Bug protects itself by turning its environment to gold

Mythical King Midas was ultimately doomed because everything he touched turned to gold. Now, the reverse has been found in bacteria that owe their survival to a natural Midas touch.

Delftia acidovorans lives in sticky biofilms that form on top of gold deposits, but exposure to dissolved gold ions can kill it. That's because although metallic gold is unreactive, the ions are toxic.

To protect itself, the bacterium has evolved a chemical that detoxifies gold ions by turning them into harmless gold nanoparticles. These accumulate safely outside the bacterial cells.

"This could have potential for gold extraction," says Nathan Magarvey of McMaster University in Hamilton, Ontario, who led the team that uncovered the bugs' protective trick. "You could use the bug, or the molecules they secrete."

He says the discovery could be used to dissolve gold out of water carrying it, or to design sensors that would identify gold-rich streams and rivers.

The protective chemical is a protein dubbed delftibactin A. The bugs secrete it into the surroundings when they sense gold ions, and it chemically changes the ions into particles of gold 25 to 50 nanometres across. The particles accumulate wherever the bugs grow, creating patches of gold.

Deep purple gold

But don't go scanning streams for golden shimmers: the nanoparticle patches do not reflect light in the same way as bigger chunks of the metal – giving them a deep purple colour.

When Magarvey deliberately snipped out the gene that makes delftibactin A, the bacteria died or struggled to survive exposure to gold chloride. Adding the protein to the petri dish rescued them.

The bacterium Magarvey investigated is one of two species that thrive on gold, both identified a decade or so ago by Frank Reith of the University of Adelaide in Australia. In 2009 Reith discovered that the other species, Cupriavidus metallidurans, survives using the slightly riskier strategy of changing gold ions into gold inside its cells.

"If delftibactin is selective for gold, it might be useful for gold recovery or as a biosensor," says Reith. "But how much dissolved gold is out there is difficult to say."

Journal reference: Nature Chemical Biology, DOI: 10.1038/NCHEMBIO.1179

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MPs call for ways to avoid 6.9m-strong population

SINGAPORE: Some 60 Members of Parliament (MPs) have indicated their interest to take part in the debate on the White Paper on Population.

There were several references to the much-talked-about population number, which the government is using to prepare infrastructure plans.

There were calls to find ways to avoid the need to grow Singapore's population to 6.9 million people.

Suggestions included improving work-life balance and providing more incentives for Singaporeans to have children.

Seah Kian Peng, MP for Marine Parade Group Representation Constituency said: "We do need to do more to have more citizens, not just by getting new citizens in but also by getting our people to get married. And getting our married couples to have more babies. Singaporeans ourselves can and must respond and answer to this call too.

"At the same time can we moderate the flow of immigration as we strive to grow our citizen population? Only within these figures can the notion of maintaining a strong Singapore core make sense. At the same time, we need to continually review and continually enhance the privileges of being a Singapore citizen. This must be on government's radar screen all the time."

Foo Mee Har, MP for West Coast GRC suggested: "I would like to call for urgent action to ensure a stronger Singaporean core in our population strategy. I offer two priorities for the Deputy Prime Minister's consideration so that we don't arrive at 6.9 million - Take bolder steps to improve total fertility rate, tap our own talent pool, especially amongst economically inactive women and older workers."

"There is a national anxiety and some angst, but instead of letting out this national moan about the projected population numbers, there should be a national vigour to address the vulnerabilities of Singapore," said Arthur Fong, MP for West Coast GRC.

"Perhaps then, we might look at the numbers needed with more objectivity and a renewed urgency to move forward on borrowed time. Our future rests with the three keys that the White Paper has stated, that the heart of our nation is represented by our Singaporean core. I would like to say that for a strong Singapore and a cohesive society, we need a strong heart and better yet, a big heart."

There were also concerns that augmenting the Singapore population with new citizens and permanent residents would dilute the Singaporean identity.

Christopher de Souza, MP for Holland-Bukit Timah GRC said: "Singaporeans must be the key ingredient to how Singapore is portrayed to and understood by the rest of the world. This responsibility and privilege must be accorded to Singaporeans, with PRs and residents playing a complementary role. Every few years, Singaporeans must be able to look back and say 'My life, my family's life has improved, there is a happy future for us.'"

