Mobility and activation energy of single-stranded DNA in denaturing cross-linked polyacrylamide slab gels

An original apparatus based on laser-induced fluorescence detection is pres ented. One lane migration combined to four equidistant detection points all ows the study of the dynamics of DNA bands during electrophoresis. We focus this article on the study of the mobility of DNA sequencing fragments as a function of temperature; mobility is determined in 4% T, 5% C and 4.3% T, 5% C cross-linked polyacrylamide gels at an electric field of 45 V/cm [T=(g acrylamide+g N,N'-methylenebisacrylamide)/100 mi solution; C=g N,N'-methyl enebisacrylamide/% T]. Activation energy has been investigated under these experimental conditions with a temperature varying from 25 to 50 degrees C, The activation energy for migration through the cross-linked polyacrylamid e gel decreases with fragment length under our experimental conditions and it varies along the migration. (C) 2000 Elsevier Science B.V. All rights re served.