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Gut bacteria byproduct protects against Salmonella, study finds

Researchers at the Stanford University School of Medicine have identified a molecule that serves as natural protection against one of the most common intestinal pathogens. Propionate, a byproduct of metabolism by a group of bacteria called the Bacteroides, inhibits the growth of Salmonella in the intestinal tract of mice, according ...

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Study casts doubt on traditional view of pterosaur flight

Most renderings and reconstructions of pterodactyls and other extinct flying reptiles show a flight pose much like that of bats, which fly with their hind limbs splayed wide apart. But a new method for inferring how ancient animals might have moved their joints suggests that pterosaurs probably couldn’t strike that ...

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Mouse study adds to evidence linking gut bacteria and obesity

A new Johns Hopkins study of mice with the rodent equivalent of metabolic syndrome has added to evidence that the intestinal microbiome — a “garden” of bacterial, viral and fungal genes — plays a substantial role in the development of obesity and insulin resistance in mammals, including humans. A report ...

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Farsighted children struggle with attention, study finds

Farsighted preschoolers and kindergartners have a harder time paying attention and that could put them at risk of slipping behind in school, a new study suggests. An estimated 4 to 14 percent of preschoolers have moderate farsightedness, or hyperopia, but it often goes undetected in younger children. When moderate farsightedness ...

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Mars study yields clues to possible cradle of life

The discovery of evidence for ancient sea-floor hydrothermal deposits on Mars identifies an area on the planet that may offer clues about the origin of life on Earth. A recent international report examines observations by NASA’s Mars Reconnaissance Orbiter (MRO) of massive deposits in a basin on southern Mars. The ...

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Humans still evolving, large-scale study of genetic data shows

In a study analyzing the genomes of 210,000 people in the United States and Britain, researchers at Columbia University find that the genetic variants linked to Alzheimer’s disease and heavy smoking are less frequent in people with longer lifespans, suggesting that natural selection is weeding out these unfavorable variants in ...

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