protogen


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li·po·ic ac·id

(li-pō'ik as'id),
A bacterial growth factor present in yeast and liver extracts; may be useful in the treatment of mushroom poisoning. Functions as the amide (lipoamide) cofactor in the disulfide (-S-S-) form in the transfer of "active aldehyde" (acetyl), the two-carbon fragment resulting from decarboxylation of pyruvate from α-hydroxyethylthiamin pyrophosphate to acetyl-CoA, itself being reduced to the dithiol form (that is, dihydrolipoic acid) in the process. Lipoic acid is also an essential component of other α-keto acid dehydrogenase complexes.

protogen

(1) An obsolete term for a concentrate of natural substances, including lipoic acid, that is capable of sustaining the growth of Tetrahymena spp. 
(2) Thioctic acid, lipoic acid.
References in periodicals archive ?
This ISO certification also demonstrates that use of Watershed XC 11122 and ProtoGen 18420 contributes to the ability of medical-device developers to minimize product-development risks and maximize their prototyping confidence," says marketing manager Vince Adams.
The company says Watershed XC 11122 and ProtoGen 18420 can be recommended for use in applications that include medical-device prototypes, anatomical modeling, investment casting patterns (to produce implantable hip and knee joint replacements), hearing aid manufacturing, and surgical and dental drill guides, www.
The finds from Marjevka prove that, a century after the decree in honour of Protogens, some Celtic contingents appeared in the immediate area of Olbia.