Friday, May 10, 2013

Ancient Arctic was warm, wet, and green. What that says about the future.

A 1,000-foot core sample taken from a lake in Russia's northeast Arctic documents a period when the region was 14 degrees warmer than today, but with similar atmospheric CO2 ?levels.

By Pete Spotts / May 9, 2013

A NASA satellite shows the state of Arctic sea ice, seen here September 16, 2008. A 1,000-foot ice core from the Arctic's Lake E suggests that the Arctic was heavily forested 3.5 million years ago, when carbon dioxide levels were similar to today.

Goddard Space Flight Center Scientific Visualization Studio / NASA / Reuters / File

Enlarge

Working with a continuous record of Arctic climate reaching back 3.6 million years, researchers have documented a period when the region was significantly warmer and wetter than it is today and when the atmosphere's inventory of carbon dioxide was comparable to today's levels.

Skip to next paragraph

' + google_ads[0].line2 + '
' + google_ads[0].line3 + '

'; } else if (google_ads.length > 1) { ad_unit += ''; } } document.getElementById("ad_unit").innerHTML += ad_unit; google_adnum += google_ads.length; return; } var google_adnum = 0; google_ad_client = "pub-6743622525202572"; google_ad_output = 'js'; google_max_num_ads = '1'; google_feedback = "on"; google_ad_type = "text"; // google_adtest = "on"; google_image_size = '230x105'; google_skip = '0'; // -->

The period the team has analyzed covers the first 1.4 million years of the record, when the region's climate shifted from warm and wet to conditions that signaled the start of ice ages.

This period is of interest in part because the warmth persisted despite periodic shifts in Earth's orbit that reduced the intensity of sunlight reaching the region.

Temperatures were high enough ? about 14 degrees warmer than today in the warmest month of the summer ? to suggest that the climate system is more sensitive to small changes in greenhouse-gas concentrations than the sensitivity estimates included in some climate models.

If that's the case, as other paleoclimate studies have indicated, the models may be underestimating the amount of warming likely to result from increasing atmospheric CO2?concentrations, the scientists say.

The period also is of interest because it holds clues about the factors that drove climate from prolonged warmth into a cycle of ice ages ? factors that will help researchers understand the role natural variability plays in the region's climate and where climatic ?tipping points? may lie.

The work ?identifies for the first time a long, continuous story of that history from the Arctic and what I call the Arctic borderlands,? says Julie Brigham-Grette, a geologist at the University of Massachusetts at Amherst who focuses on the Arctic's ancient climate, referring to adjacent regions. Dr. Brigham-Grette is the lead author of a formal report of the results, which are being published in Friday's issue of the journal Science.

The research was conducted by a team of 16 scientists from Russia, the US, Germany and Sweden.

The evidence is captured in a 1,034-foot core sample the team drew from the bottom of Lake El'gygytgyn, known informally as Lake E. It formed 3.6 billion years ago after a meteor punched a crater in Russia's northeastern Arctic. The crater filled to form a lake 7 miles across and some 560 feet deep. The area around the lake managed to remain ice free during the ebb and flow of continental ice sheets during the Pleistocene ice ages, allowing sediment layers ? and the pollen and other climate indicators they contain ? to build up uninterrupted for the last 3.56 million years.

The team published initial results from the Lake E core last year, focusing on the Pleistocene. This latest effort focuses on the climate from the earlier, mid Pliocene through the onset of the glacial cycles.

Source: http://rss.csmonitor.com/~r/feeds/science/~3/zH-NCdZuyRc/Ancient-Arctic-was-warm-wet-and-green.-What-that-says-about-the-future

world peace lakers colorectal cancer metta neil diamond kashi orange crush harden

Newest Ford C-Max comes with a plug (Providence Journal)

Share With Friends: Share on FacebookTweet ThisPost to Google-BuzzSend on GmailPost to Linked-InSubscribe to This Feed | Rss To Twitter | Politics - Top Stories Stories, News Feeds and News via Feedzilla.

