منابع مشابه
Photoreactivity of carboxylated single-walled carbon nanotubes in sunlight: reactive oxygen species production in water.
Very limited information exists on transformation processes of carbon nanotubes in the natural aquatic environment. Because the conjugated pi-bond structure of these materials is efficient in absorbing sunlight, photochemical transformations are a potential fate process with reactivity predicted to vary with their diameter, chirality, number and type of defects, functionalization, residual meta...
متن کاملDegradation of citalopram by simulated sunlight.
Citalopram (CIT), 1-(3-dimethylaminopropyl)-1-(4-fluorophenyl)-5-phthalancarbonitrile, a selective serotonin reuptake inhibitor, is one of the most widely used antidepressants for the treatment of anxiety, obsessional, and control disorders. The degradation of the pharmaceutical CIT hydrogen bromide in water was investigated in the dark and in a growth chamber outfitted with fluorescent lamps s...
متن کاملSunlight and Vitamin D
Vitamin D is the sunshine vitamin that has been produced on this earth for more than 500 million years. During exposure to sunlight 7-dehydrocholesterol in the skin absorbs UV B radiation and is converted to previtamin D3 which in turn isomerizes into vitamin D3. Previtamin D3 and vitamin D3 also absorb UV B radiation and are converted into a variety of photoproducts some of which have unique b...
متن کاملSunlight and skin cancer
It is well known that chronic exposure to ultraviolet (UV) radiation present in sunlight is responsible for the induction of most nonmelanoma skin cancer (NMSC) in humans. Wavelengths in the UV-B (290–320 nm) region of the solar spectrum are absorbed into the skin, producing erythema, burns,and eventually skin cancer.NMSC is themost common type of human cancer. Recent surveys indicate that arou...
متن کاملColor Naming and Sunlight
Lindsey and Brown (2002) proposed an intriguing explanation for the existence and geographical distribution of languages that lack a distinct word for the color blue. Many such languages include blue in a color term that also encompasses green, yielding a green-or-blue (‘‘grue’’) term. Others include blue in a color term that also encompasses dark colors such as black, yielding a black-or-blue ...
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ژورنال
عنوان ژورنال: Nature
سال: 2019
ISSN: 0028-0836,1476-4687
DOI: 10.1038/d41586-019-01767-6