... located near the ostial openings on the intima, thus partly occluding them 95 Systemic Pathology Exercise 23 : Blood Vessels and Lymphatics FIGURE 23 .2: A, Diagrammatic view of the histologic appearance ... FIGURE 27 .5: Chronic peptic ulcer Histologic zones of the ulcer are illustrated The mucosal surface shows necrosis, ulceration, and inflammation 1 12 Exercise 27 : GIT I Systemic...
... metal-metal bonding is present MX2 compounds either have layer structures (e.g TiS2, TiSe2, TiTe2, all CdI2 types) or structures containing diatomic ions (e.g FeS2 has S 22 units and so is formally ... E-E bonding are known (see Topic D5) CaC2 has C 22 ions (isoelectronic with N2) and reacts with water to give ethyne C2H2 On the other hand, KSi and CaSi2 are Zintl compounds with single-bonded...