Source: http://news.feedzilla.com/en_us/stories/politics/top-stories/304407166?client_source=feed&format=rss

Justin Bieber Anne Frank will ferrell coachella zack greinke zack greinke kermit gosnell jackie robinson

Moving Mother's Day Ad From Google Is The Perfect Present

It's Mother's Day in the US this Sunday and to celebrate Google has released yet another?schmaltzy ad.

Using the search engine giant's usual method of using its own products to drive the video's slushy narrative, Here's To The Moms, raises a bouquet of flowers and a box of chocolates to all the amazing mums out there.

Created by agency Whirled, the one-minute commercial features children thanking their mothers for all the special things they do - from giving birth to just simply being there.

And just to add a little spice, they have even padded the ad out with various YouTube clips of moms doing some amazing things, including a funny video of a mum riding the SlingShot with her seven-year-old son and an even funnier clip of a 94-year-old grandma dancing dubstep.

Of course, it's not the first time Google has tried to makes its audience all misty-eyed, but this is certainly one of the best.?

Check it out below!

Source: http://feedproxy.google.com/~r/viralvideochart/mememachine/~3/2UNtEOSYlec/moving-mothers-day-ad-from-google-is-the-perfect-present.html

Notre Dame Football Schedule detroit tigers Tsunami Lil Reese Hurricane Sandy Nyc Saanvi Venna vikings

Thursday, May 9, 2013

YouTube Adds Paid Channel Subscriptions

YouTube Adds Paid Channel Subscriptions
YouTube will let you pay to subscribe to channels with a new pilot program that includes a limited number of channel partners for now. The company listed Jim Henson Family TV and Ultimate Fighting Championship as initial members.

Source: http://www.wired.com/gadgetlab/2013/05/youtube-adds-paid-channel-subscriptions/

new dark knight rises trailer khloe and lamar oklahoma city thunder sunoco titanic ii babe ruth new jersey nets

Saturday, May 4, 2013

New mechanism discovered in meiosis: How modification of an enzyme governs critical processes in sexual reproduction

May 3, 2013 ? The Research Group headed by molecular biologist Andrea Pichler from the Max Planck Institute of Immunobiology and Epigenetics in Freiburg has made an important discovery in meiosis research. Pichler and her group have identified a new mechanism that plays an important role in meiosis.

Starting point of the research

Meiosis, also called reductional division, is a key process in sexual reproduction. It shuffles parental genetic material and thus guarantees genetic variety.

In order to control various biological processes, cells are able to selectively alter properties of their proteins, such as their lifespan, activity level, binding partners, or localization of the proteins. This is accomplished, for example, by attaching one or more Small Ubiquitin-like Modifier (SUMO) proteins. This takes place in three sequential enzyme-dependent steps. Scientists have assumed that the enzyme for step 2 was solely an intermediate.

The breakthrough

As the scientists in Freiburg have now discovered, the step-2 enzyme is itself modified by the SUMO protein and thereby alters how it functions. The surprising effect: the conventional activity of the enzyme is switched off by this change and instead, a new function gained. It works together with the activated, unaltered enzyme in the formation of SUMO chains. If this effect is blocked, there are serious consequences: the protein structure (synaptonemal complex) that forms between the homologous chromosomes can no longer be established.

The researchers' new insights

A tiny amount -- less than one percent -- of the SUMO-modified step-2 enzyme is sufficient to form a normal protein structure (left image). Researcher Helene Klug from Pichler's team: "The smallest amount of the altered enzyme together with the unmodified enzyme is sufficient to form an activated complex, which then carries out the meiosis specific SUMO modifications."

"In the beginning, the results of the biological and biochemical experiments were completely contradictory, although the data were absolutely sound. We were therefore convinced that both sets of observations were correct. Explaining this contradiction led us then to the new mechanism," according to Pichler, who heads the study. In extensive and complicated biochemical experiments, the researchers were additionally able to reveal, for the first time, how this enzyme complex carries out the formation of SUMO chains.

