Chemical key to cell division revealed

In each of our cells, most of the genetic material is packaged safely within the nucleus, which is protected by a double membrane. The biochemistry behind how this membrane transforms when cells divide has finally been unravelled, offering insights that could provide new ways of fighting cancer and some rare genetic disorders.

During cell division, the membrane that surrounds the nucleus breaks down and reforms in the two daughter cells. Researchers have been split on the precise mechanisms that govern membrane reformation. One view is that proteins alone control the membrane's transformations. Another possibility is that changes in lipids – a vast group of fat-related compounds – are responsible.

Experiments had failed to show which of these two ideas was right, because it was difficult to alter lipid levels in specific compartments of cells without affecting other cellular processes.

Banafshe Larijani at Cancer Research UK's London Research Institute and her colleagues have now overcome that hurdle. They came up with a technique that transforms a type of lipid called a diacylglycerol (DAG) into another lipid, within the nuclear membrane.

Chemical cascade

The technique involves inserting two fragments of DNA into the nucleus of a cell. This causes the cell to make two proteins: the first attaches itself to the nuclear membrane, the second floats around the cell. Adding a drug – rapalogue – to the mix causes the second protein to stick to the first, which in turn causes a chemical cascade that transforms the DAG into a different kind of lipid.

Crucially, they targeted a form of DAG that does not bind to proteins, so converting it into a different lipid does not affect any processes involving proteins in the cell.

The team tested the effect of this lipid manipulation on cell division in monkey and human cancer cells. The lower the level of DAG present in the nuclear membrane, the greater the membrane malformation and chance of cell death.

This demonstrates that lipids play a role in nuclear membrane reformation that does not depend on proteins.

Larijani says it "opens the door to finding ways to kill cancerous cells" by focusing on lipids that are important to the nuclear membrane's development.

Sausage pieces

As the nucleus divides, sausage-shaped fragments of its membrane float around the cell. The fragments have curved ends, and Larijani says that changes in lipid composition generate these curves, without which the fragments cannot reassemble correctly into new membranes.

More than a dozen rare genetic conditions such as Hutchinson-Gilford progeria syndrome, which is characterised by premature ageing in children, have been linked to irregularities in cell division. A better understanding of the way the nuclear membrane forms when cells divide could be key to treating these disorders.

The research also offers a new focus for preventing the irregular cell division that underlies many cancers.

"As a result of this work we now know with confidence that DAG plays a structural role in membrane dynamics," says Vytas Bankaitis, at the Texas A&M Health Science Center in College Station, who was not involved in the study. "If we could find a molecule with suitable characteristics, this manipulation could be done [in humans], which is something that has not really been considered before."

Journal reference: PLoS ONE DOI: 10.1371/journal.pone.0051150

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Japan polls tip big win for opposition

TOKYO: Japan's main opposition party will comfortably win the general election this month, opinion polls showed Thursday, the first time surveys have indicated anything other than a fragile coalition.

The hawkish chief of the conservative Liberal Democratic Party (LDP) Shinzo Abe is also tipped to win back the premiership, an office he held for around a year until 2007, according to a telephone poll conducted by Kyodo news agency.

The LDP is on course to win up to 306 of the 480 seats in lower house of parliament on December 16, with the projected tally representing a huge jump from the 118 seats the party currently has.

The survey of 123,700 eligible voters showed Prime Minister Yoshihiko Noda's Democratic Party of Japan (DPJ) will see its number of seats plunge to between 57 and 82 from the 308 it swept to power with in 2009.

Around 1,500 candidates, fielded by 12 parties or standing as independents, are vying for the 480 seats -- 300 in single-seat constituencies and 180 allocated for proportional representation in 11 blocs.

Previous opinion polls have shown a much tighter race, with commentators expecting the election would leave Japan with a fragile coalition government.

Kyodo noted about half the voters said they had not yet decided on who to vote for.

Similar surveys by the mass-circulation Asahi and Yomiuri dailies, released Thursday, also showed the LDP was gaining momentum and was on course to win a single-party majority.

The Kyodo survey said the LDP's potential junior coalition partner New Komeito party is likely to win between 25 and 31 seats.

If the two parties joined forces they would have a two-thirds majority in the powerful lower house, giving them the right to overrule the DPJ-dominated upper house.

