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VITAMIN D METABOLISM. “A characteristic of animals that depend on solar UVB radiation to supply cholecalciferol is that its precursor, 7-dehydrocholesterol, the penultimate metabolite in the synthesis of cholesterol, accumulates in superficial skin cells.” https://lnkd.in/e5hTuW74 View in LinkedIn

IMPACT ON VITAMIN D. “One of the effects of UVB radiation is that it acts on 7-dehydrocholesterol in cells of the superficial integument of terrestrial animals to make, by a photochemical reaction, the pre-hormone, cholecalciferol.” https://lnkd.in/e5hTuW74 View in LinkedIn

ULTRAVIOLET BLOCKER. “In the steady atmospheric state of the present-day era, the intensity of UV light reaching the Earth's surface is attenuated by ozone. However, the UVB-absorbing power of SO2 is 2·5 times greater than that of ozone.” https://lnkd.in/e5hTuW74 View in LinkedIn

The determination of hope over experience. View in LinkedIn

“PLATO concludes that the body is composed of the same elements as the universe, and that, finally, the universe is ruled by mind.” (Page 104). https://lnkd.in/eq8pQ57b View in LinkedIn

SULFUR DIOXIDE ANOMALY. “One biologically significant property of stratospheric SO2 is that it strongly absorbs solar UV light in the UVB wavelength range of 290 to 320 nm.” https://lnkd.in/e5hTuW74 View in LinkedIn

SULFATE STORY. “One estimate is that 326–527 gigatonnes of SO2 were distributed globally in the stratosphere. Another, in broad agreement, put the quantity of stratospheric SO2 in the range of 200–400 gigatonnes.” https://lnkd.in/e5hTuW74 View in LinkedIn

BLOCKING THE SUN. “A result of the asteroid impact would have been the ejection into the stratosphere of particulate carbon soot, CO2 and sulfate aerosols. This would have had a marked cooling effect on the climate from the absorption of much solar radiation.” https://lnkd.in/e5hTuW74 View in LinkedIn

TYPE OF DUST. “The Chicxulub site contains vast amounts of limestone (CaCO3), anhydrite (CaSO4) and gypsum (CaSO4.2H2O) as well as hydrocarbons.” https://lnkd.in/e5hTuW74 View in LinkedIn

DUST AND AEROSOL CLOUD. “The consequences of that impact would indeed have been catastrophic, not just in the geographic region around the impact site, but worldwide because of environmental changes from an atmospheric dust and aerosol cloud that would have remained for years in the stratosphere.” https://lnkd.in/e5hTuW74 View in LinkedIn