On Sun, 9 Nov 2008 19:30 Ashley Moran
wrote:

>Hi Keith
>
>I flagged this thread in case anyone replied, but sadly no-one did.
>Were you able to find an answer?
>
>If not, I saw a book years ago in a shop called the Fats of Life[1]
>which maybe can tell you.  I haven't read it, though.
>
>Ashley
>
>[1] http://www.amazon.co.uk/Fats-Life-Caroline-M-Pond/dp/0521635772

Still looking for an answer for non-scientists, Ashley.

Thanks for the tip. I ordered the book as soon as I read your reply.

Keith