Sentences with phrase «iron deposits»

The classic model for the formation of iron deposits suggested that the Fe (II) from the Earth's core was oxidized by the oxygen produced by cyanobacteria (blue - green algae).

The Soudan Mine opened in 1884 atop one of the richest iron deposits in the world — hard hematite, about 65 percent pure.

Although no written records exist of the early history of the Phalaborwa district, archaeologists and geologists agree that it was once an area of intense volcanic activity; resulting in rich iron deposits.

Our moon was made by the Big Splash, an impact that we thought left iron deposits near Earth's crust.

However, «the CT scan didn't show the outline of the nervous systems unambiguously enough,» Strausfeld said, «while a scanning laser technique mapping the distribution of chemical elements showed iron deposits outlining the nervous system almost as convincingly but with minor differences.»

But scientists are still debating at what point the Earth's atmosphere contained enough oxygen (produced by cyanobacteria) to allow the formation of big iron deposits.

NASA's Curiosity rover has inspected Gale crater on the Red Planet, revealing rusty oxidised iron deposits at the edges and non-oxidised samples from the middle.

As a result, the woman received more than three times the normal amount of iron supplements her condition required, leaving her with excessive iron deposits in her liver, spleen, and bone marrow.

The team analyzed the fossil by applying different imaging and image processing techniques, taking advantage of iron deposits that had selectively accumulated in the nervous system during fossilization.

Next, the group applied advanced imaging techniques to the scans, first overlaying the magenta color of the iron deposit scan with the green color of the CT scan, then subtracting the two.

The extent to which microbes in the Earth's ancient oceans contributed to the formation of iron deposits was previously unknown.

This research not only provides the first clear evidence that microorganisms were directly involved in the deposition of Earth's oldest iron formations; it also indicates that large populations of oxygen - producing cyanobacteria were at work in the shallow areas of the ancient oceans, while deeper water still reached by the light (the photic zone) tended to be populated by anoxyenic or micro-aerophilic iron - oxidizing bacteria which formed the iron deposits.

«Metal - eating microbes in African lake could solve mystery of the planet's iron deposits.»

In post-mortem brain tissue from people not diagnosed with Alzheimer's, neither the iron deposits nor the scavenger cells engulfing them were present in that brain region.

Long - term iron supplementation has been found in many studies to create oxidative stress in the body as the iron deposits accumulate in the body's tissues and artery walls, potentially leading to atherosclerosis.