Menu
Blog scientist
Oceans on brink of mass extinction: study
Brain exercises delay mental decline
Meaning of life changes across cosmos
Ancient Nubians drank antibiotic beer
First mission to touch the Sun
There's gold in them thar bacteria!
Low vitamin D linked to schizophrenia
Weight loss may be toxic: study
Pilbara find points to earliest life
Researchers uncover dance moves to impress
Visual trickery key to luring lover
Scientists find short-sightedness gene
Artificial 'skin' can sense pressure
Study confirms antibiotics mess with gut
Phone chatter could power mobiles
Stowaways found hitching ride on seaweed
Fishing could feed millions more: report
Amateurs make an astronomical impact
Study reveals new piece in autism puzzle
Genome map may help devil fight cancer
Report says ozone layer depletion stopped
Moon's surface at saturation point
Gene sweeps nets female cancer clues
Australia birthplace of astronomy: study
There's gold in them thar bacteria!
Gold nuggets are often the creations of bacterial biofilms, say Australian researchers who have demonstrated the process and even identified the bacteria at work.

Layers of bacteria can actually dissolve gold into nanoparticles, which move through rocks and soils, and then deposit it in other places, sometimes creating purer 'secondary' gold deposits in cracks and crevices of rocks.

The process overturns the long-held belief by some scientists that gold ore is created only by 'primary' physical geological processes.

By looking at the DNA in biofilms that grow on gold grains collected from the Prophet gold mine in southeast Queensland, Australia , the University of Adelaide's Frank Reith and his colleagues discovered that 90% of the bacteria were of just two species Delftia acidovorans and Cupriavidus metallidurans. The bacteria share genes that make them resistant to the toxic effects of heavy metals.

"It's the first time we actually see the mechanism laying on top of the gold grain," said Joël Brugger of the South Australian Museum and University of Adelaide, a co-author on a report about the discovery which appears in this month's Geology.

"We tagged the DNA and saw the beautiful active biofilm (dissolving the gold)," says Brugger. "That was very interesting because gold in soluble form is very toxic." That dissolved gold can then be redeposited in other places in a much purer form.
New techniques

The discovery is especially important because it could point to a new high-tech way to prospect for gold.

"[We've] been looking for gold in Australia for a hundred years," says Brugger. "It's getting more and more difficult." In fact most of the gold mining activity is just extensions of old discoveries made decades ago. "Finding something new is really, really rare."

One thing that makes it particularly hard to find new gold deposits in southeast Queensland is that the rocks there, and over most of Australia, are some of the oldest on Earth and have been largely ground down and buried by many metres of soil.

Finding gold deposits has often meant chancing upon the element on or near the surface soil, then digging down in search of ore-bearing rocks. Sometimes that has worked, sometimes not, says Brugger.

"At the moment we don't really understand how gold moves around in the environment," says Brugger. "I think that here we can see for the first time how it happens."

Microbes dissolve it and move it around with the groundwater flow which can be pretty quick.

The presence of the bacteria could be a quick way to test if gold is present in the ground, Brugger suggests. Field geologists could even someday use biosensors that are tuned to detect the genes of these gold-specific microbes.

"It may have a direct application in understanding how gold is going to exist in these environments," agrees geochemist DC "Bear" McPhail of Australian National University.

McPhail is looking at how microbes might alter the concentrations of different uranium isotopes, also a toxic metal, in soils, which can affect radioisotope dating techniques.

"We still have some way to go until we have direct application," says McPhail. "But it may lead to looking in different parts of the soil. It gets more and more sophisticated all the time."

Print
Census charts world beneath the seas
Wonder carbon nets pair Nobel Physics Prize
Focus on chest for CPR: study
Bull ants have right eye for the job
Carbon chemistry pioneers share prize
Ancient galaxies found in modern universe
Solar surprise for climate models
Study predicts end of world as we know it
Rare plant has biggest genome yet found
Astronomers find long-lost lunar rover
Flight paths may be bad for the heart
Complex Haitian quake triggered tsunamis
US doctors usher in 'dawn of stem cell age'
Changing demographics impact CO2 levels
Sleeping in lit room leads to weight gain
Harsh conditions create sterile workers
Study finds pigeons love a flutter
Humpback whale beats long-distance record
Survey to dive deep into Australian waters
Bad jobs affect mental health
Hubble captures suspected asteroid crash
Mysterious pulsar has astronomers in a spin
Native rice may hold key to food future
Future LEDs may be what the doctor orders
Bilingualism good for the brain
Organ consent needs thought transplant
Cavemen ground flour, prepped veggies
Fossilised iceblocks shed light on early life
Menu
Water on Moon bad news for astronomy
Human eye evolved to see dark world
Wind could have parted sea for Moses
CERN scientists spot potential discovery
Malaria crossed to humans from gorillas
Horny find uncovers Triceratops' predecessor
Time passes quicker for high flyers
Da Vinci's ornithopter takes flight
Software smart bomb aimed at Iran: experts
High oestrogen levels may impact brain
Quantum leap towards computer of the future
Study finds predictive power of search
Cardio routine can nurture sweet dreams
Restored Apollo 11 footage to be screened
'Extinct' animals back from the dead
Astronomers find home away from home
Study locates our sense of direction
Records reveal First Fleet's wet welcome
Dinosaurs taller thanks to thick cartilage
Free mammograms 'should start at 40'
Grunting slows opponent's reaction time
Colour preferences shaped by experience
Father of IVF wins Nobel prize
Happiness more than gene deep
Visit Statistics
http://google.com/

http://bing.com/

https://gepatit-info.top/

https://serdechnic.com/

https://buy-meds24.com/

https://dverirespekt.ru/

https://www.sribno.net/

https://undergroundcityphoto.com/

https://detskiezabolevaniya.com/

http://grafaman.ru/

http://innoslicon.com/html/product/index.htm

https://yginekologa.com/

https://yes-com.com/

https://www.baikaleminer.com/

https://bitmaein.com/shop

https://www.artdeko.info/

https://aerodizain.com/

http://xn--d1abj0abs9d.in.ua/

http://lider82.ru/

http://sta-grand.ru/

http://snabs.kz/

https://sky-mine.ru/

https://rybalka-opt.ru/

http://snegozaderzhatel.ru/

https://xn--e1aaajzchnkg.ru.com/

http://hit-kino.ru/

http://www.regionshop.biz/

https://xn--80aaafbn2bc2ahdfrfkln6l.xn--p1ai/

https://pp-budpostach.com.ua/

https://vykup-avto-krasnodar.ru/

https://gcup.ru/

https://mega-polis.biz.ua/

http://vanrise.com.ua/

http://infra-e.ru/

https://veterinariya.com/

https://ponosanet.com/

https://cariestop.com/

https://proartrit.com/

https://elonm.ru/

https://nakozhe.com/

https://spinanebolit.com/

http://zameskino.ru/

http://kinoprinc.ru/

http://pospektr.ru/

http://buypillsonline24h.com/

http://komputers-best.ru/

https://komp-pomosch.ru/