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\hspace{4mm} |
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\subfigure[Stockmayer spheres relaxed on a diamond lattice]{% |
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\mbox{\includegraphics[angle=-90,width=55mm]{dipole_ice.epsi}}}% |
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} |
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|
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\end{center} |
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\end{figure} |
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|
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\end{slide} |
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|
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|
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% Slide 10 |
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|
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\begin{slide}{The Lipid Model} |
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|
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To eliminate the need for charge-charge interactions, our lipid model |
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replaces the phospholipid head group with a single large head group |
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atom containing a freely oriented dipole. The tail is a simple alkane chain. |
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|
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Lipid Properties: |
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\begin{itemize} |
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\item $|\vec{\mu}_{\text{HEAD}}| = 20.6\ \text{D}$ |
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\item $m_{\text{HEAD}} = 196\ \text{amu}$ |
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\item Tail atoms are unified CH, $\text{CH}_2$, and $\text{CH}_3$ atoms |
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\begin{itemize} |
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\item Alkane forcefield parameters taken from TraPPE |
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\end{itemize} |
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\end{itemize} |
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|
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\end{slide} |
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|
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|
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% Slide 11 |
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|
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\begin{slide}{Lipid Model} |
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|
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|
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\end{slide} |
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|
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% Slide 12 |
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|
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\begin{slide}{Initial Runs: 25 Lipids in water} |
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|
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\begin{wrapfigure}{r}{60mm} |
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|
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\includegraphics[width=55mm]{5x5-initial.eps} |
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|
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\end{wrapfigure} |
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|
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\textbf{Simulation Parameters:} |
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|
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\begin{itemize} |
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|
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\item $N_{\mbox{lipids}} = 25$ |
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|
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\item $N_{\mbox{H}_{2}\mbox{O}} = 1386$ |
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|
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\item Water to lipid ratio of 55.4:1 |
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|
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\item Lipid had only a single saturated chain of 16 carbons |
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|
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\item Box Size: 34.5~$\mbox{\AA}$~x~39.4~$\mbox{\AA}$~x~39.4~$\mbox{\AA}$ |
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|
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\item T = 300 K |
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|
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\item NVE ensemble |
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|
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\item Periodic boundary conditions |
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\end{itemize} |
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|
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\end{slide} |
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|
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\begin{slide}{5x5: Final} |
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|
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|
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\begin{figure} |
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\begin{center} |
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\includegraphics[width=80mm]{5x5-1.7ns.eps} |
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\end{center} |
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\end{figure} |
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|
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\begin{center} |
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The final configuration at 1.7 ns. |
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\end{center} |
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|
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\end{slide} |
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|
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|
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% Slide 14 |
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|
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\begin{slide}{5x5: $g(r)$} |
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|
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\begin{figure} |
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\includegraphics[width=60mm,angle=-90]{all5x5-HEAD-HEAD-gr.eps} |
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\end{figure} |
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|
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|
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|
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\end{slide} |
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|
