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I think there's a confusion here between the name of an object (what you call it) and its description (i.e. its properties). The name of the object is "structure amplitude" and it's description is "amplitude of the structure factor", or if you prefer the shortened form "structure factor amplitude". This distinction was of course carried to absurdity in "Alice through the Looking Glass": "It's long." said the Knight, "but it's very, very beautiful. Everybody that hears me sing it - either it brings tears to their eyes, or else -" "Or else what?" said Alice, for the Knight had made a sudden pause. "Or else it doesn't, you know. The name of the song is called 'Haddocks' Eyes.'" "Oh, that's the name of the song, is it?" Alice said, trying to feel interested. "No, you don't understand," the Knight said, looking a little vexed. "That's what the name is called. The name really is 'The Aged, Aged Man.'" "Then I ought to have said 'That's what the song is called'?" Alice corrected herself. "No you oughtn't: that's another thing. The song is called 'Ways and Means' but that's only what it's called, you know!" "Well, what is the song then?" said Alice, who was by this time completely bewildered. "I was coming to that," the Knight said. "The song really is 'A-sitting On a Gate': and the tune's my own invention." Cheers -- Ian > -----Original Message----- > From: [log in to unmask] > [mailto:[log in to unmask]] On Behalf Of Dirk Kostrewa > Sent: 12 January 2009 10:52 > To: CCP4BB > Subject: Re: [ccp4bb] structure (factor) amplitude > > ... 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] > ******************************************************* > > 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