Rusty rocks reveal ancient origin of photosynthesis

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SUN-WORSHIP began even earlier than we thought. The world's oldest sedimentary rocks suggest an early form of photosynthesis may have evolved almost 3.8 billion years ago, not long after life appeared on Earth.











A hallmark of photosynthesis in plants is that the process splits water and produces oxygen gas. But some groups of bacteria oxidise substances like iron instead – a form of photosynthesis that doesn't generate oxygen. Evolutionary biologists think these non-oxygen-generating forms of photosynthesis evolved first, giving rise to oxygen-generating photosynthesis sometime before the Earth's atmosphere gained oxygen 2.4 billion years ago (New Scientist, 8 December 2012, p 12).













But when did non-oxygen-generating photosynthesis evolve? Fossilised microbial mats that formed in shallow water 3.4 billion years ago in what is now South Africa show the chemical fingerprints of the process. However, geologists have long wondered whether even earlier evidence exists.












The world's oldest sedimentary rocks – a class of rock that can preserve evidence of life – are a logical place to look, says Andrew Czaja of the University of Cincinnati in Ohio. These rocks, which are found in Greenland and date back almost 3.8 billion years, contain vast deposits of iron oxide that are a puzzle. "What could have formed these giant masses of oxidised iron?" asks Czaja.


















To investigate, he analysed the isotopic composition of samples taken from the oxidised iron. He found that some isotopes of iron were more common than they would be if oxygen gas was indiscriminately oxidising the metal. Moreover, the exact isotopic balance varied subtly from point to point in the rock.












Both findings make sense if photosynthetic bacteria were responsible for the iron oxide, says Czaja. That's because these microbes preferentially oxidise only a small fraction of the dissolved iron, and the iron isotopes they prefer vary slightly as environmental conditions change (Earth and Planetary Science Letters, doi.org/kh5). His findings suggest that this form of photosynthesis appeared about 370 million years earlier than we thought.












It is "the best current working hypothesis for the origin of these deposits", says Mike Tice of Texas A&M University in College Station – one of the team who analysed the 3.4-billion-year-old microbial mats from South Africa.












William Martin at the University of Düsseldorf, Germany, agrees. "Anoxygenic photosynthesis is a good candidate for the isotope evidence they see," he says. "Had these fascinating results been collected on Mars, the verdict of the jury would surely remain open," says Martin Brasier at the University of Oxford. "But [on Earth] opinion seems to be swinging in the direction of non-oxygen-generating photosynthesis during the interval from 3.8 to 2.9 billion years ago."












This article appeared in print under the headline "Photosynthesis has truly ancient origins"




















































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US state sounds alarm over nuclear waste leaks

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LOS ANGELES - At least six tanks containing radioactive waste in the US state of Washington are leaking, the state said Friday, urging more federal help to clean up a site used to make Cold War-era bombs.

Washington governor Jay Inslee said that the extent of the leaks at the Hanford site -- which first produced fuel for nuclear bombs in World War II and closed down 25 years ago -- was "disturbing."

"There is no immediate or near-term health risk associated with these newly discovered leaks, which are more than five miles from the Columbia River," he said, after meeting US Energy Secretary Steven Chu in Washington DC.

"But nonetheless this is disturbing news for all Washingtonians," he said.

He noted that Chu, the outgoing US energy secretary, told him a week ago that only one tank was leaking, but admitted "his department did not adequately analyze data it had that would have shown the other tanks that are leaking."

"This certainly raises serious questions about the integrity of all 149 single-shell tanks with radioactive liquid and sludge at Hanford.

"I believe we need a new system for removing waste from these aging tanks, and was heartened to hear that the Department of Energy is looking at options for accelerating that process."

The Hanford nuclear site, 300km southeast of Seattle, was used to produce plutonium for the bomb that brought an end to World War II.

Output grew after 1945 to meet the challenges of the Cold War, but the last reactor closed down in 1987. Its website says: "Weapons production processes left solid and liquid wastes that posed a risk to the local environment."

Millions of gallons of leftover waste is contained in 177 tanks at the site, according to the Department of Energy, which in 1989 agreed a deal with Washington state authorities to clean up the Hanford site.

