Sunday, March 17, 2013

Palestinian lawmaker, mother of militants, dies

GAZA CITY, Gaza Strip (AP) ? A firebrand Palestinian lawmaker known as the "mother of martyrs" who championed her sons' attacks on Israelis has died.

Health official Ashraf Al-Kidra says lawmaker Mariam Farhat died Sunday in a Gaza hospital of health complications including lung ailments and kidney failure.

Farhat, who was 64, lost three sons in militant activities against Israelis.

In 2002, she recorded a farewell video with her 17-year-old son Mohammed, giving him her blessing the night before a shooting attack in a Jewish settlement. He killed five seminary students before he was shot dead by soldier.

Two other sons were killed by Israeli forces while they were preparing attacks, and another son is in an Israeli prison.

About 4,000 Palestinians attended her funeral, including Hamas Prime Minister Ismail Haniyeh.

Source: http://news.yahoo.com/palestinian-lawmaker-mother-militants-dies-130719155.html

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Common Ground News Service: The Day I Joined the Catholics for Lent

By Mohamed Ali Saleh

Washington, D.C. -- I joined the annual Lent celebrations at Epiphany of Our Lord Byzantine Catholic Church one Friday last month in Annandale, Va. I didn't mind fasting from meat all day, then enjoying a huge dinner of cheese-stuffed pirohis (ravioli-like pasta) served by a woman who cheerfully asked whether I wanted more of everything. "Yes," I said. "More butter?" "Yes." "More minced onion in butter." "Absolutely."

I could do this every day of the week.

While the health benefits seemed questionable, the spiritual benefits were definitely not. That day, I shared with non-Muslims a practice which, though different from fasting in Islam, has the same roots and traditions. It reminded me how much our faith traditions have in common.

I have participated in many non-Muslim religious events since coming to Washington, D.C., in 1980. In order to discover different faiths and teach my three children to be open to other religions, I took them to various churches, synagogues, Hindu, Sikh and Buddhist temples when they were young. But I had never been to a church during Lent until this year.

Lent is the 40-day period between Ash Wednesday and Easter Sunday on the Gregorian calendar. This year, it takes place between Feb. 13 and March 31. The period commemorates Jesus' fasting in the desert, where he was tempted by Satan.

Hundreds of people gathered in the large church dining hall, and volunteers helped cook, serve and clean up. The scene reminded me of my childhood in Sudan. In the village of Wadihaj, in northern Sudan, where I was born and grew-up, the villagers took food to the small local mosque where they shared everything as a community after a long day of fasting.

At the church, Rev. Deacon Elmer M. Pekarik delivered a short prayer just before food was served. Similarly, in my native village, it wasn't just about eating. Right after people broke their fast with a date and a sip of water, they stood up to pray.

For some Christians, the Lenten period is a 40-day fast from all animal products, including eggs, milk and cheese. For some others, fish is exempted; for others still, they fast from meat two days of the week, which was the practice at the Byzantine Catholic Church. In another common practice, some Christians select one particularly loved thing to give up for the entire period, such as chocolate or even Facebook.

As I sat alone enjoying my many pirohis in the church's dining hall, an old man from Bulgaria, who I'll call Andrei, wondered if he could join me. Thus began an informal exchange about fasting in our different faith traditions.

My new friend complained how few Christian Americans fast these days. "Some Americans say they fast from eating chocolate and other luxuries," he grumbled. And he reminisced about fasting when he was a teenager in Bulgaria, and described, jokingly, the pre-Lent tendency to consume to excess -- smaller than, but similar in intention to the pre-Lent Mardi Gras celebrations in the United States or Carnival in Brazil.

It was then my turn to talk about fasting during Ramadan. For one lunar month, from dawn to sunset, Muslims abstain from food and drink.

I explained to Andrei that the Quran says, "Fasting is an obligation upon you (Muslims) as it was for those before you" (2:183). Also, I told him how the holy book talks about Jesus' 40-day fast, and how Prophet Mohammad fasted with Jews to commemorate their exodus from Egypt. Many Sunni Muslims today choose to fast on this day, known as Ashura, because of this fact. (Meanwhile, for Shiite Muslims, Ashura commemorates the martyrdom of Imam Hussein.)

