نتایج جستجو برای: molecular geometry

تعداد نتایج: 772341  

Journal: :Journal of chemical information and computer sciences 2002
Viviana Consonni Roberto Todeschini Manuela Pavan Paola Gramatica

In a previous paper the theory of the new molecular descriptors called GETAWAY (GEometry, Topology, and Atom-Weights AssemblY) was explained. These descriptors have been proposed with the aim of matching 3D-molecular geometry, atom relatedness, and chemical information. In this paper prediction ability in structure-property correlations of GETAWAY descriptors has been tested extensively by anal...

Journal: :Chemistry Education Research and Practice 2021

Visuospatial thinking is considered crucial for understanding of three-dimensional spatial concepts in STEM disciplines. Despite their importance, little known about the underlying cognitive processing required to spatially reason and varied strategies students may employ solve visuospatial problems. This study seeks identify describe how when use imagistic or analytical reasoning making pen-on...

2011
Aaron Knoll Bin Liu Kah Chun Lau Maria K.Y. Chan Aslihan Sumer Jeffrey Greeley Larry Curtiss Julius Jellinek Mark Hereld Michael E. Papka

Molecular surfaces at atomic and subatomic scales are inherently ill-defined. In many computational chemistry problems, interfaces are better represented as volumetric regions than as discrete surfaces. The geometry of this interface is largely defined by electron density and electrostatic potential fields. While experimental measurements such as chemical bond and Van der Waals radii do not dir...

Journal: :Computers & Chemical Engineering 2012
Angelo Lucia Brian M. Bonk

Differences in molecular size and shape have long been known to cause difficulties the modeling and simulation of fluid mixture behavior and generally manifest themselves as poor predictions of densities and phase equilibrium, often resulting in the need to regress model parameters to experimental data. A predictive approach to molecular geometry within the Gibbs–Helmholtz Constrained (GHC) fra...

Journal: :The Journal of pharmacology and experimental therapeutics 1997
H Ghandehari P L Smith H Ellens P Y Yeh J Kopecek

Colon-specific delivery of metabolically labile molecules, such as proteins and peptides, is of particular interest in pharmaceutical research. Among the factors that may influence the permeability of drug molecules across colonic mucosa are their molecular weight and geometry. The purpose of this study was to evaluate the influence of molecular geometry on in vitro permeability across rabbit d...

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