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The Hayflick Limit: why humans can't live forever1 month ago in Genomics, Medicine, and Pseudoscience
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Course Corrections4 months ago in Angry by Choice
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The Site is Dead, Long Live the Site2 years ago in Catalogue of Organisms
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The Site is Dead, Long Live the Site2 years ago in Variety of Life
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Does mathematics carry human biases?3 years ago in PLEKTIX
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A New Placodont from the Late Triassic of China5 years ago in Chinleana
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Posted: July 22, 2018 at 03:03PM6 years ago in Field Notes
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Bryophyte Herbarium Survey6 years ago in Moss Plants and More
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Harnessing innate immunity to cure HIV8 years ago in Rule of 6ix
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WE MOVED!8 years ago in Games with Words
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post doc job opportunity on ribosome biochemistry!9 years ago in Protein Evolution and Other Musings
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Growing the kidney: re-blogged from Science Bitez9 years ago in The View from a Microbiologist
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Blogging Microbes- Communicating Microbiology to Netizens10 years ago in Memoirs of a Defective Brain
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The Lure of the Obscure? Guest Post by Frank Stahl12 years ago in Sex, Genes & Evolution
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Lab Rat Moving House13 years ago in Life of a Lab Rat
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Goodbye FoS, thanks for all the laughs13 years ago in Disease Prone
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Slideshow of NASA's Stardust-NExT Mission Comet Tempel 1 Flyby13 years ago in The Large Picture Blog
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in The Biology Files
The Who, What, When, Where and Why of Chemistry
Chemistry is not a world unto itself. It is woven firmly into the fabric of the rest of the world, and various fields, from literature to archeology, thread their way through the chemist's text.
Will bromine turn squirrels purple?
Most winters Punxatawney Phil is the furry face of Pennsylvania, but last year, he had competition: meet the purple squirrel of Jersey Shore (which should not be confused with either a television show or a town in New Jersey).
The news report offers a number of theories about the squirrel's unique coloration. A dye job seems the likely culprit, whether from the squirrel's nesting material or an inadvertent bath in a violet solution. Computer scientist Krish Pillai had a novel suggestion: "This is not good at all. That color looks very much like Tyrian purple. It is a natural organobromide compound seen in molluscs and rarely found in land animals. The squirrel (possibly) has too much bromide in its system."
Leaving aside that Tyrian purple (produced by a particular class of marine snail and to the best of my knowledge and research abilities by no mammal) is a much redder color, this assertion is roughly equivalent to saying that if I eat too much chloride, say from table salt, my body could start synthesizing Splenda, an organochloride. No, just, no.
Pillai is apparently extrapolating from reports that bromide (bromine anion - Br-) has been found contaminating wells near fracking sites. Calcium bromide is used in drilling fluids to increase density, by some estimates 20% of the bromine used in the US ends up in "clear brine fluids" — mixtures of various bromides. But it is a long way from bromine ions to 6,6′-dibromoindigo along very specific biochemical pathways. Which squirrels don't have. Or humans. (What can and does happen is that the bromide reacts with various chlorine compounds used in water purification to form organohalides, which aren't healthy to ingest....)
It's worth noting that direct ingestion of dyes can have interesting effects on pigmentation. Flamingos get their characteristic color from ingesting shrimp pigment, and you can change the color of a canary's feathers by feeding it paprika. Humans who eat too many carrots can develop carotenemia — they turn orange. These processes are reversible, stop eating the shrimp or carrots and feather or skin return to their normal coloration. Unfortunately consuming silver or gold can produce a permanent change in skin coloration, as in argyria.
An alternate definition of a purple squirrel via Urban Dictionary.
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