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  1. #11
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    Re: Science News

    Invasive mite worsens honeybee viruses
    Parasite’s move into Hawaiian islands lets obscure pathogen go big and bad

    By Susan Milius
    Web edition : Friday, June 8th, 2012

    A mite that parasitizes honeybees can turn formerly small-time, local virus strains into widespread, dominant hazards.

    As the Varroa destructor mite infiltrated Hawaiian bee colonies from 2007 to 2010, viral infection strength in local bees soared a million-fold, and a once-obscure but nasty strain of deformed wing virus surged to prominence. Even when beekeepers beat back the mite, the newly prominent virus remained abundant. Mite damage plus the virus shorten the lives of bees and can destroy colonies.

    So far Hawaiian beekeepers have not reported the swifter, specific malady called colony collapse disorder (SN: 7/28/2007, p. 56), but the ability of the mite — now spreading globally — to reshape viral threats is worrisome, say Stephen J. Martin of the University of Sheffield in England and his colleagues in the June 8 Science.


    Honeybees in Hawaii, like the one shown on the native Hawaiian tree "Ohi'a," face worsening risks from deformed wing virus as the Varroa destructor mite spreads across the islands. Credit: Courtesy of Ethel M. Villalobos
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    Re: Science News

    Ancient volcanoes destroyed ozone
    Eruptions gave off gas that eroded the protective atmospheric layer

    By Alexandra Witze

    Web edition : Tuesday, June 12th, 2012

    SELFOSS, Iceland — Geoscientists have exposed another assault on Earth’s protective ozone layer — not by manufactured chemicals, but by gas ejected in the blasts of huge volcanic eruptions.

    A new study shows that volcanic rocks in Nicaragua contain bromine, an element known for speeding ozone’s destruction in the upper atmosphere. When magma erupted to form those rocks, scientists say, it also released huge amounts of bromine into the air — enough to destroy large parts of the ozone layer for several years.

    “We have to be aware of this,” says Kirstin Krüger, a meteorologist at the Leibniz Institute of Marine Sciences at the University of Kiel (GEOMAR) in Germany. “Large-scale tropical eruptions have the potential to deplete ozone on a big scale.”

    Krüger presented the work, led by GEOMAR volcanologist Steffen Kutterolf, on June 12 at an American Geophysical Union conference on volcanism and the atmosphere.

    The scientists studied rocks formed during 13 big Central American eruptions over the past 70,000 years. Volcanoes at tropical latitudes are good at injecting the stuff they erupt into the stratosphere, some 16 kilometers up. When elements such as chlorine and bromine reach that high, they help trigger a series of reactions in which ozone’s three oxygen atoms break apart and recombine with other atoms.

    Researchers have previously measured chlorine coming from volcanoes, such as 1991’s Mount Pinatubo eruption in the Philippines, and watched it destroy ozone overhead. But the new work is the first to pin down bromine in such detail. The element is 60 times as efficient as chlorine at destroying ozone, Krüger says.

    Kutterolf and his colleagues collected thousands of rock samples both on and offshore, then analyzed bromine concentrations in tiny glass bubbles that formed within the rocks when the magma erupted out of the volcano. The scientists found enough bromine in the bubbles to suggest that 4,000 to 600,000 tons of bromine came out per eruption.

    Enough bromine would have made it to the stratosphere to create at least double the ozone-destroying potential seen at the highest modern-day levels, Krüger says. It would have taken three to six years for the chemicals to clear out so that ozone could begin to recover.

    It’s still not clear what makes a particular eruption rich in bromine, or whether the bromine would have destroyed ozone locally or globally once aloft.

    About three-quarters of atmospheric bromine comes from human-made sources like chlorofluorocarbon chemicals, used in refrigeration and other devices. One-quarter is natural, produced by the sea or by volcanoes. “Wherever it comes from, it will destroy the ozone,” Krüger says. Most human-made ozone-depleting chemicals were phased out by the 1987 Montreal Protocol.

