The Challenge of Web-Based Molecular Visualization Robert M. Hanson St. Olaf College Cologne University August 21, 2006.

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Presentation transcript:

The Challenge of Web-Based Molecular Visualization Robert M. Hanson St. Olaf College Cologne University August 21, 2006

This talk is about visualization – but not just any kind. It is about my favorite kind of visualization – molecular visualization. But first, let’s think about visualization in general…. Why visualize?

Graphical visualization 0, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,12.52 What are we looking at?

Graphical visualization A titration curve.

Graphical visualization time(sec) [NO2] What have we here?

Graphical visualization Ah, yes, but what kind of reaction kinetics?

Graphical visualization Not first order…

Graphical visualization Second order, it is!

Medical visualization

Körperwelten

Molecular visualization Friedrich August Kekulé concludes that the structure of benzene is a closed, hexagonal, six-membered ring after a visionary dream. "...I was sitting writing on my textbook, but the work did not progress; my thoughts were elsewhere. I turned my chair to the fire and dozed. Again the atoms were gamboling before my eyes. This time the smaller groups kept modestly in the background. My mental eye, rendered more acute by the repeated visions of the kind, could now distinguish larger structures of manifold conformation; long rows sometimes more closely fitted together all twining and twisting in snake-like motion. But look! What was that? One of the snakes had seized hold of its own tail, and the form whirled mockingly before my eyes. As if by a flash of lightning I awoke; and this time also I spent the rest of the night in working out the consequences of the hypothesis." Royston M. Roberts, Serendipidty, Accidental Discoveries in Science, John Wiley and Sons, New York, NY,1989, pp

Molecular visualization

Bob, turn on the sound now.

Molecular visualization

Molecular visualization quartz helix

Molecular visualization marcasite

Molecular visualization zircon

Web-base molecular visualization Challenges include: Realistic rendering Speed Scalability Surface rendering

Web-base molecular visualization Applications of isosurfaces: molecular/solvent surfaces

Web-base molecular visualization Applications of isosurfaces: molecular orbitals

Web-base molecular visualization Applications of isosurfaces: electrostatic potentials

Web-base molecular visualization Applications of isosurfaces: atomic orbitals

Web-base molecular visualization Applications of isosurfaces: LCAO “cartoons”

Web-base molecular visualization Applications of isosurfaces: ellipsoids and user-defined functions

Web-base molecular visualization Isosurface Implementation in Jmol: Adapted Marching Cubes algorithm

Web-base molecular visualization Isosurface Implementation in Jmol: Adapted Marching Cubes algorithm Marching Squares algorithm

Web-base molecular visualization Isosurface Implementation in Jmol: Adapted Marching Cubes algorithm Marching Squares algorithm Dynamic cube generation

Web-base molecular visualization Isosurface Implementation in Jmol: Adapted Marching Cubes algorithm Marching Squares algorithm Dynamic cube generation Read/Write JVXL file format

file:///C:/jmol-dev/workspace/Jmol-bob200603/script_documentation/examples-11/data/ethene.jvxl

Web-base molecular visualization Typical JVXL compression statistics: compoundtypeCube size/KbJVXL size/KbCompression ratio CH3ClElectron density CH3ClElectrostatic Potential CH3ClESP-mapped electron density etheneMO crnSolvent surface???3.4???

Acknowledgments Miguel Howard wrote the original isosurface code using the Marching Cube algorithm. I used that as a basis to adapt the Marching Squares algorithm, which was kindly suggested to me by Olaf Hall-Holt. Fast gaussian molecular orbital calculations are based on algorithms by Daniel Severance and Bill Jorgensen. I thank Won Kyu Park for pointing me to this work.Marching CubeMarching SquaresOlaf Hall-HoltDaniel Severance and Bill JorgensenWon Kyu Park Many thanks to Chris Steinbeck, Egon Willighagen, and Hens Borkent for the kind invitations to speak to you today.