Researchers of the ISREC Institute at the School of Life Sciences, EPFL, have deciphered the mechanism whereby some microRNAs are retained in the cell while others are secreted and delivered to neighboring cells.
A new study of colliding galaxy clusters has found that dark matter doesn't even interact with itself.
"We have concluded that dark matter is most probably not interacting, so it exists in its ghostly state without interacting," says the study's lead author Dr David Harvey of the École Polytechnique Fédérale de Lausanne in Switzerland.
"This is surprising because we see in our world that all the particles interact with each other quite highly, whereas dark matter does not seem to do that."
Astronomers first noticed dark matter when they realised that there wasn't sufficient gravitational attraction to keep stars orbiting as fast as they do around the centres of galaxies.
Another apparently invisible substance, which scientists now call dark matter, must be providing the additional gravity.
Scientists estimate that dark matter makes up 85 per cent of all the matter in the universe.
All the normal matter - which makes up all the stars, planets, dust and gas clouds (which scientists call baryonic matter) - makes up just 15 per cent of all the matter in the universe.
Take a look at your body like never before — from the intricate geometry of your hormones to the tiny architecture of the microbes that infect you — in this selection of images from the new book Science is Beautiful.
Here, a colored scanning electron micrograph of empty fat cells. Fat cells, or adipocytes, are amongst the largest cells in the human body. They form a thick insulating layer under the skin which serves to cushion us as well as to store energy.
In this image the normal lipid (fat) deposits of the cells have been removed, revealing the honeycomb structure of the cell membranes.
A team of researchers is exploring new materials that could yield higher computational speeds and lower power consumption, even in harsh environments. Most modern electronic circuitry relies on controlling electronic charge within a circuit, but this control can easily be disrupted in the presence of radiation. Electronics that use spintronics may offer an alternative that is robust even in radiation-filled environments.
Researchers have found an RNA structure-based signal that spans billions of years of evolutionary divergence between different types of cells, according to a new study. The finding could alter the basic understanding of how two distinct life forms -- bacteria and eukaryotes -- begin the process of protein synthesis.
The anatomy of the Milky Way as seen in gamma light is full of mysteries. For example, there are gigantic bubbles of unknown origin above and below the centre of the Milky Way that emit a lot of this high-energy radiation. A new method for imaging, developed at the Max Planck Institute for Astrophysics, now divided the Galactic gamma-radiation into three fundamental components: radiation from point sources, radiation from reactions of energetic protons with dense cold gas clouds, and radiation from electrons scattering light in the thin, hot, Galactic gas. The anatomic insights gained unravel some Galactic mysteries. Thus, it appears that the gamma-ray bubbles are simply outflows of ordinary, hot gas.
Sir Isaac Newton's interest in botany extended well beyond the fabled apple falling from a tree - he also appears to have understood how water moves from roots to leaves over 200 years before botanists did.
Scientists have discovered a new type of hydrogen bond which was previously considered impossible or at least highly improbable.
"The discovery is significant because hydrogen bonds are such a fundamental part of both chemistry and biology," says Professor Henrik Kjærgaard from the Department of Chemistry at the University of Copenhagen. "They form the basis of biological molecules and it’s for instance hydrogen bonds that determine the boiling point of water."
He led the new study, which has been published in the Journal of Physical Chemistry Letters.
Neutrinos are the ninjas of the universe. They don't interact with other particles very often, but when they do, they obliterate them. Until now. Scientists have observed a new way that neutrinos interact with the world.
Why do we continue to detect the cosmic background radiation? Is the fact that we continue to eternally see the cosmic background radiation billions of years after it was generated proof of either inflation, or that the universe must be curved back upon itself (i.e. that it is finite but unbounded)? Or if neither of these are requirements, then what are other explanations?
I want you to think about the history of the Universe.
Scientists from Stanford Medical Center have devised a technique for extending the length of human telomeres. It's a breakthrough that could eventually result in therapies to treat a host of age-related diseases, including heart disease and diabetes. It could also result in longer, healthier lives.
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