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Australian Nanotechnology: UNSW Single Atom Transistor

Posted: February 21st, 2012 | Author: | Filed under: Applied Science, Nonotechnology, Physics, STANDOUT, Technoid | Tags: , , , , , , , , , , | Comments Off on Australian Nanotechnology: UNSW Single Atom Transistor

Single Atom Quantum Image via UNSWAn Australian team of physicists have created the world’s first – and smallest – functioning single-atom transistor, which could prove a critical building block toward the development of super-fast computers. In what can only be described as nanotechnology at it’s purest – the ability to control matter at the atomic scale, build devices with atomic precision, is the central definition of nanotechnology. Though several groups have attempted this amazing feat before, never has it been accomplished with such puristic accuracy. As if nonotechnology wasn’t already übercool: The transistor itself is composed of a single phosphorous-31 isotope, which has been precisely placed on a base of silicon using a Scanning Tunneling Microscope in an ultra-high vacuum chamber. What’s particularly amazing about their technique is that they were able to position the individual phosphorous atoms precisely.

The Australian teams tiny electronic device – described in a paper published in the journal Nature Nanotechnology – uses as its active component an individual phosphorus atom patterned between atomic-scale electrodes and electrostatic control gates. The Nanotechnology paper elegantly describes a brilliant process: Researchers fabricated a single-atom transistor in which a single phosphorus atom is positioned between highly doped source and drain leads with a lateral spatial accuracy of ±1 atomic lattice spacing. researchers demonstrate that they were able to register source, drain and gate contacts to the individual donor atom and observe well-controlled transitions for 0, 1 and 2 electron states, in agreement with atomistic modelling of the device. What was also amazing said Dr Fuechsle was that the electronic characteristics exactly matched theoretical predictions undertaken with Professor Gerhard Klimeck’s group – using NEMO-3D, a Nanoelectronic Modeling tool – at Purdue University in the US and Professor Hollenberg’s group at the University of Melbourne.  Read the full article »»»»

Australian Psychiatrists Embroiled in Conflict-of-interest Row

Posted: February 13th, 2012 | Author: | Filed under: Applied Science, Cankler Science News, Medicated, STANDOUT | Tags: , , , , , , , , , , , | Comments Off on Australian Psychiatrists Embroiled in Conflict-of-interest Row

Australian Psychiatrists Embroiled in Conflict-of-interest Row - ValdoxanSeveral conspicuous academics have sent letters to prestigious British medical journal The Lancet, claiming prominent psychiatric Professor Ian Hickie had a serious conflict of interest in his review of a new drug, Valdoxan. Professor Hickie, who is from Sydney’s Brain and Mind Institute and one of eight new national mental health commissioners, says he is the victim of a campaign to discredit his work.

Hickie has also been accused of down playing the side effects of Valdoxan, an antidepressant marketed for the treatment of major depressive disorder. So far six letters, in response to the Hickie review, have been published in The Lancet, all of which are critical. Hickie and his co-author Naomi Rogers have both replied to the criticism.

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Chronic Fatigue Virus Dismissed

Posted: December 22nd, 2011 | Author: | Filed under: Cankler Science News, Medicated | Tags: , , , , , , , , | Comments Off on Chronic Fatigue Virus Dismissed

Chronic Fatigue Virus XMRV DismissedThe theory that chronic fatigue syndrome is caused by a virus has been killed off. It is just two years since researchers gave hope to sufferers that a cure may be on the horizon. In late December 2011 two of the global giants of science publishing from the United States, Science and Proceedings of the National Academy of Science, withdrew published papers which claimed sufferers carried a virus. Over the past three decades chronic fatigue syndrome (CFS), or myalgic encephalomyelitis (ME), has lost the dismissive tag of “yuppie disease” and is no longer thought to be only a psychiatric condition. It may affect 17 million people around the world, but there is no agreed cause or cure. Yet the studies caused blood banks, including the Red Cross, to ban blood donations from people who had suffered CFS. A medical science professor at the University of New South Wales, Andrew Lloyd, says fundamental steps to good science and clinical care were by-passed. He says it is understandable that CFS sufferers jump on any new discovery.

The prominent journal Science has retracted a 2009 report linking a mouse retrovirus to chronic fatigue syndrome after it was disproved by researchers earlier this year. The 2009 study led by Dr Judy Mikovits, the director of the Whittemore Peterson Institute, found that the retrovirus XMRV was frequently present in the blood of chronic fatigue sufferers, without establishing a causal link. The Journal Science said it had “lost confidence in the report and the validity of its conclusions” after multiple laboratories, including those of the original authors, failed to detect the virus in chronic fatigue patients.

The journal said most of the authors had agreed in principle to retract the report but were unable to agree on the precise wording. “It is Science’s opinion that a retraction signed by all the authors is unlikely to be forthcoming. We are therefore editorially retracting the report. “We regret the time and resources devoted to unsuccessful attempts to replicate these results,” it added.The study had been hailed as a breakthrough for the estimated one to four million Americans who suffer from the elusive but debilitating illness, and led to many being treated with antiretroviral drugs used against HIV/AIDS. Read the full article »»»»

Sexually Transmitted Infections Epidemic: Is Sex Education the Answer?

Posted: December 1st, 2011 | Author: | Filed under: Love and Other Drugs, Medicated, Science, Science News | Tags: , , , , , , , , , , , , , | Comments Off on Sexually Transmitted Infections Epidemic: Is Sex Education the Answer?

A community based sexual health group has raised the alarm about the level of risky sexual behaviour among young people, saying ignorance on the subject could make young Australians vulnerable to HIV/AIDS. Alischa Ross, the founder of Youth Empowerment Against HIV AIDS – YEAH – says her group sends volunteers into schools and public events such as music festivals to educate young people about safe sex. There has been a 20 per cent increase in the rate of infection among young people in the last three years, with chlamydia and gonorrhoea among the biggest culprits. Ms Ross says the trend points to more risky behaviour and widespread complacency. Ross says although HIV is not a huge problem in Australia, it will become more of an issue in the near future, looking at the trends of HIV and what we’ve seen happen worldwide for the last 30 years, is that where there are high incidents of Sexually Transmitted Infections, HIV follows D★D  READ MORE