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Icarus
27162.  Mon Oct 17, 2005 5:02 pm Reply with quote

What causes it?



Quote:
At one time or another, dandruff has been blamed on dry skin, oily skin, shampooing too often or not often enough, a poor diet, stress, and the use of too many fancy styling products. Although some of these factors may exacerbate or contribute to scalp flaking, the real culprit may be a fat-eating, yeast-like fungus called malassezia, formerly known as pityrosporum.

Malassezia lives on the scalps of most healthy adults without causing problems. But sometimes it grows out of control, feeding on the oils secreted by your hair follicles and causing irritation that leads to increased cell turnover.

All skin cells die and are replaced by new cells. Normally, it takes about a month for new cells to move from the lowest layer of your skin, where they form, to the outermost layer, where they die and scale off in flakes. Because cells renew themselves slowly, this process usually isn't noticeable.

But on scalps where malassezia thrives, the whole process can take as little as 11 days. The result is a large number of dead skin cells. As the cells fall off, they tend to clump together with oil from your hair and scalp, making them appear white, flaky and all too visible.

Exactly what causes an overgrowth of these organisms isn't known, although increased oil production, hormonal fluctuations, stress, illness, neurologic disorders such as Parkinson's disease, a suppressed immune system, infrequent shampooing, extra sensitivity to the malassezia fungus and even heredity may contribute to the development of dandruff.


http://www.mayoclinic.com/invoke.cfm?objectid=F8F56A90-7CF0-4E06-A079CA10DE146B1E&dsection=3

 
Icarus
27163.  Mon Oct 17, 2005 5:08 pm Reply with quote

And for a more general use of the word, here's how dandruff relates to global warming (by way of cloud formation)

Quote:
No day goes by without another story regarding global warming, and the latest news has scientists throughout the world scratching their heads about climate change. A team of scientists reports in the prestigious journal Science that dandruff levels in the atmosphere are surprisingly high, and the load of biological aerosols from flaking skin, fur, and pollen can make up between 25% and 80% of the aerosols in the atmosphere. These aerosols are important building blocks for clouds, and clouds remain the greatest mystery in the global warming debate. If our future has more high clouds, any greenhouse warming will be amplified, but if our future has more low clouds, their ability to reflect away solar radiation will dampen any warming caused by elevated concentrations of greenhouse gases. Clouds are widely recognized to be the wild cards in the greenhouse debate, and at present, clouds are notoriously poorly represented in numerical models of climate. The latest news about dandruff has implications for future clouds, and the results from the German team mean more uncertainty in predicting the future climate.

In 1990, concern over global warming prompted the United Nations to publish its first major scientific assessment by the Intergovernmental Panel on Climate Change (IPCC). Almost all of that assessment dealt with the climate impact of elevated atmospheric concentrations of carbon dioxide and other greenhouse gases. Only two years later, the IPCC released an amended report that included the effects of sulfate aerosols, which come from fossil fuel burning, and once in the atmosphere, reflect sunlight, brighten clouds, and make clouds last longer. Sulfates have a cooling effect that must be considered in predicting future temperatures of the Earth. By 1995, the IPCC scientific assessment was expanded to include the global and regional climatic effects of various greenhouse gases, stratospheric ozone, tropospheric ozone, sulfate aerosols, fossil fuel soot, biomass burning, mineral aerosols, and variations in solar output. The IPCC scientists added black carbon, organic carbon, jet contrails, and land-use changes to the list in 2000. This all lead Dr. James Hansen, a prominent greenhouse scientist with NASA's Goddard Institute for Space Studies, to write in the Proceedings of the National Academy of Sciences "The forcings that drive long-term climate change are not known with an accuracy sufficient to define future climate changes."

