kerosene is the colorless liquid and slightly heavier than gasoline thatspecific odor removes after evaporation. soil and underground water source arecontaminated with different pollutants such as petroleum hydrocarbons. these pollutantshave various negative environmental effects on soil and surrounding environment. theaim of this research is to understand the effect of kerosene pollution on tw...

We measured the vertical and seasonal distribution of picoplankton (0.2-2 microm) and nanoplankton (2-20 microm) in the photic layer of Cuban southern oceanic and coastal waters. The concentration of the different fractions was estimated by epifluorescence microscopy. Heterotrophic components from the different fractions showed higher vertical stratification in the oceanic station in comparison...

The impact of storm conditions on the heterotrophic activity of planktonic bacteria in a southwestern reservoir was investigated. Storm events were considered as rainfall in excess of 2.5 cm in a 24-h period before sampling. Storm conditions stimulated heterotrophic activities and resulted in increased uptake rates and decreased turnover times of glutamate and acetate. Uptake rates were 45 to 7...

Inactivation and microbial regrowth of penicillin-, ampicillin-, cefalexin-, tetracycline-, chloramphenicol-, and rifampicin-resistant bacteria were studied to explore risks associated with selection and regrowth of antibiotic-resistant bacteria after PAA disinfection. The results showed that after exposure to 20 mg/L PAA for 10 min, inactivation of ampicillin-resistant bacteria reached 2.3-log...

Microcystins are secondary metabolites produced by several freshwater, bloom-forming cyanobacterial species. Microcystin-producing cyanobacteria co-occur with a complex community of heterotrophic bacteria. Though conflicting, studies suggest that microcystins affect the physiology of heterotrophic bacteria by inducing oxidative stress and increasing cell envelope permeability. Based on these ob...

The most common used methods for water disinfection were chemicals like chlorine, ozonation, ultraviolet radiation, membrane processes, etc. Water disinfection using irradiation techniques is new in water treatment industry which has been developed recently. The aim of the present study was to investigate radio frequency (RF) efficiency for the inactivation of total coliform (TC), fecal colifor...