MP for Aljunied GRC Sylvia Lim said also expressed concerns about a dilution of the Singaporean identity.

She said a strong Singaporean core must be strongly Singaporean in values, culture and sense of history, and should be made up of Singaporeans who grew up in Singapore.

The opposition MP said the Workers' Party is opposing the White Paper on Population and proposed that Singapore entertain the idea of a more modest GDP growth rate which will see a population of 5.9 million or less in 2030.

Ms Lim said this can be achieved if Singapore works towards a GDP growth of 2.5 per cent to 3.5 per cent per year up to 2020. And from 2020 to 2030, 1.5 per cent to 2.5 per cent per year.

"This trade off will mean less overcrowding, better integration of newcomers, a stronger Singaporean identity, and less stressful labour market competition. This is turn is likely to have knock-on effects on total fertility rate recovery.

"It will also not be at the expense of market competitiveness, as our economy continues to restructure, to push the proportions of Singaporeans in PMET jobs from half to two thirds. The road map proposed in the White Paper will further dilute our national identity. It will also place us on a course towards needing even larger population injections in the future, which we do not believe is sustainable."

- CNA/xq

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HP Chromebook shows 'multi-OS approach'

HP's Pavilion 14 Chromebook

(Credit:
Hewlett-Packard)

Moving its PC line beyond Microsoft's Windows operating system by embracing Google's Chrome OS, Hewlett-Packard today announced the $330 Pavilion 14 Chromebook.

Samsung and Acer were the first to offer Chrome OS devices, with Lenovo following suit. Now HP evidently believes it's worth jumping on the bandwagon for the browser-based operating system, describing the Chromebook as part of its "multi-OS approach."

"Google's Chrome OS is showing great appeal to a growing customer base," said Kevin Frost, general manager of HP's Consumer PC, Printing, and Personal Systems group. "With HP's Chromebook, customers can get the best of the Google experience on a full-sized laptop, all backed up by our service and brand."

Microsoft has retained its cloud in the PC market despite allies dalliances before. Dell, for example, gave the Ubuntu version of Linux an endorsement and sales channel for years. What's different now is that Microsoft, along with traditional PC allies such as Dell and HP, has been struggling to grapple with the arrival of smartphones and
tablets beyond the traditional PC market.

The Pavilion 14 has unspectacular hardware -- specifications that emerged last week in a spec sheet on HP's Web site -- but HP is trying to separate it from the competition by touting its larger 14-inch display.

It uses a 1.1GHz Intel Celeron 847 processor, a 16GB solid-state drive, an HDMI port, an RJ-45 Ethernet port, three USB 2.0 ports, 2GB of RAM (upgradable to 4GB), and an HD Webcam. It weighs 4 pounds and comes with a two-year deal for 100GB of storage at Google Drive.

Chrome OS runs Web apps, which means people using it for things like Facebook, Google Docs, Web-based e-mail, and YouTube will notice little practical difference compared to using a browser on a more traditional operating system like Windows or OS X. However, software that runs natively on those OSes, such as Skype,
iTunes, and many games don't work on Chrome OS.

HP isn't trying to persuade would-be customers that Chrome OS is up to all computing chores. Instead, it focuses on using Google online services, calling the Pavilion 14 "a fast and easy gateway to a seamless Google experience with popular products like Search, Gmail, YouTube, Google Drive, and Google+ Hangouts for multiperson video chat as well as access to apps in the Chrome Web Store."

It's a useful suite of abilities, to be sure, which is why CNET has judged Chromebooks to be good second machines, especially with Samsung's low-cost model costing $249.

Chrome OS, like Apple's iOS, is available only preinstalled on specific hardware devices. Google periodically updates the software with new features and bug fixes. One of the latest new features to arrive in the developer version of Chrome OS lets people move the "launcher," a row of icons akin to OS X's Dock and Windows' Taskbar, to the left, right, or top sides of the screen. Previously it only could stretch across the bottom.

Google, often with considerable help from companies including Microsoft and Apple, is working to augment Web programming standards so some of that native software can run on browsers. Mozilla, too, is helping push the idea with
Firefox OS, an operating system philosophically similar to Chrome OS but designed for smartphones.

However, those Web allies don't always support Google's ideas for improving Web programming, such as its Dart programming language that Google believes is a worthy replacement for the ubiquitous JavaScript, or the Native Client technology designed to let C or C++ programmers quickly move their native software or software components to a browser without security risks.

