- Atmospheric Protection/Air Quality Control/Air Pollution 5
- Ecology 5
- Ecotoxicology 5
- Environment, general 5
- Environmental Chemistry 5
- Environmental Health 5
- Freshwater & Marine Ecology 5
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 5
- Animal Genetics and Genomics 3
- Life Sciences, general 3
- Microarrays 3
- Microbial Genetics and Genomics 3
- Physical Chemistry 3
- Plant Genetics and Genomics 3
- Plant Physiology 3
- Plant Sciences 3
- Proteomics 3
- Biomedicine, general 2
- Control Structures and Microprogramming 2
- Energy Systems 2