At the Byzantine Catholic Church, it was time to stop talking and eating in order to pray, similar to observing the tarawih prayers (nightly congressional prayers) during Ramadan. Andrei introduced me to Rev. Deacon Pekarik, who took me from the dining hall to the main church. Pekarik, as well as other priests and members of the congregation welcomed me to join them, asking only whether I was Catholic, because non-Catholics do not receive Communion.

He regretted that I had paid for the meal, saying I was a guest of the church. He added that they were honoured to have me there. It again reminded me of my village in Sudan, when passers-by, walking or riding donkeys, were offered -- and sometimes pressured -- to share food with the villagers.

When the church service ended, I turned around to leave. While a Catholic service and an Islamic service are different, many of our practices are the same and I felt overwhelmed by a feeling of our shared human endeavours to get closer to the divine.

Mohammad Ali Saleh is based in Washington. He is a correspondent for major Arabic newspapers and magazines in the Middle East. He tweets @Mellow Muslim, and runs MohammadAliSalih.com This article was written for the Common Ground News Service (CGNews).

Source: Common Ground News Service (CGNews), 12 March 2013. Copyright permission is granted for publication.

HuffPost Religion invites you to share your Lent reflections, experiences, stories and photos with us. Send them to religion@huffingtonpost.com and check out our Lent liveblog.

?

Follow Common Ground News Service on Twitter: www.twitter.com/CGNewsService

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Source: http://www.huffingtonpost.com/common-ground-news-service/the-day-i-joined-the-catholics-for-lent_b_2875477.html

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Samsung Galaxy S4 to Hit Indian Stores in First Week of May: Report

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Source: www.ibtimes.com --- Saturday, March 16, 2013
Galaxy S4 shipments are most likely to come in the first week of May in the subcontinent as Samsung holds the top position in the burgeoning Indian smartphone market and to capitalize on the demand Samsung is expected to release Galaxy S4 as soon as possible in India. ...

Source: http://www.ibtimes.comhttp:0//www.ibtimes.co.in/articles/446880/20130316/samsung-galaxy-s4-india-release-date-specification.htm

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Saturday, March 16, 2013

New beautifully colored long-horned beetle from Yunnan, China

Friday, March 15, 2013

The beetle family Cerambycidae, also known as long-horned beetles or longicorns, is characterized by emblematic extremely long antennae, which are usually longer than the total body length of the animal. The family is rather rich in diversity with more than 20 000 species known, distributed worldwide. Some representatives of these bizarre-shaped beetles, are also known as serious pests with their wood-feeding larvae causing extensive damage to living trees or untreated lumber. The beetles from this family are mainly associated with leaf litter habitats, where the specimens in this study were also collected.

The newly discovered species, Schwarzerium yunnanum, represents a remarkably engaging representative of the family with a blue-greenish beautifully colored body, and distinctive blue legs. A new subgenus, Rugosochroma, is also erected as a result of this recent discovery. The specimens examined were found in the Yunnan Province of China, where the name of the new species is derived from The study was published in the open access journal Zookeys.

Alongside the new species, seven known ones have been recorded from China for the first time. Among these are the very rare Aphrodisium tricoloripes, known only from China, Myanmar and Vietnam, as well as Chloridolum semipunctatum, so far exclusively found in Northern Laos.

All the species described, including the new one, belong to the subfamily Cerambycinae, which includes 750 genera in total. Within the long-horned beetle family, this remarkable biodiversity can be only rivaled by a single other subfamily Lamiinae, more commonly known as flat-faced longhorns.

###

Pensoft Publishers: http://www.pensoft.net

Thanks to Pensoft Publishers for this article.

This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.

