Summary Summary. Acute intermittent porphyria (AIP) is one of the liver (hepatic) porphyrias. AIP is caused by low levels of porphobilinogen deaminase (PBGD), an enzyme also often called hydroxymethylbilane synthase.
Pyridine-N-oxide is the heterocyclic compound with the formula C 5 H 5 NO. This colourless, hygroscopic solid is the product of the oxidation of pyridine. It was originally prepared using peracids as the oxidising agent. The molecule is planar.yridine-N-oxide is the heterocyclic compound with the formula C 5 H 5 NO. This colourless, hygroscopic solid is the product of the oxidation of pyridine. It was originally prepared using peracids as the oxidising agent. The molecule is planar.
Pyrite. Pyrite is the most abundant and widespread sulfide mineral (FeS 2). Pyrite rarely makes up the bulk of the rock but it frequently occurs in many highly variable rock types. It is a common mineral in sedimentary rocks, especially if they contain or contained organic matter.t is called massive because it is indeed full of pyrite and contains little else. Here is an example of pyrite as a rock type. This sample of basalt, pyrite and quartz is part of a stockwork below the the massive sulfide lens in Cyprus.