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Vitamin D dysregulation
Sarcoidosis frequently causes an increase in vitamin D production outside the kidney. Macrophages inside the granulomas convert vitamin D to its active form, resulting in elevated levels of the hormone 1,25-dihydroxyvitamin D and symptoms of hypervitaminosis D that may include fatigue, lack of strength or energy, irritability, metallic taste, temporary memory loss or cognitive problems. Physiological compensatory responses (e.g., suppression of the parathyroid hormone levels) may mean the patient does not develop frank hypercalcemia. This condition may be aggravated by high levels of estradiol and prolactin such as in pregnancy, leading to hypercalciuria and/or compensatory hypoparathyroidism. High levels of Vitamin D are also implicated in immune-system dysfunctions which tie into the sarcoid condition.
Originally posted by ArMaP
That paper points three possible ways of doing it: spreading the particles on the stratosphere (it doesn't say at what altitudes), on low Earth orbit or orbiting the Sun in a way to make a shadow over the Earth.
The easiest and cheapest way is by using the stratosphere, but they only speak about rockets, so I think they were talking about higher altitudes than the ones used by commercial aeroplanes.
Source: Page 16 e-reports-ext.llnl.gov...
Materials such as Al or Si, which auto-coat with durable, oxygen-impervious, high-integrity oxide-skins
of only a few monolayers thickness, might be aptly employed in lieu of graphitic nanotubes for transparently
jacketing such dye-loaded-glasses against stratospheric conditions. Alternatively, use of perfluorohydrocarbons as the dye-bearing material may obviate the need for any protective jacketing, as well as simplify the mass-production of such scattering units. The corresponding scattering systems may be the ones of choice within this preferred class of quasi-resonant scattering units,
simply because the dye-bearing fluid could be stratospherically dispersed from an airplane tank as a suitably fine aerosol, the individual nanoparticles of which would quick-freeze at stratospheric temperatures and thereupon become photochemically inert over multi-year time-scales.
While significantly greater total mass might have to be deployed to constitute such a scattering system, the simplicity and relatively low technical risk with which the system could be created and deployed might be an overriding consideration.
Originally posted by sprtpilot
Very odd. Just in the last week I was outside doing some work and got a sunburn after a relatively short time and while wearing a ballcap- my scalp still burned.