Related by context. Frequent words. (Click for all words.) 62 denitrification 56 nitrogen fixation 54 ionic liquid 53 isoprene 52 biogenic 52 abiotic 52 sulfate 52 nitrogen fixing 52 carbonic acid 51 polymerization 51 zeolites 51 oxidant 51 hydrothermal 51 acrolein 50 hydroxide 50 marine sediments 50 terrestrial ecosystems 50 electrochemical 50 nitrogen 50 gallium 50 hydrolysis 50 microorganisms 50 adsorption 50 cofactor 50 reactants 50 biogeochemistry 50 biofilm formation 50 anoxic 50 ionic liquids 49 disinfection byproducts 49 activated sludge 49 naturally occurring bacteria 49 diatoms 49 eukaryotic 49 Hydrogen sulfide 49 acetylation 49 oxidants 49 speciation 49 geosequestration 49 atmospheric CO 49 sulphates 49 quorum sensing 49 Saccharomyces cerevisiae 48 metabolic pathway 48 anaerobic bacteria 48 micelles 48 livestock manure 48 biophysical 48 methane 48 photosynthetic 48 metal oxides 48 hydride 48 volatiles 48 Oxidation 47 lysozyme 47 ammonium 47 naturally occurring 47 infrared spectroscopy 47 neutral pH 47 Caenorhabditis elegans 47 sulphate 47 iron oxides 47 x ray crystallography 47 contaminant 47 iron fertilization 47 transgenic plants 47 alkali 47 hydrogen ions 47 chloramine 47 algal 47 glycosylation 47 oligosaccharides 47 transduction 47 confocal microscopy 47 chlorinated solvents 47 Plasmodium 47 microfossils 47 laboratory experiments 47 magnetic resonance spectroscopy 47 microorganism 47 acidified 47 bioremediation 47 micro organism 47 naturally occurring substance 47 acute toxicity 47 endotoxins 47 renewable feedstocks 46 NMR spectroscopy 46 microbiota 46 micro organisms 46 cyanobacteria 46 chloroplasts 46 organic acids 46 protozoa 46 glycerol 46 adsorbed 46 enzymatic 46 radiolabeled 46 nitrous oxide emissions 46 atmospheric methane 46 iron oxide