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Tópico: Curiosidades Científicas

  1. #1021
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    New measurement confirms: The ozone is coming back
    Despite lots of year-to-year variability, trends are now becoming clear.

    https://arstechnica.com/science/2018...s-coming-back/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  2. #1022
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    Mysterious explosion of a deadly plague may come down to a sugar in ice cream
    C. diff kills tens of thousands each year. Its puzzling rise links to trehalose.
    ...
    To us, trehalose is an indistinguishable sweetener. It’s about 45 percent as sweet a table sugar (sucrose) and breaks down to simple glucose. But, according to the authors of the new Nature study, we’re not the only consumers. In a sugar-eating screen, the study authors noted that two C. diff. strains (out of 21) could happily survive on just a dash of trehalose.
    ...
    https://arstechnica.com/science/2018...savage-plague/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  3. #1023
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    A greener shade of blue
    Because who doesn’t want sustainable jeans?

    Indigo plants have been used to dye fabric for thousands of years. Unlike other dyes, indigo does not end up chemically linked to textile fibers; rather, it adsorbs to the surface of the threads. This allows the fibers' white cores to show through to various degrees after abrasion. Hence that impossible-to-replicate look of perfectly worn-in jeans.

    But indigo plants yield only a small amount of the dye. It's not nearly enough to keep pace with the enormous demand that Levi Strauss unleashed when he invented blue jeans in the 1870s. Now, after more than a century of relying on a lot of toxic chemicals to make a synthetic version, researchers have engineered bacteria that will make it.
    ...
    https://arstechnica.com/science/2018...shade-of-blue/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  4. #1024
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    A gene that keeps track of how often it’s made into a protein
    The more protein that’s made, the more likely the gene is to be shut down.

    https://arstechnica.com/science/2018...nto-a-protein/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  5. #1025
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    Gut bacteria linked to cataclysmic epidemic that wiped out 16th-century Mexico
    The mysterious pestilence is thought to have killed up to 80 percent of the population.

    https://arstechnica.com/science/2018...entury-mexico/
    ‘Abundant bleeding’ epidemic in 16th-century Mexico might have been Salmonella
    Ancient DNA links an unusual strain of Salmonella to a mysterious epidemic that killed millions of people between 1545 and 1550

    https://www.theverge.com/2018/1/15/1...hi-ancient-dna
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  6. #1026
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    How gold nanoparticles may make killing tumors easier
    Gold nanorods do it all: Imaging, treatment, and monitoring of tumor-killing.

    One of the ways to kill a cancer is to cook it, since heat can kill cells. The trick, of course, is to only cook the cancer and not the surrounding tissue. To do this, you need to have an accurate idea of the extent of a tumor, a precise mechanism for delivering heat, and a damn good thermometer. It may surprise you to learn that gold nanoparticles do a pretty good job of achieving the first two. The third—a good thermometer—has eluded researchers for quite some time. But, now it seems that gold nanoparticles may provide the full trifecta.

    https://arstechnica.com/science/2018...tumor-killing/
    Scientists racing to save vital medical isotopes imperiled by shabby reactors
    Current situation is “like running through the desert with an ice cream cone.”
    ...
    According to KHN, most Mo-99 in the US is made by irradiating Cold War-era uranium from America’s nuclear stockpile. The US Department of Energy’s National Nuclear Security Administration secretly ships it to aging reactors abroad. The reactors—and five subsequent processing plants—are in Australia, Canada, Europe (Netherlands, Belgium, Poland, and the Czech Republic), and South Africa, according to a 2016 report by The National Academies of Sciences, Engineering and Medicine. Private companies then rent irradiation time at the reactors, send the resulting medley of isotopes to processing plants, book the final Mo-99 on commercial flights back to the US, and distribute it to hospitals and pharmacies.

    With just a 66-hour half-life, Mo-99’s trip has to be fast. “It’s like running through the desert with an ice cream cone,” Ira Goldman, senior director of global strategic supply at Lantheus Medical Imaging in North Billerica, Massachusetts, told KHN.
    ...
    https://arstechnica.com/science/2018...medicine-race/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
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  7. #1027
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    Opá isso era fantástico

  8. #1028
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    A salamander with a genome 10 times the size of ours regrows lost limbs
    Most of the extra DNA appears to be irrelevant to regeneration.

    https://arstechnica.com/science/2018...ws-lost-limbs/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  9. #1029
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    Odd vertebrate gets rid of hundreds of genes early in development
    Mice silence these genes during development; sea lampreys just delete them.
    ...
    Sea lampreys have several traits that other (jawed) vertebrates do not, suggesting that these traits either (a) were present in our last shared ancestor and lost by us or (b) arose since lampreys diverged from the jawed vertebrate lineage. One of these traits is a real oddity: programmed genome rearrangement. During this process, sea lampreys jettison about 20 percent of their genome during embryonic development. A few cells don't undergo this process, and these go on to pass on the otherwise missing DNA to another generation.
    ...
    https://arstechnica.com/science/2018...n-development/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
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  10. #1030
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    Cancer "Vaccine" Eliminates Tumors in Mice

    In what some are calling a breakthrough, researchers at Stanford University found that 87 of 90 mice were cured of cancer after their solid tumors were injected with immune-stimulating agents. These injections caused the tumors to regress, eliminating even distant metastases.

    https://www.hardocp.com/news/2018/02...tumors_in_mice
    Fortresses, farmlands of the Maya emerge from massive LiDAR survey
    Huge sprawl of the civilization emerges from beneath the foliage.

    https://arstechnica.com/science/2018...snake-kingdom/
    Última edição de ímpar : 04-02-2018 às 22:16
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  11. #1031
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    Trump’s budget wants the US to stop watching the planet
    NSF and NIH see huge cuts restored, but anything environmental is in trouble.

    https://arstechnica.com/science/2018...ng-the-planet/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
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  12. #1032
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    Op-ed: The story behind the satellite that Trump wants dead
    It’s difficult to describe all the ways this is stupid.

    https://arstechnica.com/science/2018...mp-wants-dead/
    “Injury to widespread brain networks” in victims of mystery attacks in Cuba
    Doctors stumped by sonic experiences, doubt cause is viruses, delusions, or chemicals.

    https://arstechnica.com/science/2018...tacks-in-cuba/
    Scientist Gets Photo of a Single Atom

    A student at the University of Oxford managed to take a photo of a single floating atom with an ordinary camera. PhD candidate David Nadlinger used long exposure to capture the image of a single strontium atom illuminated by a laser while suspended in an ion trap. The photo win David the top prize in the Engineering and Physical Sciences Research Council's (EPSRC) photography competition.

    https://www.hardocp.com/news/2018/02...to_single_atom
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
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