VCBM 12: Eurographics Workshop on Visual Computing for Biology and Medicine

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https://diglib.eg.org/handle/10.2312/464

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Browsing VCBM 12: Eurographics Workshop on Visual Computing for Biology and Medicine by Subject "Biology and genetics"

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    Atomistic Visualization of Mesoscopic Whole-Cell Simulations
    (The Eurographics Association, 2012) Falk, Martin; Krone, Michael; Ertl, Thomas; Timo Ropinski and Anders Ynnerman and Charl Botha and Jos Roerdink
    Molecular visualizations are a principal tool for analyzing the results of biochemical simulations. With modern GPU ray casting approaches it is only possible to render several millions of atoms at interactive frame rates unless advanced acceleration methods are employed. But even simplified cell models of whole-cell simulations consist of at least several billion atoms. However, many instances of only a few different proteins occur in the intracellular environment, which is beneficial in order to fit the data into the graphics memory. One model is stored for each protein species and rendered once per instance. The proposed method exploits recent algorithmic advances for particle rendering and the repetitive nature of intracellular proteins to visualize dynamic results from mesoscopic simulations of cellular transport processes. We present two out-of-core optimizations for the interactive visualization of data sets composed of billions of atoms as well as details on the data preparation and the employed rendering techniques. Furthermore, we apply advanced shading methods to improve the image quality including methods to enhance depth and shape perception besides non-photorealistic rendering methods.
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    Visualization and Exploration of 3D Toponome Data
    (The Eurographics Association, 2012) Oeltze, Steffen; Klemm, Paul; Hillert, Reyk; Preim, Bernhard; Schubert, Walter; Timo Ropinski and Anders Ynnerman and Charl Botha and Jos Roerdink
    The toponome of a cell describes the location and topological distribution of proteins across the cell. In toponomics, the toponome is imaged and its inner structure and its semantics are investigated in order to understand how cells encode different functionalities both in health and disease. Toponome imaging results in complex multiparameter data composed of a 3D volume per protein affinity reagent. After imaging, the data is binarized such that 1 encodes protein present and 0 encodes protein absent. Biologists are particularly interested in the clustering of these binary protein patterns and in the distribution of clusters across the cell. We present a volume rendering approach for visualizing all unique protein patterns in 3D. A unique color is dynamically assigned to each pattern such that a sufficient perceptual difference between colors in the current view is guaranteed. We further present techniques for interacting with the view in an exploratory analysis. The biologist may for instance ''peel of'' clusters thereby revealing occluded cell structures. The 3D view is integrated in a multiple coordinated view system. Peeling off clusters or brushing protein patterns in the view updates all other views. We demonstrate the utility of the view with a cell sample containing lymphocytes.