Among the more peculiar organisms that inhabit our Earth exists a bacterium that turns water-soluble gold into microscopic nuggets of solid gold, scientists said Sunday.

Chemists have often pondered why the germ Delftia acidovorans is frequently found on the surface of tiny gold nuggets.

Its presence led scientists to speculate it may be creating the particles from soluble gold - ions of gold that are dissolved in water.

But the puzzle was how D. acidovorans did this trick, as soluble gold is toxic.

The answer, suggest researchers in Canada, lies in a molecule excreted by the microbe that both shields the organism and transforms the poisonous ions into particles.

"This finding is the first demonstration that a secreted metabolite can protect against toxic gold and cause gold biomineralisation," the process by which living organisms produce minerals, they wrote in the journal Nature Chemical Biology.

The molecule, delftibactin A, is capable of achieving this feat within seconds in pH-neutral conditions at room temperature.

Study co-author Nathan Magarvey of Ontario's McMaster University told AFP the study was not designed to show whether it would be viable to use germs to grow gold from water in the lab.

But such processes seem "distinctly possible," he said in an email exchange.

Previous research had shown that another bacterium found on gold, Ischiadicus metallidurans, deals with toxicity by storing the ions inside its cells.

Bacteria need some metals, such as iron, to grow, whereas others, like silver, will kill them.

Soluble gold, invisible in a glass of water, is found in the ocean, groundwater and other natural water sources.

Solid gold is mainly formed through geological processes in large veins underground.

Magarvey said the study may implicate D. acidovorans in secondary deposits such as nuggets found in rivers.

The bacterium, he added, is not found only on gold but also in the soil and in water. Still unclear, though, is what the organism feeds on.

Source: Agence France-Presse

It means a chemical process can be made to extract gold from seawater.

So maybe one day we can genetically alter a goose to crap gold?

Bacteria need some metals, such as iron, to grow, whereas others, like silver, will kill them.

I find it interesting that silver kills bacteria. That is why "silver ware" was originally made with silver. Eating from a silver spoon protects you from germs.

I wonder if sucking on a silver coin will kill the bacteria in your mouth.

Colloidal silver, a liquid suspension of microscopic silver particles, has historically been ingested to treat a variety of diseases. Its use was largely discontinued in the 1940s, following the development of safer and more effective modern antibiotics.

I wonder if placing a silver coin in water will kill bacteria in the water.

silver is only of the few natural anti-bacterial metals known...silver doesn't really help humans out to much either, it kills the "good bacteria" as well as the bad...

It means a chemical process can be made to extract gold from seawater.

anti-biotics kill good bacteria as well as the bad also.

So maybe one day we can genetically alter a goose to crap gold?

So whats wrong with good old Sodium Cyanide?

hate that Bitter Almond-Smell

I thought that was potassium cyanide.



Huh! I looked it up. They both have the same smell.