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... despite these informations, I still prefer "structure factor amplitude", because it is the amplitude of the "structure factor" ... Best regards, Dirk. Am 12.01.2009 um 11:42 schrieb Ian Tickle: > I was taught 'structure amplitude' - makes perfect sense to me! Why > does 'structure amplitude' make any less sense than 'structure > factor'? > > It also clearly made sense to Phil Coppens, a crystallographer of > considerable repute, see ITC Vol. B (2nd Ed.), sect 1.2., p.10: 'The > Structure Factor'. To quote the introduction to the section: "The > 'structure factor' is the central concept in structure analysis by > diffraction methods. Its modulus is called the 'structure > amplitude'". > > Also I did a 'Google vote' for the two terms. 'Structure amplitude' > has > 11300 hits. 'Structure factor amplitude' has only 4750. So all > round I > would say that 'structure amplitude' wins by a considerable margin. > > Cheers > > -- Ian > >> -----Original Message----- >> From: [log in to unmask] >> [mailto:[log in to unmask]] On Behalf Of Pavel Afonine >> Sent: 11 January 2009 03:01 >> To: Ethan A Merritt >> Cc: [log in to unmask] >> Subject: Re: [ccp4bb] structure (factor) amplitude >> >> >> >> On 1/10/2009 5:14 PM, Ethan A Merritt wrote: >> >> On Saturday 10 January 2009, Bernhard Rupp wrote: >> >> >> Dear All, >> >> I am getting conflicting comments on the use of >> 'structure factor amplitude' >> vs. just >> 'structure amplitude' >> for |F|. >> >> >> >> ??? >> That's just... odd. >> >> |F| is the amplitude of F. >> But no way F is a "structure". >> >> >> >> I agree. If F is a structure factor then |F| is a structure >> factor amplitude. "structure amplitude" doesn't make much sense... >> Pavel. > > > Disclaimer > This communication is confidential and may contain privileged > information intended solely for the named addressee(s). It may not > be used or disclosed except for the purpose for which it has been > sent. If you are not the intended recipient you must not review, > use, disclose, copy, distribute or take any action in reliance upon > it. If you have received this communication in error, please notify > Astex Therapeutics Ltd by emailing [log in to unmask] > and destroy all copies of the message and any attached documents. > Astex Therapeutics Ltd monitors, controls and protects all its > messaging traffic in compliance with its corporate email policy. The > Company accepts no liability or responsibility for any onward > transmission or use of emails and attachments having left the Astex > Therapeutics domain. Unless expressly stated, opinions in this > message are those of the individual sender and not of Astex > Therapeutics Ltd. The recipient should check this email and any > attachments for the presence of computer viruses. Astex Therapeutics > Ltd accepts no liability for damage caused by any virus transmitted > by this email. E-mail is susceptible to data corruption, > interception, unauthorized amendment, and tampering, Astex > Therapeutics Ltd only send and receive e-mails on the basis that the > Company is not liable for any such alteration or any consequences > thereof. > Astex Therapeutics Ltd., Registered in England at 436 Cambridge > Science Park, Cambridge CB4 0QA under number 3751674 ******************************************************* Dirk Kostrewa Gene Center, A 5.07 Ludwig-Maximilians-University Feodor-Lynen-Str. 25 81377 Munich Germany Phone: +49-89-2180-76845 Fax: +49-89-2180-76999 E-mail: [log in to unmask] *******************************************************