Ultraviolet lys: Forskelle mellem versioner
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===UV-strålingens biologiske betydning===
Mange dyr kan se UVA. F.eks. kan [[fugl]]e, [[benfisk]], [[insekt]]er ([[bi]]er), [[reje]]r, [[krabbe]]r<ref>[http://www.halibut.net/What-Fish-See.htm Ultraviolet Light and Its Role in Predation in Fish. How Fool-a-Fish Was Discovered. By Milan Jeckle M. D.] Citat: "...So in summary, I was reading quality scientific research articles that were reporting that ultraviolet [UVA] traveled through [klart] water at least 700 feet [ca. 230 meter] and maybe as much as 2,500 feet [ca. 800 meter] before it was absorbed, unlike visible light which is completely absorbed in the first 40 feet [ca. 12 meter]...The result was the scientific recognition that bony fish and birds have a Rodopsin protein in their retinas which reacts to the ultraviolet wavelengths around 360 nm, a wavelength totally invisible to humans. We also discovered that insects, shrimp and crabs have similar keen ultraviolet vision..."</ref>▼
▲<ref>[http://www.halibut.net/What-Fish-See.htm Ultraviolet Light and Its Role in Predation in Fish. How Fool-a-Fish Was Discovered. By Milan Jeckle M. D.] Citat: "...So in summary, I was reading quality scientific research articles that were reporting that ultraviolet [UVA] traveled through [klart] water at least 700 feet [ca. 230 meter] and maybe as much as 2,500 feet [ca. 800 meter] before it was absorbed, unlike visible light which is completely absorbed in the first 40 feet [ca. 12 meter]...The result was the scientific recognition that bony fish and birds have a Rodopsin protein in their retinas which reacts to the ultraviolet wavelengths around 360 nm, a wavelength totally invisible to humans. We also discovered that insects, shrimp and crabs have similar keen ultraviolet vision..."</ref>
Nogle få [[pattedyr]] - visse nektardrikkende [[flagermus]] - kan se UVA-lys, hvilket gør dem i stand til at finde [[blomst]]er om natten. [[Menneske]]r kan ikke se UVA-lys.
<ref>[http://www.sciencedaily.com/releases/2003/10/031017073642.htm October 17, 2003, ScienceDaily: Bats Scan The Rainforest With UV-Eyes] Citat: "...[[Flagermus|Bats]] from Central and South American that live on the nectar from flowers can see ultraviolet light...Flower visiting bats seem to need UV-vision, because the [[Blomst|flower]]s they visit in the [[regnskov|rainforest]] are characterised by a strong reflection of UV-spectrum light at night. It remains open whether the unusually high UV-sensitivity found in these bats involves a further photo-mechanism that is as yet unknown for mammals..."</ref>
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