Site-directed spin labeling for EPR or paramagnetic relaxation enhanced NMR also uses cysteine extensively.
2.
Recently, spin-labelling has also been used to probe chemical local environment in NMR itself, in a technique known as Paramagnetic Relaxation Enhancement ( PRE ).
3.
These contributions include : pure mathematics, Lie groups ( 1931 ); hyperfine structure, calculation of nuclear quadrupole moments, ( 1935 ); low temperature physics, magnetism, thermodynamics of superconductors, paramagnetic relaxation ( 1935-1942 ); applications of Onsager's theory of irreversible phenomena ( 1942-1950 ).
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