Pág 52 de 52 PrimeiroPrimeiro ... 242505152
Resultados 1,021 a 1,027 de 1027

Tópico: Curiosidades Científicas

  1. #1021
    2n-1 Avatar de ímpar
    Data de Registo
    Nov 2003
    Local
    No Estado A Que Chegámos
    Posts
    15,607

    Default

    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…


    Avaliação Compras/Vendas

  2. #1022
    2n-1 Avatar de ímpar
    Data de Registo
    Nov 2003
    Local
    No Estado A Que Chegámos
    Posts
    15,607

    Default

    Boas!

    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…


    Avaliação Compras/Vendas

  3. #1023
    2n-1 Avatar de ímpar
    Data de Registo
    Nov 2003
    Local
    No Estado A Que Chegámos
    Posts
    15,607

    Default

    Boas!

    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…


    Avaliação Compras/Vendas

  4. #1024
    2n-1 Avatar de ímpar
    Data de Registo
    Nov 2003
    Local
    No Estado A Que Chegámos
    Posts
    15,607

    Default

    Boas!

    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…


    Avaliação Compras/Vendas

  5. #1025
    2n-1 Avatar de ímpar
    Data de Registo
    Nov 2003
    Local
    No Estado A Que Chegámos
    Posts
    15,607

    Default

    Boas!

    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…


    Avaliação Compras/Vendas

  6. #1026
    2n-1 Avatar de ímpar
    Data de Registo
    Nov 2003
    Local
    No Estado A Que Chegámos
    Posts
    15,607

    Default

    Boas!

    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;
    E nós aqui sem parar numa Terra a girar…


    Avaliação Compras/Vendas

  7. #1027
    Old School Member
    Data de Registo
    Jul 2007
    Local
    Terceira. Açores
    Posts
    5,162

    Default

    Opá isso era fantástico

Bookmarks

Bookmarks

Regras para postar

  • Não pode criar novas threads
  • Não pode responder a tópicos
  • Não pode colocar attachments
  • Não pode editar os seus posts
  •