Lauryl sulphate broth, introduced by Cowles (1938) and modified by Mallman and Darby (1941), has been widely used in recent years for the presumptive test for coliform bacteria in water. Lauryl sulphate is, to a certain extent, an inhibitory agent and tends to suppress anaerobic lactose fermenting bacteria. Inhibitory agents in culture media are always subject to suspicion. A substance which ca...

Introduction: Analyzing the health risk associated with the microbial contamination of seawater is necessary to ensure that there is not any threat to human or environment. The aim of this study was to evaluate the microbiological quality of Caspian sea water using indicator bacteria. Some Physicochemical parameters were studied to assed their association with the contamination level of Caspian...

Soil treatment of wastewater has the potential to achieve high purification efficiency, yet the understanding and predictability of purification with respect to removal of viruses and other pathogens is limited. Research has been completed to quantify the removal of virus and bacteria through the use of microbial surrogates and conservative tracers during controlled experiments with three-dimen...

The fecal coliform populations found in the raw sewages and final sewage effluents of mechanical treatment plants, a long-term retention lagoon, shorter-term retention lagoons, a remote northern Canada river, and a heavily urbanized prairie river were examined for antibiotic resistance and the possession of R factors. It was determined that there was a decrease in the percentage of multiresista...

introduction: one of the methods for disposal of sludge is its usage as fertilizer on agricultural. the purpose of this study was to analyze the possibility in the application of sludge to agricultural, according to environmental standards. methods: this descriptive-analytic study was conducted for 12 months on dried sludge wastewater treatment plant in yazd. monthly sampling and tests were per...

Fecal contamination of bedding has been associated with coliform mastitis caused by E. coli, while coliform mastitis caused by Klebsiella spp. is associated with wet sawdust and wood shavings.(1) Coliform mastitis has an average incidence rate of 15% to 20% in herds with low somatic cell counts (SCC) and is implicated in 30% to 40% of clinical cases. It is a common cause of fatal mastitis in ca...

Pasture runoff can contribute to elevated concentrations of nutrients, solids, and bacteria in downstream waters. The objective of this study was to determine the effects of vegetative filter strip (VFS) length on concentrations and transport of nitrogen, phosphorus, solids and fecal coliform in runoff from plots treated with cattle manure. Three plots with dimensions of 2.4 × 30.5 m were used....