{"title":"An application of the Rayleigh optics of the ultracentrifuge to molecular weight determinations by the Archibald method","authors":"Joe L. Roberts, Gene F. Conway","doi":"10.1016/0926-6577(64)90166-4","DOIUrl":null,"url":null,"abstract":"<div><p>For <span>Archibald</span> molecular weight calculations measurements are made along a single Rayleigh fringe. The displacement of the fringe measured as a function of the radial distance, <em>x</em>, is used to obtain the concentration gradient d<em>c</em>/d<em>x</em> by fitting a second-degree polynomial in <em>x</em>, extrapolating and differentiation. Good agreement with published values of the molecular weight was obtained with solutions of RNAase and of bovine serum albumin.</p><p>Also described is a graphical method for obtaining d<em>c</em>/d<em>x</em> from a tangent to the fringe drawn upon a photographic enlargement.</p></div>","PeriodicalId":100169,"journal":{"name":"Biochimica et Biophysica Acta (BBA) - Specialized Section on Biophysical Subjects","volume":"88 1","pages":"Pages 201-204"},"PeriodicalIF":0.0000,"publicationDate":"1964-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0926-6577(64)90166-4","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Biochimica et Biophysica Acta (BBA) - Specialized Section on Biophysical Subjects","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0926657764901664","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
For Archibald molecular weight calculations measurements are made along a single Rayleigh fringe. The displacement of the fringe measured as a function of the radial distance, x, is used to obtain the concentration gradient dc/dx by fitting a second-degree polynomial in x, extrapolating and differentiation. Good agreement with published values of the molecular weight was obtained with solutions of RNAase and of bovine serum albumin.
Also described is a graphical method for obtaining dc/dx from a tangent to the fringe drawn upon a photographic enlargement.