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Science Forum

  1. Joined
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    25 Apr '20 16:49
    http://sunlightinstitute.org/sanitizing-with-sunlight-the-best-disinfectant-know/

    In reality, it has long been known that sunlight is a powerful disinfectant and bactericide. As early as 1877, researchers discovered that sugar water left in the shade became cloudy, indicative of bacterial growth, but if exposed to sunlight, it remained clear.[3]  In 1890, the German microbiologist Robert Koch (who had isolated and described the tuberculosis bacterium in 1882), showed that sunlight killed TB bacteria.[4] Later on, research showed sunlight also killed E. coli bacteria in twelve feet of seawater and in waste stabilization ponds.[5] [6] [7]


    More evidence that the key to stopping this virus is sunlight.
  2. Joined
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    25 Apr '20 19:51
    @eladar said
    http://sunlightinstitute.org
    I would call this delusional, but it isn't even that.

    Tomorrow, from eladar: "Capricorns are more suscepible to viruses than Virgos; experts still unsure about Fire Rabbits ".
  3. Subscriberlemondrop
    pawn grabber
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    25 Apr '20 19:55
    @eladar said
    http://sunlightinstitute.org/sanitizing-with-sunlight-the-best-disinfectant-know/

    In reality, it has long been known that sunlight is a powerful disinfectant and bactericide. As early as 1877, researchers discovered that sugar water left in the shade became cloudy, indicative of bacterial growth, but if exposed to sunlight, it remained clear.[3]  In 1890, the German microbi ...[text shortened]... stabilization ponds.[5] [6] [7]


    More evidence that the key to stopping this virus is sunlight.
    hand grenades will also kill the virus
  4. Joined
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    25 Apr '20 20:27
    Lol, can you counter the arguments being made? Are they false?

    Or can you only claim fake news, cover your eyes mouth and ears and move on?

    Seems to me that most people around here are too ignorant to counter arguments. They are simply overgrown infants with no actual thoughts other than to believe the correct source of propaganda.
  5. Subscribersonhouse
    Fast and Curious
    slatington, pa, usa
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    25 Apr '20 20:42
    @Eladar
    It would only be the UVC component of sunlight killing viruses. There are units on the market that emit safe UVC that can sterilize a room. Something that sunlight alone cannot since little of it would get inside a room.
  6. Joined
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    25 Apr '20 21:031 edit
    @sonhouse said
    @Eladar
    It would only be the UVC component of sunlight killing viruses. There are units on the market that emit safe UVC that can sterilize a room. Something that sunlight alone cannot since little of it would get inside a room.
    Did you see the stats that were given by homeland security? It described the effect of summer sunlight on the coronavirus.
  7. Joined
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    25 Apr '20 21:128 edits
    @sonhouse said
    @Eladar
    It would only be the UVC component of sunlight killing viruses. There are units on the market that emit safe UVC that can sterilize a room. Something that sunlight alone cannot since little of it would get inside a room.
    UVC is far more effective than UVB at destroying DNA and RNA but all the UVC is blocked by the earth's upper atmosphere so no sunlight that reaches us, even outside in direct sunlight, has UVC.
    As for the UVB in sunlight, it is thought to have some effect on virus but not enough to help much with killing it. In addition, if you exposed yourself to enough UVB to kill all of the virus on your skin within a short period of time such as, say, within one hour, it would have to be such a massive dose that, at least if you had light colored skin, it would give you extreme sunburn and thus probably also kill you. Pitty.
    As for UVA in sunlight, it has close enough no effect on virus.
    So using sunlight as a "disinfectant" against this virus is pretty much a non-starter.
  8. Joined
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    25 Apr '20 21:231 edit
    @humy

    According to the US Homeland Security investigation, covid 19 has a 2 minute half life when exposed to summer level solar light.

    Typically it has an 18 hour half life.

    If we go back into history...

      In 1890, the German microbiologist Robert Koch (who had isolated and described the tuberculosis bacterium in 1882), showed that sunlight killed TB bacteria.

    Does sunlight kill TB bacteria?
  9. Joined
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    25 Apr '20 21:292 edits
    @eladar said
    @humy

    According to the US Homeland Security investigation, covid 19 has a 2 minute half life when exposed to summer level solar light.

    Typically it has an 18 hour half life.
    That was their claim but as far as I am aware that claimed result wasn't reproduced in other labs and according to some experts it must be false. So, until I see more credible evidence, I have to be pretty sceptical.


    As for killing certain bacteria, bacteria would generally be more sensitive to UVB so that wouldn't be evidence that sunlight would also be significantly effective against this virus. Obviously, sensitivity to sunlight will vary between different types of microbes.
  10. Joined
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    25 Apr '20 21:301 edit
      In 1890, the German microbiologist Robert Koch (who had isolated and described the tuberculosis bacterium in 1882), showed that sunlight killed TB bacteria.


    Was this false also?
  11. Joined
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    25 Apr '20 21:341 edit
    @eladar said
      In 1890, the German microbiologist Robert Koch (who had isolated and described the tuberculosis bacterium in 1882), showed that sunlight killed TB bacteria.


    Was this false also?
    See the last part of my previous post.
  12. Joined
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    25 Apr '20 21:37
    @humy said
    See the last part of my previous post.
    Can you site experiments that failed?
  13. Joined
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    25 Apr '20 21:451 edit
    @eladar said
    Can you site experiments that failed?
    Not yet but the signs don't look good;

    https://www.aljazeera.com/news/2020/04/sunlight-humidity-kill-coronavirus-fastest-scientists-200424065853466.html
    "...
    Dr Margaret Harris from the World Health Organization told Al Jazeera "the evidence is not supporting [the sunlight] theory".

    The research cited by Bryan has not yet been released for review, making it difficult for independent experts to comment on how robust its methodology was.
    A key question will be what the intensity and wavelength of the UV light used in the experiment was, and whether this accurately mimics natural light conditions in summer.

    Past studies have not found reliable evidence that warmer temperatures and the higher humidity of spring and summer will help tamp down the spread of the virus.
    ..."

    Time will tell.
  14. Joined
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    25 Apr '20 21:461 edit
    @humy said
    Not yet but the signs don't look good;

    https://www.aljazeera.com/news/2020/04/sunlight-humidity-kill-coronavirus-fastest-scientists-200424065853466.html
    "...
    Dr Margaret Harris from the World Health Organization told Al Jazeera "the evidence is not supporting [the sunlight] theory".

    The research cited by Bryan has not yet been released for review, making it difficult for ...[text shortened]... ures and the higher humidity of spring and summer will help tamp down the spread of the virus.
    ..."
    So no, you cannot site experiments that failed. All you can do is provide propaganda.
  15. Joined
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    25 Apr '20 21:49
    @eladar said
    So no, you cannot site experiments that failed. All you can do is provide propaganda.
    which part of that is "propaganda" and why?
    Is there any part of that you say is false?
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