Metals 69 Dissertations, Academic (Ph.D) 36 Heavy metals 34 Transition metals 26 Rare earth metals 23 Chemistry 20 Thesis (Ph.D)-Chemistry 15 Thesis (Ph.D)-Physics 14 Transition metal compounds 13 Organic compounds 12 Bioremediation 11 Metal complexes 11 Organometallic chemistry 11 Metal catalysts 10 Engineering 8 Organotransition metal compounds 8 Rare earth metal compounds 8 Analysis 7 Catalysis 7 Metallic composites 7 Synthesis 7 Alkaline earth metals-- Inorganic chemistry (Group 2A) 6 Heavy metal pollution 6 Metal oxide semiconductors, Complementary 6 Metal pollution 6 Nanostructured materials 6 Pesticides 6 Soil pollution 6 Biodegradation 5 Bioinorganic chemistry 5