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Biological Small Angle ScatteringTheory and Practice$
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Eaton E. Lattman, Thomas D. Grant, and Edward H. Snell

Print publication date: 2018

Print ISBN-13: 9780199670871

Published to Oxford Scholarship Online: September 2018

DOI: 10.1093/oso/9780199670871.001.0001

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Making the Best Use of Beamtime

Making the Best Use of Beamtime

Chapter:
(p.86) 6 Making the Best Use of Beamtime
Source:
Biological Small Angle Scattering
Author(s):

Eaton E. Lattman

Thomas D. Grant

Edward H. Snell

Publisher:
Oxford University Press
DOI:10.1093/oso/9780199670871.003.0006

Extracting information from scattering data is very sensitive to the quality of the data. In this chapter data quality characterization is described, including initial data processing procedures to alert the user to potential data quality issues. Accurate buffer subtraction is crucial for correct modeling and analysis of SAS data, and mechanisms for identifying buffer subtraction errors are discussed. Examining SAS parameters such as a function of concentration or exposure is very useful for identifying concentration dependent artifacts or radiation damage that, if unnoticed, can be very detrimental to further analysis, including misinterpreting the results and drawing erroneous conclusions. SAS is often used for analyzing flexible molecules in solution that may be difficult to study with other structural techniques. Qualitative and quantitative assessments of flexibility are described.

Keywords:   Sample to detector diatance, Calibration, Sample concentration, Exposure time, Integration, Buffer subtraction, Data quality, Radiation damage

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