Investigation of the diversity of nirK and nirS in denitrifying bacteria revealed that salinity decreased the diversity in a nitrate-containing saline wastewater treatment system. The predominant nirS clone was related to nirS derived from marine bacteria, and the predominant nirK clone was related to nirK of the genus ALCALIGENES:

Denitrification is a distinct means of energy conservation, making use of N oxides as terminal electron acceptors for cellular bioenergetics under anaerobic, microaerophilic, and occasionally aerobic conditions. The process is an essential branch of the global N cycle, reversing dinitrogen fixation, and is associated with chemolithotrophic, phototrophic, diazotrophic, or organotrophic metabolis...

Significant quantities of pharmaceutical substances enter biological wastewater treatment plants, where they interact with activated sludge microorganisms. An example a commonly used is the non-steroidal anti-inflammatory drug diclofenac (DCF). The presence high concentrations DCF in can disrupt nutrient removal processes, which are highly sensitive to external environmental factors. This paper...

Denitrifying phosphorus removal (DPR) by denitrifying phosphorus-accumulating organisms (DPAOs) is a promising approach for reducing energy and carbon usage. However, influent fluctuations or interruptions frequently expose the DPAOs biomass to starvation conditions, reducing biomass activity and amount, and ultimately degrading the performance of DPR. Therefore, a better understanding of the e...

Profundal sediments of Lake Constance were sampled at 60 130 m water depth and studied with respect to the population sizes and depth distribution of mixotrophic and lithotrophic iron oxidizing, denitrifying bacteria. The sediment cores showed a distinct stratification with oxygen and nitrate being consumed within the first centimeter of the sediment. The sediment contained large amounts of aci...

Anaerobic culture is especially indicated when an exudate has a foul odor or if the. In open wounds, anaerobic organisms may play an etiologic role, whereas . Anaerobic infections are caused by anaerobic bacteria. Obligately anaerobic bacteria do not. . Polymicrobial postoperative wound infections can occur. Bacteria that cannot grow in the presence of oxygen (anaerobic) usually are found in de...

Microbially induced carbonate precipitation (MICP), an emerging technology for soil improvement, also may be used to sequester (biomineralize) radionuclides and metal contaminants (e.g., 90 Sr 2+ , Cd 2+ ) in groundwater, a significant problem at some U.S. Department of Energy sites. Previous work using the bacterium Bacillus pasteurii suggests that in-situ sequestration of these contaminants c...

In order to find an environmentally benign substitute to hazardous inhibitory agents, the inhibitory effect of gamma-irradiated chitosans against a mixed culture of denitrifying bacteria was experimentally evaluated. Unlike other studies using pure aerobic cultures, the observed effect was not a complete inhibition but a transient inhibition reflected by prolonged lag phases and reduced growth ...