Chemistry 270 Dissertations, Academic (Ph.D) 203 Thesis (Ph.D)-Chemistry 186 Chemical technology 158 Chemical engineering 122 Biochemistry 101 Chemical reactions 101 Biotechnology 79 Chemical bonds 75 Chemical kinetics 72 Thermodynamics 61 Polymers 53 Chemistry, Analytic 52 Synthesis 46 Chemical analysis 42 Chemistry, Organic 41 Polymerization 38 Organic chemistry 37 Environmental chemistry 34 Pharmacology and Toxicology 33 Chemicals 32 Chemistry, Physical and theoretical 32 Soil Science and Agricultural Chemistry 32 Analytical chemistry 31 Molecular biology 31 Congresses 30 Organic compounds 30 Catalysis 28 Agronomy 27 Chemical elements 27