Niche-partitioning of Prochlorococcus populations in a stratified water column in the eastern North Atlantic Ocean

Article Abstract:

The in situ community structure of Prochlorococcus populations in the eastern North Atlantic Ocean was examined by analysis of Prochlorococcus 16S rDNA sequences via cloning and sequencing, hybridization to specific oligonucleotide probes and denaturing gradient gel electrophoresis. Observations of a partitioning of Prochlorococcus genotypes in a stratified water column provide a genetic basis for the dim and bright Prochlorococcus populations observed in flow cytometric signatures in several oceanic provinces.

Natural history, Gel electrophoresis, Nucleic acid probes, North Atlantic Ocean, Marine phytoplankton

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Detection of stratified microbial populations related to Chlorobium and Fibrobacter species in the Atlantic and Pacific Oceans

Article Abstract:

Phylogenetic analyses indicate that the SAR406 gene lineage occurring in 16S rRNA gene clone libraries from the Atlantic and Pacific Oceans is related to the genus Fibrobacter and the green sulfur bacteria. The stratified microbial populations are widespread in the Sargasso Sea and occur below the chlorophyll layer. The clone libraries are prepared using PCR and primers to amplify the 16S rRNA genes.

Methods, Polymerase chain reaction, Cloning, Marine microbiology

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Colonization of the stratified squamous epithelium of the nonsecreting area of horse stomach by lactobacilli

Article Abstract:

Researchers have discovered several species of Lactobacillus that appear to exist symbiotically in the stomach of horses. Although they created a dense layer on the epithelium as is commonly seen in mice, rats, and pigs, many of the species adhered to horse epithelial cells but not to rat epithelial cells.

Physiological aspects, Horses, Digestive organs, Digestive system

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