Re: [ccp4bb] Eleven plausible phasing elements remain unused

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CCP4bb <-- 1999 <-- November 1999 <-- 30 November 1999

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From: Simon Kolstoe s {- dot -} kolstoe {- at -} UCL {- dot -} AC {- dot -} UK
Date: 2009-04-02

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Subject: Re: Eleven plausible phasing elements remain unused
From: Thomas Womack twomack {- at -} GLOBALPHASING {- dot -} COM
Date: 2009-04-02

On Wed, 2009-04-01 at 14:33 -0700, Ethan Merritt wrote:
> On Wednesday 01 April 2009 07:21:16 Thomas Womack wrote:
> > A perusal of the PDB reveals that the game of Periodic Table bingo still
> > has eleven rounds to run:
> >
> > scandium, titanium, germanium, zirconium, niobium, neodymium,
> > dysprosium, thulium, hafnium, bismuth and thorium remain absent from PDB
> > entries.
>
> Does this imply that there is a PDB entry containing Radon?

I defined 'plausible' as a half-life greater than a billion years,
though I wouldn't have been totally amazed to see a plutonium or
technetium derivative. Elements with half-lives 10^6 to 10^9 years for
the most stable isotope are Np, Tc, Cm, Pu; next shortest is 31kyears
for 231Pa. The long-lived curium-247 and plutonium-244 isotopes are
neutron-heavy and inconvenient to produce.

The web-accessible subset of the ICSD features a technetium arsenide, a
plutonium boride, a sodium neptunate(VII) and an americium iodide.

Tom

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CCP4bb <-- 1999 <-- November 1999 <-- 30 November 1999

Previous message:
Subject: CCP4 tcl installation problem (mac)
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