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Minggu, 09 November 2008

Studies: Vitamin pills don't prevent heart disease

NEW ORLEANS – Vitamins C and E — pills taken by millions of Americans — do nothing to prevent heart disease in men, one of the largest and longest studies of these supplements has found.

Vitamin E even appeared to raise the risk of bleeding strokes, a danger seen in at least one earlier study.

Besides questioning whether vitamins help, "we have to worry about potential harm," said Barbara Howard, a nutrition scientist at MedStar Research Institute of Hyattsville, Md.

She has no role in the research but reviewed and discussed it Sunday at an American Heart Association conference. Results also were published online by the Journal of the American Medical Association.

About 12 percent of Americans take supplements of C and E despite growing evidence that these antioxidants do not prevent heart disease and may even be harmful.

Male smokers taking vitamin E had a higher rate of bleeding strokes in a previous study, and several others found no benefit for heart health.

As for vitamin C, some research suggests it may aid cancer, not fight it. A previous study in women at high risk of heart problems found it did not prevent heart attacks.

Few long-term studies have been done. The new one is the Physicians Health Study, led by Drs. Howard Sesso and J. Michael Gaziano of Harvard-affiliated Brigham and Women's Hospital in Boston.

It involved 14,641 male doctors, 50 or older, including 5 percent who had heart disease at the time the study started in 1997. They were put into four groups and given either vitamin E, vitamin C, both, or dummy pills. The dose of E was 400 international units every other day; C was 500 milligrams daily.

After an average of eight years, no difference was seen in the rates of heart attack, stroke or heart-related deaths among the groups.

However, 39 men taking E suffered bleeding strokes versus only 23 of the others, which works out to a 74 percent greater risk for vitamin-takers.

The study was funded by the National Institutes of Health and several vitamin makers. Results were so clear that they would be unlikely to change if the study were done in women, minorities, or with different formulations of the vitamins, Howard said.

"In these hard economic times, maybe we can save some money by not buying these supplements," she said.

A second study found that vitamins B-12 and B-9 (folic acid) did not prevent heart disease either, supporting the results of previous trials. That study involved more than 12,000 heart attack survivors and was led by Dr. Jane Armitage of the University of Oxford in England.

___

On the Net:

JAMA: http://jama.ama-assn.org/

Heart meeting: http://www.americanheart.org/
news source of www.news.yahoo.com
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Study: Wider cholesterol drug use may save lives

NEW ORLEANS – People with low cholesterol and no big risk for heart disease had dramatically lower rates of heart attacks, death and stroke if they took the cholesterol pill Crestor, a large study found.

The results, reported Sunday at an American Heart Association conference, were hailed as a watershed event in heart disease prevention. Doctors said the study might lead as many as 7 million more Americans to consider taking cholesterol-lowering statin drugs, sold as Crestor, Lipitor, Zocor or in generic form.

"This takes prevention to a whole new level, because it applies to patients who we now wouldn't have any evidence to treat," said Dr. W. Douglas Weaver, a Detroit cardiologist and president of the American College of Cardiology.

The study also gives the best evidence yet for using a new test to identify people who may need treatment, according to a statement from Dr. Elizabeth Nabel, director of the National Heart, Lung and Blood Institute. The new research will be considered by experts reviewing current guidelines.

However, some doctors urged caution. Crestor gave clear benefit in the study, but so few heart attacks and deaths occurred among these low-risk people that treating everyone like them in the United States could cost up to $9 billion a year — "a difficult sell," one expert said.

About 120 people would have to take Crestor for two years to prevent a single heart attack, stroke or death, said Stanford University cardiologist Dr. Mark Hlatky. He wrote an editorial accompanying the study published online by the New England Journal of Medicine.

"Everybody likes the idea of prevention. We need to slow down and ask how many people are we going to be treating with drugs for the rest of their lives to prevent heart disease, versus a lot of other things we're not doing" to improve health, Hlatky said.

Statins are the world's top-selling drugs. Until this study, all but Crestor have already been shown to cut the risk of heart attacks and death in people with high LDL, or bad cholesterol.

But half of all heart attacks occur in people with normal or low cholesterol, so doctors have been testing other ways to predict who is at risk.

One is high-sensitivity C-reactive protein, or CRP for short. It is a measure of inflammation, which can mean clogged arteries as well as less serious problems, such as an infection or injury. Doctors check CRP with a blood test that costs about $80 to have done.

A co-inventor on a patent of the test, Dr. Paul Ridker of Harvard-affiliated Brigham and Women's Hospital in Boston, led the new study. It involved 17,802 people with high CRP and low LDL cholesterol (below 130) in the U.S. and 25 other countries.

One-fourth were black or Hispanic, and 40 percent were women — important because previous statin studies have included few women. Men had to be 50 or older; women, 60 or older. None had a history of heart problems or diabetes.

They were randomly assigned to take dummy pills or Crestor, the strongest statin on the market, made by British-based AstraZeneca PLC. Neither participants nor their doctors knew who was taking what.

The study was supposed to last five years but was stopped in March, after about two years, when independent monitors saw that those taking Crestor were faring better than the others.

Full results were announced Sunday. Crestor reduced a combined measure — heart attacks, strokes, heart-related deaths or hospitalizations, or the need for an artery-opening procedure — by 44 percent.

"We reduced the risk of a heart attack by 54 percent, the risk of a stroke by 48 percent and the chance of needing bypass surgery or angioplasty by 46 percent," Ridker said.

Looked at another way, there were 136 heart-related problems per year for every 10,000 people taking dummy pills versus 77 for those on Crestor.

Remarkably, every single subgroup benefited from the drug.

"If you're skinny it worked, if you're heavy it worked. If you lived here or there, if you smoked, it worked," Ridker said.

AstraZeneca paid for the study, and Ridker and other authors have consulted for the company and other statin makers.

