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Rocky Mountains Conference
EPR Workshop: DEER Analysis programs
testing
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Sen I., Logan, T. and Fajer P., Biochemistry, 2007;46:11639-49.
http://fajerpc.magnet.fsu.edu/Programs/DEFit/defit.html
DEFit (for CW spectra:
CwdipFit)
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• All spectra were provided by the anonymous symposium participants and analyzed blindly using DEFit (till today we don’t know what the spectra are)
• The spectrum naming (slide titles) follow the key provided by the panel moderator, Dr. Eric Hustedt.
• Hardware: Intel Duo Core2, Matlab 2007b
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2a
•components A and B very well defined:narrow distributionsassymetric population
•component (c) badly defined component
C
A,B
3 Gaussians
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2b
Noisy data => large error surfaceaverage distance better defined than the distribution
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data0001
Excellent definition of three populations … complex assymetricpopulation
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data0002
one population, very well defined
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data0003
•components A and B very well defined:narrow distributionsassymetric population
•component (c) badly defined component
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last0001
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last0002
Spikes are not always spikes! two components one very narrow
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last0003
two components one very narrow
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last0004
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DATA1
low modulation depth, very long distance and very broad
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DATA2
three components, chi2 impovement 6x from 2 components.one extremely sharp