Rusty rocks reveal ancient origin of photosynthesis

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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Basketball: Lakers cap emotional week with win over Trail Blazers

LOS ANGELES: Kobe Bryant scored 29 of his 40 points in the second half as the Los Angeles Lakers capped an emotional week with a much-needed 111-107 NBA victory over the Portland Trail Blazers.

Bryant added seven rebounds and two steals for the Lakers, who have won seven of their last 10 games and stand 3-1/2 games behind the Houston Rockets for the eighth and final playoff spot in the Western Conference standings.

In an interview with Sports Illustrated published this week, Bryant said he was certain the Lakers would make the playoffs.

"It's not a question of if we make the playoffs. We will," Bryant insisted.

The team, which has had more than its share of dysfunctional moments this season, has been through an emotional five days since the death on Monday of 80-year-old owner Jerry Buss.

Buss was remembered at the first Lakers game following his death, a 113-99 win over Boston on Wednesday.

At a memorial service on Thursday Bryant challenged his teammates to live up to Buss' standards of excellence.

"We're playing for something bigger than ourselves, bigger than a single season. We are playing for a great man, Dr. Jerry Buss," he said.

Playing hours after Buss was buried on Friday, the Lakers remained mindful of his legacy, Bryant said.

"I think we understand what's at stake and what this franchise stands for," Bryant said. "That gives you an extra gear."

Dwight Howard added 19 points and 16 rebounds for the Lakers, and Antawn Jamison chipped in 16 points.

JJ Hickson scored with 22 points and 11 rebounds for the slumping Blazers, who have now lost seven in a row to slip 1-1/2 games behind the Lakers.

- AFP/ir

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Water tank body still mystery

STORY HIGHLIGHTS

• Cause of death deferred, pending further examination


• Tests show hotel water is free of harmful bacteria, health department says


• Canadian university says woman not registered in classes this year


• Water "had a very funny, sweety, disgusting taste," one guest says

Los Angeles (CNN) -- Two days after the grisly discovery, the case of the Los Angeles hotel water tank corpse is a mystery with many unanswered questions.

The decomposing body of Elisa Lam floated inside a water tank on the roof of the Cecil Hotel while guests brushed their teeth, bathed and drank with water from it for as long as 19 days.

A maintenance worker, checking on complaints about the hotel's water, found the 21-year-old Canadian tourist inside one of four water cisterns Tuesday morning, Los Angeles Police Sgt. Rudy Lopez said.

How and where did Elisa Lam die?

Body found in hotel water tank

HIDE CAPTION

Los Angeles robbery-homicide detectives are treating this as a suspicious death for obvious reasons, Lopez said. Falling into a covered water tank behind a locked door on top of a roof would be an unusual accident.

An autopsy was completed, but the cause of death is deferred pending further examination, assistant chief coroner Ed Winter said Thursday. That may take six to eight weeks.

It will be several weeks before investigators have the toxicology lab report which would show whether Lam had any drugs in her system.

Any marks, injuries or wounds may suggest Lam died elsewhere and was dumped into the tank by her killer.

Water in Lam's lungs could be a sign that she drowned, but it might not tell why she was inside the small tank.

One clue comes from security camera video of Lam inside a hotel elevator the last day she was seen.

She is seen walking into the elevator, pushing the buttons for four floors and then peering out of the opened elevator door as if she is hiding or looking for someone. Clad in a red hoodie, Lam at one point walks out of the elevator before returning to it, pushing the buttons again. She then stands outside the open elevator doorway, motioning with her hands, before apparently walking away.

Lam checked into the Cecil Hotel five days earlier, January 26, on her way to Santa Cruz, California, according to police in her hometown of Vancouver, British Columbia.

Why did it it take so long to find Lam?

Lam's parents reported the University of British Columbia student missing in early February. Her daily calls home stopped on January 31, police told reporters on February 6 at a Los Angeles news conference.

Because it was an international case -- and her parents and sister flew to California to find answers -- the case may have gotten more attention than most of the several thousand missing person reports made in Los Angeles each year.

A search of the hotel then found no sign of Lam, including a trip to the roof with a police search dog, Lopez said.

Strange things began happening with the hotel's water supply later in the month, according to Sabina and Michael Baugh, a British couple who spent eight days there until checking out Wednesday. The water pressure dropped to a trickle at times.

"The shower was awful," Sabina Baugh said. "When you turned the tap on, the water was coming black first for two seconds and then it was going back to normal."

The tap water "tasted horrible," Baugh said. "It had a very funny, sweety, disgusting taste. It's a very strange taste. I can barely describe it."

