J
Jan Panteltje
Guest
On a sunny day (Tue, 26 Sep 2023 08:41:46 +0100) it happened Martin Brown
<\'\'\'newspam\'\'\'@nonad.co.uk> wrote in <ueu1vt$2dds1$1@dont-email.me>:
Ah, yes I had already found that one from the wikipedi links!
>There are many more single shot chemical clocks aka time fuses.
Here an other one, today, now trying to use AI to discriminate between life and non-life samples:
https://www.sciencedaily.com/releases/2023/09/230925153744.htm
\' Did life exist on Mars? Other planets? With AI\'s help, we may know soon\'
Well, .. for what it is worth.
But maybe AI should / could be considered less biased..
OTOH 90% leaves enough space for deniers...
<\'\'\'newspam\'\'\'@nonad.co.uk> wrote in <ueu1vt$2dds1$1@dont-email.me>:
On 26/09/2023 05:27, Jan Panteltje wrote:
On a sunny day (Mon, 25 Sep 2023 09:25:27 +0100) it happened Martin Brown
\'\'\'newspam\'\'\'@nonad.co.uk> wrote in <uerg5p$1qoba$1@dont-email.me>:
A decade later Zhabotinsky figured out the reactions and succeeded in
publishing it but it wasn\'t until an international conference in 1968
that western chemists became aware of it. It was a huge surprise since
it was a very simple recipe with incredibly complex behaviour.
It is possible to build reaction vessels to implement a nand gate in
this liquid chemistry environment so it is formally Turing complete!
https://en.wikipedia.org/wiki/BelousovâZhabotinsky_reaction
I wouldn\'t rule out other life forms using chemical energy rather than
photosynthesis (like at black smokers on Earth) but I think it is a bit
far fetched for them to be other than carbon, sulphur or maybe silicon
based. No other elements can support a varied enough chemistry.
Thank you for the link, took a while to read it all.
It is a really beautiful demo reaction for schools - especially in a
petri dish on an OHP (remember them?). I first saw it when George Porter
did it at the Royal Institution Xmas lectures in 1969 - unfortuately the
BBC tapes for that are missingHe was *very* good. The B-Z reaction
was practically unknown in the West when he first showed it apart from
to a select few who had been at the conference the previous year.
https://www.rigb.org/christmas-lectures/watch-royal-institution-christmas-lectures-archive
Provided that you use distilled water (has to be chlorine/chloride free)
the recipe is very forgiving and works in almost all reasonable
proportions of bromate/perbromate and malonic acid. It is yellow to
clear with just cerium catalyst in and red to blue if you add Ferroin
indicator. It is by far the easiest chemical clock known.
The 1921 Brey/Leibhafsky iodide/iodate one with peroxide is by
comparison incredibly tetchy and only works if the wind is in the right
direction even for an experienced chemist (they too were not believed).
More on chemical clocks here:
https://en.wikipedia.org/wiki/Chemical_oscillator
Ah, yes I had already found that one from the wikipedi links!
>There are many more single shot chemical clocks aka time fuses.
Here an other one, today, now trying to use AI to discriminate between life and non-life samples:
https://www.sciencedaily.com/releases/2023/09/230925153744.htm
\' Did life exist on Mars? Other planets? With AI\'s help, we may know soon\'
Well, .. for what it is worth.
But maybe AI should / could be considered less biased..
OTOH 90% leaves enough space for deniers...