Category Archives: Vitenskap

Mouse cloned from drop of blood

The team, led by Atsuo Ogura, of Riken BioResource Center in Tsukuba, took blood from the tail of a donor mouse, isolated the white blood cells, and used the nuclei for cloning experiments, using the same technique that produced Dolly the sheep in Edinburgh.

The process, known as somatic cell nuclear transfer, involves transferring the nucleus from an adult body cell – such as a blood or skin cell – into an unfertilised egg that has had its nucleus removed.

Via BBC News – Mouse cloned from drop of blood.

The International Linear Collider will be a Higgs factory | Ars Technica

The Large Hadron Collider (LHC) is currently undergoing upgrades that will allow it to finally reach its intended top energy of 14TeV. When it comes back online, researchers will use it to probe the properties of the Higgs boson it discovered and to continue the search for particles beyond those described by the Standard Model. But no matter how many Higgs particles pop out of the machine, there’s a limit to how much we can discover there.

That’s because the hadrons it uses create messy collisions that are hard to characterize. The solution to this is to switch to leptons, a class of particles that includes the familiar electron. Leptons present their own challenges but allow for clean collisions at precise energies, allowing the machine to produce little beyond the intended particles. So now, the international physics community is putting agreements in place that will see a new lepton collider start construction before the decade is out, most likely in Japan.

Via The International Linear Collider will be a Higgs factory | Ars Technica.

Cause of LED efficiency droop finally revealed

Knowledge gained from this study is expected to result in new ways to design LEDs that will have significantly higher light emission efficiencies. LEDs have enormous potential for providing long-lived high quality efficient sources of lighting for residential and commercial applications. The U.S. Department of Energy recently estimated that the widespread replacement of incandescent and fluorescent lights by LEDs in the U.S. could save electricity equal to the total output of fifty 1GW power plants.

http://www.eurekalert.org/pub_releases/2013-04/uoc–col042213.php

Bioengineers Build Open Source Language for Programming Cells | Wired.com

Genes contain information that defines the way our cells function, and some parts of the genome express themselves in much the same way across different types of cells and organisms. This would allow Endy and his team to build a language scientists could use to carefully engineer gene expression – what they call “the layer between the genome and all the dynamic processes of life.”

Via Bioengineers Build Open Source Language for Programming Cells | Wired Enterprise | Wired.com.

Climate science once again finds itself fighting with hockey sticks | Ars Technica

About a month ago, a team of scientists came out with a clearer picture of a story whose rough outlines we already knew. These researchers simply wanted to reconstruct the temperatures that the Earth experienced during the Holocene, the current warm period that started at the end of the last glacial period. Although the new perspective didn’t include anything especially surprising, it set off howls of controversy on the Internet, which reached such intensity that the authors of the research felt they needed to publish an FAQ describing their work in more detail.

Via Climate science once again finds itself fighting with hockey sticks | Ars Technica.

Sam Parnia – the man who could bring you back from the dead | The Observer

Using a technique called an ECMO, the blood of the deceased is siphoned out of the body, put through a membrane oxygenator and pumped round again. This buys the time needed to fix the underlying problem that caused the person to die in the first place. If the level of oxygen to the brain falls below 45% of normal the heart will not restart, Parnia’s research shows. Anything above that and there is a good chance.

Potentially, by this means, dead time can be extended to hours and there are still positive outcomes. “The longest I know of is a Japanese girl I mention in the book,” Parnia says. “She had been dead for more than three hours. And she was resuscitated for six hours. Afterwards, she returned to life perfectly fine and has, I have been told, recently had a baby.”

Via Sam Parnia – the man who could bring you back from the dead | Society | The Observer.