Gerard, I happen to have inherited a copy of Sir John's book from Joe Becker some years ago.
Don't get your hopes up as the effect is apparently unexplained: "No satisfactory explanation for these features has yet been found, but they are probably related to defects in the crystal lattice." Perhaps it is useful to think of the function (Bessel?) that when convoluted with the lattice and molecular transform, would give rise to this phenomenon. It would be interesting to see if, on very long exposure, a second concentric ring appeared further out from the spot. Best- Steve -----Original Message----- From: CCP4 bulletin board [mailto:ccp...@jiscmail.ac.uk] On Behalf Of Julian Nomme Sent: Friday, October 29, 2010 2:10 PM To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] Strange spots Google books: http://books.google.com/books?id=RqNb241Q484C&printsec=frontcover&dq=Mac romolecular+Crystallography+with+Synchrotron+Radiation&hl=en&ei=JA3LTMe2 NMSnnQfAjN3mDw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CC8Q6AEwAA#v= onepage&q&f=false <http://books.google.com/books?id=RqNb241Q484C&printsec=frontcover&dq=Ma cromolecular+Crystallography+with+Synchrotron+Radiation&hl=en&ei=JA3LTMe 2NMSnnQfAjN3mDw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CC8Q6AEwAA#v =onepage&q&f=false> Julian On 10/29/10 1:01 PM, Jrh wrote: > Dear Gerard > I will do a scan of fig 8.1b asap, probably Monday. > Greetings, > John > > > Sent from my iPad > > On 29 Oct 2010, at 18:44, Gerard Bricogne<g...@globalphasing.com> wrote: > > >> Dear John, >> >> Would it be possible to know more about what you are referring to >> without having to buy (or steal) your book :-)) ? >> >> Thank you in advance! >> >> >> With best wishes, >> >> Gerard. >> >> -- >> On Fri, Oct 29, 2010 at 06:41:51PM +0100, John R Helliwell wrote: >> >>> Dear Dave, >>> You have a collector's item there! >>> The closest I have seen is illustrated in my book 'Macromolecular >>> Crystallography with Synchrotron Radiation' page 321, which is a small >>> molecule example. >>> Best wishes, >>> John >>> Prof John R Helliwell DSc >>> >>> >>> On Fri, Oct 29, 2010 at 5:08 PM, David Goldstone >>> <david.goldst...@nimr.mrc.ac.uk> wrote: >>> >>>> Dear All, >>>> >>>> Does anyone have any insight into what the circles around the spots might >>>> be? >>>> >>>> cheers >>>> >>>> Dave >>>> -- >>>> David Goldstone, PhD >>>> National Institute for Medical Research >>>> Molecular Structure >>>> The Ridgeway >>>> Mill Hill >>>> London NW7 1AA >>>> >>>> >>>> >>> >>> >>> -- >>> Professor John R Helliwell DSc >>> >> -- >> >> =============================================================== >> * * >> * Gerard Bricogne g...@globalphasing.com * >> * * >> * Global Phasing Ltd. * >> * Sheraton House, Castle Park Tel: +44-(0)1223-353033 * >> * Cambridge CB3 0AX, UK Fax: +44-(0)1223-366889 * >> * * >> =============================================================== >> > Notice: This e-mail message, together with any attachments, contains information of Merck & Co., Inc. (One Merck Drive, Whitehouse Station, New Jersey, USA 08889), and/or its affiliates Direct contact information for affiliates is available at http://www.merck.com/contact/contacts.html) that may be confidential, proprietary copyrighted and/or legally privileged. It is intended solely for the use of the individual or entity named on this message. If you are not the intended recipient, and have received this message in error, please notify us immediately by reply e-mail and then delete it from your system.