Governor Inslee urged federal authorities to act quickly to ensure that looming US budget constraints do not jeopardize extra measures for the nuclear waste site.

"Secretary Chu has a long-standing personal commitment to the clean-up of Hanford. He has assured me he will do all he can to address the issue of the leaking tanks," he said.

But he added: "Frankly, the state Department of Ecology is not convinced that current storage is adequate to meet legal and regulatory requirements.

"With potential sequestration and federal budget cuts looming, we need to be sure the federal government maintains its commitment and legal obligation to the clean-up of Hanford."

A Department of Energy spokesman, Lindsey Geisler, confirmed that "there are six tanks at the Hanford site...including the one announced last week, that show declining levels of fluid."

"There is no immediate public health risk. The Department is working with the State of Washington and other key stakeholders to address the issues associated with these tanks," he added.

Details of exactly what kind of waste was involved were not immediately available.

A spokeswoman for governor Inslee, Jaime Smith, said: "It's nuclear waste. Different tanks have slightly different kinds of waste that they're holding. We're not clear yet on exactly what has been leaking for how long."

Washington state authorities hoped for more information about the leaking tanks soon, the spokeswoman told AFP.

"The Department of Energy has committed to try and get us more information pretty quickly, hopefully within the next week or so. So we should have more information soon," she said.

- AFP/ir



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Apple yanks proxy proposal after judge backs Einhorn

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In response to a court ruling today in favor of hedge fund manager David Einhorn, Apple has yanked a proxy proposal that would eliminate its ability to issue "blank check" preferred stock without investor approval.


Apple issued a statement concerning the ruling by U.S. District Judge Richard Sullivan, who granted Einhorn's bid to block next week's shareholder vote on the proposal:


"We are disappointed with the court's ruling. Proposal #2 is part of our efforts to further enhance corporate governance and serve our shareholders' best interests. Unfortunately, due to today's decision, shareholders will not be able to vote on Proposal #2 at our annual meeting next week."



Greenlight Capital, a hedge fund run by the famed short seller Einhorn, sued Apple on February 7, asserting that the company needed to distribute preferred stock to current shareholders and that Apple had balked at the idea when it was first discussed. Einhorn argues that issuing high-yielding preferred shares to existing shareholders would allow Apple to share the value on the balance sheet but still hold a large amount of cash.


Apple's latest proxy statement, which details items up for a vote at its February 27 shareholder meeting, had included a proposal that would eliminate such preferred stock. Einhorn's suit sought an injunction to prevent Apple from bundling that provision with several other items. Rather, he wanted each item to be voted on separately.


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Space Pictures This Week: Space Rose, Ghostly Horses

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Jodi Arias' Friends Believe in Her Innocence

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Accused murderer Jodi Arias believes she should be punished, but hopes she will not be sentenced to death, two of her closest friends told ABC News in an exclusive interview.


Ann Campbell and Donavan Bering have been a constant presence for Arias wth at least one of them sitting in the Phoenix, Ariz., courtroom along with Arias' family for almost every day of her murder trial. They befriended Arias after she first arrived in jail and believe in her innocence.


Arias admits killing her ex-boyfriend Travis Alexander and lying for nearly two years about it, but insists she killed Alexander in self defense. She could face the death penalty if convicted of murder.








Jodi Arias Testimony: Prosecution's Cross-Examination Watch Video









Jodi Arias Remains Calm Under Cross-Examination Watch Video









Jodi Arias Doesn't Remember Stabbing Ex-Boyfriend Watch Video





Nevertheless, she is aware of the seriousness of her lies and deceitful behavior.


The women told ABC News that they understand that Arias needs to be punished and Arias understands that too.


"She does know that, you know, she does need to pay for the crime," Campbell said. "But I don't want her to die, and I know that she has so much to give back."


Catching Up on the Trial? Check Out ABC News' Jodi Arias Trial Coverage


The lies that Arias admits she told to police and her family have been devastating to her, Bering said.


""She said to me, 'I wish I didn't have to have lied. That destroyed me,'" Donovan said earlier this week. "Because now when it's so important for her to be believed, she has that doubt. But as she told me on the phone yesterday, she goes, 'I have nothing to lose.' So all she can do is go out there and tell the truth."


