Jumat, 27 Maret 2015

ScienceDaily: Top Science News

ScienceDaily: Top Science News

Earliest humans had diverse range of body types, just as we do today

Posted: 26 Mar 2015 05:46 PM PDT

New research harnessing fragmentary fossils suggests our genus has come in different shapes and sizes since its origins over two million years ago, and adds weight to the idea that humans began to colonize Eurasia while still small and lightweight.

Dark matter even darker than once thought

Posted: 26 Mar 2015 12:22 PM PDT

Astronomers have studied how dark matter in clusters of galaxies behaves when the clusters collide. The results show that dark matter interacts with itself even less than previously thought, and narrows down the options for what this mysterious substance might be.

Designer's toolkit for dynamic DNA nanomachines: Arm-waving nanorobot signals new flexibility in DNA origami

Posted: 26 Mar 2015 12:16 PM PDT

Researchers have demonstrated a new approach to joining -- and reconfiguring -- modular DNA building units, by snapping together complementary shapes instead of zipping together strings of base pairs. This not only opens the way for practical nanomachines with moving parts, but also offers a toolkit that makes it easier to program their self-assembly.

Bats obey 'traffic rules' when foraging for food

Posted: 26 Mar 2015 12:16 PM PDT

Foraging bats obey their own set of 'traffic rules,' chasing, turning and avoiding collisions at high speed according to new research.

Theory of the strong interaction verified: Supercomputer calculates mass difference between neutron and proton

Posted: 26 Mar 2015 12:16 PM PDT

The fact that the neutron is slightly more massive than the proton is the reason why atomic nuclei have exactly those properties that make our world and ultimately our existence possible. Eighty years after the discovery of the neutron, a team of physicists has finally calculated the tiny neutron-proton mass difference. The findings are considered a milestone by many physicists and confirm the theory of the strong interaction.

Antarctic ice shelves rapidly thinning

Posted: 26 Mar 2015 12:14 PM PDT

A new study has revealed that the thickness of Antarctica's floating ice shelves has recently decreased by as much as 18 percent in certain areas over nearly two decades, providing new insights on how the Antarctic ice sheet is responding to climate change.

Ebola whole virus vaccine shown effective, safe in primates

Posted: 26 Mar 2015 12:14 PM PDT

An Ebola whole virus vaccine, constructed using a novel experimental platform, has been shown to effectively protect monkeys exposed to the often fatal virus. It differs from other Ebola vaccines because as an inactivated whole virus vaccine, it primes the host immune system with the full complement of Ebola viral proteins and genes, potentially conferring greater protection.

Chemists make new silicon-based nanomaterials

Posted: 26 Mar 2015 10:10 AM PDT

A new process uses silicon telluride to produce multilayered two-dimensional semiconductor materials in a variety of shapes and orientations.

Crossing fingers can reduce feelings of pain

Posted: 26 Mar 2015 10:08 AM PDT

How you feel pain is affected by where sources of pain are in relation to each other, and so crossing your fingers can change what you feel on a single finger, finds new research. "Many people suffer from chronic pain, and the level of pain experienced can be higher than would be expected from actual tissue damage. Our research is basic laboratory science, but it raises the interesting possibility that pain levels could be manipulated by applying additional stimuli, and by moving one part of the body relative to others," the senior author explained.

High-fat diet alters behavior and produces signs of brain inflammation

Posted: 26 Mar 2015 08:09 AM PDT

Can the consumption of fatty foods change your behavior and your brain? High-fat diets have long been known to increase the risk for medical problems, including heart disease and stroke, but there is growing concern that diets high in fat might also increase the risk for depression and other psychiatric disorders. A new study raises the possibility that a high-fat diet produces changes in health and behavior, in part, by changing the mix of bacteria in the gut, also known as the gut microbiome.

How lifeforms know to be the right size: Fruit fly study reveals new clues

Posted: 26 Mar 2015 05:59 AM PDT

In a new study, scientists are asking how life forms grow to be the correct size with proportional body parts. Probing deeply into genetics and biology at the earliest moments of embryonic development, researchers report that they have found new clues to explain one of nature's biggest mysteries. Their data from fruit flies show the size and patterning accuracy of an embryo depend on the amount of reproductive resources mothers invest in the process before an egg leaves the ovary.

Best view yet of dusty cloud passing galactic center black hole

Posted: 26 Mar 2015 05:59 AM PDT

The best observations so far of the dusty gas cloud G2 confirm that it made its closest approach to the supermassive black hole at the centre of the Milky Way in May 2014 and has survived the experience. The new result shows that the object appears not to have been significantly stretched. It is most likely to be a young star with a massive core that is still accreting material.
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