    The new study is an important step in better quantifying bromine from present-day eruptions, says Tamsin Mather, a volcanologist at the University of Oxford in England. “If we can apply this to other volcanoes,” she says, “we can really get a handle on how much bromine is coming out.”


    Bromine from big volcanic eruptions, like the one that created the Apoyo Caldera in Nicaragua 24,500 years ago, would have destroyed the planet’s protective ozone for years at a stretch. Credit: Steffen Kutterolf/GEOMAR
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  3. #13
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    Re: Science News

    Quote Originally Posted by Duke of Buckingham View Post
    Ancient volcanoes destroyed ozone
    Eruptions gave off gas that eroded the protective atmospheric layer

    By Alexandra Witze
    This is obviously a load of crap. We all know that man is the sole source of all things harmful to the environment. Without man, everything would be rainbows and unicorns.
    "Don't confront me with my failures, I had not forgotten them" - Jackson Browne

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    Re: Science News


    Joined Original Message Board: Fri Jan 27, 2006 1:47 pm, Currently with 11298 Posts

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  5. #15
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    Re: Science News

    Quote Originally Posted by zombie67 View Post
    This is obviously a load of crap. We all know that man is the sole source of all things harmful to the environment. Without man, everything would be rainbows and unicorns.
    I don't think so Z, no unicorns and some rare rainbows. The world is ruled by the nature of the Universe that we can understand is a very violent place for life.

    We have enough proofs, that in the pass, the world lived some several mass extictions, long before man was around. I have a brief history of the major extinctions:

    In a landmark paper published in 1982, Jack Sepkoski and David M. Raup identified five mass extinctions. They were originally identified as outliers to a general trend of decreasing extinction rates during the Phanerozoic, but as more stringent statistical tests have been applied to the accumulating data, the "Big Five" cannot be so clearly defined, but rather appear to represent the largest (or some of the largest) of a relatively smooth continuum of extinction events.

    1 - Cretaceous–Paleogene extinction event (End Cretaceous, K-T extinction, or K-Pg extinction): 65.5 Ma at the Cretaceous.Maastrichtian-Paleogene.Danian transition interval. The K–T event is now officially called the Cretaceous–Paleogene (or K–Pg) extinction event in place of Cretaceous-Tertiary. About 17% of all families, 50% of all genera and 75% of species became extinct. In the seas it reduced the percentage of sessile animals to about 33%. The majority of non-avian dinosaurs became extinct during that time. The boundary event was severe with a significant amount of variability in the rate of extinction between and among different clades. Mammals and birds emerged as dominant land vertebrates in the age of new life.
    2 - Triassic–Jurassic extinction event (End Triassic): 205 Ma at the Triassic-Jurassic transition. About 23% of all families and 48% of all genera (20% of marine families and 55% of marine genera) went extinct. Most non-dinosaurian archosaurs, most therapsids, and most of the large amphibians were eliminated, leaving dinosaurs with little terrestrial competition. Non-dinosaurian archosaurs continued to dominate aquatic environments, while non-archosaurian diapsids continued to dominate marine environments. The Temnospondyl lineage of large amphibians also survived until the Cretaceous in Australia (e.g., Koolasuchus).
    3 - Permian–Triassic extinction event (End Permian): 251 Ma at the Permian-Triassic transition. Earth's largest extinction killed 57% of all families and 83% of all genera (53% of marine families, 84% of marine genera, about 96% of all marine species and an estimated 70% of land species) including insects. The evidence of plants is less clear, but new taxa became dominant after the extinction. The "Great Dying" had enormous evolutionary significance: on land, it ended the primacy of mammal-like reptiles. The recovery of vertebrates took 30 million years, but the vacant niches created the opportunity for archosaurs to become ascendant. In the seas, the percentage of animals that were sessile dropped from 67% to 50%. The whole late Permian was a difficult time for at least marine life, even before the "Great Dying".
    4 - Late Devonian extinction: 375–360 Ma near the Devonian-Carboniferous transition. At the end of the Frasnian Age in the later part(s) of the Devonian Period, a prolonged series of extinctions eliminated about 19% of all families, 50% of all genera and 70% of all species. This extinction event lasted perhaps as long as 20 Ma, and there is evidence for a series of extinction pulses within this period.
    5 - Ordovician–Silurian extinction event (End Ordovician or O-S): 450–440 Ma at the Ordovician-Silurian transition. Two events occurred that killed off 27% of all families and 57% of all genera. Together they are ranked by many scientists as the second largest of the five major extinctions in Earth's history in terms of percentage of genera that went extinct.


