Science: The Truth About... Amber
Steve Connor is the Science Editor of The Independent. He has won many awards for his journalism, including five-times winner of the prestigious British science writers’ award; the David Perlman Award of the American Geophysical Union; twice commended as specialist journalist of the year in the UK Press Awards; UK health journalist of the year and a special merit award of the European School of Oncology for his investigative journalism. He has a degree in zoology from the University of Oxford and has a special interest in genetics and medical science, human evolution and origins, climate change and the environment.
Friday 11 September 1998
The decorative qualities of amber have made it a sought-after substance since at least the Bronze Age. Scientists also look upon it as a source of information about the distant past. Although no one has so far extracted dinosaur DNA from an amber-trapped insect, biologists have nevertheless been able to discover intriguing insights into early evolutionary history as a result of studying the imprisoned and often extinct life forms trapped in the fossilised tree resin.
Certain trees exude sticky resin to protect their vulnerable bark against attack. The resin gums up the jaws of tree-eating insects and its antiseptic properties help to kill invading bacteria and fungi.
When bark exudes its resin the sticky blobs can engulf anything they land on, including insects, spiders, flowers, seeds and even small lizards. Its antiseptic nature and lack of water help to prevent the organisms from decaying straightaway. As the volatile components of the resin evaporate, the sticky exudate begins to amberise and dry out, enhancing its preservative qualities.
The organic molecules of the resin form bonds to make bigger molecules, in a process known as polymerisation, which is similar to the chemical reactions resulting in the formation of plastics. Hardened resin, known as copal, gets incorporated into soil and rock and remains around long after the tree dies. Amberisation - when fossilisation is complete - takes a further 2 to 10 million years. The result is a completely inert substance, which can survive intact for hundreds of millions of years.
Dominican amber is the best preservative. The extraction of DNA from amber-trapped insects was first reported in 1992, when scientists claimed to have recovered small stretches of genetic material from a bee in amber.
However, Andrew Ross, curator of fossil arthropods at the Natural History Museum in London, who has just published a booklet on amber, has failed to repeat the DNA-extraction experiments, which casts doubt on whether the DNA really was from an ancient insect, or whether it was the result of laboratory contamination.
As for the idea of ever extracting dinosaur DNA from a trapped mosquito, Dr Ross is even more sceptical. "Even if DNA could be extracted from insects in amber, a real-life Jurassic Park is not possible. There are many reasons why such a venture will remain fiction. First, there are no known insect- bearing Jurassic ambers. Second, contrary to popular belief, mosquitoes are extremely rare in amber."
Steven Spielberg, please note.
`Amber: The Natural Time Capsule', published by the Natural History Museum, pounds 7.95
Arts & Ents blogs
- 1 Drugs Live cannabis trial: Hash is less harmful than any other drug, expert claims
- 2 What happens to your body when you give up sugar?
- 3 Turkish Airlines flight TK 726 crash-lands on Nepal runway in dense fog
- 4 Have sex with your iPad thanks to the new sex toy no-one asked for
- 5 The 'sex selfie stick' lets you FaceTime the inside of a vagina
The Great Comic Relief Bake Off, TV review: Alexa Chung impresses, but Chris Moyles makes Paul Hollywood gag
Drugs Live: Twitter responds to Jon Snow and Jennie Bond smoking cannabis
Seth Rogan's pot fumes delay hacked Sony boss’s office move
India's Daughter: BBC Four documentary provokes outrage on Twitter
Fifty Shades of Grey movie shows first sex scene 'after 40 minutes'
Durham Free School: 'Creationism taught at' free school facing closure
Nearly 100,000 of Britain's poorest children go hungry after parents' benefits are cut
Ukip would cut billions from Scottish budget to fund English tax cuts
End of the licence fee: BBC to back radical overhaul of how it is funded
Ukraine crisis: Top Chinese diplomat backs Putin and says West should 'abandon zero-sum mentality'
Boris Nemtsov shot dead: Outspoken Putin critic who had expressed fears for his life is killed near the Kremlin