Stable Isotope Geochemistry


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Noreen Tuross <[log in to unmask]>
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Stable Isotope Geochemistry <[log in to unmask]>
Sat, 9 Apr 2005 19:14:28 -0400
text/plain (34 lines)
There's a good book called Avian Biochemistry and Molecular Biology by Lewis
Noreen Tuross
Quoting Roy Krouse <[log in to unmask]>:

> Fellow Fellow Isotopists,
> Over many years, I have been measuring S-isotope compositions in a variety
> of biological tissues/minerals including hair, nails, tusks, baleen, teeth,
> and feathers. The data can be qualitatively related to the isotopic
> composition of diet and in turn, environments but it would be desirable to
> know more about uptake/conversion processes. My understanding is that
> assimilatory conversion of sulfate to organic-S  resides in the plant and
> bacteria domains and is not present in the biochemistry of higher members of
> food chains. The latter can inter-convert S-amino acids and such reactions
> are described in biochemistry textbooks. There are also articles in medical
> journals on topics such as the formation of cystine kidney stones because
> enzymatic scission to two more soluble cysteine molecules is flawed. I have
> also learned from our measurements of S- and O-isotope composition of
> sulfate that most sulfate in fluids and minerals of animals is derived from
> oxidation of organic-S.
> I am trying to find information on the quantities and incorporation of
> different S-amino acids into biological tissues. Feathers are of particular
> interest because of a recent collaborative study with Darren Grocke on
> sulfur in cockatoo feathers.  Does anyone know of data for amino acid
> analyses of feathers? Have there been studies whereby birds/animals have
> been fed a specific S-amino acid to see how this alters the S-amino acid
> distribution in different components of the consumer...either by chemical
> analyses and perhaps isotopic labelling techniques?
> Thank You;
> Roy Krouse