But for a week, they never complained. "We never thought anything of it," she said. "We thought it was just the way it was here."

Knowing now what they didn't know then about the water is sickening, Michael Baugh said. "It makes you feel literally physically sick, but more than that you feel it psychologically. You think about it and it's not good."

Eventually, the hotel maintenance department investigated the water problem, sending a worker to look into the tank, police said. He saw Lam's lifeless body at the bottom.

A hard-working family

Randy Schmidt, a spokesman for the University of British Columbia, said Lam was registered in a class in August, but was not registered in any classes this year, according to records.

"Unfortunately, we do not have much more to say, other than to extend our deepest sympathies to the family," said Schmidt.

According to Los Angeles police, Lam tended to use public transportation.

Teika Steins, manager of a hostel in Toronto, Canada, said Lam stayed a week there in early December. Steins called the young woman friendly and outgoing.

Flowers and signs were left Thursday outside the temporarily-closed Lam family restaurant in Burnaby, British Columbia.

Tanya Grohmann, who works nearby, said she was saddened by the loss and the fact the family did not know what happened to the young woman.

"They are a hard-working family. They immigrated here," she told CNN affiliate CTV. "They've been in the neighborhood for nine years working. ... They're honest people."

Why did hotel stay open after discovery?

New guests continued to check into the Cecil in the hours after firefighters removed Lam's body from the water tank. But each guest was asked to sign a waiver releasing the hotel from liability if they become ill. "You do so at your own risk and peril," the hotel's release said. Guests who already paid for their rooms would not get refunds if they move out, it said.

CNN's repeated calls to the hotel for comment were unreturned Wednesday and Thursday.

The Los Angeles Public Health Department immediately tested the water supply, but told the manager they could stay open as long as they provided bottle water and warned guests not to drink the tap water.

The results of the testing showed no harmful bacteria in the tank or the pipes, according to Angelo Bellomo, director of environmental health for the department. Chlorine in the city's water may be the reason it is safe, he said.

All of the tanks and pipes in the building still must be drained, flushed and sanitized, Bellomo said. The water will be retested after that process, which should take several days, he said.

Several guests interviewed by CNN on Wednesday indicated the hotel management did not tell them about the body in the water supply they had been drinking and bathing in.

Qui Nguyen learned about it from a CNN reporter Wednesday morning. He decided not to sign the waiver and instead find a new hotel.

Many of its guests are tourists from other countries drawn by the hotel's billing as a "European-style" hotel that is the perfect accommodation for "spend-thrifty travelers."

But if they take Kim Cooper's tour bus ride through the neighborhood, they would hear about the Cecil being the former temporary home to at least two convicted murderers, including "Night Stalker" serial killer Richard Ramirez. Ramirez paid $14 a day to stay on the 14th floor during his 1980s killing spree, Cooper said.

The Cecil Hotel is "in the heart of the action, allowing our guest to embrace the city and the surrounding areas that make Los Angeles famous," according to the description you'll hear when you call there and are placed on hold.

In fact, the hotel is just a few blocks away from the infamous Skid Row district in downtown Los Angeles, but 16 miles from the beaches of Santa Monica, eight miles from Hollywood's Walk of Fame and 12 miles from glamorous streets of Beverly Hills that are prominently featured on the Cecil's website.

If you want a reservation at the Cecil you will have to wait until next month. The website said the hotel is "sold out" until March 1. After then, you can book a room for $65.

Hotel with corpse in water tank has notorious past

CNN's Kyung Lah, Chandler Friedman and Chuck Conder contributed to this report.

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Pentagon grounds F-35 fleet after engine crack found

Updated 9:03 PM ET

WASHINGTON The Pentagon on Friday grounded its fleet of F-35 fighter jets after discovering a cracked engine blade in one plane.

The problem was discovered during what the Pentagon called a routine inspection at Edwards Air Force Base, Calif., of an F-35A, the Air Force version of the sleek new plane. The Navy and the Marine Corps are buying other versions of the F-35, which is intended to replace older fighters like the Air Force F-16 and the Navy F/A-18.

All versions -- a total of 51 planes -- were grounded Friday pending a more in-depth evaluation of the problem discovered at Edwards. None of the planes have been fielded for combat operations; all are undergoing testing.

In a brief written statement, the Pentagon said it is too early to know the full impact of the newly discovered problem.

A watchdog group, the Project on Government Oversight, said the grounding is not likely to mean a significant delay in the effort to field the stealthy aircraft.

"The F-35 is a huge problem because of its growing, already unaffordable, cost and its gigantically disappointing performance," the group's Winslow Wheeler said. "That performance would be unacceptable even if the aircraft met its far-too-modest requirements, but it is not."

