science newsletter: Science News SciGuru.com

Πέμπτη 10 Ιανουαρίου 2013

Science News SciGuru.com

Drug-Resistant Melanoma Tumors Shrink When Therapy Is Interrupted
A new algorithm for message dissemination in decentralized networks
How to stop leaks — the way blood does

Drug-Resistant Melanoma Tumors Shrink When Therapy Is Interrupted

Posted: 09 Jan 2013 10:36 AM PST

Researchers in California and Switzerland have discovered that melanomas that develop resistance to the anti-cancer drug vemurafenib (marketed as Zelboraf), also develop addiction to the drug, an observation that may have important implications for the lives of patients with late-stage disease.

A new algorithm for message dissemination in decentralized networks

Posted: 09 Jan 2013 09:42 AM PST

Ad hoc networks — communication networks set up on the fly by mobile sensors — pose problems that ordinary office networks don’t. Ad hoc networks are usually decentralized, meaning that no one node knows what the network as a whole looks like.

How to stop leaks — the way blood does

Posted: 09 Jan 2013 09:36 AM PST

When you get a cut, blood starts to flow from the wound. But very quickly, complex biochemical processes spring into action, creating a scaffolding of molecules to block the hole, and then building up an impervious clot to stanch the flow.

That process relies on a set of molecules that constantly flow through the body’s veins and arteries, just waiting to spring into action when needed. When their job is done, they dissolve back into the blood, awaiting their next repair job.