The reduction of sulfate to sulfide was seldom considered for high-salt wastewater treatment, although could supply electron donors remove nitrite. reduction, heterotrophic denitrification and autotrophic were integrated in one biofilm-enhanced treatment system the used as an intermediate reaction. Both reactor performances spatial distribution bacterial communities studied. metabolic pathways ...

BACKGROUND The loss of photosynthesis has occurred often in eukaryotic evolution, even more than its acquisition, which occurred at least nine times independently and which generated the evolution of the supergroups Archaeplastida, Rhizaria, Chromalveolata and Excavata. This secondary loss of autotrophic capability is essential to explain the evolution of eukaryotes and the high diversity of pr...

The objective of this study was to evaluate the quality of water purification system and identify the bacteria this system, predict bacterial adherence according to the hydrophobicity of these microorganisms and of the polypropylene distribution loop for purified water. The assessment of drinking water that supplies the purification system allowed good-quality physical, chemical, and microbiolo...

The mechanisms by which microbes interact in communities remain poorly understood. Here, we interrogated specific interactions between photoautotrophic and heterotrophic members of a model consortium to infer mechanisms that mediate metabolic coupling and acclimation to partnership. This binary consortium was composed of a cyanobacterium, Thermosynechococcus elongatus BP-1, which supported grow...

The distribution of obligate oligotrophs in the South China Sea and the West Pacific Ocean was investigated by the I4C-MPN method with a medium containing 0.2 mg organic carbon I-'. In surface waters at all stations except Singapore harbour, the total number of heterotrophic bacteria ranged from 1.3 X 10' to 2 . 5 ~ 103 cells ml-l, and 45 to 98% of the total heterotrophs were obligate oligotrop...

Many heterotrophic bacteria are known to release extracellular vesicles, facilitating interactions between cells and their environment from a distance. Vesicle production has not been described in photoautotrophs, however, and the prevalence and characteristics of vesicles in natural ecosystems is unknown. Here, we report that cultures of Prochlorococcus, a numerically dominant marine cyanobact...

An artificial pyritic coal spoil was prepared and examined over a period of 1.5 years for changes in the population of various physiological varieties of bacteria and also for mineral leaching. Heterotrophic bacteria were the first to dominate the spoil, acquiring a population of 10(7) cells per g within 2 weeks. Bacteria capable of utilizing choline sulfate as the sole source of energy compris...

Seeds of the plant species Strychnos potatorum and Moringa oleifera contain natural polyelectrolytes which can be used as coagulants to clarify turbid waters. In laboratory tests, direct filtration of a turbid surface water (turbidity 15-25 NTU, heterotrophic bacteria 280-500 cfu ml(-1), and fecal coliforms 280-500 MPN 100 ml(-1)), with seeds of S. potatorum or M. oleifera as coagulant, produce...

Water is used for various human activities such as drinking, bathing, washing and recreation. The physicochemical as well as microbiological qualities of water samples collected over a period of ten months from five swimming pools in five randomly-selected hotels in Osogbo metropolis, Southwestern Nigeria were assessed. The collection of the fifty water samples spanned the dry and rainy seasons...

Methylotrophs, which can utilize methane and/or methanol as sole carbon and energy sources, are key players in the carbon cycle between methane and CO₂, the two most important greenhouse gases. This review describes the relationships between methylotrophs and plants, and between methanotrophs (methane-utilizers, a subset of methylotrophs) and heterotrophic bacteria. Some plants emit methane and...