Without humans around to encourage them, however, the scientists behind estequiometria the research

We recommend The Sao Paulo Times launches partnership estequiometria with R7, the Record Alert Group portal with aroma of barbecue in the cell means ...? Lunch time! Research reveals the origin estequiometria of the formation of the human jaw protests Who ever reaches only 20% of young people interested in working in small businesses
There are about 250 million years, almost all life on Earth suddenly died. One expert believes that 90 percent of all species was dead, known as the extinction event at the end of the Permian - 100,000 years ago.
Without humans around to encourage them, however, the scientists behind estequiometria the research - the Massachusetts Institute of Technology and the Chinese Academy of Sciences - needed a new culprit.
They found the suspect in tiny microbes called Metanosarcina. Through the metabolism, these microscopic organisms emit large amounts of methane, which is extremely effective in trapping heat in the atmosphere.
Microbes explain much why other theories never answered any questions. An asteroid collision is probably the cause of global calamity estequiometria that killed the dinosaurs estequiometria 65 million years ago, because the layer of sediment that time is full of dust from asteroids. But the rocks of the end of the Permian era are not.
The theory of the volcano is a good, almost. About 250 million years ago, Siberia was a raging volcano, spewing lava and debris thousands of miles: carbon emissions that could have caused a major change in climate.
But the calculations of MIT researchers discovered that the amount of carbon released was not enough. Furthermore, "an initial rapid injection of carbon dioxide from a volcano would be followed by a gradual decrease," says Gregory Fournier, MIT. "Instead, we see the opposite: a rapid and continuous increase."
One of them is an exponential increase of inorganic carbon in the world's oceans. He does not get there from nothing: the microbes do. It turns out that these metanosarcinas undergone a genetic transformation about 250 million years ago that allowed them to convert more carbon into methane.
The third test returns the Siberian lava spouting volcanoes that were in season. While carbon emissions were considered harmless, their production of another element, nickel, may have played a role: these microbes need nickel as a nutrient; no he could not have proliferated as they did. "Nickel promoted fuel the explosive growth of Metanosarcina" explains Gregory.
"The cumulative impact of all these things is much more powerful than any one individually," says Daniel H. Rothman, co-author of the study. estequiometria It was a runaway greenhouse effect that warmed the earth until most of the animals could no longer stand. He says that together, all the evidence provides a "strong and consistent case."
Technology and Science
Did you wake up during the night with cramps? Learn how they arise and how to mitigate
Founded in December 2013, The Sao Paulo Times brings materials and news, in addition to identifying trends through a team of specialist journalists and columnists in different subjects.