One concern: More people in the Crestor group saw blood-sugar levels rise or were newly diagnosed with diabetes.

Crestor also has the highest rate among statins of a rare but serious muscle problem, so there are probably safer and cheaper ways to get the same benefits, said Dr. Sidney Wolfe of the consumer group Public Citizen.

"It is highly unlikely that (the benefits are) specific to Crestor," said Wolfe, who has campaigned against the drug in the past.

Crestor costs $3.45 a day versus less than a dollar for generic drugs.

Drs. James Stein and Jon Keevil of the University of Wisconsin-Madison used federal health statistics to project that 7.4 million Americans, or more than 4 percent of the adult population, are like the people in this study.

Treating them all with Crestor would cost $9 billion a year and prevent about 30,000 heart attacks, strokes or deaths, they calculate.

"That's pretty costly. This would be a very difficult sell" unless a person also had family history or other heart disease risk factors, said Dr. Thomas Pearson of the University of Rochester School of Medicine and Dentistry.

Pearson was co-chairman of a joint government-heart association panel that wrote current guidelines for using CRP tests to guide treatment.

Researchers do not know whether the benefits seen in the study were due to reducing CRP or cholesterol, since Crestor did both.

This study and two other government-sponsored ones reported on Sunday "provide the strongest evidence to date" for testing C-reactive protein, and adding it to traditional risk measures could identify millions more people who would benefit from treatment, Nabel's statement says.

U.S. Crestor prescriptions totaled $420 million in the third quarter of this year, up 23 percent from a year earlier. In the rest of the world, third quarter sales were $520 million, up 33 percent.

Sales have been rising even though two statins — Zocor and Pravachol — are now available in generic form.

___

On the Net:

New England Journal: http://www.nejm.org

Heart conference: http://www.americanheart.org

Government: http://www.nhlbi.nih.gov/health/dci/Diseases/Cad/CAD_WhatIs.html
news source of www.news.yahoo.com
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Sabtu, 08 November 2008

The aircraft mission

The agencies involved in this exciting project are the United States National Science Foundation, the British Antarctic Survey, the German Federal Institute for Geosciences and Natural Resources (BGR), Australian Antarctic Division, Chinese Arctic and Antarctic Administration and the Japanese National Institute of Polar Research. Nine aircraft are involved in this ambitious project. In addition to the two specially equipped science aircraft from UK and US, seven others will support the project by transporting people, fuel, equipment and supplies to both field camps.

Fuel to AGAP South will be moved by air and by overland traverse from where it is currently stockpiled. An overland traverse will head out of South Pole arriving at AGAP South on 10th December. Air drops using a C17 are planned for four dates in November to bring additional fuel to AGAP North.
2-3 December 2008: GAMBIT. The BAS twin otter survey aircraft will move to AGAP-North. The survey team will also move to AGAP-North in a BAS support Twin Otter (VPF AZ). The BAS Twin Otter survey aircraft will remain at AGAP-North for 37 days maximum. The goal is to complete 43 survey flights. If weather and field conditions are good flights could take as little as 29 days.

11 December: The USAP aircraft will transfer to AGAP-South to be in place when the early GAMBIT science team arrives.

17 December 2008: The USAP utility twin otter aircraft begins its deployment of 25 seismic stations for the GAMSEIS project. Of the 25 sites to be visited, 15 stations are to be new installations; 10 existing stations are to be serviced (~ 3 hrs per station to be serviced). The stations to be serviced actually take more ground time than the “to be installed” stations. This process includes removing the battery data logger box from the ice, brought back for service at AGAP-South and put into another box install at another site. Sixteen flight days with a double crew are targeted for this effort.







17 December 2008 – 10 January 2009: GAMBIT- USAP Twin Otter aircraft begins flying at AGAP-South. Fifty-four flights are necessary to complete the science program. Assuming a production rate of 1.85 flights per day from the Lake Vostok survey, 39 flights are likely to be completed in the 21 day planned flight operation window. Any option to begin survey flights sooner will facilitate the completion of the science program. The USAP Survey aircraft will conduct flights that require refuelling at a location know as AGO-1 and AGAP-North.

5-10 January 2009: The BAS Survey Twin Otter and team will work from AGAP-South. If fuel is available at AGO-3 the BAS Survey Otter will acquire the geophysical lines over the northern Recovery Lakes at the end of the season. The airframe will transfer back to McMurdo via AGO-1.

10 January 2009: the USAP Survey aircraft will transfer back to McMurdo where the geophysical equipment will be removed. The aircraft will be released to other projects on 16 January.

16 January 2009: The BAS aircraft will depart McMurdo via Pole for Patriot Hills and Rothera on. The survey team will depart with NSF through New Zealand.















news source of http://www.antarctica.ac.uk
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Kamis, 06 November 2008

TCU, Utah to play BCS elimination game

SALT LAKE CITY – Welcome to the BCS Buster playoffs. When No. 11 TCU visits No. 10 Utah on Thursday night, the winner is assured of staying alive for at least another week in the Bowl Championship Series sweepstakes. The loser can start making other postseason plans.

"It's everything you want. It's what you coach for," TCU coach Gary Patterson said. "Now we are in a situation where you see in three hours who can score one more point."

Most other seasons, the focus on this game would be the Mountain West Conference championship. The Utes (9-0, 5-0) and Horned Frogs (9-1, 6-0) are the only teams left without a league loss and the winner will have the inside track for the outright conference title.

But both teams are also in the top 12 of the BCS, one of the qualifying benchmarks for the top tier of bowls. The series only hands out one berth to a non-BCS conference school, and with Boise State of the Western Athletic Conference still in contention, a loss at this point would end any hope.

"It's like you have finals and then you've got vacation," Patterson said. "All you think about is you've got to get to finals to get vacation. Vacation is the No. 1 priority, but you know what? Vacation is not going to be a lot of fun if you flunk all your finals."

