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NYarvin's profile
Norman Yarvin
Norman Yarvin
Norman Yarvin
@NYarvin

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Norman Yarvin

@NYarvin

yarchive.net/blog
Joined April 2013

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    1. Stephen McIntyre‏ @ClimateAudit Apr 16
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      Replying to @Jamiepembs

      good.

      1 reply 0 retweets 2 likes
    2. Andrew Cross‏ @sors_tertia Apr 18
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      Replying to @ClimateAudit @Jamiepembs

      Not just door handles.. Salgado 2013 (US Dept of Defense) study found the top 6 worst items were bed rails, over-bed tables, nurse call units, visitor's chair arms, IV poles, computer input devices. 83% microbial burden reduction on the copper items vs standard ones!

      2 replies 0 retweets 1 like
    3. Stephen McIntyre‏ @ClimateAudit Apr 19
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      Replying to @sors_tertia @Jamiepembs

      the cost of copper surfaces is insignificant relative to cost of infections. It ought to have become standard long ago. Worker safety would seem to mandate copper surfaces. I wonder if hospital are subject to ordinary worker safety regulations or only to health regulations.

      2 replies 0 retweets 3 likes
    4. Norman Yarvin‏ @NYarvin Apr 19
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      Replying to @ClimateAudit @sors_tertia @Jamiepembs

      Brass is about as good. One thing about modern brass doorknobs and such, though, is that they are usually coated with a thin clearcoat to stop them from tarnishing, which of course kills their antimicrobial properties.

      2 replies 0 retweets 2 likes
    5. Norman Yarvin‏ @NYarvin Apr 19
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      Replying to @NYarvin @ClimateAudit and

      And then there's "brass" which is actually a thin coat of vapor deposited zirconium nitride. Looks exactly like brass, but doesn't tarnish and isn't antimicrobial.

      1 reply 0 retweets 0 likes
    6. Norman Yarvin‏ @NYarvin Apr 19
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      Replying to @NYarvin @ClimateAudit and

      Both with brass and copper, the biggest cost for a hospital is probably the time spent cleaning them (as in Brasso). Still likely worth it.

      2 replies 0 retweets 1 like
    7. Andrew Cross‏ @sors_tertia Apr 19
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      Replying to @NYarvin @ClimateAudit @Jamiepembs

      Brasso (or any polish/cleaner that leaves a wax or film on the surface) is not recommended for antimicrobial applications, as the wax/film inhibits the contact of microbes with the copper material

      1 reply 0 retweets 0 likes
    8. Andrew Cross‏ @sors_tertia Apr 19
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      Replying to @sors_tertia @NYarvin and

      Many of the standard clinical cleaning agents are compatible with copper alloys. Oxidation of these alloys does not inhibit their antimicrobial efficacy, studies show.

      1 reply 0 retweets 0 likes
    9. Norman Yarvin‏ @NYarvin Apr 19
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      Replying to @sors_tertia @ClimateAudit @Jamiepembs

      One set of numbers that I saw showed copper and copper(1) on par, and copper(2) substantially worse but still somewhat effective. That was just one study, though. Anyway, when brass gets green, hospitals are going to want to polish it, even if only to keep up appearances.

      2 replies 0 retweets 0 likes
    10. Andrew Cross‏ @sors_tertia Apr 19
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      Replying to @NYarvin @ClimateAudit @Jamiepembs

      Happy to read further references on this. Am using my phone, out of office, so my reference library not to hand. Brass is most likely to darken in indoor use. If green, something odd has been in contact with it. Regular handling keeps items bright, like this unlacquered pen.pic.twitter.com/MA9U5XIRdW

      1 reply 0 retweets 0 likes
      Norman Yarvin‏ @NYarvin Apr 19
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      Replying to @sors_tertia @ClimateAudit @Jamiepembs

      I'm not sure which paper I read that in, and would have a hard time finding it again. It seems more appropriate to defer to your knowledge here.

      2:17 PM - 19 Apr 2020
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Andrew Cross‏ @sors_tertia Apr 19
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          Replying to @NYarvin @ClimateAudit @Jamiepembs

          Sorry if I came across wrongly there. I'm genuinely keen to hear of all developments, to stay updated in this topic. References make it much easier to analyse excerpts :)

          1 reply 0 retweets 0 likes
        3. Norman Yarvin‏ @NYarvin Apr 19
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          Replying to @sors_tertia @ClimateAudit @Jamiepembs

          No offense taken. It just really would be hard for me to find that reference again; sometimes I save them, but not here, and in any case I haven't even tried to do a thorough job of surveying the literature, and am happy to listen to someone who has.

          0 replies 0 retweets 1 like
        4. End of conversation

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