Purple sulfur bacteria control the growth of aerobic heterotrophic bacterioplankton in a meromictic salt lake

Article Abstract:

The purple sulfur bacterium, Amoebobacter purpureus, is the main source of phosphorous for the chemoheterotrophic bacterioplankton development in the mixolimnion of the meromictic Mahoney salt lake, Canada. The amount of chlorophyll a and the primary production of the phytoplankton is unrelated to the growth rates of bacteria. Inorganic phosphorous or nitrogen controls the bacterial growth rates, but the appearance of the sulfur bacteria cells increases the biomass of the heterotrophic bacteria.

Research, Canada, Influence, Sulfur bacteria, Phosphorus, Phosphorus (Chemical element), Phytoplankton

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Microbiology of a nitrite-oxidizing bioreactor

Article Abstract:

A nitrite-oxidizing sequence batch reactor was utilized in investigating the identity of the nitrite oxidizers which are present in wastewater treatment plants. The batch reactor was fed with an inorganic salts solution and nitrite which served as the sole energy source. Different gram negative and gram positive bacteria were identified in nitrite-oxidizing sequence batch reactor sewage, suggesting the existence of various microbial community in any wastewater treatment systems.

Gram-negative bacteria, Sewage, Sewage microbiology, Nitrites, Nitrification

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Isolation of aerobic anoxygenic photosynthetic bacteria from black smoker plume waters of the Juan de Fuca Ridge in the Pacific Ocean

Article Abstract:

Research performed on a strain of aerobic anoxygenic photosynthetic bacteria reveal the presence of bacteriochlorophyll a (Bchl). The abundance of the the bacteria despite isolation from a deep-ocean hydrothermal vent plume environment indicates that the ability to produce Bchl is of selective advantage. Further studies have to be done to differentiate between the evolution of photosynthesis at deep hydrothermal vents and that in sun-irradiated environments.

Bacteria, Aerobic, Aerobic bacteria, Hydrothermal vents, Bacteria, Photosynthetic, Photosynthetic bacteria, Ultrastructure (Biology)

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