[meteorite-list] Oktibbeha County Super Ataxite? ...was The tale of a falling star ... Top Ten re: Ni content

[Mexicodoug]

Darren rote:
">Bernd - 0% Ni content ;-)
Oh, you are some percent Ni. The 0% is likely a rounding error.
http://en.wikipedia.org/wiki/Nickel#Biological_role"

Hi Darren,
I don't think there was any concern with about the floating point 
arithmetic facing programmers with the 0%. Bernd was precise and you 
may have noted the smile.
http://en.wikipedia.org/wiki/Precision_(arithmetic)

Larry wrote:
"I have not been able to find an "average" amount of Ni in humans 
(seems to depend on a lot of things like what kind of oil you consume, 
how far from Sudbury you live, etc.--micrograms per gram of body 
weight). "

Hi Larry,

"A 70 kg [note: American] reference man contains 10 mg of nickel, 
giving an average body concentration of 0.1 ppm...
[Larry: This is 0%; to two significant figures it would be 0.000014% or 
0.14 ppm's, or 140 nanograms per gram, though the context favors only 
one]

Nickel does not bioaccumulate to a great extent in animals...
[note: if you overload, it becomes toxic when the body cannot keep up 
removing it as quickly, especially in the liver and kidneys]

Nickel sensitivity is a form of delayed hypersensitivity that is found 
in 10–20% of the general population..."*
[note: this is at low levels, once triggered, you get the allergy to 
much lower concentrations for life]

Meteoroholics,

If you wish to get a daily allowance of meteorite in your diet, this 
means (ignoring all the o
ther heavy elements haha), that a reasonable 
risk of powdered meteorite to add to a liquid nourishment, eat or snort 
is 10 mg of an iron meteorite, or 100 mg of a chondrite, and not more 
than six of them a week, keeping in mind that ataxites are reserved for 
only a special class of meteorite hunters and excluded for the masses 
at these levels).

The reference Larry quoted says:
"A condition of nickel deficiency has not been clearly defined in 
humans..."

i.e., it's not a good idea to take nickel supplements of any kind, 
unless, well, uh, you know...

Best wishes, Doug (Ni - 0% except when lucky)
*ref.:
Finalized Toxilogical Profile
PB2006-100005 August, 2005.
Agency for Toxic Substances and Disease Registry
(A sister agency to the CDC in Atlanta)
Department of Health and Human Services.
U.S. Government Publication (by Congressional Mandate)








-----Original Message-----
From: lebofsky at lpl.arizona.edu
To: bernd.pauli at paulinet.de
Cc: meteorite-list at meteoritecentral.com
Sent: Sun, Jun 14, 2009 5:26 pm
Subject: Re: [meteorite-list] Oktibbeha County Super Ataxite? ...was 
The tale of a falling star ... Top Ten re: Ni content



Hi Bernd:

I have not been able to find an "average" amount of Ni in humans (seems 
to
depend on a lot of things like what kind of oil you consume, how far 
from
Sudbury you live, etc.--micrograms per gram of body weight). But it is
important.


>From Copperwiki:

"Nickel deficiency is rare in humans as nickel requirements are low and
availability high from dietary sources. A condition of nickel deficiency
has not been clearly defined in humans, though it has been demonstrated 
in
animals. Nickel deficiency in these cases has been shown to affect a
number of functions. The symptoms observed in animal studies include
depressed growth, reproductive changes and altered lipid and glucose
levels in the blood.

Other changes observed in a nickel deficient state include, changes in
skin color, coarse hair, hormone imbalance and abnormal bone growth. 
Liver
function is impaired and iron metabolism is affected, resulting in poor
absorption of iron. Metabolism of some other nutrients like calcium and
vitamin B12 is also altered due to nickel deficiency."

So, yes, you do have a nickel content!


Larry

> "a Ni content of 60%. That might be the record!"
>
> Hi Elton and List,
>
> Yes, it it! Here are the top ten sorted by decreasing nickel content:
>
> Oktibbeha County - 60.1
> Lafayette (iron) - 59.4
> Dermbach - 42.1
> Santa Catharina - 33.8
> Tishomingo - 32.5
> Twin City - 30
> Lime Creek - 29.5
> Willow Grove - 27.9
> Barbianello - 27.1
> San Cristobal - 25.7
>
>
> Bernd - 0% Ni content ;-)
>
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