paired state
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Author(s):  
John T. Eapen

Oxygen is an element indispensable for all aerobic organisms to sustain life (1). Cells produce energy mainly in the mitochondria through oxidative phosphorylation, a series of electron transfer in the Electron Transport Chain (ETC), where oxygen is the final electron acceptor. During this process, it creates free radicles by the mitochondria. Oxidative stress produces free radicals. A 70 Kgs man may produce nearly 2 Kg of free radicals in his body in a year (2). It is comparatively a huge amount. Examples offree radicals with one or more unpaired electrons are superoxide, hydroxyl, andnitric oxide radicals (1, 3). A molecule like oxygen is stable when it shares its electrons in the paired state, when it loses or gains an extra electron, it becomes unstable. This condition leads them to “steal” or take it from other biomolecules. This process leaves the biomolecules in the oxidative state, which can start pathological conditions. For example, when Low-Density Lipoproteins when becomingoxidized, causes atherosclerosis in the blood vessels and cause plaques inside the arteries (4).


2014 ◽  
Vol 90 (12) ◽  
Author(s):  
Sutirtha Mukherjee ◽  
J. K. Jain ◽  
Sudhansu S. Mandal

2008 ◽  
Vol 22 (28) ◽  
pp. 2715-2725 ◽  
Author(s):  
DANIEL C. MATTIS

This theoretical study of superconductivity examines repulsive forces that, surprisingly, favor the BCS paired state. The value of Tc and the pairing symmetry (s-, p-, d-wave) are obtained exactly as eigenvalues in a given sector of a Fredholm integral equation of the second kind.


2007 ◽  
Vol 79 (3) ◽  
pp. 30005 ◽  
Author(s):  
Junpeng Cao ◽  
Yuzhu Jiang ◽  
Yupeng Wang

1989 ◽  
Vol 03 (12) ◽  
pp. 1765-1781 ◽  
Author(s):  
P. Fazekas

We study the ground state of a Hamiltonian introduced by Kolb and Penson for modelling situations in which small electron pairs are formed. The Hamiltonian consists of a tight binding band term, and a term describing the nearest neighbour hopping of electron pairs. We give a Gutzwiller-type variational treatment, first with a single-parameter Ansatz treated in the single site Gutzwiller approximation, and then with more complicated trial wave functions, and an improved Gutzwiller approximation. The calculation yields a transition from a partially paired normal state, in which the spin susceptibility has a diminished value, into a fully paired state.


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