Dear David, The long-wavelength beamline I23 at Diamond (http://www.diamond.ac.uk/Instruments/Mx/I23.html) can go all way down to the phosphorous edge. While data quality will be obviously compromised by absorption effects (we are working on this), for a reasonably well diffracting crystal like yours we should be able to get anomalous difference fourier maps from data collected above and below the sulphur edge (lambda ~5 A) to answer your question.
We’ve published some test crystal work around the sulphur edge a while ago, you might want to have a look here: https://doi.org/10.1016/j.nimb.2016.12.005 The beamline is currently in an advanced commissioning phase accepting a limited number of projects. So, please get into touch if you are interested. We are currently sorting out a few more hardware and software aspects before we can run the beamline as a standard user facility, but we have made a lot of progress over the past months. There will be more details here on the bulletin board ahead of the next call for proposals in autumn. Best regards, Armin Postdoc position for long-wavelength crystallography: https://vacancies.diamond.ac.uk/vacancy/post-doctoral-research-associate-355285.html On 31/07/2018, 14:38, "CCP4 bulletin board on behalf of David Schuller" <[email protected] on behalf of [email protected]> wrote: How can one distinguish between a sulphate or phosphate in an electron density map? Both are present in the mother liquor, and resolution is in the range of 1.75 - 2.25 A -- ======================================================================= All Things Serve the Beam ======================================================================= David J. Schuller modern man in a post-modern world MacCHESS, Cornell University [email protected] ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1 -- This e-mail and any attachments may contain confidential, copyright and or privileged material, and are for the use of the intended addressee only. If you are not the intended addressee or an authorised recipient of the addressee please notify us of receipt by returning the e-mail and do not use, copy, retain, distribute or disclose the information in or attached to the e-mail. Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd. Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message. Diamond Light Source Limited (company no. 4375679). Registered in England and Wales with its registered office at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1