The F-35 is the Pentagon's most expensive weapons program at a total estimated cost of nearly $400 billion. The Pentagon envisions buying more than 2,400 F-35s, but some members of Congress are balking at the price tag.

Friday's suspension of flight operations will remain in effect until an investigation of the problem's root cause is determined.

The Pentagon said the engine in which the problem was discovered is being shipped to a Pratt & Whitney facility in Connecticut for more thorough evaluation.

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Cyberattacks Bring Attention to Security Reform

Recent accusations of a large-scale cyber crime effort by the Chinese government left many wondering what immediate steps the president and Congress are taking to prevent these attacks from happening again.

On Wednesday, the White House released the administration's Strategy on Mitigating the Theft of U.S. Trade Secrets as a follow-up to the president's executive order. The strategy did not outwardly mention China, but it implied U.S. government awareness of the problem.

"We are taking a whole of government approach to stop the theft of trade secrets by foreign competitors or foreign governments by any means -- cyber or otherwise," U.S. Intellectual Property Enforcement Coordinator Victoria Espinel said in a White House statement.

As of now, the administration's strategy is the first direct step in addressing cybersecurity, but in order for change to happen Congress needs to be involved. So far, the Cyber Intelligence Sharing and Protection Act (CISPA) is the most notable Congressional legislation addressing the problem, despite its past controversy.

Last April, CISPA was introduced by House Intelligence Committee Chairman Mike Rogers, R-Mich., and Rep. Dutch Ruppersberger, D-Md. The act would allow private companies with consumer information to voluntarily share those details with the NSA and the DOD in order to combat cyber attacks.

Peter Parks/AFP/Getty Images

The companies would be protected from any liabilities if the information was somehow mishandled. This portion of the act sounded alarm bells for CISPA's opponents, like the ACLU, which worried that this provision would incentivize companies to share individuals' information with disregard.

CISPA passed in the House of Representatives, despite a veto threat from the White House stemming from similar privacy concerns. The bill then died in the Senate.

This year, CISPA was reintroduced the day after the State of the Union address during which the president declared an executive order targeting similar security concerns from a government standpoint.

In contrast to CISPA, the executive order would be initiated on the end of the government, and federal agencies would share relevant information regarding threats with private industries, rather than asking businesses to supply data details. All information shared by the government would be unclassified.

At the core of both the executive order and CISPA, U.S. businesses and the government would be encouraged to work together to combat cyber threats. However, each option would clearly take a different route to collaboration. The difference seems minimal, but has been the subject of legislative debates between the president and Congress for almost a year, until now.

"My response to the president's executive order is very positive," Ruppersberger told ABC News. "[The president] brought up how important information sharing is [and] by addressing critical infrastructure, he took care of another hurdle that we do not have to deal with."

Addressing privacy roadblocks, CISPA backers said the sharing of private customer information with the government, as long as personal details are stripped, is not unprecedented.

"Think of what we do with HIPAA in the medical professions; [doctors do not need to know] the individual person, just the symptoms to diagnose a disease," Michigan Gov. John Engler testified at a House Intelligence Committee hearing in an attempt to put the problem into context.

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Synthetic llama antibodies soothe arthritis pain

ARTHRITIS may have met its match, in the form of the llama immune system. Antibodies similar to ones originally discovered in camels and llamas have helped to heal moderate to severe arthritis in a small trial.

The antibodies have inspired the design of a drug, ALX-0061, that blocks a receptor for interleukin 6. This signalling molecule amplifies inflammation, leading to sore and swollen joints. The symptoms ease once the receptor is blocked.

In the trial, 24 patients received one of three unchanging doses of ALX-0061 for six months. Another group received a placebo. Sixty-three per cent of those given the drug saw their symptoms practically vanish when measured using a standard metric, the DAS28 scale, which evaluates symptoms in 28 joints. This figure is more than twice the 30 per cent remission rate seen with the current "gold-standard" rival treatment Actemra (tocilizumab). Tocilizumab also targets interleukin 6, but it is based on a normal-sized mammalian antibody.

The remission rate was even higher – 75 per cent – for the eight patients given one of the three doses: 3 milligrams per kilogram of body weight administered once every four weeks. "These data suggest that out of every 10 patients, seven to eight could experience rapid, durable responses to their symptoms," says Josi Holz, the chief medical officer of Ablynx, in Ghent, Belgium, which released its results on 13 February.

