Re: Pinhole Digest #931 - 05/27/02

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From: Trudelle, Paul (ptrudelle@woodsidepriory.com)
Date: Mon May 27 2002 - 13:12:59 PDT 

Message-Id: <200205272010.g4RKAqp16651@isaac.exploratorium.edu>
Date: Mon, 27 May 2002 13:12:59 -0700
From: "Trudelle, Paul" <ptrudelle@woodsidepriory.com>
Subject: Re: Pinhole Digest #931 - 05/27/02

Thanks so much Sue. Paul

-----Original Message-----
From: "Pinhole Listserv" <pinhole@exploratorium.edu>
To: "Pinhole Listserv" <pinhole@exploratorium.edu>
Date: Mon, 27 May 2002 00:20:01 -0700
Subject: Pinhole Digest #931 - 05/27/02

> Pinhole Digest #931 - Monday, May 27, 2002
>
> new amino acid
> by <pauld@exploratorium.edu>
> Re: pinhole battery questions
> by <NFetter@aol.com>
>
>
> ----------------------------------------------------------------------
>
> Subject: new amino acid
> From: <pauld@exploratorium.edu>
> Date: Sun, 26 May 2002 17:16:15 US/Pacific
>
> Hi Pinholers
> Here's a note from one of my science writer friends.
>
> **
>
> According to the current issue of Science: "Two complementary reports
> (1, 2), on pages 1459 and 1462 of this issue, provide compelling
> evidence that the genetic code of certain Archaea and eubacteria
> encodes
> a 22nd amino acid. This nonstandard amino acid, called pyrrolysine, is
> encoded by the RNA nucleotide triplet UAG, a stop codon that halts
> translation of mRNA."
>
> Dean Haycock
>
>
> Paul D
>
>
> --------------------------------------------------
> This message was sent using Exploratorium web mail
> http://www.exploratorium.edu/
>
>
>
> ----------------------------------------------------------------------
>
> Subject: Re: pinhole battery questions
> From: <NFetter@aol.com>
> Date: Mon, 27 May 2002 01:51:37 EDT
>
> Hi Geoff,
> Paul is close to the right answer about galvanic cells. The rate of
> discharge
> is controlled mainly by the migration of ions in the elctrolyte and by
> the
> polarization of the electrode surfaces. In the cells you make at
> school, the
> ions flow is very slow, hence the discharge rate is also very slow--the
> electrodes are usually far apart. In a car battery, the electrodes are
> large
> and very close together, hence they can deliver very currents of
> arouund 100
> A. However, even lead-acid car batteries have some internal resistance
> and if
> shorted, the sulfuric acid solution in the battery will boil and the
> battery
> will explode. I saw that happen once.
> Neil Fetter
>
> ----------------------------------------------------------------------
> End of Pinhole Digest
>
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