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2017年05月29日 04:17:31来源:兰州晨报

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  • The researchers characterized the crawling motion further using both X-ray and visible-light videos. Those videos showed that, at the start of each crawl, the gut in the insects' midbody segments moved in advance of the body wall and before the attached limbs, known as prolegs(腹足) , swung. ;The midgut typically advanced an entire step forward before the body wall caught up,; the researchers report. In fact, the gut lurches forward and then falls back in what they describe as a pistoning(活塞) motion.
  • In their analysis of five-year cancer survival, the researchers adjusted for age, year of diagnosis and tumor stage and grade, when this information was available. Cook and his team found that a person's gender did not play a major role in cancer survival.
  • ;This is an astonishing increase in such a short period, just 1 percent of the current age of the universe,; he said.
  • Then in the summer of 2009, the Ngogo chimpanzees began to use the area where two-thirds of these events occurred, expanding their territory by 22 percent. They traveled, socialized and fed on their favorite fruits in the new region.
  • The experiment used the well-known fact that babies' gaze can tell you a lot about how they perceive things. In this case, the researchers watched for distinctions between familiar and novel movements. As expected, the babies looked significantly longer at the familiar videos -- that is, the events that followed the statistical probabilities they'd learned -- than at the re-spliced sequences.
  • What's the big deal?
  • They estimate that the films would improve the annual efficiency of solar cells by 6 percent in Phoenix and by 5 percent in Tokyo.
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