Soil enzymes Biochemistry and Physiology of Microorganisms, (New March 2000) 3 Soil Biology 3 Genetics and Molecular Biology of Microorganisms, (New March 2000) 2 Microbial activities 2 Nitrogen fixation 2 Nodulation 2 Soil fertility 2 Soils 2 Techniques and Methodology 2 Agrochemicals 1 Analytical methods 1 Aquatic Biology and Ecology 1 Aquatic environment 1 Biological activity in soil 1 Carbon cycle 1 Chemical speciation 1 Chromatography 1 Denitrification 1 Ecosystems 1 Energy transformations 1 Enzyme activity 1 Genome analysis 1 Genomes 1 Hydrolysis 1 Mass spectrometry 1 Mathematics and Statistics 1 Microbial Ecology, (New March 2000) 1 Microbial diversity 1 Microbial ecology 1