Karl Paul Witzel

TL;DR: The data suggest that amoA represents a very powerful molecular tool for analyzing indigenous ammonia-oxidizing communities due to (i) its specificity, (ii) its fine-scale resolution of closely related populations, and (iii) the fact that a functional trait rather than a phylogenetic trait is detected.

TL;DR: This review summarizes aspects of the current knowledge about the ecology of ammonia-oxidizing and denitrifying bacteria and indicates that the composition of nitrifying and denItrifying communities is complex and apparently subject to large fluctuations, both in time and in space.

TL;DR: The phylum Bacteroidetes represents one of the most abundant bacterial groups of marine and freshwater bacterioplankton and its similarity with their closest relatives in GenBank was typically <97% and notably lower when compared with type strains, demonstrating the unique character of these sequences.

TL;DR: The diversity of cyanobacteria in water and sediment samples from four representative sites of the Salar de Huasco was examined using denaturing gradient gel electrophoresis and analysis of clone libraries of 16S rRNA gene PCR products.

TL;DR: Analysis of the glyoxylate cycle key enzymes in washed suspensions incubated in a minimal medium revealed that isocitrate lyase and malate synthase were most active during the nitrification phase, indicating an involvement of acetate metabolism with nitrification.