Πέμπτη, 22 Μαΐου 2014

ScienceDaily: Top Science News

ScienceDaily: Top Science News


Very distant galaxy cluster confirmed

Posted: 21 May 2014 10:37 AM PDT

The structures and star populations of massive galaxies appear to change as they age, but much about how these galaxies formed and evolved remains mysterious. Many of the oldest and most massive galaxies reside in clusters, enormous structures where numerous galaxies are found concentrated together. Galaxy clusters in the early universe are thought to be key to understanding the lifecycles of old galaxies, but to date astronomers have located only a handful of these rare, distant structures.

Functional nerve cells from skin cells

Posted: 21 May 2014 10:37 AM PDT

Research will make the study of diseases such as Parkinson's and Alzheimer's easier, and could lead to personalized therapies for a variety of neurodegenerative disorders. The nerve cells generated by this new method show the same functional characteristics as the mature cells found in the body, making them much better models for the study of age-related diseases such as Parkinson's and Alzheimer's, and for the testing of new drugs.

A new way to harness waste heat: Electrochemical approach has potential to efficiently turn low-grade heat to electricity

Posted: 21 May 2014 10:36 AM PDT

Vast amounts of excess heat are generated by industrial processes and by electric power plants; researchers around the world have spent decades seeking ways to harness some of this wasted energy. Now researchers have found a new alternative for low-temperature waste-heat conversion into electricity.

Violent stellar explosion: Stellar behemoth self-destructs in a Type IIb supernova

Posted: 21 May 2014 10:35 AM PDT

For the first time, astronomers have direct confirmation that a Wolf-Rayet star -- sitting 360 million light years away -- died in a violent explosion known as a Type IIb supernova. Using the iPTF pipeline, researchers caught supernova SN 2013cu within hours of its explosion.

Iron from melting ice sheets may help buffer global warming

Posted: 21 May 2014 06:49 AM PDT

A newly-discovered source of oceanic bioavailable iron could have a major impact our understanding of marine food chains and global warming. Scientists have discovered that summer meltwaters from ice sheets are rich in iron, which will have important implications on phytoplankton growth.

Shattering past of the 'island of glass': Pantelleria, a little-known island near Sicily, was once covered in a searing-hot layer of green glass

Posted: 21 May 2014 06:47 AM PDT

A tiny Mediterranean island visited by the likes of Madonna, Sting, Julia Roberts and Sharon Stone is now the focus of a ground-breaking study by geologists. Pantelleria, a little-known island between Sicily and Tunisia, is a volcano with a remarkable past: 45 thousand years ago, the entire island was covered in a searing-hot layer of green glass.

E-cigarettes may boost resistance of drug-resistant pathogens

Posted: 19 May 2014 05:45 AM PDT

Despite being touted by their manufacturers as a healthy alternative to cigarettes, e-cigarettes appear in a laboratory study to increase the virulence of drug- resistant and potentially life-threatening bacteria, while decreasing the ability of human cells to kill these bacteria. "The virulence of MRSA is increased by e-cigarette vapor," said the lead investigator. However, she added, the vapor did not make the bacteria as aggressive as cigarette smoke exposure did in parallel studies conducted.

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