Linked Life Data

2619036

Source:http://linkedlifedata.com/resource/pubmed/id/2619036

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1990-3-8
pubmed:abstractText
Using fundamental concepts of hydrodynamics in porous media, we have rederived the Lumpkin-DèJardin-Zimm (LDZ) model for the gel electrophoresis of reptating, infinitely long, worm-like chains, such as DNA. The force balance provides a constraint for evaluating the correlation among the segment-to-field angles of a given molecular conformation. We have used an approximate analytical expression to account for this correlation in order to apply the present derivation to finite chain lengths. The resulting extended LDZ model predicts a nonlinear variation of electrophoretic mobility (mu) with reciprocal chain length (1/Lc) at low electric field strengths, similar to the one observed. The present derivation is valid only at low electric field strengths, and the predictions of the extended LDZ model fit data for a dimensionless electric field strength, E1*, of less than 1.23. An empirically useful criterion for determining the onset of reptation is also described. The present treatment shows how size-exclusion effects can be included in future theories. Models based on reptation alone are shown to predict a discontinuity in the molecular chain length dependence of mobility at a critical molecular size. Such discontinuities are not observed experimentally.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0003-2697
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
183
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
122-33
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
On the theory of gel electrophoresis of DNA: extension and evaluation of the Lumpkin-DèJardin-Zimm model.
pubmed:affiliation
Department of Molecular and Cell Biology, University of Connecticut, Storrs 06269.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S.