TCU hasn't flunked anything this season. The Horned Frogs' only loss was 35-10 to Oklahoma, which is respectable considering the sixth-ranked Sooners average almost 50 points per game. The only other team to hold Oklahoma to so few points was Texas in a 45-35 win for the Longhorns.

The Frogs have already taken out one potential BCS Buster with a 32-7 win over BYU three weeks ago. TCU held BYU to just 297 yards of offense, including 23 yards rushing.

"They're just tearing it up on defense. I don't know if I've seen a defense play as well as they have," Utah coach Kyle Whittingham said. "You name it, they're doing it on defense. That is very impressive, what they've been able to do."

Utah is the original BCS Buster and is trying to be the first school to sneak in one of the big-money games twice. TCU is trying to be the first to earn a berth despite losing a game.

The speculation about who could be this year's BCS Buster has been building throughout the season, especially after TCU's win over BYU.

Although the BCS bylaws are complicated, Utah's route to getting there is simple. Stay unbeaten and the Utes, who are No. 8 in the BCS standings, can get the automatic berth.

"We control what we can control. Go out and win football games and let the rest take care of itself," quarterback Bryan Johnson said.

Utah is expecting Rice-Eccles Stadium to be packed Thursday night, despite a winter storm that hit Salt Lake City and covered the foothills above campus in white. Utah is encouraging fans to wear black and will hand out 35,000 black rally towels.

The Utes are also expected to debut black uniforms instead of their usual red. It's a move that didn't work well for Georgia earlier this season when Alabama beat the black-clad Bulldogs 41-30, but the Utes are trying to create a special atmosphere for the game.

Although with everything on the line, wardrobes won't matter much.

"It's pretty much the conference championship game, if you think about it," TCU linebacker Jason Phillips said. "It's definitely a lot of fun to play when you know there's a lot of people watching and you have a big audience."

TCU has one opponent left after Utah and can clinch at least a share of the Mountain West title with a win Thursday. The Frogs don't play again until they host Air Force on Nov. 22.

Utah still has San Diego State next week, then No. 17 BYU at home in a rivalry game that will be even bigger if there are still BCS implications.

"I don't even think about the BCS. We're just trying to find a way to beat TCU," Whittingham said. "You only worry about what you can control and we obviously have no control over that other than try to win games each week."

news source of www.news.yahoo.com
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Signs of Late Volcanism Seen on Moon

Volcanic activity on the far side of the moon may have lasted longer than previously thought, recent images from a Japanese lunar satellite suggest.

The finding, detailed in the Nov. 7 issue of the journal Science, could help shed light on the moon's formation and evolution.

Scientists think that the moon formed when a rogue planet about the size of Mars crashed into Earth and ripped out a chunk of the planet's molten mantle. Some of the material from that chunk began to orbit Earth, gradually cooling over millions of years to form the moon.
The lunar surface is dead now, but over the millions of intervening years since it formed, it experienced bouts of volcanic activity.
Scientists have studied lunar volcanic features, the most common of which are mare (dark "seas") basalts, from orbit to determine when they formed. Radiogenic dating is the best way to date mineral deposits, but samples from the moon's surface are limited, and come only from a few locations on the moon's nearside.
Another way to estimate the age of volcanic features is to count the number of impact craters they have: the younger the feature, the fewer the craters that mark its surface.
A group of researchers did just that for two areas on the far side of the moon, the South Pole-Aitken (SPA) basin and Mare Moscoviense, with images from the Terrain Camera aboard the Japanese polar lunar orbiter SELENE (KAGUYA). The orbiter launched on Sept. 14, 2007, and began its mission observing the moon's surface on Dec. 21.
Most mare volcanism ceased on the moon's far side about 3 billion years ago, but at a few locations, Junichi Haruyama of the Japan Aerospace Exploration Agency and his colleagues estimated that mare deposits were only about 2.5 billion years old, suggesting that some episodic volcanism continued after the main thrust had ended.

Volcanism also continued on the nearside, apparently lasting longer than on the far side, the researchers found. In Oceanus Procellarum, for example, basalts have been estimated to be a young 1 billion years old.
The difference in the termination of volcanic activity on the two sides of the moon could be related to a thicker crust on the far side, or fewer heat-producing radioactive elements on the far side compared to the near side, the authors said.

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Ancient cave yields clues to Chinese history

WASHINGTON – A stalagmite rising from the floor of a cave in China is providing clues to the end of several dynasties in Chinese history. Slowly built from the minerals in dripping water over 1,810 years, chemicals in the stone tell a tale of strong and weak cycles of the monsoon, the life-giving rains that water crops to feed millions of people.

Dry periods coincided with the demise of the Tang, Yuan and Ming dynasties, researchers report in Friday's edition of the journal Science.

In addition, the team led by Pingzhong Zhang of Lanzhou University in China noted a change in the cycles around 1960 which they said may indicate that greenhouse gases released by human activities have become the dominant influence on the monsoon.

The Wanxiang Cave is in Gansu Province, a region where 80 percent of the rainfall occurs between May and September.

Chemical concentrations in the stalagmite indicate a series of fluctuations lasting from one to several centuries and roughly similar to records of the Little Ice Age, Medieval warm period and Dark Age cold period recorded in Europe.

There were decade-long fluctuations between A.D. 190 and 530, the end of the Han Dynasty and most of the Era of Disunity, the researchers said. From 530 to 850 the monsoon declined, covering the end of the Era of Disunity, the Sui Dynasty and most of the Tang Dynasty.

The monsoon remained weak, with another sharp drop between 910 and 930, then it rose sharply over 60 and remained strong until 1020.

The researchers found that after 1020 the monsoon varied but was generally strong until a sharp drop between 1340 and 1360: the mid 14th-century monsoon weakening. It stayed weak, with substantial fluctuation, until a sharp increase between 1850 and 1880.

