title: Histochemical analysis of the haemopoietic tissue in Spirographis spallanzanii.
abstract: Physical and cytochemical techniques have demonstrated that in Spirographis spallanzanii there is a highly pigmented tissue surrounding the ventral and circular vessels. Melanin and carotenoids are absent in the clubshaped cells, but there is evidence for the presence of lipids, haemopigments and Fe+++, probably in connection with haemopoietic processes. Tests on the ala-dehydrase activity in this tissue confirm this hypothesis. From these results it can be concluded that in Spirographis spallanzanii this tissue is the site of synthesis of respiratory pigment.
mesh_terms: D000818:Animals; D001808:Blood Vessels / Q000166:cytology*; D002338:Carotenoids / Q000032:analysis; D006418:Heme / Q000032:analysis; D006651:Histocytochemistry; D008055:Lipids / Q000032:analysis; D008543:Melanins / Q000032:analysis; D011077:Polychaeta / Q000166:cytology*
chemical_list: D008055:Lipids; D008543:Melanins; D002338:Carotenoids; D006418:Heme