The Japan Restoration Party, an unwieldy coalition of followers of Osaka's outspoken mayor Toru Hashimoto and of the China-bashing former governor of Tokyo, Shintaro Ishihara, is likely to become a third-largest party, the polls showed.

The Tomorrow Party of Japan, a hastily cobbled-together grouping of DPJ malcontents and a left-leaning newcomers pledging to end Japan's nuclear power programme in 10 years, could have just 15 seats.

This month's vote is being seen as a verdict on the DPJ's three-year rule, which included the turbulent months after the nuclear disaster plunged the nation into its biggest crisis since World War II.

- AFP/ck

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Mobile apps outpace the Web and neck-in-neck with TV

It looks like a four-year-old industry is hijacking one that has been around for six decades.

According to mobile analytics firm Flurry, the time people spend on mobile apps is now nearly neck-in-neck with time spent watching television.

"With new content released via thousands of new apps each day, we expect this trend to continue," Flurry CEO Simon Khalaf wrote in a blog post today. "In fact, we ultimately expect apps on
tablets and smartphones to challenge broadcast television as the dominant channel for media consumption."

Flurry's numbers, which are based on data from more than 250,000 apps, show that time spent on mobile apps by people in the U.S. rose 35 percent from 94 minutes per day to 127 minutes, while time spent watching TV remained static. Also, time spent on mobile apps dominated time spent on the Internet with a desktop computer; in total, people used their mobile apps 1.8 times more than the Web.

This news comes as Internet guru Mary Meeker reported this week that 13 percent of all Internet traffic is now executed from a mobile device, up from 4 percent just two years ago.

Flurry speculates that tablets are one of the drivers of app growth. As more TV-style apps and connected TVs become available, Flurry believes the app trend will just continue on the up-and-up.

"Mobile and apps are gobbling up the web and consumer Internet, and that's where the opportunity is," Khalaf wrote. "And the opportunity has never been bigger. All around me, I see entrepreneurs living it, loving it and collecting it '99 cents' at a time."

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A 2020 Rover Return to Mars?

NASA is so delighted with Curiosity's Mars mission that the agency wants to do it all again in 2020, with the possibility of identifying and storing some rocks for a future sample return to Earth.

The formal announcement, made at the American Geophysical Union's annual fall meeting, represents a triumph for the NASA Mars program, which had fallen on hard times due to steep budget cuts. But NASA associate administrator for science John Grunsfeld said that the agency has the funds to build and operate a second Curiosity-style rover, largely because it has a lot of spare parts and an engineering and science team that knows how to develop a follow-on expedition.

"The new science rover builds off the tremendous success from Curiosity and will have new instruments," Grunsfeld said. Curiosity II is projected to cost $1.5 billion—compared with the $2.5 billion price tag for the rover now on Mars—and will require congressional approval.

While the 2020 rover will have the same one-ton chassis as Curiosity—and could use the same sky crane technology involved in the "seven minutes of terror"—it will have different instruments and, many hope, the capacity to cache a Mars rock for later pickup and delivery to researchers on Earth. Curiosity and the other Mars rovers, satellites, and probes have garnered substantial knowledge about the Red Planet in recent decades, but planetary scientists say no Mars-based investigations can be nearly as instructive as studying a sample in person here on Earth.

(Video: Mars Rover's "Seven Minutes of Terror.")

Return to Sender

That's why "sample return" has topped several comprehensive reviews of what NASA should focus on for the next decade regarding Mars.

"There is absolutely no doubt that this rover has the capability to collect and cache a suite of magnificent samples," said astronomer Steven Squyres, with Cornell University in New York, who led a "decadal survey" of what scientists want to see happen in the field of planetary science in the years ahead. "We have a proven system now for landing a substantial payload on Mars, and that's what we need to enable sample return."

The decision about whether the second rover will be able to collect and "cache" a sample will be up to a "science definition team" that will meet in the years ahead to weigh the pros and cons of focusing the rover's activity on that task.  

As currently imagined, bringing a rock sample back to Earth would require three missions: one to select, pick up, and store the sample; a second to pick it up and fly it into a Mars orbit; and a third to take it from Mars back to Earth.

