Have you forgotten what you were writing about? Because I was writing about the WFD footage and the kids exposed to quartz, and you jumped out that this is NOT about vitamin D, but about BILIRUBIN. Even though that is precisely NOT what it is about, because there are no newborns with jaundice in the film, and the quartz lamp neither provides the right spectrum nor the exposure could be long enough.
This is an excerpt from my comment, which mentioned both kids with quartz lamps and, as I think is evident, the treatment of jaundice with blue light. You commented on the specific passage about the kids and the quartz lamp, that it is not about vitamin D but about supporting bilirubin reduction. So I ask where is this opinion coming from?
I would just like to add that my guess as to "what UV irradiation was for" is substantiated, among other things, by this passage from the wikipedia article on rickets:
So it would be nice if a colleague would finally address whether the beavers exposed to quartz lamps were for jaundice control or for the production of vitamin D to counteract rickets (or for yet another purpose). Because you still haven't done so, and are only reproducing this information, which is well known and in this topic it was I who first presented it.
As for the importance of vitamin D in the treatment of fractures:
https://pmc.ncbi.nlm.nih.gov/articles/PMC9610653/
Which comes as absolutely no surprise to me.... of course, one has to be careful with vitamin D, because an overdose has even more unpleasant consequences. And yes, in certain concentrations it will also hinder fusion instead of aiding it. However, these are not the concentrations you can get with natural sources of vitamin D.
Quote:.Blue light irradiation (I think around "royal blue") is used in neonatal jaundice when the body cannot cope with bilirubin on its own.
This is an excerpt from my comment, which mentioned both kids with quartz lamps and, as I think is evident, the treatment of jaundice with blue light. You commented on the specific passage about the kids and the quartz lamp, that it is not about vitamin D but about supporting bilirubin reduction. So I ask where is this opinion coming from?
I would just like to add that my guess as to "what UV irradiation was for" is substantiated, among other things, by this passage from the wikipedia article on rickets:
Quote:In 1919, Kurt Huldschinsky applied heliotherapy using an artificial source of UV radiation to treat rickets[9].
In the first decades of the 20th century, it was discovered that a fat-soluble factor called vitamin D, different from vitamin A, had an anti-rickets effect. In 1924, Hess and Weinstock[10] and Steenbock[11] proved that exposure of certain products to ultraviolet radiation confers anti-curvature properties.
So it would be nice if a colleague would finally address whether the beavers exposed to quartz lamps were for jaundice control or for the production of vitamin D to counteract rickets (or for yet another purpose). Because you still haven't done so, and are only reproducing this information, which is well known and in this topic it was I who first presented it.
As for the importance of vitamin D in the treatment of fractures:
https://pmc.ncbi.nlm.nih.gov/articles/PMC9610653/
Which comes as absolutely no surprise to me.... of course, one has to be careful with vitamin D, because an overdose has even more unpleasant consequences. And yes, in certain concentrations it will also hinder fusion instead of aiding it. However, these are not the concentrations you can get with natural sources of vitamin D.