    Despite the popularization of these five events, there is no fine line separating them from other extinction events; indeed, using different methods of calculating an extinction's impact can lead to other events featuring in the top five.

    The older the fossil record gets, the more difficult it is to read. This is because:

    Older fossils are harder to find because they are usually buried at a considerable depth in the rock.
    Dating older fossils is more difficult.
    Productive fossil beds are researched more than unproductive ones, therefore leaving certain periods unresearched.
    Prehistoric environmental disturbances can disturb the deposition process.
    The preservation of fossils varies on land, but marine fossils tend to be better preserved than their sought after land-based counterparts.


    It has been suggested that the apparent variations in marine biodiversity may actually be an artifact, with abundance estimates directly related to quantity of rock available for sampling from different time periods. However, statistical analysis shows that this can only account for 50% of the observed pattern, and other evidence (such as fungal spikes)[clarification needed] provides reassurance that most widely accepted extinction events are indeed real. A quantification of the rock exposure of Western Europe does indicate that many of the minor events for which a biological explanation has been sought are most readily explained by sampling bias.


    And we had some lesser extinctions also:

    Quaternary extinction event 50 ka to now
    Neogene 23.03 Middle Miocene disruption 14.5 Ma Nördlinger Ries bolide impact? Volcanoes in African Rift Valley
    Eocene–Oligocene extinction event 33.9 Ma Volcanoes? Chesapeake Bay and Popigai crater bolide impacts?
    Cretaceous 145.5 Aptian extinction 117 Ma Rahjamal Traps volcanism episode in Bengal?
    End-Jurassic extinction 145.5 Ma
    Jurassic 199.6 Toarcian turnover 183 Ma
    Permian 299 Olson's Extinction 270 Ma
    Carboniferous 359.2 Carboniferous Rainforest Collapse 318 Ma Climate change
    End Silurian 416 Ma
    Lau event 420 Ma
    Mulde event 424 Ma Global drop in sea level?
    Silurian 443.7 Ireviken event 428 Ma Deep-ocean anoxia?
    Cambrian–Ordovician extinction event 488 Ma Glaciation? Depletion of oxygen in marine waters?
    Dresbachian 502 Ma
    Cambrian 542 End Botomian extinction event 517 Ma
    Precambrian 4567.17 End-Ediacaran extinction 542 Ma Ocean anoxia?


    So as you can see, man it is not the only danger to life Z. We must have some protection to keep the life going but we know that for shure or wouldn't talk about extinctions on a dayly basis.

    Some say the next will come on 21st December of this year. I say they didn't read the Maia, Aztecs and Inca hystory as they should. They were expecting their gods to come back, not the destruction of the world. The only surprise that could happen on that day was the ETs showing up in some places. The Maya codices are listed in here with a brief description of each but a good search and some studies could help the understanding of this fascinating culture.

    http://en.wikipedia.org/wiki/Maya_codices
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  6. #16
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    Re: Science News

    Dark matter filament illuminated
    Astronomers visualize one connection in a shadowy cosmic network

    By Devin Powell
    Web edition : 7:20 am


    An invisible web thought to span the cosmos has now revealed one of its strands.

    That thread is spun of dark matter and connects two titanic clusters of galaxies, some of the most massive objects in the universe. Its discovery supports the idea that galaxy clusters grow at the intersections of such filaments, and its heft backs the claim that filaments hide more than half of all matter.

