Re: [ccp4bb] About the A in AI

2023-05-12 Thread DUMAS Philippe (IGBMC)
Bayesian reasoning: Given the observation of the complete identity of the 2 reports, what is the likelyhood that Bing & ChatGPT arrived at the same result vs. the null hypothesis that Bernhard made a simple "cut & paste" mistake. Philippe Dumas De: "Bruno KLAHOLZ" À: "CCP4BB" Envoyé: V

Re: [ccp4bb] Can twinning be seen in the diffraction pattern?

2021-03-17 Thread DUMAS Philippe (IGBMC)
It seems to me that it is legitimate to refer to what you describe as "twinning". That's the difference between merohedral and non-merohedral twinning. What you describe is non-merohedral twinning. In fact twinning has been (re)discovered by most of the biological community after the remarkable

Re: [ccp4bb] Regarding difference in ITC and structure data

2020-08-01 Thread DUMAS Philippe (IGBMC)
Monika Did you try ITC experiments at different temperatures ? Delta H may be null, or close to zero, at some temperature without implying that there is no binding ! Philippe Dumas De: "monika chandravanshi" À: "CCP4BB" Envoyé: Samedi 1 Août 2020 09:57:24 Objet: [ccp4bb] Regarding diffe

Re: [ccp4bb] disinfecting keyboards

2020-04-29 Thread DUMAS Philippe (IGBMC)
I got a good advice about it: inject WhiteHouse disinfectant right into the cpu. Good to repeat it a couple of times, but wear mask and gloves against possible Cotrump-16-20 last attacks ! Hope it will be helpful. Philippe Dumas (#SupportFauci) - Mail original - De: "Jurgen Bosch" À:

Re: [ccp4bb] CCP4BB vs COVID19

2020-03-22 Thread DUMAS Philippe (IGBMC)
Relevant to the discussion: * Cell, Vol. 110, 551–561, September 6, 2002, Copyright 2002 by Cell Press An RNA Thermosensor Controls Expression of Virulence Genes in Listeria monocytogenes * Bacterial RNA thermometers: molecular zippers and switches Jens Kortmann and Franz Narberhaus NATURE

Re: [ccp4bb] ITC Stoichiometry

2020-02-21 Thread DUMAS Philippe (IGBMC)
Dear Angshu The answer to your question requires to define precisely the term of "stoichiometry". *If you consider the hexamer as "the molecule B", then the expected stoichiometric ratio is 1/1 (one molecule A should bind to 1 hexamer B). *But if you consider the monomer of B as "the molecule"

Re: [ccp4bb] ITC question -dimer vs monomer

2019-10-03 Thread DUMAS Philippe (IGBMC)
Dear Bernhard I share your intuition: we should expect to observe different shapes of titration curves depending on whether A or B2 is in the syringe (titration and reverse titration). I suppose that you want to test your hypothesis that, eventually, you get A2B2. Independently of any kinetic

Re: [ccp4bb] Interesting pattern on a crystallization drop

2019-03-28 Thread IGBMC
Le Jeudi 28 Mars 2019 12:03 CET, jai mohan <0cab66323371-dmarc-requ...@jiscmail.ac.uk> a écrit: A friend of mine (Angel Piñeiro) just suggested to me the "Maragoni effect", which is likely active in the dancing droplets from Stanford and might explain the "explosion" into separate bubbles.

Re: [ccp4bb] Interesting pattern on a crystallization drop

2019-03-27 Thread IGBMC
Le Mercredi 27 Mars 2019 19:44 CET, Beatriz Gomes Guimaraes a écrit: In four days from now, I (everyone) would have taken this as a Photoshop joke... Quite amazing! Is it reproducible? What is the protein? Tubulin ? ::)) Philippe Dumas > Dear all, > > > I would like to share with you a surpri

Re: [ccp4bb] acceptable difference between Average B-factor and Wilson B

2019-03-12 Thread IGBMC
Le Mardi 12 Mars 2019 19:55 CET, Dale Tronrud a écrit: Dale Good to have the opportunity of going back to the crystallography of the fifties in these post-modern times... There is an essential argumentation that should be recalled. The only reason for the fact that one ignores low-resolution d

Re: [ccp4bb] Purchasing slides with diffraction gratings for teaching diffraction

2019-03-05 Thread IGBMC
Le Mardi 5 Mars 2019 10:41 CET, "Roversi, Pietro (Dr.)" a écrit: Many years ago I did teaching on diffraction by illustrating the major aspects of crystal structure determination with 2D crystals on 24x36 films. The crystal was an 80x60 repeats of the famous Einstein's tongue and MIR was illu

[ccp4bb] AW: [ccp4bb] AW: [ccp4bb] AW: [EXTERNAL] [ccp4bb] translational NCS & twinning

2019-01-11 Thread IGBMC
cell, so I would also try molecular replacement > with the ensemble of molecules you got in the small unit cell. > > My two cents, > Herman > > > -Ursprüngliche Nachricht- > Von: DUMAS Philippe (IGBMC) [mailto:p.du...@ibmc-cnrs.unistra.fr] > Gesendet: Freitag, 11

Re: [ccp4bb] AW: [ccp4bb] AW: [EXTERNAL] [ccp4bb] translational NCS & twinning

2019-01-11 Thread IGBMC
Le Vendredi 11 Janvier 2019 09:07 CET, herman.schreu...@sanofi.com a écrit: Dear Herman, As far as I understood the twinning problem, what you say is only true in some occasions, and not in others. If the "macroscopic" domains are so small that they are smaller than the X-rays coherence length,

Re: [ccp4bb] Compound with flexible conformation but nM Kd

2018-04-27 Thread IGBMC
otein > > (tyrosine ring). Is it possible that the hydrophobic substituent could > > facilitate the formation of this pi-pi interaction but not necessary > > to involve in the interaction? Thanks. > > > > Kind regards, > > Wenhe > > > >> On Ap

Re: [ccp4bb] Compound with flexible conformation but nM Kd

2018-04-26 Thread IGBMC
Le Jeudi 26 Avril 2018 16:50 CEST, WENHE ZHONG a écrit: Just to be sure: how was the nM affinity evaluated ? By in vitro measurements, or by obtaining an IC50 by tests on cells ? Of course, if you are mentioning an IC50, you may have a measurement of the efficacy of drug entrance in the cells