Visualization of Energy Conversion Processes in a Light Harvesting Organelle at Atomic Detail
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1 Visualization of Energy Conversion Processes in a Light Harvesting Organelle at Atomic Detail Theoretical and Computational Biophysics Group Center for the Physics of Living Cells Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign Supercomputing 2014 New Orleans, LA, November 19, 2014
2 Nature s Use of Solar Energy Solar energy powers life on Earth 120,000 TW average solar irradiance Natural light harvesting systems use quantum mechanical phenomena to convert light into chemical energy, to be stored and consumed by cells Use insights from nature to engineer bio-hybrid or synthetic devices to help feed our >15 TW power demand Blankenship et al., Science 332(6031): , 2011.
3 Photosynthetic Chromatophore of Purple Bacteria Purple bacteria live in lightstarved conditions at the bottom of ponds, with ~1% sunlight Chromatophore system 100M atoms, 700 Å 3 volume Contains over 100 proteins, ~3,000 bacteriochlorophylls for collection of photons Energy conversion process synthesizes ATP, which fuels cells NIH BTRC for Macromolecular Modeling and Bioinformatics
4 Movie sums up ~40 papers and 37 years of work by Schulten lab and collaborators Driving NAMD and VMD software design: Two decades of simulation, analysis, and visualization of individual chromatophore components w/ NAMD+VMD
5 Chromatophore Challenges Combines structure data from many imaging modalities: AFM, cryo-em, Tomography, X-Ray Crystallography, NAMD+VMD structure building tools, file formats, analysis algorithms reworked to handle >100M-atom scales Simulation of complete chromatophore requires petascale computing on Blue Waters and Titan New algorithms for efficient use of GPUs, Cray XK7 for all stages of simulation, analysis, and visualization Study of quantum dynamics required development of completely new software (HEOM) on large shared memory parallel computers NIH BTRC for Macromolecular Modeling and Bioinformatics
6 NAMD Chromatophore Runs on Titan w/ 16,384 GPUs NIH BTRC for Macromolecular Modeling and Bioinformatics
7 Role of Visualization MD simulation, analysis, visualization provide researchers a so-called Computational Microscope Visualization is heavily used at every step of structure building, simulation prep and run, analysis, and publication 1998 VMD rendering of LH-I SGI Onyx2 InfiniteReality w/ IRIS GL
8 VMD Parallel Rendering on Blue Waters New graphical representation schemes, transparent surface shaders GPU-accelerated molecular surface calculations, memory-efficient algorithms for huge complexes VMD + GPU-accelerated Tachyon ray tracing engine based on CUDA+OptiX w/ MPI+Pthreads Each revision: 7,500 frames render on 96 Cray XK7 nodes in 290 node-hours, 45GB of images prior to editing GPU-Accelerated Molecular Visualization on Petascale Supercomputing Platforms. J. E. Stone, K. L. Vandivort, and K. Schulten. UltraVis 13, NIH BTRC for Macromolecular Modeling and Bioinformatics
9 Two lights, no shadows Lighting Comparison Two lights, hard shadows, 1 shadow ray per light Ambient occlusion + two lights, 144 AO rays/hit NIH BTRC for Macromolecular Modeling and Bioinformatics
10 Acknowledgements Theoretical and Computational Biophysics Group, University of Illinois at Urbana-Champaign NVIDIA OptiX Team Funding: NIH support: 9P41GM104601, 5R01GM NSF PRAC The Computational Microscope, OCI and ACI , and Blue Waters OCI and ACI DOE INCITE DE-AC05-00OR22725
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