According to the researchers, the 9th-century dry period contributed to the decline of the Tang Dynasty and the Mayans in Mesoamerica. It also may have contributed to the lack of unity during the Five Dynasties and Ten Kingdoms period, they said.

The following strengthening of the monsoon may have contributed to the rapid increase in rice cultivation, the dramatic increase in population, and the general stability at the beginning of the Northern Song Dynasty, they suggested, adding that the end of the Yuan and the end of the Ming are both characterized by unusually weak summer monsoons.

The research was supported by the National Science Foundations of the United States and China, the Gary Comer Science and Education Foundation, the Ministry of Science and Technology of China and the Chinese Academy of Sciences.
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Male hormone patch increases libido in women

NEW YORK (Reuters Health) – Postmenopausal women with low sexual desire levels reported improved sexual function after they were treated with a patch in which the male hormone testosterone was applied through the skin, a clinical study has found. However, more studies are needed to confirm the safety of this treatment.

"Many postmenopausal women continue to be sexually active despite a high level of sexual dissatisfaction, engaging in sexual activity to please their partner and maintain domestic harmony," lead author Dr. Susan R. Davis, at Monash University in Prahran, Australia, and fellow researchers note.

While testosterone has proved effective for increasing libido among postmenopausal women who are on hormone replacement therapy, the effectiveness of this approach in women who are not taking estrogen is unknown.

There has also been some concern that testosterone administered without being tempered by another hormone may adversely affect circulating lipid (fat) levels, glucose (sugar) metabolism or breast tissue.

The APHRODITE trial (A Phase III Research Study of Female Sexual Dysfunction in Women on Testosterone Patch without Estrogen), conducted at 65 centers in Australia, Europe, and North America, included postmenopausal women who reported significant loss of sexual desire that was causing personal distress.

In this study, 267 women were assigned to receive transdermal testosterone at 150 g/day, 267 were treated with the patch testosterone at 300 g/day, and a third group of 277 women received placebo. The patches (Intrinsa, Procter & Gamble) were applied to the abdomen twice a week. The group assignments were all random and neither the patients nor the clinicians knew what each group was given.

At 24 weeks, an increase in the frequency of satisfying sexual episodes was significantly greater in the group receiving the 300 g testosterone dose than the placebo group, but not significantly greater in the group that received the lower dose of testosterone.

Both testosterone groups also had significantly increased scores for sexual desire and decreases in personal distress.

"The increase in the frequency of satisfying sexual episodes was modest but appeared to be clinically meaningful," the authors comment.

The most common hormone side effect was an increase in unwanted hair growth in the higher-dose group. The frequency and severity of other side effects events -- acne, baldness, and voice deepening -- did not differ between the treatment groups. There were no clinically relevant changes in blood lipid levels, glucose metabolism or liver function in any of the groups.

Of concern was the diagnosis of breast cancer in four women in the testosterone groups. The authors note that one of the subjects was symptomatic, with a bloody nipple discharge prior to study entry, and another was diagnosed after 4 months of treatment. The other two were diagnosed after 52 weeks and 104 weeks of treatment.

"Additional data are needed to assess the long-term safety of testosterone use in women with estrogen depletion," the researchers conclude.

SOURCE: The New England Journal of Medicine, November 6, 2008.
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Selasa, 04 November 2008

Fearsome T-Rex was one nosy dinosaur

PARIS (AFP) – Tyrannosaurus Rex could sniff out distant prey even at night, yet another reason the flesh-ripping predator reigned supreme as king of the dinosaurs, according to a study published on Wednesday.
Earlier research had shown that the towering T-rex could see better than an eagle and would have been able to run down the fastest of humans.
The new study now unveils a previously unheralded weapon in the fearsome theropod's arsenal: a dangerously keen sense of smell.
Any trace of the brains of dinosaurs, which roamed Earth for tens of millions of years up to the end of the Cretaceous Period 65 million years ago, has long since disappeared.
But a trio of scientists led by Darla Zelenitsky at the University of Calgary in Alberta, Canada found a novel way to gage the sniffing prowess of T-rex and a couple dozen other meat-eating dinosaurs and primitive birds.
By examining fossil skull bones, the researchers were able to measure the size of indentations made by olfactory bulbs, the part of the brain associated with the sense of smell.
"Living birds and mammals that rely heavily on smell to find meat have large olfactory bulbs," Zelenitisky said in a statement.
The same animals also tend to prowl for prey at night, and cover vast areas, he added.
Of all the dinosaurs examined, the T-rex had the largest olfactory bulb relative to its overall size.
The study, published in the British journal Proceedings of the Royal Society B, also found that primitive birds had high-performance odor detectors, challenging a long-held assumption about the evolution of winged vertebrates.
"It has been previously suggested that smell had become less important than eye sight in the ancestors of birds, but we have shown that this wasn't so," said Zelenitsky.
Archaeopteryx, for example, which took to the skies during the Jurassic Period some 150 million years ago, had a sense of smell comparable to meat-eating dinosaurs along with excellent eye sight, the study said.
Somewhere along the way birds began to lose their sense of smell, but the decline probably happened far later than previously thought, the study concludes.

