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Platinum

platinum

(Science: chemistry) A metallic element, intermediate in value between silver and gold, occurring native or alloyed with other metals, also as the platinum arsenide (sperrylite). It is heavy tin-white metal which is ductile and malleable, but very infusible, and characterised by its resistance to strong chemical reagents. It is used for crucibles, for stills for sulphuric acid, rarely for coin, and in the form of foil and wire for many purposes. Specific gravity 21.5. Atomic weight 194.3. Symbol pt. Formerly called platina.

(Science: chemistry) Platinum black, a soft, dull black powder, consisting of finely divided metallic platinum obtained by reduction and precipitation from its solutions. It absorbs oxygen to a high degree, and is employed as an oxidizer.

(Science: physics) Platinum lamp, metallic platinum in a gray, porous, spongy form, obtained by reducing the double chloride of platinum and ammonium. It absorbs oxygen, hydrogen, and certain other gases, to a high degree, and is employed as an agent in oxidizing.

Origin: NL, fr. Sp. Platina, from plata silver, LL. Plata a thin plate of metal. See Plate, and cf. Platina.

S 39a ource: Websters Dictionary


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Re: Generation of DNA nucleotides

If you had e.g. ethene and hydrogen, nothing will happen. But add some platinum and you will get ethane. You're right, there are countless examples in chemistry, I'm sure. But don't you agree that in biochemistry, things happen at a different level? Isn't the ...

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by gs99
Fri Jan 15, 2010 6:43 pm
 
Forum: Molecular Biology
Topic: Generation of DNA nucleotides
Replies: 65
Views: 59184

Generation of DNA nucleotides

... all molecules to react in the correct orientation and stuff like that. If you had e.g. ethene and hydrogen, nothing will happen. But add some platinum and you will get ethane. That is catalysis. But the platinum is still not alive ;)

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by JackBean
Fri Jan 15, 2010 4:44 pm
 
Forum: Molecular Biology
Topic: Generation of DNA nucleotides
Replies: 65
Views: 59184

Tools for studying cells question

... "etched" by increasing the temperature to about -100°C for several minutes to let some ice sublime) is then shadowed with evaporated platinum or gold at an average angle of 45° in a high vacuum evaporator. A second coat of carbon, evaporated perpendicular to the average surface plane ...

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by MrMistery
Fri Dec 26, 2008 6:07 pm
 
Forum: Cell Biology
Topic: Tools for studying cells question
Replies: 2
Views: 4485

What gas is liberated from hydrogen peroxide?

platinum is used in cars, definitely inorganic and not found in organism.

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by mith
Fri Oct 26, 2007 10:14 pm
 
Forum: Molecular Biology
Topic: What gas is liberated from hydrogen peroxide?
Replies: 11
Views: 5349

questions regarding denaturation

inorganic catalyst: platinum. Can you dentaure that? enzyme=protein. Can you denture that?

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by canalon
Thu Oct 18, 2007 1:25 am
 
Forum: Molecular Biology
Topic: questions regarding denaturation
Replies: 4
Views: 3071
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