    “Filaments of dark matter have never been seen before,” says Jörg Dietrich, an astronomer at the University Observatory Munich in Germany, whose team reports the finding online July 4 in Nature. “For the first time, we successfully mapped one.”

    As the name suggests, dark matter is difficult to detect because it gives off no light or other radiation. The material’s presence is typically inferred by measuring how its gravitational pull changes the motions of stars and galaxies.

    But look closely, and the shy matter can provide more direct evidence of its presence. Its gravity warps the fabric of spacetime and bends light passing nearby, so that more distant galaxies beyond the intervening dark matter appear distorted.

    This lensing has already revealed dense clouds of dark matter kicked out of colliding galaxies. (SN Online: 3/06/12; SN: 8/26/06, p. 131) Filaments should likewise produce the fun house–like distortion. But since the dark matter in such structures isn’t as dense as the clouds ejected by galactic smashups, the effect is much weaker.

    “With current telescopes … it’s very difficult to detect a filament,” says Lindsay King, an astrophysicist at the University of Texas at Dallas.

    To improve the odds of seeing one, Dietrich and colleagues focused on Abell 222/223, a pair of galaxy clusters that are close together and thus should be connected by a relatively massive filament. X-ray observations had already revealed a ribbon of hot gas between the clusters — the first hint of a dark matter link. Using the Subaru telescope in Hawaii, the researchers looked at light from distant galaxies passing through the space between the clusters.

    Sure enough, the distorted shapes of the galaxies revealed a thick cord of matter with a mass comparable to that of a small galaxy cluster. Gas can account for only about 9 percent of that mass. Dark matter seems to make up the rest.

    The new study won’t resolve the ongoing debate over the composition of dark matter; several candidate ingredients have been proposed. But understanding the structure of filaments could help to reveal their role in building galaxy clusters by funneling in gas or whole galaxies.

    “We’re starting to connect the dots,” says Meghan Gray, an astronomer at the University of Nottingham in England who wasn’t involved in the study. “In the future I expect we will extend this and see more of these filaments.”


    Contour lines outline an invisible dark matter filament connecting the galaxy clusters Abell 222 (bottom) and Abell 223 (top) in the night sky. The cosmic thread revealed itself by distorting light coming from distant galaxies. Credit: J. Dietrich/University Observatory Munich
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    Re: Science News

    Space trek may help worms live long
    Nematodes that orbited Earth had reduced signs of aging

    By Tina Hesman Saey
    Web edition : Thursday, July 5th, 2012


    In space they can barely see you age, at least if you’re a worm.

    Tiny, transparent nematodes that spent 11 days on the International Space Station — the equivalent of about 16 years for a person — appeared to age much more slowly than earthbound worms, Yoko Honda of the Tokyo Metropolitan Institute of Gerontology and colleagues report online July 5 in Scientific Reports.

    The result is the opposite of what some scientists expected, based on experience with human spaceflight and studies of other animals. Mammals, including people, in the microgravity of space are under physiological stress, says D. Marshall Porterfield, director of NASA’s Space Life and Physical Sciences Research and Applications Division in Greenbelt, Md. In low gravity, muscles atrophy and aging accelerates.

    While the space station worms, from the species Caenorhabditis elegans, may have been under stress, they didn’t have those side effects. Their muscles did not degrade, and clumps of aging-related proteins known as Q35 aggregates did not build up in them as much as in worms on the ground, indicating that worms don’t age as fast in space as on Earth. Worms that visited the space station were frozen immediately after returning to Earth, so the researchers weren’t able to test whether time in space enabled the critters to live longer.

    The researchers also discovered that relative to ground-based nematodes, the space-faring worms had lower activity of 199 genes, including 11 genes involved in transmitting information through the nervous or endocrine systems. For seven of the 11 genes, mutations that lowered the genes’ activity also caused ground-based worms in a separate experiment to live longer.