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Japanese clone mouse from frozen cell, aim for mammoths

TOKYO (AFP) – Japanese scientists said Tuesday they had created a mouse from a dead cell frozen for 16 years, taking a step in the long impossible dream of bringing back extinct animals such as mammoths.
Scientists at the government-backed research institute Riken used the dead cell of a mouse that had been preserved at minus 20 degrees Celsius (minus 4 degrees Fahrenheit) -- a temperature similar to frozen ground.
The scientists hope that the first-of-a-kind research will pave the way to restore extinct animals such as the mammoth.
The findings were published in the Proceedings of the National Academy of Sciences in the United States.
The scientists extracted a cell nucleus from an organ of the dead mouse and planted it into an egg of another mouse which was alive, leading to the birth of the cloned mouse, the researchers said.
"The newly developed technology of nucleus transfer greatly improved the possibility of reviving extinct animals," the research team led by Teruhiko Wakayama said in a statement.
"Even though reviving extinct animals is often described in films and novels -- such as in Michael Crichton's 'Jurassic Park' -- it had in reality been impossible," they said.
Cells from dead bodies have previously been useless as they are ruined in the freezing process. But Wakayama's team discovered a way to extract a nucleus intact from a frozen cell by grinding cell tissues into multiple pieces.
The cloned mouse was able to reproduce with a female mouse, it added.
But the researchers said tough challenges remain ahead in terms of how to restore extinct animals, which would require breeding with animals that are still alive.
To revive a mammoth, researchers would need to find a way to implant a cell nucleus of a mammoth into the egg of an elephant and then implant the embryo into an elephant's uterus, it said.
The elephant is the closest modern relative of the mammoth, a huge woolly mammal believed to have died out with the Ice Age.
But Akira Iritani, a mammoth expert at Kinki University in Osaka, said it was only a matter of time before researchers could find a mammoth for a resurrection project.
"I have high hopes that we will be able to find a fine sample," he told public broadcaster NHK.
"It's said that there are more than 10,000 mammoths lying underneath Siberia," he said.
Even if it is impossible to recreate a whole animal, the process could create cloned embryonic stem cells for extinct species, giving a boost to research on evolution and zoology, he said.
Cloning can be controversial in terms of both bioethics and, if the animals are eaten, food safety.
Earlier this year, a report by the European Union warned that cloning can threaten the health of livestock.
South Korea's parliament has passed a law to regulate research into cloning, following a scandal in which a now-disgraced expert falsely claimed to have made the first human clone stem cells.


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This year's Antarctic zone hole is 5th biggest

NEW YORK – This year's ozone hole over Antarctica was the fifth biggest on record, reaching a maximum area of 10.5 million square miles in September, NASA says. That's considered "moderately large," NASA atmospheric scientist Paul Newman said in a statement.
NASA has tracked the size of the hole for 30 years. Last year, it was 9.7 million square miles, about the size of North America.
The hole is an area of depletion in the stratospheric ozone layer, which blocks harmful ultraviolet rays from space. Created by human-produced gases, the ozone hole generally forms in August and grows to its maximum size in September or October before breaking up.
___
On the Net:
NASA's ozone hole watch: http://ozonewatch.gsfc.nasa.gov/


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Senin, 03 November 2008

Intel's Core i7 Passes Muster

The first desktop PCs using a chip family called Intel Core i7 -- code-named Nehalem -- were found to handle some computing chores 30% to 40% faster than other comparable Intel chips, according to test results published by Web sites that include ExtremeTech, LegitReviews and AnandTech. Performance gains were particularly impressive for tasks such as video encoding and rendering three-dimensional images, the reviewers said.
Machines based on Core i7 chips were not much faster for some games and other standard software, the Web sites reported. The machines also consume more power than some existing Intel chips, indicating that the first model won't be suitable for portable computers.
"We know it's going to be the de facto chip for high-end desktops," predicted Kelt Reeves, president of Falcon Northwest, a company that manufactures PCs for gamers and other performance enthusiasts. "Already we've had huge interest."
Systems based on the new chips are not expected to go on sale until Nov. 17. But Intel provided sample chips to reviewers, who published their findings Monday. The sites also published pricing for the chips, which ranges from $284 for a model that operates at 2.66 gigahertz to $999 for an "Extreme Edition" model for gamers that operates at 3.2 gigahertz.

The Core i7 gets its speed from a series of major design changes that exploit Intel's advanced production processes -- including a feature called an integrated memory controller that was pioneered by rival Advanced Micro Devices Inc. Each chip has the equivalent of four calculating engines -- each of which can simultaneously complete up to two instructions--and has a pipeline to fetch data from memory chips with more than twice the capacity of prior chips, said Steve Smith, an Intel vice president and director of operations for its digital enterprise group.
Intel, based in Santa Clara, Calif., is also adding a feature that automatically boosts the operating speed of the chip for some chores. In addition, through a technique called over-clocking, some reviewers have operated the 3.2 gigahertz Extreme Edition model at up to 5 gigahertz, Mr. Smith said.
Intel is expected to introduce a Core i7 model for servers in the first half of 2009 and a model for portables in the second half.
AMD, based in Sunnyvale, Calif., is reserving its next performance boost for servers. It is expected to introduce a chip this month, code-named Shanghai, that is its first to adopt a sophisticated manufacturing process that Intel already uses for many of its products.
Write to Don Clark at don.clark@wsj.com

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International Space Station Litter Crashes Into Pacific

(RTTNews) - Monday, NASA officials reported that a refrigerator-sized ammonia tank that was thrown off the International Space Station over a year ago, finally crash-landed into the Tasman Sea late Sunday.The 1,400-pound tank was discarded in July 2007 to clear the way for future assembly work by space walker Clay Anderson. NASA officials said that the reentry would have a very low likelihood of impacting anybody.Originally, the tank was originally planned to be sent down on a space shuttle, but plans changed and it was simply tossed off the station. The speed of the tank gradually slowed down due to friction, thus descending, and becoming subject to more friction and so on. The tank hit the earth's atmosphere at an altitude of about 50 miles and was mostly disintegrated with any debris falling into the Pacific Ocean between Australia and New Zealand scientists said.Station Program Manager Mike Suffredini said that things are not thrown overboard from the space station haphazardly, but have a policy that has certain criteria to meet before any object can be discarded.
by RTT Staff WriterFor comments and feedback: contact editorial@rttnews.com
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Minggu, 02 November 2008

