Studies on the biosynthesis of blood pigments. 2. Haem and porphyrin formation in intact chicken erythrocytes

In Vitro Pyrrole and Porphyrin Synthesis in Lead Poisoning and Iron Deficiency*

“…(26). Uroporphyrin was determined by the method of Dresel and Tooth (27) as outlined by Dresel and Falk (28). On a number of occasions, after the complete extraction of coproand protoporphyrins with 15% HCl, the ethyl acetate layer was tested for the presence of porphyrinogens.…”

Investigations of the Role of Iron in Chlorophyll Metabolism I. Effect of Iron Deficiency on Chlorophyll and Heme Content and on the Activities of Certain Enzymes in Leaves

“…Previous investigations (7,10,15) established that the concentrations of heme and chlorophyll in leaves are correlated with each other and with the level of iron in the nutrient medium. It was reported (15) that the activities of the enzymic systems involved in the synthesis of protoporphyrin from baminolevulinic acid (b-AL) were not reduced by iron deficiency, yet protoporphyrin failed to accumulate in iron-deficient leaves unless the tissue was incubated in the dark with b-AL.…”

Studies on "Haemixodovin", the Pigment in the Eggs of the Cattle Tick Boophilus Microplus(Acarnia: Ixodidae)

“…Accordingly, Boophilus eggs were extracted with ethyl acetate-acetic acid (3 : 1) and the extract was examined for haem and free porphyrins (cf. Dresel and Falk 1956). No free porphyrins were present, but spectroscopic examination indicated the presence of haem.…”