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Nitrification and denitrification : probing the nitrogen cycle in aquatic environments

B. Ward | 1996

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Phylogenetic diversity of natural populations of ammonia oxidizers investigated by specific PCR amplification

B. Ward ; M. Voytek ; K. Witzel | 1997

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The distribution and relative abundance of ammonia-oxidizing bacteria in lakes of the McMurdo Dry Valley, Antarctica

M. Voytek ; J. Priscu ; B. Ward | 1999

Marked differences in the concentrations of major ions and cations, macronutrient chemistry and general trophic status exist among the lakes of the McMurdo dry valleys in Antarctica. These differences have been attributed to both variations in s[...]

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