Hi Johner,
Thanks for your edits to Calcium Citrate and Calcium Phosphate — keep up the good work!
Here's your official welcome card:
Welcome!
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Hi there, you added some data on the ionisation of ATP to this page, what source did this come from? I'm trying to improve the referencing of this article. Thanks. TimVickers 19:56, 29 December 2006 (UTC)
Johner,
Arachidonic acid is essential; see the discussion at "What is essential?" and follow the link to the Cunnane discussion.
Thanks for contributing to the EFA discussion.David.Throop 12:38, 26 January 2007 (UTC)
The definition is given in the article Essential fatty acid : "they must be obtained from food as human cells have no biochemical pathways capable of producing them internally."
As far as I understand, this is not the case of arachidonic acid for the adult human since it is stated in Essential fatty acid interactions that "Most AA in the human body derives from dietary linoleic acid".
Following most assumptions, AA is an essential fatty acid for many mammals, the cat for example and perhaps also for infants but it is never considered to be an EFA for adult human. See also the Example section in Essential fatty acid where it is not cited.
Of course the fact that AA is not an EFA for adult human according to the definition does not mean that this acid is not essential for the human body metabolism.
I did not find any convincing information in the obscure Cunnane paper except that AA is probably an EFA for infants. Johner 21:22, 26 January 2007 (UTC)
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OK. The problem is that there are two different definitions for EFA which are used by Wiki contributors, the more restrictive one (sometimes referred to as "truly essential" or "really essential") and the one that you cite.
It is confusing for Wiki readers because only one definition (the restrictive one) is clearly given at the head of Essential fatty acid. It would be useful for the coherence of Wikipedia to give the two definitions at that place and explain that both are used in Wiki articles. Perhaps the new (enlarged) definition will subplant the restrictive one in the future but it must be recognized that the restrictive definition is still used by most authors.Johner 11:14, 27 January 2007 (UTC)
That would be nice. Thank you, David, for your patience and efforts on this subject.Johner 18:13, 27 January 2007 (UTC)
It would be nice to include images of leukotriene molecules in the leukotriene article as has been done for prostaglandins and prostacyclins. Johner 22:34, 27 January 2007 (UTC)
That the equilibrium results are affected by the presence of other ions is not in question. So your annotation is appropriate. But your phrasing makes it sound as if the presence of other ions removes the requirement for electrical neutrality. Of course the solution must be electrically neutral no matter what its ionic content. The presence of other ions simply means that they must be included in the neutrality equation. I haven't thought of a suitable reword for your annotation yet, but I'm posting this to you so that perhaps you will think of it and make the corresponding edit. Karl Hahn (T) (C) 21:50, 12 May 2007 (UTC)
Hi,
I noticed you reverted my spelling correction for "preceding".
Looking at Wiktionary I can find a proceeding and preceding but no preceeding.
Regards,
JohnI (talk) 22:00, 3 January 2008 (UTC)
Hi Johner! Can you have a look at this recent diff and see if it makes any sense. I reverted it pro tem because it was a significant and unsupported change, and asked at WP:WikiProject_Chemistry/Accuracy_disputes for someone to review it but so far nobody has responded. You seem to know the topic well, so I wonder if you would help? Thanks in advance -- Timberframe (talk) 15:17, 21 September 2009 (UTC)
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