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Matti Narkia

The solar UV radiation level needed for cutaneous production of vitamin D3 in the face.... - 0 views

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    The solar UV radiation level needed for cutaneous production of vitamin D3 in the face. A study conducted among subjects living at a high latitude (68 degrees N).
    Edvardsen K, Brustad M, Engelsen O, Aksnes L.
    Photochem Photobiol Sci. 2007 Jan;6(1):57-62. Epub 2006 Nov 10.
    PMID: 17200737
Matti Narkia

Daily duration of vitamin D synthesis in human skin with relation to latitude, total oz... - 1 views

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    Daily duration of vitamin D synthesis in human skin with relation to latitude, total ozone, altitude, ground cover, aerosols and cloud thickness.
    Engelsen O, Brustad M, Aksnes L, Lund E.
    Photochem Photobiol. 2005 Nov-Dec;81(6):1287-90.
    PMID: 16354110

    Vitamin D production in human skin occurs only when incident UV radiation exceeds a certain threshold. From simulations of UV irradiances worldwide and throughout the year, we have studied the dependency of the extent and duration of cutaneous vitamin D production in terms of latitude, time, total ozone, clouds, aerosols, surface reflectivity and altitude. For clear atmospheric conditions, no cutaneous vitamin D production occurs at 51 degrees latitude and higher during some periods of the year. At 70 degrees latitude, vitamin D synthesis can be absent for 5 months. Clouds, aerosols and thick ozone events reduce the duration of vitamin D synthesis considerably, and can suppress vitamin D synthesis completely even at the equator. A web page allowing the computation of the duration of cutaneous vitamin D production worldwide throughout the year, for various atmospheric and surface conditions, is available on the Internet at http://zardoz.nilu.no/~olaeng/fastrt/VitD.html and http://zardoz.nilu.no/~olaeng/fastrt/VitD-ez.html. The computational methodology is outlined here.
Matti Narkia

Vitamin D effective ultraviolet wavelengths due to scattering in shade - ScienceDirect ... - 0 views

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    Vitamin D effective ultraviolet wavelengths due to scattering in shade.
    Turnbull DJ, Parisi AV, Kimlin MG.
    J Steroid Biochem Mol Biol. 2005 Sep;96(5):431-6. Epub 2005 Jul 6.
    PMID: 16005208
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