▪ Abstract Since the delineation of 12 bacterial phyla by comparative phylogenetic analyses
of 16S ribosomal RNA in 1987 knowledge of microbial diversity has expanded dramatically …

This review summarizes a decade of research in which we have used molecular methods, in
conjunction with more traditional approaches, to study hot spring cyanobacterial mats as …

Taxonomy is an organizing principle of biology and is ideally based on evolutionary
relationships among organisms. Development of a robust bacterial taxonomy has been …

Background Sediments are massive reservoirs of carbon compounds and host a large
fraction of microbial life. Microorganisms within terrestrial aquifer sediments control buried …

Few techniques are currently available for quantifying specific prokaryotic taxa in
environmental samples. Quantification of specific genotypes has relied mainly on …

A third or more of the fixed nitrogen lost from the oceans as N2 is removed by anaerobic
microbial processes in open ocean oxygen minimum zones. These zones have expanded …

The results of empirical studies have revealed links between phytoplankton and
bacterioplankton, such as the frequent correlation between chlorophyll a and bulk bacterial …

ABSTRACT A culture-independent molecular phylogenetic approach was used to survey
constituents of microbial communities associated with an aquifer contaminated with …

The mesopelagic zone is the oceanic region through which carbon and other elements must
pass in order to reach deeper waters or the sea floor. However, the food web interactions …

The history of microbial evolution in the oceans is probably as old as the history of life itself.
In contrast to terrestrial ecosystems, microorganisms are the main form of biomass in the …