Chemistry 285 Dissertations, Academic (Ph.D) 203 Thesis (Ph.D)-Chemistry 186 Chemical technology 158 Chemical engineering 122 Biochemistry 103 Chemical reactions 101 Biotechnology 81 Chemical bonds 75 Chemical kinetics 72 Thermodynamics 67 Chemistry, Analytic 56 Polymers 54 Synthesis 47 Chemical analysis 42 Chemistry, Organic 42 Organic chemistry 40 Polymerization 40 Chemistry, Physical and theoretical 36 Environmental chemistry 35 Molecular biology 33 Pharmacology and Toxicology 33 Analytical chemistry 32 Chemicals 32 Organic compounds 32 Soil Science and Agricultural Chemistry 32 Congresses 30 Group theory 29 Catalysis 28 Physical chemistry 28