The War of the Words

"Human history becomes more and more a race between education and catastrophe." - H.G. Wells, The Outline of History "We have tried to analyze the most baffling phenomena while disregarding structural peculiarities of languages..." -Alfred Korzybski, Science and Sanity Do UFOs exist? Most people who read about UFOs want that question answered. Knowing this, writers on the subject of UFOs often spend an entire book, or series of books, trying to prove whatever answer they provide. So that those demanding an assertive answer from this author won't feel cheated, I shall give one here as precisely and concisely as I can. Fortunately for the attention-deficient reader, this should require only a few paragraphs. First, to answer the question: Yes, UFOs exist. I say this with such certainty because I have seen them hundreds of times while driving to the store, taking a stroll, and just gazing up at the stars. In fact, I dare say that anyone who denies ever seeing a UFO has: a. lied, b. lost their vision, c. spent their life under a rock, d. misunderstood the definition of the term UFO. In the early 1950s, Captain Edward Ruppelt, head of the U.S. Air Force Project Blue Book investigation, coined the term UFO (Unidentified Flying Object) and its necessary counterpart IFO (Identified Flying Object). [see Clark, Jerome. The UFO Book: Encyclopedia of the Extraterrestrial (New York: Visible Ink Press, 1998).] We can consider the primary aspiration of ufology - a neologism denoting UFO investigation - as an attempt to accurately reclassify UFOs to IFOs. When you drive down the road at 50 mph and peripherally see a black blur, you have had a UFO experience by definition. If you take the time to look back and examine the perceived object/event in question, you have graduated into a ufologists of sorts. In your investigation, you may recognize the black blur as a member of the bird species C. brachyrhynchos. Having thus identified a crow, you have turned a UFO into an IFO. People see UFOs (and UNFOs, unidentified non-flying objects) quite frequently, and accurately turn them into IFOs (or INFOs) perhaps most of the time. At this point, I would wager that the reader has picked up on a problem with the term UFO. Put simply, the problem stems from the synonymity between UFOs and other-worldly spacecraft. This semantically-erroneous generalization of the term has caused much unwarranted controversy and confusion over the years. (We'll get back to this in a moment.) Another, perhaps more critical, problem exists in ufology which derives from the widespread use of the term Unidentified Flying Object in the first place. I refer to the fact that flying object implies qualities which do not accurately describe the characteristics of many documented sightings. According to definitions provided by my Merriam-Webster and American Heritage dictionaries, "flying object" signifies a material entity which propels itself through the air via some mechanical means. It seems ludicrous to cram all the data on unidentified things in the air into such a limited, elementalistic definition. To avoid ascribing inaccurate qualities across the board, I introduce the term UAP (an acronym, pronounced "you-app"), which stands for Unidentified Aerial Phenomenon. Like UFO, it also generates a counterpart, IAP (pronounced "eye-app," denoting Identified Aerial Phenomenon). I think these terms generalize the bulk of reported sightings far better than the terms UFO and IFO. I say this, first, because the word aerial does not necessarily denote self-propulsion, mechanisms, or an operator. More importantly, the word phenomenon in both physics and philosophy signifies an occurrence perceptible by the senses. This usage does not make hasty ontological judgments of physicality from the get-go. For instance, Kantian philosophy defines the word phenomenon as the appearance of something to the mind as opposed to its objective existence, independent of the mind. (I also think the word phenomenon incorporates a more modern scientific approach by its implication of perspectivism, as opposed to the archaic notion of "true objectivity" in the pre-quantum sense of "solid objects existing independent of an observer.") To illustrate the usefulness of UAP over UFO, I would direct the curious to the case of the enigmatic lights reported in the sky over Greifswald, (then) East Germany in 1990. [see UFOs: The Best Evidence Ever Caught on Video (J. Frakes, host. Broadcast in U.S. on Fox television network, July 1997).] According to some sources, dozens, if not hundreds, of German and Russian employees at a nuclear power plant witnessed the formation of unexplained luminous orbs which hovered above the restricted site for over an hour. At least one person produced a video tape of the dancing lights, and in a segment of the tape we see one of the orbs merge with another in midair. When we see "illusory" behavior like this, we feel compelled to ask whether the phenomenon had any physical mass to it at all. For the sake of argument, let's assume that the phenomenon actually occurred and that the Greifswald footage does not represent a computer generated hoax. If so, we might seek an explanation such as a demonstration of high-tech holography. If this theory proved accurate, then the terms UFO/IFO no longer seem applicable. As most people know, holographic projections do not constitute solid objects or involve mechanics of flight such as the aerodynamic lift generated from the camber of a wing. However, the term UAP (unidentified aerial phenomenon) works quite well to incorporate such "ethereal" possibilities. Similarly, Identified Aerial Phenomenon (IAP) describes holography in general as accurately as it incorporates such documented phenomenological possibilities as ball lightning (kugelblitz), corona discharges, vaporized barium clouds, hallucination, etc. (Note that the term Identified Flying Object falls short of the mark in these cases.) Four hundred years before the Greifswald video, in Nuremberg, scores of inhabitants reported seeing formations of illuminated spheres, cylinders, and disks above the town. [see Nuremberg Broadsheet, 1561. Reproduced in Carl Jung's Flying Saucers: A Modern Myth of Things Seen in the Skies (Princeton University Press, 2nd printing, 1991).] Using even the most extreme models available to ufologists - including various fringe psychological, theological, or extraterrestrial/extradimensional theories - to explain these events, UAP apples far better than UFO does. Aside from its more encompassing description, the term UAP avoids the heavy cultural baggage attached to UFO, who's initial association with "paranormal" origins, however true or untrue it may prove upon final analysis, sets up a narrow and inflexible framework for honest scientific research. An investigator can benefit