HP is selling the laptop in the U.S. through its HPDirect Web site.

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Pictures We Love: Best of January

Photograph by Dieu Nalio Chery, AP

The magnitude 7 earthquake that struck near Port au Prince, Haiti, in January 2010 so devastated the country that recovery efforts are still ongoing.

Professional dancer Georges Exantus, one of the many casualties of that day, was trapped in his flattened apartment for three days, according to news reports. After friends dug him out, doctors amputated his right leg below the knee. With the help of a prosthetic leg, Exantus is able to dance again. (Read about his comeback.)

Why We Love It

"This is an intimate photo, taken in the subject's most personal space as he lies asleep and vulnerable, perhaps unaware of the photographer. The dancer's prosthetic leg lies in the foreground as an unavoidable reminder of the hardships he faced in the 2010 earthquake. This image makes me want to hear more of Georges' story."—Ben Fitch, associate photo editor

"This image uses aesthetics and the beauty of suggestion to tell a story. We are not given all the details in the image, but it is enough to make us question and wonder."—Janna Dotschkal, associate photo editor

Published February 1, 2013

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Ravens Defeat 49ers in Historic, Unusual Super Bowl

The Baltimore Ravens emerged Super Bowl champions after one of the strangest and most incredible Super Bowl games in recent memory.

It's the second championship for the Ravens, who pulled out a 34-31 win over the San Francisco 49ers at the Superdome in New Orleans.

The Super Bowl is the biggest spectacle in American sports, and each year becomes the most watched television event in history. This year, Jennifer Hudson kicked things off with a touching performance of "America the Beautiful" with a choir of students from Sandy Hook Elementary School.

RELATED: Super Bowl XLVII: Top 6 Things to Know

Alicia Keys accompanied herself on the piano for a long, jazzy rendition of the national anthem, before the coin toss which resulted in San Francisco receiving to start the first half.

Although the game looked at one point like it was going to be a completely unexpected blow-out, with the Ravens leading 28-6 at the beginning of the 3rd quarter, the 49ers got some unusual help that turned the showdown into a much more exciting battle.

About a third of the way into the 3rd quarter, right after a record-tying Ravens rushing touchdown, the power went out at the Superdome, knocking the lights and air conditioning out in the indoor stadium. The crowd of more than 71,000 strong, along with a lot of antsy players, coaches, and staff waited for 34 minutes for the power to fully come back on and the game to resume.

Chris Graythen/Getty Images

Super Bowl 2013: Beyonce Rocks the Halftime Show Watch Video

Super Bowl 2013: Alicia Keys Sings 'The Star-Spangled Banner' Watch Video

Super Bowl 2013: Jennifer Hudson, Sandy Hook Students Perform Watch Video

In a statement, the NFL said authorities were "investigating the cause of the power outage," and law enforcement sources told ABC News it was just an issue with the building.

That didn't stop many people on Twitter from jokingly blaming Beyonce, the energetic halftime performer who surprisingly reunited shortly with her former band Destiny's Child, for shutting down the power. After her performance, even her husband Jay-Z got in on it, tweeting "Lights out!!! Any questions??"

VIDEO: Super Bowl 2013: Beyonce Rocks the Halftime Show

The 49ers quickly followed the long delay with a touchdown, getting themselves right back into the game. Then just a few minutes later, they found themselves in the end zone again, and it appeared the power outage had flipped the momentum towards the 49ers.

With a score of 31-29 with more than 7 minutes left in the game, San Francisco looked poised to make the biggest comeback in Super Bowl history, but the team, trying for its 6th title, wasn't able to overcome the Ravens lead.

Baltimore was able to run out the clock, and the game ended with a final score of 34-31. Purple and gold confetti fell as the Ravens rushed onto the field and celebrated -- with some colorful language from quarterback Joe Flacco audible on the live broadcast, who was caught saying, "f***ing awesome" on CBS' cameras.

The game was already historic thanks to the match-up for John and Jim Harbaugh, the first head coach brothers to ever face each other on football's biggest stage. It was also the final game for the future Hall of Fame linebacker Ray Lewis, who is, as of the conclusion of the game retired from football.