The global warming scientific debate at times seems to be a squabble regarding how quickly the Earth is warming (or if it is warming at all), where the warming is occurring, the time of year of any warming, whether the warming is good or bad, or most importantly, whether policy actions would have any impact on the warming. The latest report from the German scientists about dandruff, fur, and pollen is a reminder that our knowledge of controls on the climate system is far from complete, and as we see in the IPCC reports, new "forcings" of climate are added in each major assessment. Even if we had perfect temperature records of the Earth and numerical models that accurately simulated the climate system, we do not know enough about how the various "forcings" will impact the climate system over the next 50 to 100 years.

We are all itching to know what will happen to the climate system over the next century, and year after year, scientists make discoveries that further complicate predicting climate into the future. And while the climatologists grapple with atmospheric questions, others are left to determine how many people will be on the Earth in the future, if developing economies develop or remain stagnant, if there will be breakthroughs in energy generation, and on and on. Uncertainties in these arenas are as great or greater than uncertainties in climate models, temperature records, or the factors that will change the climate system over the coming decades.

We cannot wash away these uncertainties in any discussion of policy actions, and as we see in the latest news about dandruff, important changes to the atmosphere may be undiscovered at this time. Anyone claiming to know where we are headed climatically, with or without policy actions, is disregarding the complexities in predicting the future climate of the Earth


Courtesy of Dr. Robert C. Balling, Jr. Department of Geography, Arizona State University
http://www.techcentralstation.com/040505C.html

 
Icarus
27167.  Mon Oct 17, 2005 5:13 pm Reply with quote

And for Halloween.
..dandruff, dandruff so tasty to eat
make me some more of that Dutch treat...

Quote:
Dutch Dandruff^

Recipe By :
Serving Size : 1 Preparation Time :0:00
Categories : Halloween

Amount Measure Ingredient -- Preparation Method
-------- ------------ --------------------------------
Vegetable shortening
Flour
1 can (16 oz) dark chocolate
Frosting
Maraschino cherries
1 Fruit roll up for tongue
1 can (3 1/2 oz) coconut flakes
-----TOOLS-----
Bowl
Mixer
2 (9") cake pans
Wire cooling rack
Knife
Ziploc bag
Scissors
Cake plate

With an adult's help, preheat oven to temperature on package.

Grease the inside of both cake pans with vegetable shortening, then lightly
dust with flour. Prepare and bake cake according to package directions. After
removing cake from pans, allow to cool on wire rack for at least 1/2 hour.

Place one layer upside down on cake plate. Spread a thin layer of frosting on
top only, then carefully place the second layer on top of the first layer.

Fill ziploc bag with the rest of the frosting and twist the top tightly shut.
Using scissors, cut off a TINY bottom corner of the bag.

To decorate: Think of the top of the cake as the top of a human head and
imagine a part running down it's middle. Now, using the plastic bag of icing as
a pastry bag, squeeze a stream of frosting hair falling from the imaginary part
down the side of the c
Using a dab of frosting, glue two cherries on the cakes face for eyes and one
for a nose. then, using clean scissors, carefully cut a piece of fruit roll
into
the shape of a tongue. Fold tongue in half lengthwise to form a realistic
crease
down the middle
Sicko serving suggestion: Stick a sterilized comb or afro pick in the side of
your cakes head!
From the Book: Gross Grub by Cheryl Porter Random House ISBN 0-679-86693-0
Shared by Carolyn Shaw 10-95
1 pk (18 1/2oz) devils food cake mix, pkus ingredients specified on package


http://www.recipesource.com/holiday/halloween/dutch-dandruff1.html

 
Frances
28670.  Fri Oct 28, 2005 10:32 am Reply with quote

Talking about clouds - why should anybody feel they're a great mystery?

Rain falls from clouds; it trickles and flows into streams, rivers, eventually the sea; it falls off the edge of the world as a never-ending waterfall - Terry Pratchett has almost the right idea; it lands in the fires of Hell below; since these are, by definition, inextinguishable, the water therefore turns to steam, which rises up past the edge of the world again and forms - guess what?

