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Parasite-host interactions has been a research topic of extreme importance due to its implications on human health, agriculture, and wildlife. Since the virus-bacteria interactions are the most abundant in nature, they had become in the object of intensive study. Specifically, how virus infection mechanisms have evolve is still an open question. Classic parasite theory argues that nature selects the...
Bacteriophages - viruses that infect and replicate inside bacteria - undergo rapid degradation outside their hosts. Thus, a common expectation is that phages will minimize environmental exposure by maximizing their adsorption rate, i.e., infection rate. Here we show that, while maximized adsorption is a good strategy when bacterial host cells are healthy, situations exist where bypassing hosts may...
Bacteriophages are ideal recognition elements for bacterium because of specificity and high affinity in the field of biosensors. The effect of bimolecular immobilization directly influences the performance of biosensors, so orientation immobilization of bacteriophages is of great importance to the biosensors. This article reviews the recent progress in biosensors that used a variety of strategies...
The persistent poor access to safe drinking water in low-income regions necessitates the development of low-cost alternatives to available yet expensive water treatment technologies. To address this need, this research investigates the development of a biofilter using the seeds of Moringa oleifera (MO), an indigenous tree in many low-income countries. The protein extracts from the MO seeds have been...
The Batch equilibrium experiments were used to reveal streptomycin adsorption on three kinds of soils in Inner Mongolia pastoral, China. The effects of pH, soil organic content and microorganisms on adsorption were investigated. The results obtained were well-described by the Freundlich and Langmuir model, while fitted the linear model successfully. Different adsorption behaviors of streptomycin were...
The biosorption of reactive red on acid-treated Penicilium sp. was investigated in a packed-bed column. The column experiments were conducted to study the effect of operating parameters such as initial dye concentration, adsorbent dose and flow rate on the column removal capacity. The Thomas model was used to analyze the experimental data. Column experiments showed that the fungal mycelia mixed with...
Bio-sorption of Pb2+ ion from wastewater with Chlorella was investigated in the batch mode. The influence of pH of the solution, biosorbents dose, concentration of ions and contact time on bio-sorption capacity of Pb2+ ions was studied. The studies revealed that Pb2+ ions uptake rate was rather slow, with 75% of the total amount occurring in the first 10min for Chlorella. The optimum pH for bio-sorption...
The extraction of extracellular polymeric substances (EPS) from activated sludge and the absorption properties of chromium (VI) (Cr6+) on EPS were examined in this experiment. The effects of adsorption time, pH, mass of EPS, and initial Cr6+ concentration on Cr6+ removal efficiency were investigated. The results indicated that high speed centrifugation was efficient in the extraction of EPS and caused...
The present study was undertaken to evaluate the feasibility of Pseudomonas alcaligenes biomass for the removal of strontium ions from aqueous solutions. Batch experiments were performed to study the adsorption of strontium on pH, Pseudomonas alcaligenes biomass adsorbent with respect to initial Sr(II) concentration, contact time and biomass dose. The experimental data were modeled by Langmuir and...
Glyphosate is the herbicide widely used in China. However, little is known on the processes governing the environmental fate of glyphosate in soils and its environmental risk for groundwater. Laboratory experiments were performed to evaluate the degradation, adsorption, and leaching behavior of glyphosate in three agricultural soils with high sand content and different soil organic carbon content...
The metal uptake capacity of a bacterial strain (namely W-6) isolated from both activated sludge and heavy metals contaminated soil adjacent to an electroplating plant was investigated. Being acclimated by high metal concentration solution, the biosorption rate and zinc tolerance of W-6 were significantly improved. The optimal parameters for W-6 were pH at 6.0, temperature at 40°C, 8 hours' sorption...
The research chose the alginate sodium and PVA as the materials to immobilize the atrazine degrading bacteria. Four methods were adopted: alginate sodium adsorption method, alginate sodium embedding method, PVA boric cross linking method and PVA freezing method. The degrading effects and the characteristics of the atrazine degrading bacteria in the two materials were studied respectively. The result...
Methyl tert-butyl ether (MTBE) is a common additive for producing a clean burning fuel with a higher Octane number and less emissions. Batch adsorptive capacity, continuous flow breakthrough and biological activated carbon (BAC) treatment experiments were conducted to compare the adsorptive capacities of four activated carbons for MTBE, to obtain the adsorptive capacity indicators useful for predicting...
Zeolit/Ag+ composite particles material (ZACPM) had been prepared using zeolite as carrier by carrying Ag+, solidifying Ag+ stably in the holes of zeolite and enhancing the adsorption property of zeolite. The effects of technological parameters on preparation of ZACPM, the air purification properties such as antibacterial property and the function of eliminating harmful gases and the microstructure...
Immobilized microorganism technology is an effective method of removing water pollutant in source waters. The effect of biologically immobilized ceramic particles is better in removing the pollutant than simple filter or engineering bacteria liquid, due to the two factors including the adsorption and entrapment function of the filter materials in the biofilter and the biodegradation of the microorganisms...
In the present study we reported the feasibility of extracellular biopolymer (PF-9) produced by Pseudomonas fluorescence C-9 as an alternative biosorbent to remove Pb(II) metallic ions from environmental and industrial wastewater.The ability of PF-9 to remove the metallic ions was investigated by using batch biosorption procedure. The effects such as, pH, biosorbent dosage, sorbate concentrations...
The performance and enhancement of pollutants removal in raw municipal sewage by a new pretreatment process were investigated in this study. The experiments were carried out with a GS sedimentation tank in full scale plant. The results revealed that average removal efficiency of TP, TSS, and TN achieved 49%, 67.3% and 20% respectively during stable running period. TSS removal rate could achieve about...
Denitrification is one of the main objectives of water pollution control. By using heterotrophic nitrification- aerobic denitrifying bacterial strains H1 to deal with domestic sewage, the removal rate of TN and NH4+-N can reach 66.04% and 62.11% respectively. In order to achieve solid-liquid separation and recycling of strains, H1 immobilized by polyvinyl alcohol- sodium alginate, Fe3O4 nanoparticles,...
The biosorption of strontium ions on beer yeast was investigated under the different adsorption conditions. The results of this study showed that the beer yeast has some abilities to adsorb Sr(II) from solution. Different variables, such as solution pH, contact time, adsorbent dose and initial strontium ions concentration influenced the adsorptive quantity. The process of biosorption has nearly reached...
Ammonium adsorption characteristics of the denitrifying filter and the biologically aerated filter backwashed sludge and influence factors such as sludge concentration, sludge activity and effect of chemical coagulants were investigated. Ammonium was found to be adsorbed to both kinds of backwashed sludge. The backwashed sludge in biologically aerated filter adsorbed more ammonium than that in denitrifying...
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