On 1 November 2016 at 22:12, Mahdi, Sam <sam.mahdi.846@xxxxxxxxxxx> wrote:
Hello everyone, I had a quick question regarding running the single model free run (m4). For some proteins we only have data at only one field strength, so I know I can't use the d'Auvergene protocol (needs a minimum of 4), so I was thinking I could run the all models free model. The problem is, I know models m6-m9 are models for another field strength, but since I don't have data at another field strength, could I just remove them? Or will relax just not run m6-9 since I've only loaded one field strength?
Hi Sam, The protocol I designed for iteratively optimising and fine tuning the coupled diffusion tensor + model-free optimisation and model selection problem will only work with 2 or more fields. If you would like to understand this problem, please read: d'Auvergne E. J., Gooley P. R. (2007). Set theory formulation of the model-free problem and the diffusion seeded model-free paradigm. Mol. Biosyst., 3(7), 483-494. (http://dx.doi.org/10.1039/b702202f)
From this, hopefully you will understand why the NMR field will not
take any results from a single field strength analysis seriously. Note that this has been the case since the mid 1990's. Regards, Edward