greatly from using the term UAP, I think, simply because it does not have the cultural connotations of UFO. We can see this acculturation (or occulturation ) of the term UFO clearly in Polish Archbishop Jozef Miroslaw Zycinskis' reply at a Vatican news conference to a reporter's question concerning interest in UFOs. The Archbishop dismissed ufology as indicative of the 'intellectual paucity of our era'. [see Simpson, Victor L. "Pope defends Church Central Truths." Associated Press, 15 October 1998.] Many in mainstream science and academia seem to agree with the Archbishop's assertion. Physicist Bruce Maccabee, for example, notes the reality of ridicule that exists for those in the scientific community who investigate airborne anomalies, likening the endeavor to 'professional suicide.' [see Dr. Maccabee's online reply to New York Post editors' criticism of the recent ufological study conducted by the Society for Scientific Exploration (SSE). Paul Flatin of the Kyodo News Service (29 June 1998) wrote: "Despite the abundance of UFO reports over the past 50 years, the scientific community had shown little interest in the subject due to a lack of funding to support research and a perception that the field is not respectable, the [SSE] report said."] For a long time scientists sneered at reports by numerous witnesses of luminous phenomenon seen during earthquakes in various countries. Experts ascribed all kinds of explanations to the sightings, from hoax to hallucination. It took a team of scientists at Idu, Japan to accidentally observe the strange lights firsthand before they became an accepted occurrence.Until then, in spite of the abundance of eyewitness accounts, there was some doubt as to the reality of those long flashes of lightning, balls of fire, spreading beams, pencils of light, and curtains of varying color and intensity... Ordinary explanations for phenomena[a] of this kind - storm lightning, aurora borealis, electric arcs between high-tension cables, and above all, the witness' own emotion... could be refuted one after the other at Idu, and the luminous manifestations attributed to the earthquake. [from Tazieff, Haroun. When the Earth Trembles. (New York: Harcourt, Brace & World, Inc., 1966).] Science seems replete with mysterious aerial phenomena, including the earthlights at Idu, the more recent observations of lightning sprites, and numerous other unknowns of today. Bearing this in mind, I think the mental myopia of Scientific Orthodoxy concerning "UFOs" stands as a far better example of intellectual paucity than the investigation of as-yet unidentified phenomenon. If only we can internalize the concept of UAP over UFO... My research thus far indicates the use of the term "unidentified aerial phenomenon" as early as 22 March 1949, as described in a memo from the U.S. Strategic Air Command to the director of the FBI (released under the Freedom of Information Act, 1977). The reader should note that although I have advocated the initial use of the term UAP over UFO, I have not prescribed replacing it altogether. I say this for two reasons: 1. UFO has decades of cultural staying-power (as a MUFON State Director once quipped to me, "we're not going to change our name to MUAPN!"), and 2. despite its inherent neuro-semantic inadequacies, UFO has its place in the specialized study of ontological oddities. For instance, in his classic Anatomy of a Phenomenon (Chicago: Henry Regnery Co., 1965), Dr. Jacques Vallee wrote, "UFO phenomena are to be found among reports of objects, lights, beings, or physical effects that are regarded by the witnesses as anomalies because of their appearance or behavior." [see Vallee's Confrontations: A Scientists Search for Alien Contact (New York: Ballantine Books, 1990, p208-19) for more on definitions and classification systems in ufology.] As Vallee, Clark, Randles, and other veterans of ufology have extensively documented, many "UFO" cases don't even involve aerial phenomenon at all! To encompass these types of "Fortean" cases, I introduce a change from the conventional UFO (an acronym, all caps) to ufo (pronounced "you-foe"). [see "Mytho-Ufology" in the Winter-Spring 2000 issue of Rhesus Monkey Magazine for an example of ufo usage.] The reason for this change stems from linguistic and semantic factors concerning the term. As Professor Steven Pinker of MIT recently pointed out [in Words and Rules (New York: Basic Books, 1999, p28)], UFO has evolved, through decades of use, into a bona fide word. So why not treat it as such? Of course, we do not pronounce VCRs as "vikers" or POWs as a sound effect in a comic book, so why change the pronunciation of UFOs ("you-eff-ohs")? Put simply, the term UFO no longer remains synonymous with its root, no longer operates as a "true" acronym. (This goes to explain the confusing resulting from polls which ask people questions like, "do you believe in UFOs", or "do you think the government knows more about UFOs then they divulge to the public.") Thus changing the defunct acronym to a base word divorces it from its old meaning to accord with modern multiordinal interpretations. Since this essay's original printing [in the Spring 1999 issue of ETC: A Review of General Semantics (Concord, CA: International Society for General Semantics, Vol56 No1, p53-9)] my prescribing the general use of the word ufo has only seen opponents, curiously enough, from some ufologists (and a few writers of the "paranormal"). Since a few of the bios printed about me claim otherwise, I feel I should state for the record that - although I have done much work interviewing, researching, writing, etc. in their field of study - I do not consider myself a "ufologist" (or any other kind of "ologist" for that matter). It does, however, seem wryly amusing to note that the few "ufologists" who disdainfully replied to my verbal alteration of UFO to ufo actually referred to themselves as ufologists ("you-follow-gists") in their calls and letters to me, not one having called themself a UFO-logist ("you-eff-oh-low-gist"). You follow the gist? Dr. Jacques Vallee has commented, with great disappointment, that ufology seems to have 'slipped back into its infancy.' [see report in the online November-December 1995 issue of UFO Magazine, "Jacques Vallee Issues Warning to UFO Researchers."] Perhaps the re-introduction of the "technical" term Unidentified Aerial Phenomenon and my prescription of the word ufo will help to ensure this field of investigation avoids unnecessary atavism and academic enmity. As Tennessee Williams once said, "It's an unanswered question, but let us still believe in the dignity and importance of the question." We can use all the help we can get in a field of scientific investigation whose subjects remain - to borrow a phrase - up in the air.
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Kamis, 01 November 2007

