*** For details on how to be removed from this list visit the ***
*** CCP4 home page http://www.ccp4.ac.uk ***
I'm wondering if there is a program in CCP4 that can calculate electron
density maps on absolute scale. That is, take the value for F000 estimated
by TRUNCATE, insert it into the data file, estimate the phase and calculate
the maps. I found an option in FFT for scaling the map using F000, but as
far as I can tell FFT does not use F000 in the actual electron density
calculation.
F000 is the total nr of electrons in the unit cell. dividing its value by the
volume of the unit cell gives you the average electron density level (which is
zero if you leave out F000), which you can simply add to your map yourself,
e.g., with the PLus command in mapman
(http://xray.bmc.uu.se/usf/mapman_man.html#S23)
--dvd
******************************************************************
Gerard J. Kleywegt
[Research Fellow of the Royal Swedish Academy of Sciences]
Dept. of Cell & Molecular Biology University of Uppsala
Biomedical Centre Box 596
SE-751 24 Uppsala SWEDEN
http://xray.bmc.uu.se/gerard/ mailto:[EMAIL PROTECTED]
******************************************************************
The opinions in this message are fictional. Any similarity
to actual opinions, living or dead, is purely coincidental.
******************************************************************