After fifty years of research on the synaptonemal complex, these new insights are setting a new course: "This is the first time we can study the loss of the synaptonemal complex with practically no secondary effects and we hope to unveil its secret. That allows us to investigate the consequences for meiosis and thus for development of the gametes," say Franz Klein and Martin Xaver, collaborators and meiosis researchers at the Max F. Perutz Laboratories in Vienna.

Pichler and her team were already able to demonstrate in 2008 that self-tagging by the step-2 enzyme in mammalian cells has an influence on precisely which proteins are tagged with SUMO. In order to uncover the biological function for this form of regulation, the research team switched to baker's yeast (Saccharomyces cerevisiae), a simpler organism. "Now that we know where we need to search, we also want to switch back again to the mammalian system and investigate the role of this enzyme regulation more closely there," says Pichler. "In addition, we want to better understand the function of the discovered baker's yeast enzyme complex in the meiotic chromosomal structure."

Share this story on Facebook, Twitter, and Google:

Other social bookmarking and sharing tools:


Story Source:

The above story is reprinted from materials provided by Max-Planck-Gesellschaft.

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


Journal Reference:

  1. Helene Klug, Martin Xaver, Viduth?K. Chaugule, Stefanie Koidl, Gerhard Mittler, Franz Klein, Andrea Pichler. Ubc9 Sumoylation Controls SUMO Chain Formation and Meiotic Synapsis in Saccharomyces cerevisiae. Molecular Cell, 2013; DOI: 10.1016/j.molcel.2013.03.027

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

Disclaimer: This article is not intended to provide medical advice, diagnosis or treatment. Views expressed here do not necessarily reflect those of ScienceDaily or its staff.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/top_news/top_environment/~3/fEb4EcFpvFM/130503094133.htm

the beach Fear Airport Terminal easter bunny easter april fools pranks atlanta braves

Friday, May 3, 2013

Medicaid improved mental health for uninsured (The Arizona Republic)

Share With Friends: Share on FacebookTweet ThisPost to Google-BuzzSend on GmailPost to Linked-InSubscribe to This Feed | Rss To Twitter | Politics - Top Stories Stories, News Feeds and News via Feedzilla.

Source: http://news.feedzilla.com/en_us/stories/politics/top-stories/302892335?client_source=feed&format=rss

Thanksgiving Day cooking a turkey toysrus how to carve a turkey ipad 2 wal mart happy thanksgiving

Women's groups decry appeal on morning-after pill

WASHINGTON (AP) ? The Obama administration's decision to appeal a court order lifting age limits on purchasers of the morning-after pill set off a storm of criticism from reproductive rights groups, who denounced it as politically motivated and a step backward for women's health.

"We are profoundly disappointed. This appeal takes away the promise of all women having timely access to emergency contraception," Susannah Baruch, Interim President & CEO of the Reproductive Health Technologies Project, said in a statement late Wednesday.

"It is especially troubling in light of the Food and Drug Administration's move yesterday to continue age restrictions and ID requirements, despite a court order to make emergency contraception accessible for women of all ages. Both announcements, particularly in tandem, highlight the administration's corner-cutting on women's health," Baruch said. "It's a sad day for women's health when politics prevails."

The FDA on Tuesday had lowered the age at which people can buy the Plan B One-Step morning-after pill without a prescription to 15 ? younger than the current limit of 17 ? and decided that the pill could be sold on drugstore shelves near the condoms, instead of locked behind pharmacy counters. It appeared to be a stab at compromise that just made both sides angrier.

After the appeal was announced late Wednesday, Terry O'Neill, president of the National Organization for Women, said, "The prevention of unwanted pregnancy, particularly in adolescents, should not be obstructed by politicians." She called it a "step backwards for women's health."

Last week, O'Neill noted, President Barack Obama was applauded when he addressed members of Planned Parenthood and spoke of the organization's "core principle" that women should be allowed to make their own decisions about their health.

"President Obama should practice what he preaches," O'Neill said.

