(CA2) comprises scientific applications of CA to the modeling of specific problems to mention just a few: urban evolution (Batty 2005), Ising models (Creutz 1986), neural networks (Franceschetti, Campbell, Hamneken 1992 pp. 124 128), and even turbulence phenomena (Chen, Chen, Doolen, Lee, 1983).
Both independent (SiO4 4- and double (Si2O7 6- groups are incorporated into the epidote structure, as is reflected in its formula: Ca2(Al, Fe Al2O(SiOH)(Si2OH)(OH).
The membrane of the presynaptic terminal contains voltage-dependent calcium channels that open when the membrane is depolarized by a nerve impulse, allowing Ca2+ to diffuse into the terminal along its concentration gradient.
Contraction is initiated by the release of calcium ions (Ca2+) upon the depolarization of the membrane, which is induced by nerve impulses.
The removal of calcium ions (Ca2+) from the sarcoplasm is accomplished by a protein that catalyzes the breakdown of ATP, making the free energy of hydrolysis available for the energy-requiring process of Ca2+ transport.
When activated, neurons and muscle cells rapidly increase their cytoplasmic Ca2+ concentration by opening channels in the cell membrane, which allow Ca2+ ions outside the cell to enter rapidly.
One of the subunits (TnC) is the receptor for Ca2+ released from the sarcoplasmic reticulum on activation of the muscle.
A prominent sensor material is zirconia, which, as noted above, can be an excellent high-temperature oxygen conductor if suitably doped with Ca2+ or Y3+.
Though it is not biologically active itself, cholecalciferol is converted by the liver and the kidneys into several forms of vitamin D with various metabolic roles, including regulating calcium (Ca2+) levels in the intestine, kidney, liver, and bone and controlling differentiation of hematopoetic cells in bone marrow to macrophages and osteoclasts for bone formation.
Each of the phases of the action potential is caused by time-dependent changes in the permeability of the plasma membrane to potassium ions (K+), sodium ions (Na+), and calcium ions (Ca2+).
Phases 1, 2, and 3 result from changes in membrane permeability and conductance to Na+, K+, and Ca2+.
