Shape Difference Vectors
Shape Difference Vectors - Related Videos
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VSEPR Theory and the Basic Shapes
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Overview of VSEPR Theory Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure, including approximate bond angles around a central atom, of a molecule from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them.
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Cited by 20 •
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We describe the production strategy of integrase-deficient lentiviral vectors (IDLVs) as vehicles for delivering CRISPR/Cas9 to cells. With an ability to mediate quick and robust gene editing in cells, IDLVs present a safer and equally effective vector platform for gene delivery compared to integrase-competent vectors.
FAQs
Direction indicates the orientation of a displacement between corresponding anatomical locations, while magnitude expresses how large that displacement is. Reading these properties together helps distinguish where tissue has shifted and how strongly the change is expressed. In brain-shape analyses, this combination can expose localized cortical expansion, contraction, or deformation rather than reducing the comparison to one overall size difference.
Summary measures can condense anatomy into broad quantities, potentially obscuring regional differences. Shape difference vectors preserve location-specific information by assigning a displacement to each corresponding point, landmark, or surface vertex. This makes it possible to see whether anatomical changes are concentrated in particular cortical areas, even when two brains have similar overall measurements.
Correspondence ensures that each vector compares meaningful anatomical counterparts. Without that relationship, a direction or magnitude could reflect mismatched locations rather than an actual anatomical difference. The analysis therefore establishes correspondence among points, landmarks, or surface vertices on reference and comparison brains, allowing the resulting displacement patterns to be interpreted as localized structural changes.
A basic workflow selects a reference brain and a comparison brain, establishes correspondence between their anatomical points, landmarks, or surface vertices, and calculates the displacement at each matched location. Researchers can then examine the resulting directions and magnitudes to identify localized expansion, contraction, or deformation and compare those patterns across individuals, stages, or groups.
They are useful when researchers need to compare anatomical form across individuals, developmental stages, or clinical groups while retaining regional detail. The representations help identify localized differences that broader measurements may miss. This makes them suitable for studies examining how brain structure varies with aging, neurological disorders, or other group-level comparisons.
By showing where anatomical displacement occurs and how large it is, the vectors provide spatially specific evidence of structural change. Researchers can compare these patterns across aging groups, neurological conditions, or before-and-after treatment contexts. The resulting maps help relate regional brain morphology to the scientific question under study rather than relying only on a single summary measurement.