Simple.

 
bobofel
47860.  Thu Jan 26, 2006 11:56 am Reply with quote

Icarus said
Quote:
We are all itching to know what will happen to the climate system over the next century


Is this meant to be a pun?

I found another site on the global warming problem: http://www.newscientist.com/channel/earth/mg18624945.300

 
Celebaelin
47894.  Thu Jan 26, 2006 3:16 pm Reply with quote

Quote:
On September 19, 1985, Zappa testified before the US Senate Commerce, Technology, and Transportation committee, attacking the Parents Music Resource Center or PMRC, a music censorship (though others would say watchdog) organization founded by then-Senator Al Gore's wife Tipper Gore and including many other political wives, including the wives of five members of the committee. He said;

"The PMRC proposal is an ill-conceived piece of nonsense which fails to deliver any real benefits to children, infringes the civil liberties of people who are not children and promises to keep the courts busy for years dealing with the interpretational and enforcemental problems inherent in the proposal's design.
"It is my understanding that, in law, First Amendment issues are decided with a preference for the least restrictive alternative. In this context, the PMRC's demands are the equivalent of treating dandruff by decapitation."

http://en.wikipedia.org/wiki/Frank_Zappa

 
Caradoc
47927.  Thu Jan 26, 2006 6:39 pm Reply with quote

Right now we know what causes dandruff, what cures it?

 
gerontius grumpus
47943.  Fri Jan 27, 2006 3:55 am Reply with quote

I used to hate the Shed and Holders advert which went:-

"I didn't know you had dandruff".

"I don't".


Didn't quite make sense to me.

 
Tas
47945.  Fri Jan 27, 2006 4:22 am Reply with quote

In otherwords, I don't have dandruff because I use shed and holders to control the causes... as opposed to 'I have dandruff, but am trying to get reid of it. So, I use Shed and Holders".

:-)

Tas

 
bobofel
48347.  Mon Jan 30, 2006 8:58 am Reply with quote

would some type of anti-bacterial cream help with it?

 
Gray
48357.  Mon Jan 30, 2006 9:45 am Reply with quote

Not using shampoo would seem to be a good cure for dandruff because it wouldn't be constantly forcing your scalp to produce more oils (which is what can cause it). Getting rid of the hair's natural oils seems to be a rather odd thing to do, but we've been tricked into continuing doing it by the cosmetic companies. Once you start, your hair gets used to producing more and more, and you have to continue.

Anyone here tried that '6 months without shampoo' to see if your hair really does go all lustrous and lovely again?

 
djgordy
48360.  Mon Jan 30, 2006 9:58 am Reply with quote

Gray wrote:

Anyone here tried that '6 months without shampoo' to see if your hair really does go all lustrous and lovely again?


Yes I did. Your hair goes really manky for a while but if you can put with it then eventually it settles down. The trouble is that if you live in the city then you get all sorts of grime in your hair so you still have to wash all that out with warm water. Because I started to go swimming a lot I had to go back to shampoo to get rid of the chlorine.

 
gerontius grumpus
48432.  Mon Jan 30, 2006 5:57 pm Reply with quote

Tas wrote:
In otherwords, I don't have dandruff because I use shed and holders to control the causes... as opposed to 'I have dandruff, but am trying to get reid of it. So, I use Shed and Holders".

:-)

Tas


I know that's what they meant but it seemed a bit mixed up, like it should have been "I haven't".
Or "I hadn't".

 
Gray
48502.  Tue Jan 31, 2006 7:47 am Reply with quote

Quote:
The trouble is that if you live in the city then you get all sorts of grime in your hair so you still have to wash all that out with warm water. Because I started to go swimming a lot I had to go back to shampoo to get rid of the chlorine.

That's the clincher isn't it: you can live a simpler life without modern contrivances, but not if you want to live a simpler life without a modern environment. I.e. you can live without shampoo, but only if you live in a log cabin in the hills...

 
bobofel
48505.  Tue Jan 31, 2006 8:23 am Reply with quote

and what's wrong with log cabins?

 

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