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Tópico: Curiosidades Científicas

  1. #1021
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    Boas!

    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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