During Arias' nine days on the stand she has described in detail the oral, anal and phone sex that she and Alexander allegedly engaged in, despite being Mormons and trying to practice chastity. She also spelled out in excruciating detail what she claimed was Alexander's growing demands for sex, loyalty and subservience along with an increasingly violent temper.


Besides her two friends, Arias' mother and sometimes her father have been sitting in the front row of the courtroom during the testimony. It's been humiliating, Bering said.


"She's horrified. There's not one ounce of her life that's not out there, that's not open to the public. She's ashamed," she said.






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Mood-sensing smartphone tells your shrink how you feel

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PEOPLE with anxiety, depression or stress are often asked to record their mood changes throughout the day, helping psychologists fine-tune their treatment. But they often forget, recording only sparse information at best. Now an emotion-sensing smartphone app that automatically generates someone's "mood diary" could give psychologists all the data they need.













It's the brainchild of Matt Dobson and Duncan Barclay, founders of speech recognition firm EI Technologies, based in Saffron Walden, UK. Instead of relying on people writing diaries, the app, called Xpression, listens for telltale changes in a person's voice that indicate whether they are in one of five emotional states: calm, happy, sad, angry or anxious/frightened. It then lists a person's moods against the times they change, and automatically emails the list to their psychologist at the end of the day.












To work, the app has to be always on, listening out for the user's voice once every second, whether they are talking to family, friends, colleagues or even pets. It also listens in on phone calls. If the user is silent, the app does nothing. Crucially for the users' privacy, it doesn't record their words, instead seeking out telltale acoustic features – like pitch – that are indicative of emotional state.











This kind of emotion recognition via voice pattern already works well and is a "hot area" of research, says Stephen Cox, head of the speech processing lab at the University of East Anglia in Norwich, UK, who is scientific adviser for the firm.













Initially, Xpression will send 200-millisecond-long acoustic snapshots to a remote server where a machine-learning system will work out a person's emotional state before sending it back to the app for storage. Factors like voice loudness, intensity, changes in pitch and speaking pace allow the system to accurately estimate somebody's emotional state. "We extract acoustic features and let the machine-learning system work it out," says Cox. This ability will be built into the app itself eventually, says Dobson.












There's a strong need for this kind of technology, says Adrian Skinner, a clinical psychologist with the UK's National Health Service in Harrogate, North Yorkshire. "With conditions like depression, people tend to stop doing things like filling in mood diaries. If this app gives us more complete diaries it could help us better find the day-to-day triggers that raise or lower a patient's mood," he says.


















The firm is a finalist in a UK government competition to identify the nation's top mobile tech company, to be judged on 26 February. An insurance company has already expressed an interest in using the app to ensure the workplace stress therapy it pays for is effective. Clinical trials are due to take place later this year.












This article appeared in print under the headline "We know how you really feel"




















































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Uncertainty hangs heavy as Italy braces for elections

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ROME: Italy was poised to hold its most important elections in a generation starting on Sunday, as financial markets warned an unclear outcome could plunge the eurozone's third economy back into crisis.

Italians will cast their ballots as they grapple with the longest recession in two decades and several rounds of austerity cuts that have caused deep resentment and could favour a low turnout and a high number of protest votes.

The most likely outcome is a centre-left government led by Democratic Party leader Pier Luigi Bersani, a cigar-chomping former communist with a down-to-earth manner who now espouses broadly pro-market economic views.

But the result is by no means certain and whether Bersani will be able to form a stable coalition is in doubt. Some fear there may have to be another election within months after a reform of a maddeningly complex electoral law.

With everything at stake, the campaign has been remarkably underwhelming, with few rallies and a lot of back-and-forth in television interviews that have provided little or no detail on sometimes extravagant programme promises.

A case in point was Silvio Berlusconi's promise to refund Italians an unpopular property tax levied by Prime Minister Mario Monti's government in a letter that prompted some to queue up to claim their money back immediately.

European capitals and foreign investors will be watching closely as a return to Italy's free-wheeling public finances could spell disaster for the eurozone.

"We believe that a risk exists that after the February 24-25 elections there may be a loss of momentum on important reforms to improve Italian growth prospects," Standard & Poor's ratings agency said in a report this week.

