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By means of the Brownian dynamics (BD) method of simulations we havedeveloped, we study dynamics of individual DNA undergoing constant field gelelectrophoresis (CFGE), focusing on the relevance of the `defect' concept dueto de Gennes in CFGE. The corresponding embodiment, which we call {\it slackbeads} (s-beads) is explicitly introduced in our BD model. In equilibrium undera vanishing field the distance between s-beads and their hopping range arefound to be randomly distributed following a Poisson distribution. In thestrong field range, where a chain undergoes the elongation-contraction motion,s-beads are observed to be alternatively annihilated in elongation and createdin contraction of the chain. On the other hand, the distribution of hoppingrange of s-beads does not differ much from that in equilibrium. The resultsindicate that the motion of the chain elongated consists of a huge number ofrandom movements of s-beads. We have also confirmed that these features ofs-beads agree qualitatively with those of s-monomers in the extended bondfluctuation model (EBFM) which we recently proposed. The coincidence of the twosimulations strongly supports the stochastic semi-local movement of s-monomerswhich we {\it a priori} introduced into the EBFM.Comment: 14 pages, 11 figure

Brownian dynamics studies on DNA gel electrophoresis. II. “Defect” dynamics in the elongation-contraction motion