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\begin{slide}{5x5: $g(r)$} |
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|
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|
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\begin{figure} |
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\includegraphics[width=60mm,angle=-90]{all5x5-HEAD-X-gr.eps} |
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\end{figure} |
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|
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\end{slide} |
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|
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|
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% Slide 15 |
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|
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\begin{slide}{5x5: $\cos$ correlations} |
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|
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\begin{figure} |
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\includegraphics[width=60mm,angle=-90]{all5x5-HEAD-HEAD-cr.eps} |
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\end{figure} |
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|
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\end{slide} |
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|
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\begin{slide}{5x5: $\cos$ correlations} |
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|
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\begin{figure} |
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\includegraphics[width=60mm,angle=-90]{all5x5-HEAD-X-cr.eps} |
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\end{figure} |
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|
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\end{slide} |
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|
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|
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% Slide 16 |
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|
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\begin{slide}{Initial Runs: 50 Lipids randomly arranged in water} |
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|
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\textbf{Simulation Parameters:} |
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|
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\begin{itemize} |
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|
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\item Starting Configuration: |
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\begin{itemize} |
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\item 50 lipid molecules arranged randomly in a rectangular box |
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\item The box was then filled with 1384 waters |
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\begin{itemize} |
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\item final water to lipid ratio was 27:1 |
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\end{itemize} |
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\end{itemize} |
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|
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\item Lipid had only a single saturated chain of 16 carbons |
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|
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\item Box Size: 26.6 $\mbox{\AA}$ x 26.6 $\mbox{\AA}$ x 108.4 $\mbox{\AA}$ |
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|
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\item dt = 2.0 - 3.0 fs |
| 557 |
|
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\item T = 300 K |
| 559 |
|
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\item NVE ensemble |
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|
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\item Periodic boundary conditions |
| 563 |
|
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\end{itemize} |
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|
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\end{slide} |
| 567 |
|
| 568 |
|
| 569 |
% Slide 17 |
| 570 |
|
| 571 |
\begin{slide}{R-50: Initial} |
| 572 |
|
| 573 |
|
| 574 |
\begin{figure} |
| 575 |
\begin{center} |
| 576 |
\includegraphics[width=100mm]{r50-initial.eps} |
| 577 |
\end{center} |
| 578 |
\end{figure} |
| 579 |
|
| 580 |
|
| 581 |
The initial configuration |
| 582 |
|
| 583 |
\end{slide} |
| 584 |
|
| 585 |
\begin{slide}{R-50: Final} |
| 586 |
|
| 587 |
\begin{center} |
| 588 |
\begin{figure} |
| 589 |
\includegraphics[width=100mm]{r50-521ps.eps} |
| 590 |
\end{figure} |
| 591 |
\end{center} |
| 592 |
|
| 593 |
The fianl configuration at 521 ps |
| 594 |
|
| 595 |
\end{slide} |
| 596 |
|
| 597 |
|
| 598 |
% Slide 18 |
| 599 |
|
| 600 |
\begin{slide}{R-50: $g(r)$} |
| 601 |
|
| 602 |
|
| 603 |
\begin{figure} |
| 604 |
\includegraphics[width=60mm,angle=-90]{r50-HEAD-HEAD-gr.eps} |
| 605 |
\end{figure} |
| 606 |
|
| 607 |
\end{slide} |
| 608 |
|
| 609 |
|
| 610 |
\begin{slide}{R-50: $g(r)$} |
| 611 |
|
| 612 |
|
| 613 |
\begin{figure} |
| 614 |
\includegraphics[width=60mm,angle=-90]{r50-HEAD-X-gr.eps} |
| 615 |
\end{figure} |
| 616 |
|
| 617 |
\end{slide} |
| 618 |
|
| 619 |
|
| 620 |
% Slide 19 |
| 621 |
|
| 622 |
\begin{slide}{R-50: $\cos$ correlations} |
| 623 |
|
| 624 |
|
| 625 |
\begin{figure} |
| 626 |
\includegraphics[width=60mm,angle=-90]{r50-HEAD-HEAD-cr.eps} |
| 627 |
\end{figure} |
| 628 |
|
| 629 |
\end{slide} |
| 630 |
|
| 631 |
\begin{slide}{R-50: $\cos$ correlations} |
| 632 |
|
| 633 |
\begin{figure} |
| 634 |
\includegraphics[width=60mm,angle=-90]{r50-HEAD-X-cr.eps} |
| 635 |
\end{figure} |
| 636 |
|
| 637 |
\end{slide} |
| 638 |
|
| 639 |
|
| 640 |
% Slide 20 |
| 641 |
|
| 642 |
\begin{slide}{Future Directions} |
| 643 |
|
| 644 |
\begin{itemize} |
| 645 |
|
| 646 |
\item |
| 647 |
Simulation of a lipid with 2 chains, or perhaps expand the current |
| 648 |
unified chain atoms to take up greater steric bulk. |
| 649 |
|
| 650 |
\item |
| 651 |
Incorporate constant pressure and constant temperature into the ensemble. |
| 652 |
|
| 653 |
\item |
| 654 |
Parrellize the code. |
| 655 |
|
| 656 |
\end{itemize} |
| 657 |
\end{slide} |
| 658 |
|
| 659 |
|
| 660 |
% Slide 21 |
| 661 |
|
| 662 |
\begin{slide}{Acknowledgements} |
| 663 |
|
| 664 |
\begin{itemize} |
| 665 |
|
| 666 |
\item Dr. J. Daniel Gezelter |
| 667 |
\item Christopher Fennel |
| 668 |
\item Charles Vardeman |
| 669 |
\item Teng Lin |
| 670 |
\item Megan Sprauge |
| 671 |
\item Patrick Conforti |
| 672 |
\item Dan Combest |
| 673 |
|
| 674 |
\end{itemize} |
| 675 |
|
| 676 |
Funding by: |
| 677 |
\begin{itemize} |
| 678 |
\item Dreyfus New Faculty Award |
| 679 |
\end{itemize} |
| 680 |
|
| 681 |
\end{slide} |
| 682 |
|
| 683 |
|
| 684 |
|
| 685 |
|
| 686 |
|
| 687 |
|
| 688 |
|
| 689 |
|
| 690 |
%%%%%%%%%%%%%%%%%%%%%%%%%% END %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 691 |
|
| 692 |
\end{document} |