London-based Capital Economics warned that even with a stable governing majority "huge underlying economic problems suggest that it may only be a matter of time before concerns about the public finances begin to build again."

"And a hung parliament might plunge Italy and the eurozone back into crisis rather sooner," the independent economic research company said this week.

Polls open at 0700 GMT on Sunday and close at 1900 GMT. A second day of voting on Monday begins at 0600 GMT and ends at 1400 GMT, after which preliminary results will begin to trickle through late Monday and into Tuesday.

Wild card

The wild card in the election will be Beppe Grillo, a tousle-haired former comedian whose mix of invective and idealism appeals to protest voters fed up with corrupt politicians. He has spoken to packed squares across Italy.

Bersani has said he will follow the course set by Monti, a former high-flying European commissioner roped in to replace the scandal-tainted Berlusconi who was forced to step down in November 2011.

But Bersani will come under immediate pressure to row back on austerity and do more to create jobs in an economy where an already record-high unemployment rate of 11.2 per cent masks far higher joblessness among women and young people.

A Bersani victory is far from a sure thing mainly because of the rapid rise in the polls of Berlusconi, the irrepressible 76-year-old billionaire tycoon who is still in the game even after 20 tumultuous years in Italian politics.

This is the sixth election campaign for Berlusconi, who has been prime minister three times, has survived multiple court cases, sex scandals and diplomatic gaffes.

One recent poll said he was within 2.5 points of catching up with Bersani.

Berlusconi has pursued a populist campaign, intimating that Italy's current social misery can be blamed on a "hegemonic" Germany imposing austerity.

The president of the European Parliament, who was once invited to play the role of a Nazi camp guard by Berlusconi during a speech when he was still prime minister, has warned Italians not to vote for the flamboyant tycoon.

"Berlusconi has already sent Italy into a tailspin with irresponsible government action and personal capers," Martin Schulz told German tabloid Bild, adding that Italy should not lose its new found confidence in Europe.

Several polls indicate that Bersani may score only a half-victory by managing to secure a stable majority in the lower house of parliament, the Chamber of Deputies, but failing to get one in the upper house, the Senate.

That would give Monti, a somewhat staid economics professor who is running as head of an eclectic centrist grouping, a crucial role as a coalition partner and could bring him back into a government with a ministerial posting.

An average of the most recent polls, which cannot be published in the two weeks leading up to the election, would give Bersani 34 per cent, Berlusconi 30 per cent, Grillo 17 per cent and Monti between 10 and 12 per cent of the vote.

Coming after the last polls were made public, Pope Benedict XVI's resignation could boost the church-going Monti and stop Berlusconi as it has drawn away the media attention that the showman tycoon has often relied on.

The run-up to the vote has also been marked by a succession of high-profile corruption inquiries against politicians and business leaders in a period similar to one in the early 1990s that brought down an entire political class.

Monti has said that the storm of scandals marks "the end of an era".

- AFP/ck



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Social media aggregator Memolane to shut down

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Memolane's timeline service.



(Credit:
Eddie Echo/CNET)



Memolane, a social media aggregator that promised trips down memory lane, announced today it is shutting down immediately and will delete users' account content tomorrow.


Launched in 2010, the Web app extracted each moment users shared on popular social-networking services such as Facebook, Last.fm, Twitter, Foursquare, and others and combined them into one visual timeline. Posts/comments/tweets/etc. were organized by their respective dates and posted as memos under each date.


The San Francisco-based company had raised $2.5 million in venture capital but announced today in a company blog post that it is joining another company that it did not identify that would "utilize the Memolane features in an expanded way, adding more value to all the great memories captured on social media."


Our goal was to make it exciting to relive great adventures with friends. We are proud that we could bring joy to people's lives by sending out daily emails with fun memories from the past. As well, it has been a thrill to share in the excitement when one of our fans rediscovers a precious moment that was once lost.


It wasn't immediately clear if Memolane had been acquired by another company, and if so, who that company might be. But Memolane said the "merger" means that all accounts and their contents would be deleted Friday but noted that the content would still be available at users' original social media sources.


The company also suggested users try formerly competing services offered by Timehop and Jolicloud.