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Source: http://www.labspaces.net/127323/New_beautifully_colored_long_horned_beetle_from_Yunnan__China

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Women Kept Guitars Strumming During WWII (Voice Of America)

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Friday, March 15, 2013

Mitch McConnell?s claim that the Democrats plan a $1.5 trillion tax hike (Washington Post)

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WSJ: Google breaks up maps and commerce unit, Jeff Huber moves to Google X

WSJ Google splits up maps and commerce unit, Jeff Huber moves to Google XIt looks like the shakeups at Google this week aren't over yet. Following Andy Rubin's departure from the Android team and some "spring cleaning" that stuck a fork in Google Reader, The Wall Street Journal is now reporting that the company is breaking up its mapping and commerce unit. According to the paper, maps will now be a part of Google's search unit, while commerce will fall under the advertising group. What's more, the WSJ also reports that the head of that soon-to-be-former unit, Jeff Huber, will be moving to Google X, the lab responsible for projects like Glass and Google's self-driving car.

Update: Jeff Huber has now posted a brief statement on both Google+ and Twitter. He says, "finishing up my first decade at Google, and excited to return to my startup roots and begin the next one at Google X!" A Google spokesperson has also issued the following statement:

"Jeff is an extraordinary executive. He just finished his first decade at Google -- having worked on some of our most complicated issues like ads, apps, payments and geo -- and now he is eager to work in more of a start up like environment."

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Comments

Source: The Wall Street Journal

Source: http://feeds.engadget.com/~r/weblogsinc/engadget/~3/YAQL_ArQNVM/

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'Oz' Vs. 'Burt Wonderstone': Who Will Make Box-Office Magic?

Steve Carell and Jim Carrey comedy will make its debut this weekend after the great and powerful debut of 'Oz.'
By Ryan J. Downey


Steve Carell, Steve Buscemi and Jim Carrey in "The Incredible Burt Wonderstone"
Photo: Warner Bros. Entertainment

Source: http://www.mtv.com/news/articles/1703724/oz-burt-wonderstone-box-office-weekend.jhtml

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Bebestore Lands $10.2M From W7, Atomico In The Race For Brazil's Kid-Focused eCommerce Market

Screen shot 2013-03-13 at 3.24.19 AMAfter nearly being eradicated when the Dot-com bubble burst in 2000, the Brazilian startup community has been slow to come back. However, over the last two years, growth has been accelerating and Brazil's startups seem poised to make a comeback. As Roi pointed out recently, the support ecosystem for young businesses in Brazil is still thin and plenty of friction remains (like high labor costs and inflexible legislation), but the potential is big and getting bigger -- and venture capital is beginning to flow as a result.

Source: http://feedproxy.google.com/~r/Techcrunch/~3/TV_xic47slI/

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House Education Committee hears testimony on ways to strengthen ...

college studentsEarlier this morning the House Committee on Education and the Workforce,?led by Chairman John Kline (R-Minn.), held a hearing on college loans to look at how the government can simplify and strengthen its current federal aid programs to make college more obtainable for all young Americans.

Dr. Deborah J. Lucas, a Sloan Distinguished Professor of Finance at the Massachusetts Institute of Technology, urged the committee to revisit how the interest rates on student loans are calculated.

?The current practice of setting fixed interest rates that extend many years into the future?rather than linking them by formula to prevailing market interest rate conditions?has adverse consequences for students, for taxpayers, and for the stability and control of budgetary costs,? Lucas said.

She added that having the government fix the interest rate results in government subsidies shrinking when students would benefit from them the most. It should be noted that the interest rate on the federal Stafford loan is set set to increase once again this summer.

Jason Delisle, the director of the Federal Education Budget Project for the New America Foundation, called on the committee to discuss the current flaws in the 2007 Income-Based Repayment plan and use that as the sole repayment option for future borrowers.

Not only are record numbers of Americans struggling to pay back college loan debts, but in just a few years there will be more Americans with outstanding student loans than receive social security or food stamps, according to Justin Draeger,?president and CEO of the National Association of Student Financial Aid Administrators. A media advisory released by the committee Monday noted that the average full-time undergraduate received $13,218 in student aid during the 2011-2012 academic year and that 73 percent of all student aid comes from the federal government.

?Given these numbers, it?s imperative that we get federal student loan policies right. We have a collective interest in ensuring that federal loans remain accessible, affordable, predictable, and fiscally sustainable,? he told the committee.

