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.
>>>
>>>
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>> *******************************************************
>> Dirk Kostrewa
>> Gene Center, A 5.07
>> Ludwig-Maximilians-University
>> Feodor-Lynen-Str. 25
>> 81377 Munich
>> Germany
>> Phone: +49-89-2180-76845
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>
>
> Disclaimer
> This communication is confidential and may contain privileged
> information intended solely for the named addressee(s). It may not
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> 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
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> Astex Therapeutics Ltd., Registered in England at 436 Cambridge
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*******************************************************
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]
*******************************************************
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