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Difference between Protoporphyrin and Porphyrin?

From here: Protoporphyrin is a derivative of porphyrin. The key difference between porphyrin and protoporphyrin is that porphyrin is a group of aromatic chemicals which has four modified pyrrole ...
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Will iron(III) sodium EDTA release its nitrogen into a water medium and become bioavailable to aquatic plants?

This paper which discusses microbial degradation of EDTA is the most relevant I could find. It identifies the major products of degradation: Included among these compounds were both isomers of ...
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