- Microbial Ecology 31
- Computational Intelligence 30
- Tribology, Corrosion and Coatings 28
- Computers and Education 27
- Science Education 27
- Biomaterials 25
- Biomedical Engineering and Bioengineering 21
- Ecotoxicology 17
- Environmental Management 17
- Materials Engineering 17
- Quality Control, Reliability, Safety and Risk 17
- Sustainable Development 17
- Applied Microbiology 10
- Biomedical Engineering/Biotechnology 10
- Environmental Engineering/Biotechnology 10
- Materials Science, general 8
- Chemistry/Food Science, general 7
- Behavioral Therapy 6
- Virology 6
- Artificial Intelligence 5