    Reduced activity of three of the life-extending genes — called gar-3, cha-1 and shk-1 — also lowered the number of Q35 clumps that built up in aging worms. Those genes encode proteins that are produced in the nervous system, and two of them also encode proteins that are made in muscles.

    Lowering the levels of those proteins during spaceflight might affect how worms perceive their environment, leading the nematodes to reduce their metabolism and extend their life spans, says Catharine Conley, NASA’s planetary protection officer. Conley helped develop the substance that worms grow in while in space.

    Studying worms in space may help scientists learn more about how low gravity affects organisms, regardless of the impact on life span, Porterfield says. “It doesn’t really matter what the outcome is if we learn about the biophysical environment,” he says. That knowledge may help engineers design ways of better protecting the health of astronauts.


    Tiny worms that spent time in space (like the one shown here) have fewer clumps of aging-related proteins (green) than worms that stayed on the ground. That could mean that worms live longer in microgravity. Credit: Richard Morimoto/Northwestern Univ.
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    Re: Science News

    Not your typical pterosaur
    Beautifully preserved fossil displays novel wing feature
    By Janet Raloff
    Web edition : Monday, July 9th, 2012


    For a decade, scientists largely ignored a fossil of a juvenile, late-Jurassic flying reptile that’s just 14 centimeters long. It appeared to be just another of some 120 specimens of the genus Rhamphorhynchus excavated at Germany’s famed Solnhofen limestone beds.

    Closer inspection now shows it’s something new, David Hone of the University of Bristol in England and his colleagues report July 5 in PLoS ONE. They’re creating a genus dubbed Bellubrunnus, or Brunn beauty, to honor the German quarry where it was unearthed.

    The tiny flyer has fewer teeth and a more flexible tail than other Rhamphorhynchus-like pterosaurs. And the outermost bone of each wing curves outward, distinguishing it from any known flying vertebrate alive or extinct. This would have made flying somewhat harder, Hone explains, but afforded somewhat improved maneuverability to this animal, which had a perhaps meter-wide wingspan at maturity.


    This 14-centimeter-long fossil of a flying reptile has been given its own genus, dubbed Bellubrunnus, to acknowledge the curved wings that distinguish it from other known flying vertebrates. Credit: D.W.E. Hone
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    Re: Science News

    Moon patterns explained
    Electric fields enveloping magnetic bubbles create lunar swirls
    By Meghan Rosen
    Web edition : Wednesday, July 11th, 2012


    Scientists have charged up an old moon mystery. New research suggests that swirling designs on the dusty lunar surface might be the product of electric fields generated by pockets of magnetic bubbles.

    “People have been looking at these strange, mysterious structures since the invention of the telescope,” says physicist Ruth Bamford of the Rutherford Appleton Laboratory in Didcot, England. “Now we know exactly how they are made.”

    The milky patterns stand out like pale flesh against darkly tanned skin. It’s as if you used sunblock to paint whorls on your arm and then spent the day outside, says planetary geologist Georgiana Kramer of the Lunar and Planetary Institute in Houston. The sun would color everything but the protected skin, leaving the whorls white.

    Scientists have long suspected that weak magnetic fields near the moon’s surface might shape the looping patterns. The moon doesn’t have a dynamo-driven magnetic field like Earth’s, but researchers have found patchy magnetic bubbles scattered across the lunar crust.


    A stream of charged particles (glowing purple) flows around a magnet in a solar wind tunnel experiment. Credit: Courtesy of R. Bamford

    Data from the Apollo missions fed a 1970s theory that the moon’s magnetic bubbles act like a solar wind sunblock. The solar wind — a steady stream of charged particles from the sun — constantly buffets the moon, turning pale lunar dust dark. But magnetic bubbles might protect the moon’s crust, keeping silvery soil fresh and young-looking.

    The mystery, Bamford says, was how such puny fields can deflect the raging solar wind. The answer is the bubbles’ electric field, she and her colleagues suggest in an upcoming Physical Review Letters.

