A Statistical Analysis of Deoxyribonucleic Acid Distribution in Density Gradient Centrifugation

t Porphyrins are endowed, in general, with a very great resonance energy which is responsible for the relative stability of these molecules.Thus, the resonance energy of the protoporphyrine IV is 10,570 ,3, which, with the usual value adopted for i3 in this type of calculation, namely B = 20 kcal/mole, represents about 210 kcal/mole.Although the rupture of the cyclic macro-ring represents a loss of a part of the resonance energy, this energy is still appreciable in the bile pig- ments: e.g., the resonance energy of biliverdin is 9,851 ,3 which is nearly 200 kcal/mole.l For more details about these transformations see, e.g.,