According to Ed Moses, CEO of Ablynx, it could be the tiny size of the molecule – one-fifth the usual size – that gives it the edge over existing antibody-based treatments. "It potentially gives far faster and deeper penetration of diseased joints," he says.

Other researchers caution against over-optimism because the trial was short and small. "If the results are repeated in randomised, controlled, double-blinded studies, then they would be very impressive," says David Scott, chief medical adviser to the UK's National Rheumatoid Arthritis Society.

To take ALX-0061 forward, Ablynx is now looking for a partner to help finance such a larger, decisive trial.

This article appeared in print under the headline "Llama-inspired drug relieves arthritic pain"

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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Locals fill most jobs at new plant on Jurong Island

SINGAPORE: Tuas Power's Tembusu multi-utilities complex on Jurong Island has generated 150 jobs ahead of its official opening next week.

One hundred positions have been filled and the plant's looking for Singaporeans to fill 50 more vacancies.

Nine in 10 positions are currently held by locals.

The jobs are technical in nature, with Tuas Power looking out for graduates from polytechnics and the Institutes of Technical Education.

The Jurong Island facility provides steam, water and electricity to petrochemical firms.

Phase one of the plant's operations has been completed, with full completion expected no later than 2017.

By then, the plant would have generated a total of some 200 jobs.

- CNA/ck

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Prosecution is dealt blow as judge weighs bail for Pistorius

STORY HIGHLIGHTS

• Prosecutors say they worry Oscar Pistorius will flee, if freed on bail


• Pistorius has pledged to stay in South Africa and fight the charges


• He is accused of the premeditated murder of his model girlfriend

Pretoria, South Africa (CNN) -- A South African judge will likely decide Friday whether to release track star Oscar Pistorius following a bail hearing jolted by the revelation that the lead police investigator in the case faces attempted murder charges.

The allegations were the latest blow to a prosecution case that has suffered through several miscues during the bail hearing that began Tuesday, including admissions that police could have contaminated the crime scene and failed to properly catalog evidence.

The South African Police Service pulled Hilton Botha from the case Thursday after prosecutors reinstated seven counts of attempted murder charges against him. Botha is accused of opening fire on a minibus full of people while drunk in 2011.

Prosecutors are trying to keep Pistorius jailed pending his trial on a charge of premeditated murder in the February 14 shooting death of his girlfriend, model Reeva Steenkamp, 29.

Pistorius, 26, is accused of the premeditated murder of Steenkamp after, according to prosecutors, a heated argument in the early morning hours of Valentine's Day.

The sprinter, however, says he thought an intruder was hiding in a toilet room inside the bathroom of his Pretoria home. He says he fired into the room in a fit of terror before realizing Steenkamp was inside.

Prosecutors say they are worried Pistorius will flee the country, if he's released. Pistorius has pledged to stay in South Africa and fight the charges if released, adding that he's unlikely to escape notice as a well-known athlete who walks on prosthetic legs.

Prosecution miscues?

Court officials learned Thursday that prosecutors had restored the charges against Botha in connection with the 2011 shooting case. The charges had previously been withdrawn for additional investigation, but prosecutors decided Wednesday to proceed, said Commissioner Riah Phiyega of the South African Police Service.

Phiyega praised Botha, saying he is an experienced investigator who "has presented the case of the police well."

Botha was replaced by the department's most senior detective, Vinesh Moonoo, in a move Phiyega said positioned the department for a "long-haul" investigation of Steenkamp's killing.

During the bail hearing, being held in a dark, stuffy Pretoria courtroom, defense attorney Barry Roux hammered away at the credibility of Botha and the entire police investigation.

He argued police had missed a bullet in the toilet of the bathroom where Steenkamp was shot and may have contaminated the crime scene by failing to wear protective foot covers.

Botha told Roux that investigators didn't wear the booties because they'd run out.

Bulelwa Makeke, the spokeswoman for South Africa's National Prosecuting Authority, said before the announcement of Botha's removal that the accusations against the investigator would be little more than a "speed bump" in the Pistorius case.

Positioning the prosecution

In arguments wrapping up during Thursday's session, Prosecutor Gerrie Nel said Pistorius' defense team has failed to explain why investigators found two cell phones and the gun believed to have been used in the shooting in front of the shower.

That goes to the prosecution claim that Steenkamp didn't merely get up to relieve herself in the middle of the night, but in fact had locked herself in the bathroom with her cell phone to protect herself from Pistorius.

Roux, meanwhile, got Botha to acknowledge during the hearing that investigators had failed to collect any evidence that counters Pistorius' argument that he mistakenly shot Steenkamp.

Roux told Magistrate Desmond Nair that the prosecution's case had suffered a monumental collapse.

