Canada, Nitrogen - metabolism, Temperature, Acetylene - metabolism, Polymorphism, Restriction Fragment Length, Arctic Regions, Oxidoreductases - genetics, Soil Microbiology, Ecosystem, DNA Primers, Fertilizers
Antarctic Regions, Nitrogen - metabolism, DNA Fingerprinting, Oxidoreductases - genetics, Soil Microbiology, Greenhouse Effect, Genotype, Archaea - isolation & purification, Hot Temperature, Plants, Biodiversity, Archaea - classification, Bacteria - isolation & purification, Bacteria - classification, Cluster Analysis
Climate, Water resources, Weather, MANAGEMENT, Social aspects, Hydrology, Study and teaching, traditional knowledge, Science and the humanities