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Université de Neuchâtel

Comparative analysis of ammonia monooxygenase (amoA) genes in the water column and sediment–water interface of two lakes and the Baltic Sea

Ok-Sun, Kim ; Junier, Pilar ; Imhoff, Johannes F ; Witzel, Karl-Paul

In: FEMS Microbiology Ecology, 2008, vol. 66, no. 2, p. 367–378

The functional gene amoA was used to compare the diversity of ammonia-oxidizing bacteria (AOB) in the water column and sediment–water interface of the two freshwater lakes Plußsee and Schöhsee and the Baltic Sea. Nested amplifications were used to increase the sensitivity of amoA detection, and to amplify a 789-bp fragment from which clone libraries were prepared. The larger...

Université de Neuchâtel

Phylogenetic and functional marker genes to study ammonia-oxidizing microorganisms (AOM) in the environment

Junier, Pilar ; Molina, Verónica ; Dorador, Cristina ; Hadas, Ora ; Kim, Ok-Sun ; Junier, Thomas ; Witzel, Karl-Paul ; Imhoff, Johannes F

In: Applied Microbiology and Biotechnology, 2010, vol. 85, no. 3, p. 425-440

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-oxidizing bacteria and archaea convert ammonia into nitrite during nitrification. Anaerobic ammonia-oxidizing bacteria (anammox) oxidize ammonia using nitrite as electron acceptor and...

Université de Neuchâtel

Habitat partitioning of denitrifying bacterial communities carrying nirS or nirK genes in the stratified water column of Lake Kinneret, Israel

Junier, Pilar ; Kim, Ok-Sun ; Witzel, Karl-Paul ; Imhoff, Johannes F ; Hadas, Ora

In: Aquatic Microbial Ecology, 2008, vol. 51, p. 129-140

The community composition of denitrifying bacteria was studied in the stratified water column of Lake Kinneret. The nitrite reductase genes nirS and nirK were amplified by PCR from water samples taken at 1, 14, 19 and 22 m depth, which represent the epi-, meta- and hypolimnion of the lake. The PCR products were analyzed with terminal restriction fragment length polymorphism (T-RFLP)...

Université de Neuchâtel

Genetic diversity of cyanobacterial communities in Lake Kinneret (Israel) using 16S rRNA gene, psbA and ntcA sequence analyses

Junier, Pilar ; Witzel, Karl-Paul ; Hadas, Ora

In: Aquatic Microbial Ecology, 2007, vol. 49, no. 3, p. 233-241

The genetic diversity of cyanobacterial communities was studied at various depths in Lake Kinneret (Israel). Denaturing gradient gel electrophoresis (DGGE) of specific 16S rRNA gene PCR products showed significant differences in the cyanobacterial community structure between epi- and hypolimnetic waters. Sequences of clone libraries prepared from 16S rRNA gene PCR products from epi- and...