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Valence shell electron pair repulsion (VSEPR) theory (/ ˈ v ɛ s p ər, v ə ˈ s ɛ p ər / VESP-ər, [1]: 410 və-SEP-ər [2]) is a model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms. [3]
predict both 3-state and 8-state secondary structure using conditional neural fields from PSI-BLAST profiles: Webserver/downloadable: server download: 2011 GOR: Information theory/Bayesian inference: Many implementations: Basic GOR GOR V: 2002 (GOR V) Jpred: Multiple Neural network assignment from PSI-BLAST and HMMER profiles. Predicts ...
Quantum chemistry computer programs are used in computational chemistry to implement the methods of quantum chemistry.Most include the Hartree–Fock (HF) and some post-Hartree–Fock methods.
In chemistry, a trigonal pyramid is a molecular geometry with one atom at the apex and three atoms at the corners of a trigonal base, resembling a tetrahedron (not to be confused with the tetrahedral geometry).
Constituent amino-acids can be analyzed to predict secondary, tertiary and quaternary protein structure. This list of protein structure prediction software summarizes notable used software tools in protein structure prediction, including homology modeling, protein threading, ab initio methods, secondary structure prediction, and transmembrane helix and signal peptide prediction.
NEMO 3-D [10] – enables multi-million atom electronic structure simulations in empirical tight binding; open source; an educational version is on nanoHUB and Quantum Dot Lab [11] nextnano [12] allows simulating geometry, electronic properties and electrical transport phenomena in various nanostructures using continuum models (commercial software)
Mercury is a freeware developed by the Cambridge Crystallographic Data Centre, originally designed as a crystal structure visualization tool. Mercury helps three dimensional visualization of crystal structure and assists in drawing and analysis of crystal packing and intermolecular interactions. [1]
Structure [ edit ] The iodine atom of iodine trifluoride has five electron pairs, of which two are lone-pairs, and the molecule is T-shaped as predicted by VSEPR Theory .