THE BROWN MOUNTAIN LIGHTS

For centuries, mysterious lights have baffled observers on Brown Mountain in Burke County, North Carolina. The strange lights are often described as white, red, or yellow balls of light. They reportedly move around or remain stationary. Sometimes they are said to look like misty spheres or produce a sizzling sound. Close encounters with the lights have been said to cause dizziness as was described in a 1962 report in the "Charlotte Observer". Twelve eyewitnesses watched the lights from a 60-foot tower. When one of the lights approached one of the men, he suddenly had "a static-like feeling of dizziness". According to the report, when the men climbed down from the tower, they were unable to stand. Explanations for the lights range from several ghostly legends to scientific theories including ball lightning and "earth-lights".
Dating back to 800 year-old Cherokee legends where the lights were said to be the spirits of slain warriors, the Brown Mountain Lights have been observed and investigated numerous times. In 1771, German engineer Geraud de Brahm wrote about the lights in his journals. In an attempt to provide a scientific explanation for the phenomenon, de Brahm wrote: "The mountains emit nitrous vapors which are borne by the wind and when laden winds meet each other the niter inflames, sulphurates and deteriorates." "The Charlotte Observer", a local newspaper, was the first to feature a story on the lights in 1913. W. J. Humphries, of the U.S. Weather Bureau investigated the lights and compared them to a similar phenomenon in the Andes Mountains of South America.
Another government organization, the U.S. Geological Survey, launched two expeditions on Brown Mountain in 1916 and 1922, digging deeper into the mystery. During the 1922 survey, scientist George Rogers Mansfield found a variety of possible causes for the lights including cars, trains, stationary lights and brush fires. Fireflies were even a culprit, but were later viewed as an unlikely explanation. While Mansfield found numerous possibilities for the cause of the lights, he found that a small percentage still had no known cause. Others who have investigated the phenomenon suggest they are "earth lights", a luminous phenomenon caused my seismic activity. Mirages, ball lightning, and swamp gas (despite the lack of swamps on Brown Mountain) have all failed to completely explain the nature of the lights.
The luminous orbs eventually made their way into a bluegrass hit, "The Legend of the Brown Mountain Light," performed by musician Tommy Faile in the 1960’s.
Over a two-week period in November 2000, L.E.M.U.R. Paranormal Research Team based in Asheville, North Carolina observed and filmed the Brown Mountain Lights using an Infrared Night Vision camera. Over an hour of activity was captured on the first known video evidence of the Brown Mountain Lights. L.E.M.U.R. hopes this footage will yield more clues about the mysterious lights that always have eluded a suitable explanation.
The L.E.M.U.R. team plans to show the footage during the First Annual Paranormal Weekend in Asheville, N.C. on January 11-13, 2002. Joshua P. Warren, founder and president of L.E.M.U.R., has written two books, "Haunted Asheville" and "How To Hunt Ghosts". "I believe footage of this quality is the most significant step forward in the history of researching the lights," says Warren. "By studying the video, we’re targeting places on the ridge to research further. Ultimately, we hope to solve the mystery."
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THE POPOBAWA - A ZANZIBARI INCUBUS



The infamous Popobawa has struck again causing panic in the Zanzibar islands off the coast of Tanzania in Africa. The "creature", described as a cyclops dwarf with bat-like wings and ears, and sharp talons, is feared for its nasty habit of sodomizing men while they sleep in their beds. The presence of the often invisible Popobawa can be detected by an acrid smell or a puff of smoke. Sometimes, the Popobawa is visible to everyone except the terrified victim. It is believed to take human form by day, but with pointed fingers. After doing its vile deed, the Popobawa instructs its victims to spread the word about their ordeal or it would be back.
The Popobawa, its name derived from the Swahili words for "bat" and "wing", first appeared in the neighboring island of Pemba in 1972. More attacks were reported in the 1980s, again in April of 1995, and recently in 2000 and July 2001. Attacks appear to coincide with political stress such as election. The 1972 attacks followed the assassination of the country’s president. Interestingly, the recent attacks have come without any political turmoil.
Hospitals in Zanzibar have treated numerous broken ribs, bruises, and other injuries attributed to the Popobawa. One mentally ill man was hacked to death after confessing that he was the troublesome demon. During times when the Popobawa terrorizes the islands, whole families will often sleep arm-in-arm in front of their houses, seeking safety in numbers.
Mjaka Hamad, a peasant farmer in his mid-50s and a victim of the Popobawa’s attacks in 1995, has related his ordeal to the media. "I could feel it," Hamad said. "...something pressing on me. I couldn’t imagine what sort of thing was happening to me. You feel as if you are screaming with no voice. It was just like a dream but then I was thinking it was this Popobawa and he had come to do something terrible to me, something sexual. It is worse than what he does to women." Hamad claimed that he did not believe in the Popobawa or other spirits before the attack and suggests that is the reason he was attacked. "I don’t believe in spirits so maybe that’s why it attacked me. Maybe it will attack anybody who doesn’t believe."
The Popobawa appears to be an African version of the wide-spread Mara phenomenon. Joe Nickell, an investigator with CSICOP (Committee for the Scientific Investigation of Claims of the Paranormal), has compared the Popobawa to Medieval legends of succubi (female spirits) and incubi (male spirits) who sexually molested their victims in bed at night. In Newfoundland, an ugly old woman sexually molested men in a phenomenon known as Hagging. Other similar reports from around the world describe vampires, formless black blobs, and extraterrestrials among other bizarre entities.
Skeptics claim that these experiences are a result of a hypnogogic hallucination during a "waking dream". Paralysis, a sense of being weighted down, floating sensations, and encounters with otherworldly beings are often all unifying characteristics of the phenomenon.


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