Industrial exposure to gases and fumes may produce a wide variety of respiratory damage including tracheobronchial inflammation and parenchymal damage.' Tracheobronchial inflammation is reported, particularly after exposure to chlorine, ammonia, and sulphur dioxide. Interstitial pneumonitis has been associated with the inhalation of oxides of nitrogen,2 cadmium,3 manganese,4 mercury,5 and resin...

Dehydroacetic acid reacts with acetic anhydride in the presence of perchloric acid to give a salt which upon careful neutralization affords a fused bis-gamma-pyrone. The bis-gamma-pyrone forms stable metal complexes with Li, Mg, Cu(II), Ni(II), Zn, Fe(II), Co(II) and Ba perchlorates whose crystal structures reveal that the ligand possesses significant bispyrylium character while the metal is co...

Abstract Acetylation is a method of chemically modified starch that can be used to improve the physicochemical properties starch. The aim study was obtain pH and concentration acetic anhydride which gave best effect on characteristics acetylated sago arranged using completely randomized design with factorial pattern in combination suspension 7.0; 8.0; 9.0 10.0 concentrations 3%, 6%, 9%, 12% 15%...