"A sample return would rely on all the Mars missions before it," said Scott Hubbard, formerly NASA's "Mars Czar," who is now at Stanford University. "Finding the right rocks from the right areas, and then being able to get there, involves science and technology we've learned over the decades."

Renewed Interest

Clearly, Curiosity's success has changed the thinking about Mars exploration, said Hubbard. He was a vocal critic of the Obama Administration's decision earlier this year to cut back on the Mars program as part of agency belt-tightening but now is "delighted" by this renewed initiative.

(Explore an interactive time line of Mars exploration in National Geographic magazine.)

More than 50 million people watched NASA coverage of Curiosity's landing and cheered the rover's success, Hubbard said. If things had turned out differently with Curiosity, "we'd be having a very different conversation about the Mars program now."

(See "Curiosity Landing on Mars Greeted With Whoops and Tears of Jubilation.")

If Congress gives the green light, the 2020 rover would be the only $1 billion-plus "flagship" mission—NASA's largest and most expensive class of projects—in the agency's planetary division in the next decade. There are many other less ambitious projects to other planets, asteroids, moons, and comets in the works, but none are flagships. That has left some planetary scientists not involved with Mars unhappy with NASA's heavy Martian focus.

Future Plans

While the announcement of the 2020 rover mission set the Mars community abuzz, NASA also outlined a series of smaller missions that will precede it. The MAVEN spacecraft, set to launch next year, will study the Martian atmosphere in unprecedented detail; a lander planned for 2018 will study the Red Planet's crust and interior; and NASA will renew its promise to participate in a European life-detection mission in 2018. NASA had signed an agreement in 2009 to partner with the European Space Agency on that mission but had to back out earlier this year because of budget constraints.

NASA said that a request for proposals would go out soon, soliciting ideas about science instruments that might be on the rover. And as for a sample return system, at this stage all that's required is the ability to identify good samples, collect them, and then store them inside the rover.

"They can wait there on Mars for some time as we figure out how to pick them up," Squyres said. "After all, they're rocks."

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McAfee Arrested for Entering Guatemala Illegally

Eccentric software tycoon John McAfee, wanted in Belize for questioning in the shooting death of his neighbor, has been arrested in Guatemala for entering the country illegally, his Guatemala attorney told ABC News.

Before McAfee's arrest, he told ABC News in an exclusive interview he would be seeking asylum in Guetemala. McAfee was arrested by the Central American country's immigration police and not the national police, said his attorney, who was confident his client would be released within hours.

"Thank God I am in a place where there is some sanity," said McAfee, 67, before his arrest. "I chose Guatemala carefully."

McAfee said that in Guatemala, the locals aren't surprised when he says the Belizean government is out to kill him.

"Instead of going, 'You're crazy,' they go, 'Yeah, of course they are,'" he said. "It's like, finally, I understand people who understand the system here."

But McAfee added he has not ruled out moving back to the United States, where he made his fortune as the inventor of anti-virus software, and that despite losing much of his fortune he still has more money than he could ever spend.

In his interview with ABC News, a jittery, animated but candid McAfee called the media's representation of him a "nightmare that is about to explode," and said he's prepared to prove his sanity.

McAfee has been on the run from police in Belize since the Nov. 10 murder of his neighbor, fellow American expatriate Greg Faull.

During his three-week journey, said McAfee, he disguised himself as handicapped, dyed his hair seven times and hid in many different places during his three-week journey.

He dismissed accounts of erratic behavior and reports that he had been using the synthetic drug bath salts. He said he had never used the drug, and said statements that he had were part of an elaborate prank.

Johan Ordonez/AFP/Getty Images

John McAfee Interview: Software Millionaire on the Run Watch Video

John McAfee: Software Millionaire Not Officially a Suspect Watch Video

Anti-Virus Pioneer John McAfee Hiding in Belize: Police Watch Video

Investigators said that McAfee was not a suspect in the death of the former developer, who was found shot in the head in his house on the resort island of San Pedro, but that they wanted to question him.

McAfee told ABC News that the poisoning death of his dogs and the murder just hours later of Faull, who had complained about his dogs, was a coincidence.

McAfee has been hiding from police ever since Faull's death -- but Telesforo Guerra, McAfee's lawyer in Guatemala, said the tactic was born out of necessity, not guilt.