CNET has contacted Memolane for more information and will update this report when we learn more.


(Via TNW)


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Oldest Known Wild Bird Hatches Chick at 62

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Wisdom, the oldest known wild bird, has yet another feather in her cap—a new chick.


The Laysan albatross (Phoebastria immutabilis)—62 years old at least—recently hatched a healthy baby in the U.S. Midway Atoll National Wildlife Refuge, her sixth in a row and possibly the 35th of her lifetime, according to the U.S. Geological Survey's (USGS) North American Bird Banding Program. (Related: "51-Year-Old Albatross Breaks N. American Age Record [2003].")


But Wisdom's longevity would be unknown if it weren't for a longtime bird-banding project founded by USGS research wildlife biologist Chandler Robbins.


Now 94, Robbins was the first scientist to band Wisdom in 1956, who at the time was "just another nesting bird," he said. Over the next ten years, Robbins banded tens of thousands of black-footed albatrosses (Phoebastria nigripes) and Laysan albatrosses as part of a project to study the behavior of the large seabirds, which at the time were colliding with U.S. Navy aircraft.


Robbins didn't return to the tiny Pacific island—now part of the U.S. Papahānaumokuākea Marine National Monument—until 2002, when he "recaptured as many birds as I could in hopes that some of them would be the old-timers."


Indeed, Robbins did recapture Wisdom—but he didn't know it until he got back to his office at the Patuxent Wildlife Research Center in Laurel, Maryland, and checked her band number in the database.


"That was real exciting, because we didn't think the chances of finding one that old would be that good," Robbins said Wednesday in an interview from his office at the Patuxent center, where he still works.



Chandler Robbins counts birds.

Chandler Robbins counts birds in Maryland's Patuxent Research Refuge.


Photograph by David H. Wells, Corbis




Albatrosses No Bird Brains


Bigger birds such as the albatross generally live longer than smaller ones: The oldest bird in the Guinness Book of Animal Records, a Siberian white crane (Leucogeranus leucogeranus), lived an unconfirmed 82 years. Captive parrots are known to live into their 80s. (See National Geographic's bird pictures.)



The Laysan albatross spends most of the year at sea, nesting on the Midway Atoll (map) in the colder months. Birds start nesting around five years of age, which is how scientists knew that Wisdom was at least five years old in 1956.



Because albatrosses defend their nests, banding them doesn't require a net or a trap as in the case of other bird species, Robbins said—but they're far from tame.


"They've got a long, sharp bill and long, sharp claws—they could do a job on you if you're not careful how to handle them," said Robbins, who estimates he's banded a hundred thousand birds.


For instance, "when you're not looking, the black-footed albatross will sneak up from behind and bite you in the seat of the pants."


But Robbins has a fondness for albatrosses, and Wisdom in particular, especially considering the new dangers that these birds face.


Navy planes are no longer a problem—albatross nesting dunes were moved farther from the runway—but the birds can ingest floating bits of plastic that now inundate parts of the Pacific, get hooked in longlines meant for fish, and be poisoned by lead paint that's still on some of Midway Atoll's buildings. (Also see "Birds in 'Big Trouble' Due to Drugs, Fishing, More.")


That Wisdom survived so many years avoiding all those hazards and is still raising young is quite extraordinary, Robbins said.


"Those birds have a tremendous amount of knowledge in their little skulls."


"Simply Incredible"


Wisdom's accomplishments have caught the attention of other scientists, in particular Sylvia Earle, an oceanographer and National Geographic Explorer in Residence, who said by email that Wisdom is a "symbol of hope for the ocean." (National Geographic News is part of the National Geographic Society.)


Earle visited Wisdom at her nest in January 2012, where she "appeared serenely indifferent to our presence," Earle wrote in the fall 2012 issue of the Virginia Quarterly Review.


"I marveled at the perils she had survived during six decades, including the first ten or so years before she found a lifetime mate. She learned to fly and navigate over thousands of miles to secure enough small fish and squid to sustain herself, and every other year or so, find her way back to the tiny island and small patch of grass where a voraciously hungry chick waited for special delivery meals."


