Talk:Glycine
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[edit] Photography and Glycine
This does not belong in the category of photographic chemicals. Nowhere in the article does it mention photography, or its use in film making, or any other sort of chemical relation to photography in any way, shape or form. I'm removing it from this category as per the reason I just gave. Cernen Xanthine Katrena 10:40, 23 January 2006 (UTC)
- I have removed the Glycin redirect and replaced it with a Glycin article, as Glycin and Glycine are two different things entirely. Cernen Xanthine Katrena 19:03, 23 January 2006 (UTC)
[edit] Glycine a zwitterion?
Is glycine a zwitterion? If so, then there is incongruity as glycine states that it is non-polar, but zwitterion suggests that it is polar. Anyone know? Ydnagaj 20:29, 6 February 2007 (UTC)
- I note that an anonymous editor changed polar to nonpolar in November, I just changed it back. I'm an organic chemist, not a biochemist, but as far as I know all standard amino acids are zwitterions, at least in aqueous solution. I assume that the term "polar amino acid" is a relative term, meaning that something like phenylalanine with a hydrocarbon group attached would class as a "nonpolar amino acid" (though still a zwitterion). Can a biochemist please confirm that I'm not talking through my hat? Walkerma 06:01, 11 February 2007 (UTC) While I am no biochemist, I do happen to have a textbook right in front of me. The propteries of glycine are described under the heading "Polar, Uncharged Amino Acids", in Garret and Grisham's Principles of Biochemistry: With a Human Focus ISBN 0-03-097369-4 . "The polar, uncharged amino acids except for glycine contain R groups, that can form hydrogen bonds with water. Thus, these amino acids are usually more soluble that non-polar amino acids." It continues later on "Glycine, the simplest amino acid, has only a single hydrogen for an R group, and this hydrogen is not a good hydrogen bond former. Glycine's solubility properties are mainly influenced by its polar amino and carboxyl groups, and thus glycine is best considered a member of the polar, uncharged group." Hybrid04 05:44, 6 March 2007 (UTC)
[edit] Some thoughts: glycine <-> glycine
1. I am not a chemist.
2. I am confused: ...
- "it [glycine] is synthesized in the body from other metabolites, including glycine". The way this comes out sounds a bit funny (no offense), at least to me - what would be the energetic gain of resynthesis? glycine -> glycine?
- Also, the language could be improved a little. Eg. "Glycine is [a] unique amino acid that is not optically active." However, I am uncertain whether this sentence is relevant - it seems to have resulted from a discussion on the talk page (I haven't checked history). What it is not is not all that interesting, but I am sure a biochemist could enlighten (pun intended) me on the importance of the difference between photoreactive amino acids vs. non-reactive, perhaps for another wiki article (hint: link).
- Given prior discussion on the talk page, perhaps "...should not be confused with glycin" or similar could be included in the very beginning as a note with a link.
I have not made any edits, these are just thoughts. I leave that for the chemists.
3. Overall, the article is an interesting read ranging from the neurochemical function in the brain to the possible astrochemical occurence in space.
4. At least one of my four comments is useless.
[edit] Logical fallacy in the section "Presence in the Interstellar medium"
In the section "Presence in the interstellar medium" the statement is made that if glycine is found in the interstellar medium, then "[This] finding would indirectly support the idea of panspermia, the theory that life was brought to Earth from space." For this assertion to be logically consistent one must presuppose that this glycine was produced by, or was the progenitor of, a living entity which predates life on Earth which was then brought to Earth. No evidence has been cited to support these predicates.
I am removing the logically inconsistent statements from the article. Mtiffany71 01:30, 29 June 2007 (UTC)