In appealing the ruling Wednesday, the administration recommitted itself to a position Obama took during his re-election campaign that younger teens shouldn't have unabated access to emergency contraceptives, despite the insistence by physicians groups and much of his Democratic base that the pill should be readily available.

The Justice Department's appeal responded to an order by U.S. District Judge Edward Korman in New York that would allow girls and women of any age to buy not only Plan B but its cheaper generic competition as easily as they can buy aspirin. Korman gave the FDA 30 days to comply, and the Monday deadline was approaching fast.

In its filing, the Justice Department said that Korman exceeded his authority and that his decision should be suspended while that appeal is under way, meaning only Plan B One-Step would appear on drugstore shelves until the case is finally settled. If Korman's order isn't suspended during the appeals process, the result would be "substantial market confusion, harming FDA's and the public's interest" as drugstores receive conflicting orders about who's allowed to buy what, the Justice Department concluded.

Reluctant to get drawn into a messy second-term spat over social issues, White House officials insisted Wednesday that both the FDA and the Justice Department were acting independently of the White House in deciding how to proceed. But the decision to appeal was certain to irk abortion-rights advocates who say they can't understand why a Democratic president is siding with social conservatives in favor of limiting women's reproductive choices.

Current and former White House aides said Obama's approach to the issue has been heavily influenced by his experience as the father of two school-age daughters. Obama and Health and Human Services Secretary Kathleen Sebelius have also questioned whether there's enough data available to show the morning-after pill is safe and appropriate for younger girls, even though physicians groups insist that it is.

Rather than take matters into his own hands, the Justice Department argued to the 2nd U.S. Circuit Court of Appeals that Korman should have ordered the FDA to reconsider its options for regulating emergency contraception. The court cannot overturn the rules and processes that federal agencies must follow "by instead mandating a particular substantive outcome," the appeal states.

The FDA actually had been poised to lift all age limits and let Plan B sell over the counter in late 2011, when Sebelius overruled her own scientists. Sebelius said some girls as young as 11 were physically capable of bearing children but shouldn't be able to buy the pregnancy-preventing pill on their own.

Sebelius' move was unprecedented, and Korman had blasted it as election-year politics ? meaning he was overruling not just a government agency but a Cabinet secretary.

More than a year later, neither side in the contraception debate was happy with the FDA's surprise twist, which many perceived as an attempt to find a palatable middle ground between imposing an age limit of 17 and imposing no limit at all.

Any over-the-counter access marks a long-awaited change, but it's not enough, said Dr. Cora Breuner of the American Academy of Pediatrics, which supports nonprescription sale of the morning-after pill for all ages.

"We still have the major issue, which is our teen pregnancy rate is still too high," Breuner said.

Even though few young girls likely would use Plan B, which costs about $50 for a single pill, "we know that it is safe for those under 15," she said.

Most 17- to 19-year-olds are sexually active, and 30 percent of 15- and 16-year-olds have had sex, according to a study published last month by the journal Pediatrics. Sex is much rarer among younger teens. Likewise, older teens have a higher pregnancy rate, but that study also counted more than 110,000 pregnancies among 15- and 16-year-olds in 2008 alone.

Social conservatives were outraged by the FDA's move to lower the age limits for Plan B ? as well as the possibility that Korman's ruling might take effect and lift age restrictions altogether.

"This decision undermines the right of parents to make important health decisions for their young daughters," said Anna Higgins of the Family Research Council.

If a woman already is pregnant, the morning-after pill has no effect. It prevents ovulation or fertilization of an egg. According to the medical definition, pregnancy doesn't begin until a fertilized egg implants itself into the wall of the uterus. Still, some critics say Plan B is the equivalent of an abortion pill because it may also be able to prevent a fertilized egg from attaching to the uterus, a contention that many scientists ? and Korman, in his ruling ? said has been discredited.

___

Associated Press writer Pete Yost contributed to this report.

Source: http://news.yahoo.com/womens-groups-decry-appeal-morning-pill-071825445.html

bohemian rhapsody bohemian rhapsody spike lee carson daly heejun han donovan mcnabb donovan mcnabb