Indeed, Wisdom has logged an estimated two to three million miles since 1956—or four to six trips from Earth to the moon and back, according to the USGS. (Related: "Albatross's Effortless Flight Decoded—May Influence Future Planes.")


Bruce Peterjohn, chief of the North American Bird Banding Program, called Wisdom's story "simply incredible."


"If she were human, she would be eligible for Medicare in a couple years—yet she is still regularly raising young and annually circumnavigating the Pacific Ocean," he said in a statement.


Bird's-Eye View


As for Robbins, he said he'd "love to get out to Midway again." But in the meantime, he's busy going through thousands of bird records in an effort to trace their life histories.


There's much more to learn: For instance, no one has ever succeeded in putting a radio transmitter on an albatross to follow it throughout its entire life-span, Robbins noted.


"It would be [an] exciting project for someone to undertake, but I'm 94 years old," he said, chuckling. "It wouldn't do much for me to start a project at my age."


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Arias Challenged On Pedophilia Claim

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Accused murderer Jodi Arias was challenged today by phone records, text message records, and her own diary entries that appeared to contradict her claim that she caught her ex-boyfriend, Travis Alexander, looking at pictures of naked boys.


Arias had said during her testimony that one afternoon in January 2008, she walked in on Alexander masturbating to pictures of naked boys. She said she fled from the home, threw up, drove around aimlessly, and ignored numerous phone calls from Alexander because she was so upset at what she had seen.


The claim was central to the defense's accusation that Alexander was a "sexual deviant" who grew angry and abusive toward Arias in the months after the incident, culminating in a violent confrontation in June that left Alexander dead.


Arias claimed she killed him in self-defense. She could face the death penalty if convicted of murder.


Catching Up on the Trial? Check Out ABC News' Jodi Arias Trial Coverage


Today, prosecutor Juan Martinez, who has been aggressive in questioning witnesses throughout the trial, volleyed questions at her about the claim of pedophilia, asking her to explain why her and Alexander's cell phone records showed five calls back and forth between the pair throughout the day she allegedly fled in horror. Some of the calls were often initiated Arias, according to phone records.








Jodi Arias Doesn't Remember Stabbing Ex-Boyfriend Watch Video









Jodi Arias Murder Trial: Testimony About Ex's Death Watch Video









Arias on Ex-Boyfriend's Death: 'I Don't Remember' Watch Video





She and Alexander also exchanged text messages throughout the afternoon and evening at a time when Arias claims the pedophilia incident occurred. In those messages they discuss logistics of exchanging one another's cars that night. Alexander sends her text messages about the car from a church social event he attended that night that she never mentioned during her testimony.


Arias stuck by her claim that she saw Alexander masturbating to the pictures, and her voice remained steady under increasingly-loud questioning by Martinez.


But Martinez also sparred with Arias on the stand over minor issues, such as when he asked Arias detailed questions about the timing and order of events from that day and Arias said she could not remember them.


"It seems you have problems with your memory. Is this a longstanding thing? Since you started testifying?" Martinez asked.


"No it goes back farther than that. I don't know even know if I'd call it a problem," Arias said.


"How far back does it go? You don't want to call them problems, are they issues? Can we call them issues? When did you start having them?" he asked in rapid succession. "You say you have memory problems, that it depends on the circumstance. Give me the factors that influence that."


"Usually when men like you or Travis are screaming at me," Arias shot back from the stand. "It affects my brain, it makes my brain scramble."


"You're saying it's Mr. Martinez's fault?" Martinez asked, referring to himself in the third person.


"Objection your honor," Arias' attorney finally shouted. "This is a stunt!"


Timeline of the Jodi Arias Trial


Martinez dwelled at one point about a journal entry where Arias wrote that she missed the Mormon baptism of her friend Lonnie because she was having kinky sex with Alexander. He drew attention to prior testimony that she and Alexander used Tootsie Pops and Pop Rocks candy as sexual props.


"You're trying to get across (in the diary entry) that this involved a sexual liaison with Mr. Alexander right?" he asked. "And you're talking about Tootsie Pops and Pop Rocks?"


"That happened also that night," Arias said.


"You were there, enjoying it, the Tootsie Pops and Pop Rocks?" he asked again, prompting a smirk from Arias.


"I enjoyed his attention," Arias said.






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