"You don't have to believe what the police say," Guerra told ABC News. "Even though they say he is not a suspect they were trying to capture him."

Guerra, who is a former attorney general of Guatemala, said it would take two to three weeks to secure asylum for his client.

According to McAfee, Guerra is also the uncle of McAfee's 20-year-old girlfriend, Samantha. McAfee said the government raided his beachfront home and threatened Samantha's family.

"Fifteen armed soldiers come in and personally kidnap my housekeeper, threaten Sam's father with torture and haul away half a million dollars of my s***," claimed McAfee. "If they're not after me, then why all these raids? There've been eight raids!"

Before his arrest, McAfee said he would hold a press conference on Thursday in Guatemala City to announce his asylum bid. He has offered to answer questions from Belizean law enforcement over the phone, and denied any involvement in Faull's death.

False Report of McAfee Arrest on Mexico Border

Over the weekend, a post on McAfee's blog claimed that he had been detained on the Belizean/Mexico border.

On Monday, a follow-up post said that the "John McAfee" taken into custody was actually a "double" who was carrying a North Korean passport with McAfee's name.

That post claimed that McAfee had already escaped Belize and was on the run with Samantha and two reporters from Vice Magazine.

McAfee did not reveal his location in that post, and a spokesman for Belize's National Security Ministry, Raphael Martinez, told ABC News on Monday that no one by McAfee's name was ever detained at the border and that Belizean security officials believed McAfee was still in their country.

However, a photo posted by Vice magazine on Monday with their article, "We Are With John McAfee Right Now, Suckers," apparently had been taken on an iPhone 4S and had location information embedded in it that revealed the exact coordinates where the photo was taken -- in the Rio Dulce National Park in Guatemala -- as reported by Wired.com.

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When is a baby too premature to save?

It was never easy, but trying to decide whether to save extremely premature babies just got harder.

A study called EPICure compared the fates of babies born 22 to 26 weeks into pregnancy in the UK in 1995 with similar babies born in 2006. In this 11-year period, the babies surviving their first week rose from 40 to 53 per cent. But an accompanying study comparing the fate of survivors at age 3 found that the proportion developing severe disabilities was unchanged, at just under 1 in 5.

"We've increased survival, but it's confined to the first week of life," says Kate Costeloe of Queen Mary, University of London, author of the first study. "Yet the pattern of death and health problems is strikingly similar between the two periods."

The absolute numbers of premature babies born over the 11 year period increased by 44 per cent, from 666 in 1995 to 959 in 2006. This meant that the absolute numbers of children with severe disabilities such as blindness, deafness or lameness also rose, increasing the burden on health, educational and social services.

Lifelong disability

"As the number of children that survive preterm birth continues to rise, so will the number who experience disability throughout their lives," says Neil Marlow of University College London, who led the second study.

By far the worst outcomes were for the youngest babies, with 45 per cent of those born at 22 or 23 weeks in 2006 developing disabilities compared with 20 per cent of those born at 26 weeks. In 1995 only two babies survived after being born at 22 weeks. In 2006, three did.

In 2006, a panel of UK ethicists concluded that babies born at 22 weeks should be allowed to die, as with babies born at or before 23 weeks in France and Holland.

Journal references: BMJ, Costeloe et al, DOI: 10.1136/bmj.e7976; Marlow et al, DOI: 10.1136/bmj.e7961

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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N. Korea completes installing rocket

SEOUL: North Korea has completed installing a long-range rocket on its launch pad, ahead of its planned launch this month in defiance of widespread international condemnation, a report said Wednesday.

All three stages of the Unha-3 rocket have been placed on the pad at the North's Sohae satellite launch station, a South Korean government source told Yonhap news agency.

"Some workers are pulling out of the site," the source said.

Pyongyang announced on Saturday that it intends to launch the rocket between December 10 and 22.

The United States and its key Asian allies South Korea and Japan have condemned the move as a disguised ballistic missile test that violates UN resolutions triggered by Pyongyang's two nuclear tests in 2006 and 2009.

North Korea is now expected to install support equipment, such as radar and cameras, before fueling the carrier, Yonhap said.

US Secretary of State Hillary Clinton on Tuesday urged her NATO allies and Russia to press North Korea to call off the mission.

