Uv penetration vitamin d
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Six common sun myths, exposed - CNN
Six common sun myths, exposed
21 Jul The danger of overexposure to solar ultraviolet radiation has been widely reviewed since the s due to the depletion of the ozone layer.
1 Jan During exposure to sunlight 7-dehydrocholesterol in the skin absorbs UV B radiation and is converted to previtamin D3 which in turn isomerizes.
Description:Photolysis of provitamin D3 pro-D3. In hexane pro-D3 is photolyzed to s-cis,s-cis-pre-D3. Once formed, this energetically unstable conformation undergoes a conformational change to the s-trans,s-cis-pre-D3. Only the s-cis,s-cis-pre-D3 can undergo thermal isomerization to vitamin D3. These interactions significantly decrease the conversion of the s-cis,s-cis conformer to the s-trans,s-cis conformer, thereby facilitating the thermal isomerization of s-cis,s-cis-pre-D3 to vitamin D3.