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Continental U. S: Map shows content and origins of the geologic basement

Continental U. S: Map shows content and origins of the geologic basement
Written by Drew Bradley on 2015-04-24


"Traditionally, scientists have assessed mineral resources using clues at or near the Earth's surface to determine what lies below," said USGS scientist Karen Lund, who led the project. "This map is based on the concept that the age and origins of basement rocks influenced the nature and location of mineral deposits. It offers a framework to examine mineral resources and other geologic aspects of...(Read More)

Bacterial flora of remote tribespeople carries antibiotic resistance genes

Bacterial flora of remote tribespeople carries antibiotic resistance genes
Written by Drew Bradley on 2015-04-19


The research stems from the 2009 discovery of a tribe of Yanomami Amerindians in a remote mountainous area in southern Venezuela. Largely because the tribe had been isolated from other societies for more than 11,000 years, its members were found to have among the most diverse collections of bacteria recorded in humans. Within that plethora of bacteria, though, the researchers have identified genes...(Read More)

There is more to a Rembrandt than meets the eye, science shows

There is more to a Rembrandt than meets the eye, science shows
Written by Drew Bradley on 2015-04-14


Rembrandt's oil painting Susanna and the Elders is dated and signed 1647. It hangs in the art museum Gemäldegalerie in Berlin, Germany. The painting contains a considerable amount of the artist's changes or so-called pentimenti (from the Italian verb pentire: ''to repent") underneath the current composition. This was revealed in the 1930s when the first X-ray radiography (XRR) was done on it. More...(Read More)

Greatest mass extinction driven by acidic oceans, study finds

Greatest mass extinction driven by acidic oceans, study finds
Written by Drew Bradley on 2015-04-09


The event, which took place 252 million years ago, wiped out more than 90 per cent of marine species and more than two-thirds of the animals living on land.It happened when Earth's oceans absorbed huge amounts of carbon dioxide from volcanic eruptions, researchers say.This changed the chemical composition of the oceans -- making them more acidic -- with catastrophic consequences for life on Earth,...(Read More)

New evidence shows carbon

New evidence shows carbon's importance to ocean life's survival 252 million years ago
Written by Drew Bradley on 2015-04-04


As the Permian Period of the Paleozoic Era ended and the Triassic Period of the Mesozoic Era began, more than 90 percent of terrestrial and marine species became extinct. Various proposals have been suggested for this extinction event, including extensive volcanic activity, global heating, or even one or more extraterrestrial impacts.The work is explained in the paper, "High influx of carbon in walls...(Read More)

Climate-related disruptions of marine ecosystems: Decades to destroy, millennia to recover

Climate-related disruptions of marine ecosystems: Decades to destroy, millennia to recover
Written by Drew Bradley on 2015-03-30


The scientific collaborative--led by Sarah Moffitt, PhD, from the UC Davis Bodega Marine Laboratory and Coastal and Marine Sciences Institute--analyzed more than 5,400 invertebrate fossils, from sea urchins to clams, within a sediment core from offshore Santa Barbara, California."In this study, we used the past to forecast the future," says Roopnarine, Academy curator of invertebrate zoology and...(Read More)

Did a volcanic cataclysm 40,000 years ago trigger the final demise of the Neanderthals?

Did a volcanic cataclysm 40,000 years ago trigger the final demise of the Neanderthals?
Written by Drew Bradley on 2015-03-23


Black and colleagues write that the CI eruption approximately coincided with the final decline of Neanderthals as well as with dramatic territorial and cultural advances among anatomically modern humans. Because of this, the roles of climate, hominin competition, and volcanic sulfur cooling and acid deposition have been vigorously debated as causes of Neanderthal extinction.They point out, however,...(Read More)

Conifers

Conifers' helicoptering seeds are result of long evolutionary experiment
Written by Drew Bradley on 2015-03-18


The first conifer species that produced seeds that whirl when they fall used a variety of single- and double-winged designs. Whirling, or helicoptering, keeps a seed aloft longer, increasing the chance that a gust of wind will carry a seed to a clearing where it can sprout and grow unimpeded by competitors"Winged seeds may have contributed to the success of these conifers," said paleobotanist Cindy...(Read More)

Humans adapted to living in rainforests much sooner than thought

Humans adapted to living in rainforests much sooner than thought
Written by Drew Bradley on 2015-03-13


This study, published in the early online edition of the journal, Science, shows that early modern humans adapted to living in the rainforest for long periods of time. Previously it was thought that humans did not occupy tropical forests for any length of time until 12,000 years after that date, and that the tropical forests were largely 'pristine', human-free environments until the Early Holocene,...(Read More)





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