"The United States is deeply concerned about North Korea's recent announcement that it plans to carry out another rocket launch," Clinton told a meeting of the NATO-Russia council.

"We urge everyone here to publicly call upon North Korea to comply fully with its UN Security Council obligations."

Pyongyang insists the launch is a "peaceful" and purely scientific mission aimed at placing a satellite in orbit.

A previous attempt in April failed when the carrier exploded shortly after take-off.

China has expressed "concern" at the launch plan, with the foreign ministry urging "relevant parties (to) act in a way that is more conducive to the stability of the Korean peninsula".

Russia added its "regret" and noted that North Korea was obliged to abide by UN resolutions.

But analysts say the international community is running out of options for pressuring the impoverished but nuclear-armed North, which is already under layers of sanctions.

The six-party, aid-for-denuclearisation talks have been at a standstill since Pyongyang walked of the forum in April 2009. It staged its second nuclear test a month later.

- AFP/ck

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The skinny on Netflix-Disney deal (FAQ)

Disney said today that it hassigned an exclusive film distribution deal with Netflix starting in 2016.

Netflix will become the only U.S. subscription TV service to offer films from Pixar, Marvel, Walt Disney Animation and Disneynature. Wall Street seemed to be overjoyed by the news. Netflix shares rose 14 percent following the announcement.

To help readers better understand the deal, CNET has put together this FAQ.

Why is this agreement special?

It's the first time that Netflix has acquired access to relatively newer movies from one of Hollywood's top six film studios. Netflix has plenty of titles produced by the major studios but they're decades old. In three years, Netflix's streaming service will offer access to movies from Disney right after they're made available for sale and rental. This is a period when Hollywood typically makes new releases available to pay-TV services, such as Starz, Epix, and HBO.

In this case, however, Netflix has exclusive access to Disney's movies during the so-called pay-TV window.

Why does Netflix have to wait three years for Disney's films?

Many of the titles are currently locked up in a licensing agreement with Starz. but that deal runs out in 2016 and Netflix outbid Starz for the future rights.

Doesn't Netflix already offer some Disney content and hasn't Netflix offered Disney films in the past?

Yes to both questions. Netflix has licensing agreements for television shows from ABC and other Disney properties. As for movies, Netflix obtained Internet rights from Starz in 2008 to hundreds of movies from Disney and Sony Pictures. Netflix's contract with Starz expired earlier this year and the titles were pulled from Netflix.

What did Netflix pay Disney for this latest agreement?

Financial terms weren't disclosed but The Los Angeles Times, citing an anonymous source, reported that the agreement is for three years and that Netflix could "ultimately pay more than $300 million annually."

Break it down for me: tell me who the winners and losers are?

Netflix users are winners, at least three years from now when the deal kicks in. One of the biggest gripes from Netflix subscribers is that the streaming service lacks enough newer titles. Netflix's leadership is showing that it will pay big to improve the selection.

But Netflix investors may be the losers if the company over paid or if it turns out that managers there could have acquired many of the same Disney titles -- in addition to those from Sony Pictures -- for the same amount that they paid for just Disney's fare.

Didn't Netflix CEO Reed Hastings say last year, after Netflix lost the Starz deal, that Disney and Sony's movies weren't that popular with his subscribers?

Right again. Today, Netflix called Disney's movies "the highest-quality, most imaginative family films being made today." In October 2011, after Starz announced that the deal with Netflix would not be renewed, Hastings downplayed the impact that the loss of titles from Disney and Sony Pictures would have on his streaming service.

He said the content acquired from Starz accounted for only about 10 percent of the service's total viewing hours. In a letter to investors, Hastings wrote: "Netflix has about 10 times the streaming content selection of ...Starz in terms of what consumers actually choose to watch."

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Scientific Results From Challenger Deep

Jane J. Lee

The spotlight is shining once again on the deepest ecosystems in the ocean—Challenger Deep in the Mariana Trench (map) and the New Britain Trench near Papua New Guinea. At a presentation today at the American Geophysical Union's conference in San Francisco, attendees got a glimpse into these mysterious ecosystems nearly 7 miles (11 kilometers) down, the former visited by filmmaker James Cameron during a historic dive earlier this year.

