--- Chad Cooper <[EMAIL PROTECTED]> wrote:
[?bryon wrote:]
> > In other words, you cannot define the races
> exclusively by these
> > things. Linking that back to his original point:
> Since no one factor
> > defines a race, races are defined as a grouping of
> set of traits. The
> > problem is, there are always exceptions to the set
> of traits used for
> > classification (ie: blacks with blond hair or
> light skin). So in the end,
> > he argues, trying to define the divisions between
> the races is pointless.
>
> I remember reading a Hardy Boy's book ages ago,
> where they stated they could
> differentiate between races with sweat. Does this
> fall within the realm of exceptions?
AFAIK, this isn't the case. The only 'sweat test' I
recall that checks chemistry is for cystic fibrosis
(chloride transport is impaired, so there's less salt
in CF patients' sweat).
There are of course differences in melanin content,
and possibly melanosome transport (organelles that
contain melanin and are 'exported' from melanocytes to
surrounding cells), as well as hair type and
apparently fibroblast type/distribution (which would
tie into an earlier comment that keloids ('exuberant
scar tissue') tend to form more in people of color),
but according to this 2002 article more study needs to
be done for proper care of non-Caucasian skin:
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11807469&dopt=Abstract
This study found similar sweat electrolytes in healthy
Nigerian males compared to Caucasian males after
treadmill exercise:
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=7923348&dopt=Abstract
This study found increased concentrations of manganese
in an exposed population of Australian
aboriginals,[what do they prefer to call themselves,
you Down Under? Many Native Americans now prefer
"First Nations" as a designation here in the US.]
compared to Caucasians in the same area:
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2781270&dopt=Abstract
(I'd think that if these were 'living off the land,'
they'd of course have much higher exposure than whites
who bought non-locally-grown-food from a store.)
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=8601658&dopt=Abstract
Racial differences in skin function occur and may be
responsible for differences in skin reactivity in
physiologic and pathologic conditions. This article
reviews the main racial anatomic and physiologic
differences as well as mechanisms of irritation,
sensitization, and drug absorption reported in the
recent literature. Racial differences in
transcutaneous penetration of chemicals and drug
absorption have been described. Decreased
transcutaneous penetration has been reported in black
persons. In contrast, conflicting findings have been
reported concerning some aspects of irritation and
sensitization. Decreased erythematous reactions have
been found in pigmented skin, whereas white persons
have a stronger resistance to water barrier damage.
Regional variation in skin function is more evident in
fair skin because of the modifying effects of
long-term UV exposure.
This has a good description of skin structure,
function and continues on to hair, nails, sweat glands
etc. 'Cutaway views' of the structures are drawn.
http://www.skinpilot.de/Willkommen_engl/Uebersicht_engl/Die_Haut_engl/Aufbau_und_Funktion_engl/Oberhaut__Epidermis__engl/body_oberhaut__epidermis__engl.html
Debbi
The Skin We're In Maru :)
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