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Article
Distribution of denitrifying bacterial communities in the stratified water column and sediment–water interface in two freshwater lakes and the Baltic Sea
We have studied the distribution and community composition of denitrifying bacteria in the stratified water column and at the sediment–water interface in lakes Plußsee and Schöhsee, and a near-shore site in th...
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Article
Open AccessPhylogenetic and functional marker genes to study ammonia-oxidizing microorganisms (AOM) in the environment
The oxidation of ammonia plays a significant role in the transformation of fixed nitrogen in the global nitrogen cycle. Autotrophic ammonia oxidation is known in three groups of microorganisms. Aerobic ammonia...
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Article
Open AccessCommunity analysis of betaproteobacterial ammonia-oxidizing bacteria using the amoCAB operon
The genes and intergenic regions of the amoCAB operon were analyzed to establish their potential as molecular markers for analyzing ammonia-oxidizing betaproteobacterial (beta-AOB) communities. Initially, sequenc...
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Article
Open AccessMolecular analysis of enrichment cultures of ammonia oxidizers from the Salar de Huasco, a high altitude saline wetland in northern Chile
We analyzed enrichment cultures of ammonia-oxidizing bacteria (AOB) collected from different areas of Salar de Huasco, a high altitude, saline, pH-neutral water body in the Chilean Altiplano. Samples were inoc...
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Chapter
Viruses
Bacteriophages are viruses that infect bacteria and cyanobacteria, their host cells. Since their discovery at the beginning of this century (Twort 1915, d’Hérelle 1914), studies on the interaction between phag...
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Chapter
Approaches to Bacterial Population Dynamics
Studies on the structure of phyto- and zooplankton communities have been numerous in aquatic ecology. They have contributed considerably to our knowledge of species composition, genetic population structure, a...
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Article
Heterotrophic nitrification by Arthrobacter sp. (strain 9006) as influenced by different cultural conditions, growth state and acetate metabolism
An Arthrobacter sp. (strain 9006), isolated from lake water, accumulated nitrite up to about 15 mg N/l, but no nitrate. In a mineral medium supplemented with tryptone, yeast extract, acetate and ammonium, the cel...