Draeger also suggested that the committee consider revising its loan counseling programs so that students and their families are better educated when it comes to the financial loan process.

Dr. Charmaine Mercer, the Vice President of Policy at the Alliance for Excellent Education, reminded the committee that they shouldn?t just focus on re-evaluating?the student loan process, but also federal grants and tax credits.

?The complexities of the federal student aid system require that it be examined in its entirety,?Mercer?said. ?Addressing any one aspect of this system is necessary but individually, each is not sufficient for true reform of postsecondary aid programs and promoting student success and completion.?

Source: http://redalertpolitics.com/2013/03/13/house-education-committee-hears-testimony-on-ways-to-strengthen-college-student-aid-programs/

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Sunday, March 3, 2013

WRITING TIP: Everything is speaking to you ? writingfromthesoul.net

writing tipIn a rush to get things done, are you treating the things you meet as though they are stones in a stagnant world? What if everything is alive and speaking to you, if only you had ears to hear? You can enliven your writing?and your day?by enlivening your perspective. Try taking a walk, opening to the messages that the world is trying to tell you. (Such as the guy walking toward you, carrying a yellow box?the same yellow that used to color your mother?s kitchen?and then the sign in the shop window, also yellow, that says ?caution: breakable.?) Try warming up your writing time with a freewrite, using as a prompt the images you assembled on your walk, listening deeply and ready to be surprised by what they say.

Source: http://writingfromthesoul.net/2013/03/writing-tip-everything-is-speaking-to-you/?utm_source=rss&utm_medium=rss&utm_campaign=writing-tip-everything-is-speaking-to-you

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Saturday, March 2, 2013

Iditarod kicks off with festive ceremonial start

ANCHORAGE, Alaska (AP) ? Mushers and their dogs are taking a leisurely jaunt through Anchorage in the ceremonial start of Alaska's Iditarod Trail Sled Dog Race.

The 1,000-mile race kicked off Saturday in a festive mood as 66 teams posed with fans and sailed their sleds 11 miles on streets covered with trucked-in snow.

The event comes ahead of the real, competitive start of the race Sunday in Willow 50 miles to the north.

From there, mushers and their dog teams begin making their way through unforgiving wilderness toward the finish line in Nome on Alaska's western coast.

The winner will get a new truck and $50,400. The rest of the $600,000 purse will be split between the next 29 mushers to cross the finish line.

___

Follow Rachel D'Oro on Twitter at https://twitter.com/rdoro

Source: http://news.yahoo.com/iditarod-kicks-off-festive-ceremonial-start-190500240.html

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Sarah Palin: The Government Is Stockpiling Ammo to Use Against US Citizens (Little green footballs)

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China says US-based hackers target its websites

BEIJING ? China's military said Thursday that overseas computer hackers targeted two of its websites an average of 144,000 times per month last year, with almost two-thirds of the attacks originating in the United States.

The claim from Defense Ministry spokesman Geng Yansheng follows accusations last week by American cybersecurity company Mandiant that Chinese military-backed cyberspies infiltrated overseas networks and stole massive amounts of data from U.S. companies and other entities. China denied the allegations, and its military said it has never supported any hacking activity.

Geng told reporters at a monthly news conference that an average of 62.9 percent of the attacks on the Defense Ministry's official website and that of its newspaper, the People's Liberation Army Daily, came from the U.S.

"Like other countries, China faces a serious threat from hacking and is one of the primary victims of hacking in the world," Geng said. "Numbers of attacks have been on the rise in recent years."

Related story: Red Tape: His firm accused China of hacking the US; now he awaits the consequences

Geng attacked the Mandiant report, which blamed hacking on the People's Liberation Army's Shanghai-based Unit 61398, as "unprofessional and not in accordance with the facts." He also criticized the U.S. military's cyber command for impeding international efforts at controlling hacking.

The Mandiant report was widely praised by cybersecurity professionals interviewed by The Associated Press, who said it provided the most detailed picture yet of China's state-sponsored hacking efforts.

Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

? 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Source: http://www.nbcnews.com/technology/technolog/china-says-us-based-hackers-target-its-websites-1C8628546

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New insights into plant evolution

Feb. 28, 2013 ? New research has uncovered a mechanism that regulates the reproduction of plants, providing a possible tool for engineering higher yielding crops. In a study published today in Science, researchers from Monash University and collaborators in Japan and the US, identified for the first time a particular gene that regulates the transition between stages of the life cycle in land plants.

Professor John Bowman, of the Monash School of Biological Sciences said plants, in contrast to animals, take different forms in alternating generations -- one with one set of genes and one with two sets.

"In animals, the bodies we think of are our diploid bodies -- where each cell has two sets of DNA. The haploid phase of our life cycle consists of only eggs if we are female and sperm if we are male. In contrast, plants have large complex bodies in both haploid and diploid generations," Professor Bowman said.

These two plant bodies often have such different characteristics that until the mid-1800s, when better microscopes allowed further research, they were sometimes thought to be separate species.

Professor Bowman and Dr Keiko Sakakibara, formerly of the Monash School of Biological Sciences and now at Hiroshima University, removed a gene, known as KNOX2 from moss. They found that this caused the diploid generation to develop as if it was a haploid, a phenomenon termed apospory. The equivalent mutations in humans would be if our entire bodies were transformed into either eggs or sperm.

"Our study provides insights into how land plants evolved two complex generations, strongly supporting one theory put forward at the beginning of last century proposing that the complex diploid body was a novel evolutionary invention," Professor Bowman said.

While Professor Bowman's laboratory in the School of Biological Sciences is focused on basic research exploring the evolution and development of land plants, he said there were possible applications for the results as mutations in the gene cause the plant to skip a generation.

One goal in agriculture is apomixis, where a plant produces seeds clonally by skipping the haploid generation and thereby maintaining the characteristics, such as a high yielding hybrid, of the mother plant. Apomixis would mean crops with desirable qualities could be produced more easily and cheaply.

"Gaining a better understanding of the molecular basis of plant reproduction and the regulations of the alternation of generations could provide tools to engineer apomixis -- a breakthrough that would be highly beneficial, especially in developing countries," Professor Bowman said.

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The above story is reprinted from materials provided by Monash University, via EurekAlert!, a service of AAAS.

Note: Materials may be edited for content and length. For further information, please contact the source cited above.


Journal Reference:

  1. K. Sakakibara, S. Ando, H. K. Yip, Y. Tamada, Y. Hiwatashi, T. Murata, H. Deguchi, M. Hasebe, J. L. Bowman. KNOX2 Genes Regulate the Haploid-to-Diploid Morphological Transition in Land Plants. Science, 2013; 339 (6123): 1067 DOI: 10.1126/science.1230082

Note: If no author is given, the source is cited instead.

Disclaimer: Views expressed in this article do not necessarily reflect those of ScienceDaily or its staff.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/top_news/top_environment/~3/RADtbMBx-xQ/130301123314.htm

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China executes notorious 'Golden Triangle' drug lord

China Daily / Reuters

Drug lord Naw Kham is taken from a Chinese jail to be executed on Friday.

By Ed Flanagan, Producer, NBC News

BEIJING ? A notorious gang leader and drug lord from Myanmar was among four foreigners executed in China Friday, marking the first time Beijing has extradited, tried and put to death foreign nationals.?

Naw Kham and three accomplices from Thailand and Laos were given a lethal injection in Yunnan?s provincial capital, Kunming, late Friday afternoon.

The four were found guilty last year and sentenced Wednesday for the October 2011 hijacking of two cargo ships and the murder of 13 Chinese sailors on the Mekong River.

But Beijing?s decision to live broadcast the final moments of the men as they waited in their cells followed by their walk to waiting police cars to the execution facility has drawn criticism across China?s websphere.

The four were additionally found guilty of smuggling drugs, kidnapping and hijacking cargo ships in the ?Golden Triangle,? a section of territory that overlaps parts of Thailand, Myanmar, Vietnam and Laos that accounts for much of Asia?s opium and methamphetamines production.

