Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 43 for “"Density maps"”.
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Segmentation and registration of molecular components in 3-dimensional density maps from cryo-electron microscopy
… microscopy is a method that produces 3D density maps of macromolecular complexes. Segmentation and registration methods are heavily used to extract structural information from such density maps. Segmentation aims to identify regions in a density map corresponding to individual molecular …
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On the Role of Solvation in Ligand Binding: Structural and Thermodynamic Studies
… on structural data. Finally, we developed a density-based solvation method that deduces solvent energetics directly from crystallographic electron density maps. To illustrate its feasibility, the method was applied to idealized electron density maps that were calculated from Molecular …
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A Graph-Based Algorithm to Determine Protein Structure from Cryo-EM Data
Cryo-electron microscopy: cryo-EM) provides 3D density maps of proteins, but these maps do not have sufficiently high resolution to directly yield atomic-scale models. Previous work has shown that features known as secondary structures can be located in these density maps. A second source of …
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Deep Learning for Segmentation Of 3D Cryo-EM Images
… structures is still challenging when cryo-EM density maps are at medium resolutions (5-10 Å). Most existing methods are image processing methods that do not fully utilize available images in the cryo-EM database. In this paper, we present a deep learning approach to segment secondary structure …
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Computational Development for Secondary Structure Detection From Three-Dimensional Images of Cryo-Electron Microscopy
… Å) of amino acids from three-dimensional (3D) density images, secondary structure elements (SSEs) such as alpha-helices and beta-sheets can still be detected. The accuracy of SSE detection from the volumetric protein density images is critical for <em>ab initio</em> backbone structure …
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Protein Loop Length Estimation From Medium Resolution Cryoem Images
… selecting the appropriate segmentation from the density map using Hausdorff distances. Complementarily, we developed a motion planning approach to estimate the minimum length of a loop lying completely within a contour of the density map. To test the methods, loops between 1 and 10 residues in …
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Mazique (22AD502): Late Woodland Village or Vacant Ceremonial Center?
… question I explored in my thesis using artifact density maps, excavations, and ceramic and lithic analysis. Artifact density maps show that the range of activities at Mazique, with both ceramics and lithics, was not restricted to one area. Through excavation, we know that the deposition of these …
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Advances In Computer Aided Protein Structure Determination From Sparse Cryo Electron Microscopy Data
… algorithms it can frequently deliver electron density maps in the range of 3-5Å resolution. To obtain as much atomic level detail of the structure as possible from this data an accurate atomic model must be built. This can be done manually however, it is laborious and error prone. To resolve …
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A New Orleans State of Crime: Spatio-Temporal Analysis of Shifting Homicide Patterns In Post-Hurricane Katrina New Orleans, LA
… of hotspot detection included point maps, choropleth graduated color maps, and quartic kernel density maps. The project's goal was to not only detect hotspots, but to create a synoptic view of shifting homicide trends throughout the city of New Orleans, highlighting the impact of …
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Occlusion prediction for kiwifruit yield estimation
… all individual detected fruit in 3D, fruit density maps and canopy density maps. The ability of the system to predict yield with high accuracy and at orchard scale sets it apart from previous work. It is also the largest scale study currently known, consisting of over 15 million fruit.
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Grid integration of distributed renewable energy sources: a network planning perspective
… costing the engineering integration. Solar density maps provide an indication of proposed MW output in a particular area. In this research, solar density maps are used to identify the maximum connecting generation to the electrical grid in feasible geographic areas. The results derived from …
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Crystallographic refinement of thermal parameters using normal modes
… the R values as well as provided better electron density maps for making adjustments to the atomic coordinates and inserting missing atoms. These two examples show that the new normal-mode-based refinement is an effective way for describing anisotropic thermal motions in X-ray structures and is …
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A Geometric Approach for Deciphering Protein Structure from Cryo-EM Volumes
… aspects of protein modeling using cryo-EM density maps. Specifically, we develop novel methods to capture the shape of density volumes as geometric skeletons. We then use these skeletons to find secondary structure elements: SSEs) of a given protein, to identify the correspondence between …
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Performance Analysis of a Binary-Tree-Based Algorithm for Computing Spatial Distance Histograms
… used is using a conceptual data structure called density map which is implemented via a quad tree index. An algorithm having density maps implemented via binary tree is proposed in this thesis. After carrying out many experiments and analysis of the data, we figure out that although the binary …
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Breast and Cervical Cancer Screening in Virginia: The Impact of Insurance Coverage and the Every Woman's Life Screening Program
… of Health was obtained to create screening density maps with Geographic Information Systems.Results: After adjustment, women with insurance were significantly more likely to have a mammogram within the last two years compared to those without insurance (78% vs. 50%, pConclusion: The results …
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Component Trees For The Exploration Of Macromolecular Structures In Biology
… for visual exploration of component trees of the density maps of macromolecular complexes, with the purpose of improved understanding of their structure. The interactive exploration of component trees together with a robust simplification methodology provide new insights in the study of …
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Bond length and bonded radii variations in sulfide molecules and crystals containing main group elements
… lengths. Bonded radii obtained from electron density maps calculated for the molecules show that the radii of both the X-cations and S atom increase with R<sub>t</sub>(XS). A similar trend has been found to hold for the bonded radii and the R<sub>t</sub>(XO) bond lengths calculated for …
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Ecotourism and its ecological impact: A study of tourist developments in the Mara
… count data spanning a twenty year period, kernel density maps were constructed to demonstrate spatial changes in ungulate density and distribution patterns in relation to tourism growth. The resulting density maps revealed that while the national reserve offered a measure of security to wildlife, …
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Analysis of factors related to pedestrian high-crash locations
… (GIS) software program was used to develop crash density maps to help select high risk intersection locations and non intersection locations. Descriptive analysis technique (e.g., frequencies, rates, and proportions) are then applied to identify to screen the variables that are most likely related …
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Estimates of global sources and sinks of carbon from land cover and land use changes
… data (SAGE) while the other uses population density maps (HYDE), which allows this study to investigate how global LCLUC data construction can affect model estimated emissions. The timeline chosen for this study starts before the Industrial Revolution in 1765 to the year 2000 because of the …
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