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Thursday, January 5, 2012
The Best Affordable Pro Compact Camera [Battlemodo]
Microbes Make Some People Smell Delicious To Mosquitoes
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Mosquitoes prefer the smell of skin with more abundant--but less diverse--bacterial communities. Sophie Bushwick reports.
January 3, 2012?|
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Ever wondered why mosquitoes eat some people up but leave others relatively unscathed? A new study finds that this preferential treatment is due to the smells produced by the microscopic critters that cover our bodies. The research is in the journal Public Library of Science ONE. [Niels O. Verhulst et al, Composition of Human Skin Microbiota Affects Attractiveness to Malaria Mosquitoes]
To a mosquito, every human has a particular smell. And the differences are due in part to the particular bacteria on each individual?s skin.
The study tested the malaria-transmitting Anopheles gambiae mosquito?s attraction to the odors of 50 adult men. The participants avoided items, such as garlic, that would change their natural smell.
Researchers collected the male scents by rubbing glass beads on the bottom of each participant?s foot, and swabbed the same skin for microbes. And they discovered that mosquitoes preferred the smell of skin with more abundant?but less diverse?bacterial communities.
The scientists suggest that the diverse communities may include some microbes that produce compounds mosquitoes naturally dislike. If further research can identify these compounds, it could lead to the development of repellents to make bloodthirsty mosquitoes buzz off.
?Sophie Bushwick
[The above text is a transcript of this podcast]
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Tuesday, January 3, 2012
DeMarcus Cousins Demands Trade: Kings Coach Criticizes Center's Commitment
SACRAMENTO, Calif. (AP) -- The Sacramento Kings and DeMarcus Cousins abruptly began to sever ties Sunday after the team said the promising young center demanded a trade.
Kings coach Paul Westphal released a statement before Sacramento hosted the New Orleans Hornets, criticizing Cousins' commitment to the franchise and excusing him from the team's game. He also confirmed that Cousins asked for a trade.
"Whenever a new season begins, in any sport, there is great hope that everything will progress in only a steady, upward direction," Westphal said. "As we all know, it seldom happens like that in this life! As coaches, we can only ask that our players do everything they can to improve themselves as individuals and teammates. If they do this with all their hearts, we live with the results.
"Everything that happens on a team does not become known to the public," Westphal continued. "This is how it should be. However, when a player continually, aggressively, lets it be known that he is unwilling/unable to embrace traveling in the same direction as his team, it cannot be ignored indefinitely.
"DeMarcus Cousins has demanded to be traded. In the best interest of our team as we go forward, he has been directed by me, with the support of management, to stay home from the New Orleans game tonight."
When reached by phone, Cousins' agent, John Greig, said he wasn't informed of the Kings' decision until Westphal's announcement. He declined comment when asked if Cousins requested a trade.
"I have no idea what the Kings are doing," Greig said. "The fact that I'm just finding out about this announcement now speaks volumes about them."
The Kings had been expecting big things from Cousins this season.
They had been optimistic that he would show improved maturity after a strong rookie campaign that also had its share of temper tantrums and blow-ups. While the comical Cousins off the court never disappeared, the team expected its up-and-coming big man would learn to control his emotions.
Sacramento drafted Cousins with the fifth overall pick in 2010 after he spent one season at Kentucky. The 21-year-old Cousins was averaging 13 points and 11 rebounds in 27 minutes per game this season.
Cousins' behavior has been well documented going back to high school and his one season at Kentucky, mixing in dramatic and astonishing plays with outbursts against players, coaches, trainers and referees. His conditioning has been questioned and so has his work ethic, however, he showed up for training camp in prime condition and appeared ready for a breakout season.
Teamed with 2009-10 Rookie of the Year Tyreke Evans, Cousins was expected to anchor the frontline for a young and emerging roster in the deep Western Conference. Sacramento finished 24-58 last season and missed the playoffs for the fifth straight year, although a late-season surge behind a healthy Evans provided hope that maybe the Kings aren't that far off from making the postseason again.
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Three days out from Iowa caucuses: The Des Moines Register poll cometh (Washington Post)
Monday, January 2, 2012
Forest fire cuts across vast Chilean national park (AP)
SANTIAGO, Chile ? Chilean President Sebastian Pinera says an out-of-control fire has already burned 32 square miles (8,500 hectares) of a national park in the nation's south, and it has prompted the evacuation of 400 tourists.
The president interrupted a summer vacation to meet with top aides on Friday about how to respond to the conflagration at the Torres del Paine National Park, which receives tens of thousands of foreign visitors each year.
He says "the terrain in the area is extraordinarily rough and that enormously complicates access and work." Gusts as strong as 70 mph (120 kph) also have fanned the fire.
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Sunday, January 1, 2012
Graphene gives protection from intense laser pulses
ScienceDaily (Dec. 30, 2011) ? Scientists at the National University of Singapore (NUS) , DSO National Laboratories and University of Cambridge have jointly announced a new world record in broadband non-linear optical absorption behavior using single-sheet graphene dispersions in a variety of heavy-atom solvents and film matrices.
Graphenes are single sheets of carbon atoms bonded into a hexagonal array. In nature, they tend to stack to give graphite. In this breakthrough, the scientists have developed a way to prevent the restacking of these sheets by attaching alkyl surface chains to them, while retaining the integrity of the nano-graphene pockets on the sheets. This makes a solution-processable material that can be dispersed into solvents and also into film matrices. As a consequence, the scientists observed a new phenomenon. They found that the dispersed graphenes exhibit a giant nonlinear optical-absorption response to intense nanosecond laser pulses over a wide spectral range with a threshold that is much lower than found in any material.
This sets a new world record in energy limiting onset of 10 mJ/cm^2 for a linear transmittance of 70%.
These materials can now be used for protection of sensitive sensors and devices from laser damage, and for optical circuits.
"We found from ultrafast spectroscopy measurements that dispersed graphene sheets switch their behavior from induced optical transparency which has been well known, to induced optical absorption depending on its environment. This is a remarkable finding that shows graphene can still surprise!" says Prof Lay-Lay Chua, principal investigator of the ONDL graphene team at NUS.
"This is an important first step in the development of practical graphene nanocomposite films for applications where the graphene sheets remain fully dispersed. The induced change in their nonlinear optical behavior is amazing and highly practical!" says Prof Geok-Kieng Lim, principal investigator of the DSO graphene team. Prof Geok-Kieng Lim is also an adjunct professor at the Department of Physics, NUS.
The work at University of Cambridge was performed at the Cavendish Laboratory in the group of Prof Sir Richard Friend, who is also the Tan Chin Tuan Foundation Centennial Professor of NUS. The work in Singapore is supported by the Temasek Young Investigator's Award, NUS-DSO Project Agreement and Ministry of Education.
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The above story is reprinted from materials provided by National University of Singapore.
Note: Materials may be edited for content and length. For further information, please contact the source cited above.
Journal Reference:
- Geok-Kieng Lim, Zhi-Li Chen, Jenny Clark, Roland G. S. Goh, Wee-Hao Ng, Hong-Wee Tan, Richard H. Friend, Peter K. H. Ho, Lay-Lay Chua. Giant broadband nonlinear optical absorption response in dispersed graphene single sheets. Nature Photonics, 2011; 5 (9): 554 DOI: 10.1038/nphoton.2011.177
Note: If no author is given, the source is cited instead.
Disclaimer: Views expressed in this article do not necessarily reflect those of ScienceDaily or its staff.
Source: http://feeds.sciencedaily.com/~r/sciencedaily/~3/1SEvkv_o0jM/111230134831.htm
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