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Dear Ian, many thanks for this clarification - I have to think about this, though ;-) Best regards, Dirk. Am 12.01.2009 um 12:09 schrieb Ian Tickle: > 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 ******************************************************* 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] *******************************************************