From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of
> Zbyszek Otwinowski
> Sent: Wednesday, July 06, 2011 1:19 PM
> To: CCP4BB@JISCMAIL.AC.UK
> Subject: Re: [ccp4bb] How to evaluate Fourier transform ripples
>
> The question about Fourier transformation ripples h
Dear All, Thank you so much for the help and suggestions on the issue
of Fourier Transform Ripples. They are really helpful.
Best,ConanUniversity of California, Riverside
org/wiki/Gibbs_phenomenon
> >
> > With best regards,
> >
> > Thierry
> >
> > Note: sent a 2nd time as it seems that it did not reach the BB the
> > first
> > time. Apologies if the message reaches you twice.
> >
> > -Origin
cularly at different resolution cut offs.
> -Original Message-
> From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of
> Fischmann, Thierry
> Sent: 06 July 2011 18:59
> To: CCP4BB@JISCMAIL.AC.UK
> Subject: Re: [ccp4bb] How to evaluate Fourier transform r
Hi Conan,
> Specifically, the reviewers question whether ripples may affect on the
> electron density around heavy metal center which has a Mo-S-As
> connection. From which angle or in which way this problem should be
> addressed most convincingly ?
The maximum entropy estimate of the map shou
011 1:19 PM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] How to evaluate Fourier transform ripples
The question about Fourier transformation ripples has a straightforward
answer in a fairly typical situation:
A) data are collected to the resolution limit of diffraction,
B) phases are unifo
The question about Fourier transformation ripples has a straightforward
answer in a fairly typical situation:
A) data are collected to the resolution limit of diffraction,
B) phases are uniform in quality across the resolution range, which is
equivalent to R-free being uniform with respect to resol
I would be very careful about any bond to As. I would imagine such
bonds would be very susceptible to radiolysis with typical radiation used
in the diffraction data collection. Have you performed some
diffraction experiments of various time lengths (or flux) and seen what
happens around this
I note that all three of those atoms should have anomalous scattering
and should show up as peaks in anomalous Fourier maps if you collected
data carefully enough at multiple wavelengths. The As K edge is 1.04 A,
which is easily within reach of most MAD synchrotron beamlines. The Mo
peaks are out o
Dear All, Hi. I was asked in a manuscript revision to discuss about the
possible effects of Fourier transformation ripples on the crystallographic
results. Specifically, the reviewers question whether ripples may affect on the
electron density around heavy metal center which has a Mo-S-
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