    Usually, the solar wind’s charged particles travel together. But when the wind smacks into the moon’s magnetic bubbles, flimsy negatively charged particles skirt around the bubble and hefty positive ones try to penetrate it. Splitting apart these oppositely charged particles whips up a heavy-duty electric field.

    Bamford’s team created a scaled-down laboratory version to find out if man-made magnetic bubbles could also deflect rushing rivers of particles.

    The researchers used a device called a solar wind tunnel to shoot a jet of blazing particles down a tube. The searing stream toasted any object in its path, except, the team discovered, a magnet. The scientists showed that a thin electric field formed around the magnet, shielding it — and anything behind it — from the scorching flow. “It works incredibly well,” Bamford says. Even a marshmallow placed in the magnet’s wake would escape melting, she says.

    And if a tiny magnet — only slightly larger than an eraser tip — could make a protective electric skin, the moon’s much larger magnetic bubbles might also be able to.

    “The work ties a bunch of ideas together,” says planetary scientist Ian Garrick-Bethell of the University of California, Santa Cruz. “And the lab model is really cool.”


    Bright white designs called lunar swirls stretch across about 60 kilometers of the moon’s surface. Credit: NASA
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    Re: Science News

    Top airports for spreading germs IDed
    Major hubs with far-flung flights are most efficient
    By Rachel Ehrenberg
    Web edition : Friday, July 27th, 2012


    An infectious disease that really wants to go global would do well boarding planes at JFK or LAX, according to a new computer simulation that ranks U.S. airports by their potential to kick-start an epidemic.

    The simulation could help public health officials decide how and where to allocate resources such as vaccinations in the early days of an outbreak, says Ruben Juanes of MIT, who describes the analysis online July 19 in PLOS ONE.

    Many simulations of how epidemics spread focus on the final outcome, such as how many people would ultimately be infected. This new work is mostly concerned with how the location of an initial outbreak affects the subsequent pandemic, says complex systems scientist Dirk Brockmann of Northwestern University in Evanston, Ill.

    Surprisingly, the total number of passengers moving through an airport isn’t the deciding factor. By that measure, Atlanta’s airport — the busiest in the country — would be ideal for spreading germs. What’s key is how connected the airport is to other well-connected airports.

    “You are a good spreader if your neighbors are good spreaders,” Juanes says. “That’s what’s really essential.”

    Once an epidemic is well under way, other factors such as how the germ moves from one person to another seem to be most important, he says.

    Juanes and his colleagues used air travel data on all flights originating or landing in the U.S. from January 2007 to July 2010 to construct an air transportation network made up of 1,833 airports and roughly 50,000 connections. The researchers also extracted airport waiting times from passenger itineraries. Then they developed a computer program that incorporated information on people’s travel patterns and how infectious diseases move from person to person.

    The program ranks 40 major U.S. airports for how influential they are at spreading a disease originating in their home city. That New York City’s John F. Kennedy International Airport came in first and Los Angeles International was second isn’t so surprising. But third on the list is Honolulu International, which is only the 25th busiest airport in the country. Yet Honolulu is supremely positioned for sending sick people to myriad far-flung destinations. The airport is well-connected to massive hubs, it sends and receives travelers from both East and West, and its flight schedule is dominated by long-range routes.

    Atlanta’s airport, on the other hand, ranked eighth. While it’s very busy in terms of number of passengers, most of the travel to and from Atlanta is regional. The flights in and out are on the shorter side and are to places that aren’t well connected, notes Juanes.

    For passengers in the Washington, D.C., area, traveling via Dulles really helps germs out; it ranked seventh most influential. Baltimore’s airport ranked 23rd and Reagan National 30th.


    U.S. airports that are hubs and are connected to lots of other hubs, such as Honolulu International and JFK, excel at spreading infectious diseases that originate in the airport’s home city. Credit: Christos Nicolaides/MIT
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