Beijing contends that, while Naw Kham masterminded the hijacking of the two Chinese cargo ships, he also colluded with Thai soldiers who may have been responsible for the slaying of the sailors.?

Thai authorities are investigating nine of their soldiers alleged to be involved in the incident.

The capture of Naw Kham ? who was at the center of the region's bustling drug trade ? was a coup for Chinese police and anti-drug ministries, which reportedly spent a year tracking the infamous smuggler.

The search was unprecedented as it marked the first time that Chinese forces were seen actively searching for foreign national criminal suspects outside of China?s borders.

Task force
The importance Beijing placed on the search was underscored by a report last month by Chinese state media that revealed a task force set up to capture Naw Kham had at one point considered a controversial plan to use an unmanned drone to bomb a suspected hideout of Naw Kham?s gang in northeastern Myanmar. ??

The scheme was scrapped after the order to capture Naw Kham alive and bring him to trial was reiterated from senior leaders.

Naw Kham?s capture and subsequent trial was given significant coverage in Chinese state media. In the run up to Friday?s execution, long reports detailing the gang?s crimes, celebrating the diligent work of China?s security forces and explaining the method of execution were repeatedly played on Chinese broadcaster CCTV.

CCTV also ran two hours of live coverage leading up to the executions, showing the men?s final moments as they were led from their prison cells to execution facility. Despite rampant rumors and speculation that the state broadcaster was planning on showing the execution live, it ended its live coverage after the men were driven away.??

The magnitude of Naw Kham?s capture and execution was never underplayed, with one CCTV reporter noting that officials there were comparing Naw Kham?s case to the hunt for Osama Bin Laden.

The comparison carries an undeniable message from the country?s ruling Communist Party to its people: China can and will look out for its nationals both at home and abroad.

But many in China found the live broadcast of the men?s final moments in poor taste and an uncomfortable reminder of show executions from China?s turbulent period during the Cultural Revolution.

?Even though they are deserved to die, these criminals have dignity too,? wrote one user on China?s Twitter-like service, Weibo, ?The Cultural Revolution is back.?

?China is a country without humanity,? lamented another.

?CCTV is as cruel as these criminals,? one user bluntly noted.?

Mo Shaoping, a prominent criminal lawyer and advisor at the Central University of Finance and Economics Law School, argued that Beijing?s decision to broadcast the prisoners? final moments was less about striking a nationalist chord and more about showing how the country has improved its handling of the death penalty ? a sensitive topic for China?s leadership.

?China has made progress in how it deals with the death penalty,? Mo said. ?showing everything live helps people see that prisoners are being treated humanely in their final moments.?

Indeed, much of the commentary on CCTV as cameras rolled on Naw Kham in his cell discussed how he had been given a full doctor?s inspection and that officers in the room had made small chat and offered cigarettes to the kingpin to help him relax.

They also noted that Naw had actually gained weight and looked healthier after months under Chinese supervision.

Mo also noted that the use of lethal injection mean that potential donor organs could not be harvested from the men, addressing another common criticism of China?s previous handling of state executions.

NBC News Le Li contributed to this report.

Source: http://behindthewall.nbcnews.com/_news/2013/03/01/17145073-notorious-drug-lord-executed-by-china-over-golden-triangle-smuggling-hijackings?lite

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Order in the chaos of a cell membrane

Mar. 1, 2013 ? An explanation has been proposed for the way in which ordered structures arise in cell membranes. Scientists from the Max Planck Institute of Colloids and Interfaces in Potsdam have discovered how complex compounds of sugar and lipids -- known as glycolipids -- order themselves in cell membranes into rafts, namely small, highly organised domains. The arrangement of glycolipids on the surface of plant and animal cell membranes regulates numerous cellular processes. If errors occur in this process, diseases like PNH and BSE can arise.

Lipids, i.e. fats and fat-like substances, arise all over the human body. They are the body's most important energy storage system and are crucial structural components of cell membranes. Compounds formed from complex sugar components and fats are known as glycolipids. Those are vital communicators found in the membranes of every human cell, and constantly exchange information about the type and state of the cell. Numerous metabolic processes depend on glycolipids and their recognition. Even the immune system identifies and combats many pathogens using certain sugar structures located on the surface of the pathogen cells.

