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Mineralogy and Crystalography Software
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This website describes the animations and software Crystal Movies, XtalDraw, and XPow. ...

This website describes the animations and software Crystal Movies, XtalDraw, and XPow. Crystal Movies are gif animations that illustrate the evolution of crystal structures as functions of pressure, temperature, chemistry, or orientation. XtalDraw is an interactive Windows-based software that draws ball and stick, polyhedral, and thermal ellipsoid representations of crystal and molecular structures. XPow plots theoretical diffraction patterns of crystalline materials.

Material Type:
Reading
Provider:
NAGT Cutting Edge (SERC)
University of Arizona
The Nernst/Goldman Equation Simulator
Conditions of Use:
No Strings Attached
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It would be difficult to exaggerate the physiological significance of the transmembrane ...

It would be difficult to exaggerate the physiological significance of the transmembrane electrical potential difference, or ‘PD.’ This gradient of electrical energy that exists across the plasma membrane of every cell in the body influences nutrient transport into and out of cells, is a key driving force in the movement of salt (and therefore water) across cell membranes and between organ-based compartments, is an essential element in the signaling processes associated with coordinated movements of cells and organisms, and is ultimately the basis of all cognitive processes. The Nernst equation (named after its originator, the German Chemist and Nobel laureate, Walther Nernst), provides a quantitative measure of the equality that exists between chemical and electrical gradients and is the starting point for understanding the basis of the “membrane potential.” The Goldman-Hodgkin-Katz equation (named in honor of American David Goldman and the British Nobel laureates Sir Alan Hodgkin and Sir Bernard Katz; frequently simply referred to as “the Goldman equation”) calculates an estimated membrane potential that reflects the relative contributions of the chemical concentration gradients and relative membrane permeability for K+, Na+ and Cl-.

Subject:
Anatomy/Physiology
Biology
Material Type:
Interactive
Simulation
Provider:
University of Arizona
Provider Set:
Individual Authors
Author:
Designed and programmed by Michael Branch under the direction of Dr. Stephen Wright.