New methods in sedimentation analysis using the analytical ultracentrifuge

A general procedure was laid down for estimating precise molecular weights by ultracentrifugation equilibrium using schlieren optical system. The phase plate diaphragm was checked against the knife edge of the schlieren optical system, and it was observed that the results using both the diaphragms a...

Full description

Bibliographic Details
Main Author: Khan, Ch. Ghulam Mustafa
Published: University of Leicester 1971
Subjects:
572
Online Access:https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.737181
id ndltd-bl.uk-oai-ethos.bl.uk-737181
record_format oai_dc
spelling ndltd-bl.uk-oai-ethos.bl.uk-7371812019-03-05T15:47:05ZNew methods in sedimentation analysis using the analytical ultracentrifugeKhan, Ch. Ghulam Mustafa1971A general procedure was laid down for estimating precise molecular weights by ultracentrifugation equilibrium using schlieren optical system. The phase plate diaphragm was checked against the knife edge of the schlieren optical system, and it was observed that the results using both the diaphragms are quite similar. The temperature indicating and control system of the MSE ultracentrifuge was also checked by running sedimentation velocity experiments at a wide range of temperatures, and it was found that the results of such experiments on s20,w are consistent, and are independent of temperature to the range studied. When similar experiments were performed on the Beckman Model E, the results were temperaure dependent. The new methods (Rowe and Rowe Method II and III) yielded excellent results. The method II provides satisfactory results for ideal systems using presmoothed data of concentration or concentration gradient as a function of distance from the axis of rotation. The method III provides acceptable results of Mo from data of a single sedimentation equilibrium experiment for both ideal and non-ideal systems. For both the methods to work it is essential to smooth the data with the help of fourier series, which is devised by incorporating it in the programs used by the digital computer. Procedures were also developed to determine Mo values by using hand smoothed data (instead of fourier smoothed data) with the desk computer. these procedures have made it possible to get comparable results of MO from a single photograph taken at equilibrium with any optical system without the cost of digital computer. Finally it is concluded that the new methods can be used for the estimation of precise values of molecular weights from a data of single experiment obtained by using any optical system.572University of Leicesterhttps://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.737181http://hdl.handle.net/2381/35267Electronic Thesis or Dissertation
collection NDLTD
sources NDLTD
topic 572
spellingShingle 572
Khan, Ch. Ghulam Mustafa
New methods in sedimentation analysis using the analytical ultracentrifuge
description A general procedure was laid down for estimating precise molecular weights by ultracentrifugation equilibrium using schlieren optical system. The phase plate diaphragm was checked against the knife edge of the schlieren optical system, and it was observed that the results using both the diaphragms are quite similar. The temperature indicating and control system of the MSE ultracentrifuge was also checked by running sedimentation velocity experiments at a wide range of temperatures, and it was found that the results of such experiments on s20,w are consistent, and are independent of temperature to the range studied. When similar experiments were performed on the Beckman Model E, the results were temperaure dependent. The new methods (Rowe and Rowe Method II and III) yielded excellent results. The method II provides satisfactory results for ideal systems using presmoothed data of concentration or concentration gradient as a function of distance from the axis of rotation. The method III provides acceptable results of Mo from data of a single sedimentation equilibrium experiment for both ideal and non-ideal systems. For both the methods to work it is essential to smooth the data with the help of fourier series, which is devised by incorporating it in the programs used by the digital computer. Procedures were also developed to determine Mo values by using hand smoothed data (instead of fourier smoothed data) with the desk computer. these procedures have made it possible to get comparable results of MO from a single photograph taken at equilibrium with any optical system without the cost of digital computer. Finally it is concluded that the new methods can be used for the estimation of precise values of molecular weights from a data of single experiment obtained by using any optical system.
author Khan, Ch. Ghulam Mustafa
author_facet Khan, Ch. Ghulam Mustafa
author_sort Khan, Ch. Ghulam Mustafa
title New methods in sedimentation analysis using the analytical ultracentrifuge
title_short New methods in sedimentation analysis using the analytical ultracentrifuge
title_full New methods in sedimentation analysis using the analytical ultracentrifuge
title_fullStr New methods in sedimentation analysis using the analytical ultracentrifuge
title_full_unstemmed New methods in sedimentation analysis using the analytical ultracentrifuge
title_sort new methods in sedimentation analysis using the analytical ultracentrifuge
publisher University of Leicester
publishDate 1971
url https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.737181
work_keys_str_mv AT khanchghulammustafa newmethodsinsedimentationanalysisusingtheanalyticalultracentrifuge
_version_ 1718997061051875328