On the treatment of negative intensity observations

By S. French, K. Wilson. 1978

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Citations in the corpus

Towards automated crystallographic structure refinement with phenix.refine (2012, methodology): “…original input data as (a) the user can specify resolution and cutoffs, (b) phenix.refine performs outlier filtering and (c) if the input data are in the form of intensities phenix.refine will automatically convert them to amplitudes using the French and Wilson algorithm (French & Wilson, 1978).”
A New Generation of Crystallographic Validation Tools for the Protein Data Bank (2011, background): “As is the case for missed symmetries, it is of vital importance that the free set of Miller indices be invariant under the twin law.”
How good are my data and what is the resolution? (2013, methodology): “These simulated intensities were converted to amplitudes (denoted Frandom) with the CCP4 program CTRUNCATE using the same procedure as used for the experimental data (French & Wilson, 1978).”
Anomalous signal indicators in protein crystallography. (2005, background): “The latter positivity constraint is imposed to avoid the need for a Bayesian update of these intensities (French & Wilson, 1978).”
The application of multivariate statistical techniques improves single-wavelength anomalous diffraction phasing. (2004, methodology): “All data sets used were scaled using TRUNCATE (French & Wilson, 1978) from CCP4 (Collaborative Computational Project, Number 4, 1994) to obtain jF j, jFÿj, the mean jFj and Bijvoet differences.”
Global Indicators of X-ray Data Quality (2000, methodology): “Structure-factor amplitudes were calculated from the intensities using the method of French & Wilson (1978) as implemented in the program TRUNCATE (Collaborative Computational Project, Number 4, 1994).”
PDB_REDO: constructive validation, more than just looking for errors (2012, methodology): “Intensities are converted to amplitudes using CTRUNCATE, which deals with negative intensities (French & Wilson, 1978).”
The Crystal Structure of Bacillus subtilis Lipase : A Minimal α/β Hydrolase Fold Enzyme (2001, methodology): “Reduction to structure factor amplitudes was performed with TRUNCATE.(32)”
Auto-rickshaw: an automated crystal structure determination platform as an efficient tool for the validation of an X-ray diffraction experiment. (2005, background): “SCALEPACK2MTZ and TRUNCATE (French & Wilson, 1978) convert the intensities to structurefactor amplitudes and prepare the MTZ-type files.”
Intensity statistics in twinned crystals with examples from the PDB. (2006, methodology): “If observed intensities were present in a CIF file they were used directly and for other applications they were converted to structure factors using TRUNCATE (French & Wilson, 1978).”
Decision making in xia2 (2013, methodology): “While the result of this analysis is typically not unique, it is assumed that the result should be appropriate for reducing the bias in the TRUNCATE procedure.”
The structure of Dasatinib (BMS-354825) bound to activated ABL kinase domain elucidates its inhibitory activity against imatinib-resistant ABL mutants. (2006, background): “on an absolute scale with Truncate (26) from the CCP4 suite (27).”