Tag: Encephalopathy
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Quadrigen (DPT combined with the Salk polio vaccine) – random notes
In 1959, the Parke-Davis Quadrigen vaccine (DPT combined with the Salk polio vaccine) is licensed. The vaccine is alleged to be particularly reactive because of the effect of the preservative on the pertussis component. Several lawsuits ensue. The vaccine is withdrawn from the market in 1968 (Coulter and Fisher, 1985). Institute of Medicine (US) Committee…
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Ommochrome (visual pigment) and Kynurenine (a metabolite of the amino acid l-tryptophan used in the production of niacin)
Ommochrome (or visual pigment) refers to several biological pigments that occur in the eyes of crustaceans and insects. The eye color is determined by the ommochromes. Ommochromes are also found in the chromatophores of cephalopods, and in spiders. Ommochromes are metabolites of tryptophan, via kynurenine and 3-hydroxykynurenine. They are responsible for a wide variety of colors, ranging from yellow over red and brown to black. Lighter colors tend to be generated by ommatins,…