The defense attorney also questioned police claims that a witness who lived at least 300 meters (328 yards) from Pistorius' home had heard a raging argument coming from the home.

He also said officers had failed to properly investigate and catalog evidence found there, including ammunition and a bottle of what Botha first called testosterone before backtracking.

Roux said the substance is an herbal remedy.

Ballistic evidence

Authorities have argued that ballistic evidence shows Pistorius had to intentionally target the toilet to strike Steenkamp, and he was standing on his prosthetic legs when he shot through the bathroom door.

Pistorius said in his statement that when he shot through the door, he was feeling vulnerable to an intruder because he was not wearing his legs and had limited mobility.

When Pistorius was 11 months old, his legs were amputated below the knees because he was missing the fibulae.

He runs on special carbon fiber blades, earning the nickname "Blade Runner."

He made history last year as the first disabled athlete to compete in the able-bodied London Games. A few weeks after the Olympics, he smashed a record to win the men's 400-meter in the 2012 Paralympic Games.

Robyn Curnow reported from Pretoria, and Chelsea J. Carter reported and wrote from Atlanta. CNN's Michael Pearson and Ben Brumfield contributed to this report.

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Georgia executes man lawyers claimed was mentally ill

JACKSON, Ga. A 38-year-old inmate convicted of killing two college students in 1995 was executed in Georgia on Thursday, apologizing to the families of both victims before being injected at a state prison.

Andrew Allen Cook was pronounced dead at 11:22 p.m., about 14 minutes after he was injected with the sedative pentobarbital. He was the first inmate to be executed since the state changed its procedure in July from a three-drug combination to a single dose.

With his last words, he apologized to the families of Mercer University students Grant Patrick Hendrickson, 22, and Michele Lee Cartagena, 19, who were shot several times as they sat in a car at Lake Juliette, which is about 75 miles south of Atlanta. He said what he did was senseless.

"I'm sorry," Cook said as he was strapped to a gurney. "I'm not going to ask you to forgive me. I can't even do it myself."

He also thanked his family for "their support, for being with me and I'm sorry I took so much from you all."

The Georgia Appeals Court on Wednesday temporarily stayed Cook's execution to consider a challenge to the state's lethal injection procedure. But the Georgia Supreme Court lifted the stay Thursday and all other appeals were exhausted.

Cook's lawyers have argued at various stages in their appeals of his death sentence that he suffered from mental illness and was being treated for depression up to the time of his death.

Mary Hendrickson, the mother of one of the victims, recently told television station WMAZ-TV in Macon she's been waiting 18 years for justice.

"I think that's what it was: the devil's work," she said. "When all that is going on, I was just thinking to myself, 'Well, the devil is not going to win. He's not going to win over my heart. He is not going to win."'

The single-drug injection began at about 11:08 p.m. Cook blinked his eyes a few times, and his eyes soon got heavy. His chest was heaving for about two or three minutes as his eyes closed. Not too long after, two doctors examined him and nodded and Carl Humphrey, warden of the state prison in Jackson, pronounced him dead.

Corrections officials said Thursday evening that Cook had received visits from family earlier in the day and ate the last meal he had requested -- steak, a baked potato, potato wedges, fried shrimp, lemon meringue pie and soda.

A jury sentenced Cook to death after he was convicted in the January 2, 1995 slayings at Lake Juliette. Cook wasn't charged until more than two years later. He confessed to his father, a Macon FBI agent who ended up testifying at his son's trial.

The Georgia Bureau of Investigation reached out to John Cook in December 1995 because they were interested in speaking to his son. When he called his then-22-year-old son to tell him the GBI wanted to talk to him, he had no idea the younger man was considered a suspect.

"I said, 'Andy, the GBI is looking for you concerning the Lake Juliette homicide. Do you know anything about it?"' John Cook testified at his son's trial in March 1998. "He said, 'Daddy, I can't tell you. You're one of them. ... You're a cop."'

Eventually, Andrew Cook told his father that he knew about the slayings, that he was there and that he knew who shot the couple, John Cook recalled.

"I just felt like the world was crashing in on me. But I felt maybe he was there and just saw what happened," he said. "I then asked, 'Did you shoot them?'

"After a pause on the phone, he said, 'Yes."'

As a law enforcement officer, John Cook said he was forced to call his supervisor and contacted the Monroe County sheriff.

At the trial, as he walked away from the stand, the distraught father mouthed "I'm sorry" to the victims' families who were sitting on the front row of the courtroom. Several members of both families acknowledged his apology.

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Arias Challenged On Pedophilia Claim

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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