This is the fifth season in a row that the Ravens have made it to the playoffs, led by Coach John Harbaugh, and SB XLVII MVP Quarterback Joe Flacco. It's the team's first Lombardi trophy since 2000. Their victor tonight made them the only team left in the NFL to have never lost a Super Bowl in multiple appearances.

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Sneaky ninja robot silently stalks its prey

MOVE over David Attenborough. A robot that moves only when it won't be seen or heard might make it easier to sneak up on animals and film them in the wild.

Defence labs have built robots that track people through cities, avoiding well-lit areas. But cities are noisy, so if a robot keeps a certain distance it's unlikely to be heard. Tracking and filming animals in the wild is tougher because they often have keen hearing and the environment is usually quieter. Matthew Dunbabin and his collaborator Ashley Tewes at the CSIRO Autonomous Systems Laboratory in Brisbane, Australia, are teaching a four-wheeled robot to move only when intermittent sounds - like bird or frog calls - will mask its movements.

In tests, the robot picked up the sounds of things like fork-lifts, cellphones and birds, and was able to predict whether they were likely to persist long enough to cover its movement. The robot can also identify its own noise, and guess how it will vary at different speeds and turning angles - calculating what this will sound like to a target up to 50 metres away.

With the help of a camera, laser scanner and the right algorithm, the robot can figure out which vantage points will provide the best cover so it can skulk in the shadows.

This article appeared in print under the headline "Sneaky ninja robot silently films its prey"

If you would like to reuse any content from New Scientist, either in print or online, please contact the syndication department first for permission. New Scientist does not own rights to photos, but there are a variety of licensing options available for use of articles and graphics we own the copyright to.

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Fiat boss eyes Chrysler merger in 2014

ROME: Fiat boss Sergio Marchionne said Sunday that he expected the merger of the Italian car giant and its US partner Chrysler will take place in 2014.

"We will succeed in doing it," he said in an interview with the editor of the Repubblica newspaper. "We and VEBA (the United Auto Workers pension fund -- a Chrysler shareholder) have different opinions on the value of Chrysler but we will resolve the problem in 2014."

Macchione, who heads both companies, had said on January 30 that the ties between the two automakers were "irreversible" and would merge "as soon as I can afford it" but did not put date on the merger.

Asked on Sunday if Fiat would keep its Turin headquarters Macchione said: "We are a big group present throughout the world, it will depend on access to financial markets and the choices of the Agnelli family" who founded Fiat.

He had "not thought" about the future name of the new entity, he said.

The deal will ultimately give Fiat a 65 per cent stake in Chrysler and full ownership by 2015.

Boosted by increased sales at Chrysler, the Italian giant on Wednesday reported a profitable 2012, announcing a fourth quarter net profit that rose to 388 million euros ($525 million) from 265 million euros the year before.

The company said it was aiming for profits of between 1.2 and 1.5 billion euros this year.

Fiat took a 20 per cent stake in Chrysler in 2009 as the third largest US automaker emerged from a government-financed restructuring under bankruptcy protection.

It has since steadily expanded its stake by purchasing shares owned by the US government and the VEBA fund.

- AFP/ck

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How Boeing's 777-300ER could help save American Airlines

American Airlines hopes its rise back to profitability and relevance can get a big jump start with the launch of all-new livery, and Boeing's 777-300ER. It is the first U.S. carrier to fly the plane, the most successful twin-engine aircraft in the world.

(Credit:
Chris Sloan/Airchive.com)

It has become the world's most-successful twin-engine airplane, but until now, no U.S. carrier has flown Boeing's 777-300ER. But with the launch on Thursday of its Dallas to Sao Paolo, Brazil flight, American Airlines has broken new ground, and is now depending on its fledgling 777-300ER fleet to re-earn its once legendary wings. And make it a lot of money.

Among the many passengers aboard the inaugural flight to Sao Paolo was Chris Sloan, an aviation writer who often flies on the most notable planes in the skies. Sloan, who previously shared his impressions of the inaugural Boeing 787 Dreamliner commercial flight with CNET, has once again let us in on what it's like to be among the first people aboard a notable, world-class airplane.

As Sloan notes, the past few years have not been kind to American Airlines. The carrier has gone through bankruptcy, seats becoming unbolted, a disastrous crash, and more.

