Re: Colloidal silver generator?

On Sat, 09 Apr 2005 16:37:51 +0100, John Woodgate wrote:
> I read in sci.electronics.design that Rich Grise <richgrise@xxxxxxxxxxx>
>>I had the impression that the dissolved O2 molecules are picked up more
>>or less mechanically by the hemoglobin and just sort of enclosed, without
>>combining chemically, which is what it sounds like Mike is referring to.
>>I could see how that difference could change the color.
>>But what do I know? ;-)
>
> Not the difference between 'find out' and 'guess', it seems.

Well, I was just going by what I "learned" many years ago.

But it seems nobody really knows:
http://www.chemistry.wustl.edu/~edudev/LabTutorials/Hemoglobin/MetalComplexinBlood.html

Oh - here it is:
"The ability of metal ions to coordinate with (bind) and then release
ligands in some processes, and to oxidize and reduce in other processes
makes them ideal for use in biological systems. The most common metal
used in the body is iron, and it plays a central role in almost all
living cells. For example, iron complexes are used in the transport of
oxygen in the blood and tissues.

"Metal-ion complexes consist of a metal ion that is bonded via
"coordinate-covalent bonds" (Figure 1) to a small number of anions or
neutral molecules called ligands. For example the ammonia (NH3) ligand
used in this experiment is a monodentate ligand; i.e., each monodentate
ligand in a metal-ion complex possesses a single electron-pair-donor
atom and occupies only one site in the coordination sphere of a metal
ion. Some ligands have two or more electron-pair-donor atoms that can
simultaneously coordinate to a metal ion and occupy two or more
coordination sites; these ligands are called polydentate ligands. They
are also known as chelating agents (from the Greek word meaning "claw"),
because they appear to grasp the metal ion between two or more
electron-pair-donor atoms. The coordination number for a metal refers to
the total number of occupied coordination sites around the central metal
ion (i.e., the total number of metal-ligand bonds in the complex)."

So, it's not like oxygenated blood has "hemoglobin oxide" in it, or
"rust" - they do seem to differentiate between binding with ligands vs.
oxidizing.

Cheers!
Rich


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