Microbiologist Douglas Bartlett with the University of California, San Diego described crustaceans called amphipods—oceanic cousins to pill bugs—that were collected from the New Britain Trench and grow to enormous sizes five miles (eight kilometers) down. Normally less than an inch (one to two centimeters) long in other deep-sea areas, the amphipods collected on the expedition measured 7 inches (17 centimeters). (Related: "Deep-Sea, Shrimp-like Creatures Survive by Eating Wood.")

Bartlett also noted that sea cucumbers, some of which may be new species, dominated many of the areas the team sampled in the New Britain Trench. The expedition visited this area before the dive to Challenger Deep.

Marine geologist Patricia Fryer with the University of Hawaii described some of the deepest seeps yet discovered. These seeps, where water heated by chemical reactions in the rocks percolates up through the seafloor and into the ocean, could offer hints of how life originated on Earth.

And astrobiologist Kevin Hand with the Jet Propulsion Laboratory in Pasadena, California, spoke about how life in these stygian ecosystems, powered by chemical reactions, could parallel the evolution of life on other planets.

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Subway Push Murder Suspect Implicated Self: Police

A suspect believed to be responsible for throwing a man into the path of an oncoming New York City subway train who was taken into custody today has made statements implicating himself, police said.

According to Deputy Commissioner for Public Information Paul Browne, the suspect has been questioned by police since at least early afternoon and while the suspect is in police custody, he has not been officially charged.

Police are continuing to question the suspect and more lineups have been scheduled for tomorrow, Browne said.

Police have not released the suspect's name but began questioning him Tuesday afternoon about the death of Ki-Suck Han, 58, of Queens, N.Y.

Han was tossed onto the subway track at 49th Street and Seventh Avenue around 12:30 p.m. Monday after Han confronted a mumbling man who was alarming other passengers on the train platform. Han tried to scramble back onto the platform, but was crushed by an oncoming train.

The suspect fled the station, prompting a police dragnet for a man described by witnesses and see on surveillance video as a 6-foot-tall, 200-pound black man wearing dreadlocks in his hair.

Witnesses tried to revive the victim after he was hit and provided descriptions of the suspect to police.

Dr. Laura Kaplan, medical resident at Beth Israel Medical Center who was standing on the platform during the incident rushed to give Han aid after he was hit, she said in a statement released by her medical practice today.

New York Police Department

Bystanders Pull Mom, Son From Subway Tracks Watch Video

"A security guard and I performed 3-4 minutes of chest compressions. I hope the family may find some comfort in knowing about the kindness of these good Samaritans, as they endure this terrible loss," Kaplan said.

"I would like the family to know that many people in the station tried to help Mr. Han by alerting the subway personnel," she said.

Kaplan said she wanted to console the family of Han, who she called "a brave man trying to protect other passengers that he did not know."

The suspect had reportedly been mumbling to himself and disturbing other passengers, according to ABC News affiliate WABC. Police told WABC that the suspect could be mentally disturbed.

The suspect could be heard arguing with Han just moments before he hurled Han onto the track bed, according to surveillance video released by the police. The suspect is heard telling the victim to stand in line and "wait for the R train."

A freelance photographer for the New York Post was on the platform and said he ran towards the train flashing his camera hoping to alert the train to stop in time, but the train caught Han against the shoulder deep platform wall.

The photographer, R. Umar Abbasi, caught an eerie photo of Han with his head and arms above the platform and staring at the oncoming train.

Han was treated by EMS workers on the platform for traumatic arrest and rushed to Roosevelt Hospital, where he was pronounced dead, according to the Fire Department of New York.

"I just heard people yelling. The train came to an abrupt stop about three-quarters into the station and that's when I heard a man was hit by a train," Patrick Gomez told ABC News affiliate WABC.

Police set up a command post outside the train station Monday night searching nearby surveillance cameras to try and get a clear image of the suspect, reports WABC. They said Tuesday that the investigation is ongoing.

Anyone with information is asked to call Crime Stoppers at 1-800-577-TIPS (8477). The public can also submit tips by logging onto the Crime Stoppers website at www.nypdcrimestoppers.com or by texting their tips to 274637 (CRIMES) then enter TIP577. All calls are strictly confidential.

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