Glycosylphosphatidylinositols (GPIs) belong to the group of natural glycolipids. They are found on the surface of plant and animal cell membranes, where they appear either as free molecules or as membrane anchors for various proteins. The arrangement in clusters and their preference for denser and, in part, highly-organised micro-domains in the membrane are seen as essential for the effective functioning of a cell. These minuscule clusters are extremely important for the regulation of many cellular processes, and their malfunction can have very serious consequences. For example, it has been proven that the accumulation, missing or alteration of GPI-anchored molecules can trigger the development of serious diseases like BSE and paroxysmal nocturnal hemoglobinuria (PNH). Scientists at the Max Planck Institute of Colloids and Interfaces in Golm near Potsdam have gained new insight into how GPIs structure themselves in membranes.

Crystalline lipid areas never previously observed in membranes

It was assumed up to now that the arrangement of the GPIs in clusters and rafts was determined by the water-repelling section of the glycolipids embedded in the cell membrane. The chemical structure of the hydrophobic ends is actually responsible for strong interactions with similarly rigid neighbouring molecules. If the number of the molecules that interact with each other is big enough, rigid and partly organised domains may arise like icebergs on the surface of the ocean.

Cristina Stefaniu and her colleagues have now discovered that, in addition to the hydrophobic ends, the large GPI head groups, which contain sugar, mainly contribute to the formation of the rafts. This means that the hydrophylic part of the molecule is able to build strong interactions with the neighbouring GPI molecules. This part of the molecule is located precisely on the boundary between the membrane surface and the liquid medium. "The interactions between neighbouring GPI molecules result in the formation of crystalline orders that have not previously been observed for other membrane lipids," says Cristina Stefaniu.

Hydrogen bonds connect the hydrophylic head groups

The scientists reached this new conclusion about the order in membranes by studying a model molecule. This is a GPI fragment that was synthesised by the groups headed by Peter Seeberger and Daniel Var?n Silva and that imitates the behaviour of entire GPIs. It forms a very thin film, just one molecule thick, on the surface of the water. This so-called monolayer is the simplified model of a half cell membrane which the researchers analysed using synchrotron x-ray scattering. "Surprisingly, the highly ordered structure in the GPI monolayer is predominantly determined by the bulky hydrophilic head groups that connect through hydrogen bonds," says Stefaniu. A hydrogen bond is a relatively weak chemical bond and usually links two molecules through the bonding of a hydrogen atom from one molecule with an oxygen or nitrogen atom from the other molecule. Thus the monolayers of the GPI fragment are characterised by both the order of the hydrophilic lipid chains and the crystalline arrangement of the GPI head groups.

"The molecular lattices observed here have not yet been described for lipid monolayers," says Cristina Stefaniu. "A similar order forms in lipid bilayers if they are stored at temperatures close to zero degrees Celsius." The strong interactions between the head groups can only be disrupted and the molecular lattice destroyed through the addition of a highly concentrated urea solution, which breaks the hydrogen bonds, eliminates the strong interactions of the head groups and destroys the molecular lattice. In addition, the scientists proved that ordered clusters can arise in mixtures of the GPI fragment with typical membrane lipids, which only form unordered films. Thus, the GPIs are able to generate order in the chaos of a membrane. This special skill could be very important for the GPI interactions in real cell membranes.

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The above story is reprinted from materials provided by Max Planck Institute of Colloids and Interfaces.

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Journal Reference:

  1. Cristina Stefaniu, Ivan Vilotijevic, Mark Santer, Daniel Var?n?Silva, Gerald Brezesinski, Peter H. Seeberger. Subgel Phase Structure in Monolayers of Glycosylphosphatidylinositol Glycolipids. Angewandte Chemie International Edition, 2012; 51 (51): 12874 DOI: 10.1002/anie.201205825

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Source: http://feeds.sciencedaily.com/~r/sciencedaily/top_news/top_environment/~3/Tel7Ws9r9ic/130301051615.htm

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