But the airline is doing its best to come back from the dead, and the launch of service aboard the 777-300ER, as well as the roll-out of all-new livery, show that American can't be counted out.

As Sloan wrote:

In an era of smaller airliners, American inaugurated the 777-300, the largest new airliner by a U.S. carrier since the last Boeing 747-400s entered service with U.S. airliners in the late 1990s. Built to handle up to 386 passengers and fly up to 7,825 nautical miles, American's 777-300ER is the first plane flown by a U.S. carrier to feature a stand-up bar since the 1970s, Sloan wrote. American flies the aircraft in a 304-passenger, four-class and six-cabin configuration.

This inaugural, flight 963, from Dallas/Ft. Worth to São Paulo, Brazil in the author's view is one of the most significant in the airline industry in years because it is about something much bigger than just the launch of a new airliner, it's about the re-birth of a proud American institution that happens to bear the name of our country - American Airlines.

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Pictures We Love: Best of January

Photograph by Dieu Nalio Chery, AP

The magnitude 7 earthquake that struck near Port au Prince, Haiti, in January 2010 so devastated the country that recovery efforts are still ongoing.

Professional dancer Georges Exantus, one of the many casualties of that day, was trapped in his flattened apartment for three days, according to news reports. After friends dug him out, doctors amputated his right leg below the knee. With the help of a prosthetic leg, Exantus is able to dance again. (Read about his comeback.)

Why We Love It

"This is an intimate photo, taken in the subject's most personal space as he lies asleep and vulnerable, perhaps unaware of the photographer. The dancer's prosthetic leg lies in the foreground as an unavoidable reminder of the hardships he faced in the 2010 earthquake. This image makes me want to hear more of Georges' story."—Ben Fitch, associate photo editor

"This image uses aesthetics and the beauty of suggestion to tell a story. We are not given all the details in the image, but it is enough to make us question and wonder."—Janna Dotschkal, associate photo editor

Published February 1, 2013

Read More..

Former SEAL Killed at Gun Range; Suspect Arrested

A man is under arrest in connection with the killing of two men at an Erath County, Texas, gun range, police said.

One of the victims is former Navy SEAL and "American Sniper" author Chris Kyle.

"We have lost more than we can replace. Chris was a patriot, a great father, and a true supporter of this country and its ideals. This is a tragedy for all of us. I send my deepest prayers and thoughts to his wife and two children," "American Sniper" co-author Scott McEwen said in a statement to ABC News.

ABC affiliate WFAA-TV in Dallas reported that Kyle and a neighbor of his were shot while helping a soldier who is recovering from post traumatic stress syndrome at a gun range in Glen Rose.

The suspect, identified as Eddie Routh, 25, was arrested in Lancaster, Texas, after a brief police chase, a Lancaster Police Department dispatcher told ABC News.

AP Photo/The Fort Worth Star-Telegram, Paul Moseley

Routh was driving Kyle's truck at the time of his arrest and was held awaiting transfer to Texas Rangers, according to police.

Investigators told WFAA that Routh is a former Marine said to suffer from post-traumatic stress syndrome.

Kyle, 39, served four tours in Iraq and was awarded two Silver Stars, five Bronze Stars with Valor, two Navy and Marine Corps Achievement Medals, and one Navy and Marine Corps Commendation.

From 1999 to 2009, Kyle recorded more than 150 sniper kills, the most in U.S. military history.

Travis Cox, the director of FITCO Cares, the non-profit foundation Kyle established, said Kyle's wife Taya and their children "lost a dedicated father and husband" and the country has lost a "lifelong patriot and an American hero."

"Chris Kyle was a hero for his courageous efforts protecting our country as a U.S. Navy SEAL during four tours of combat. Moreover, he was a hero for his efforts stateside when he helped develop the FITCO Cares Foundation. What began as a plea for help from Chris looking for in-home fitness equipment for his brothers- and sisters-in-arms struggling with Post Traumatic Stress Disorder (PTSD) became an organization that will carry that torch proudly in his honor," Cox said in a statement.

After leaving combat duty, became chief instructor training Naval Special Warfare Sniper and Counter-Sniper teams, and he authored the Naval Special Warfare Sniper Doctrine, the first Navy SEAL sniper manual. He left the Navy in 2009.

"American Sniper," which was published last year in 2012, became a New York Times best seller.

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