Comparative study of E. coli survival in two aquatic ecosystems

1976 ◽  
Vol 10 (2) ◽  
pp. 129-136 ◽  
Author(s):  
W Verstraete
Keyword(s):  
Comparative Study ◽  
Aquatic Ecosystems ◽  
E Coli

scholarly journals Comparative Study of Ag Nanostructures: Molecular Simulations, Electrochemical Behavior, and Antibacterial Effect

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Álvaro de Jesús Ruíz-Baltazar ◽  
Simón Yobanny Reyes-López ◽  
D. Larrañaga ◽  
R. Pérez
Keyword(s):  
Cyclic Voltammetry ◽  
Ethylene Glycol ◽  
Comparative Study ◽  
Sodium Borohydride ◽  
Electrochemical Behavior ◽  
Antibacterial Effect ◽  
Chemical Reduction ◽  
Molecular Simulations ◽  
The Other ◽  
E Coli

Nanoparticles of Ag with different sizes and structures were obtained and studied. Two methods for reductions of Ag ions were employed, chemical reduction by sodium borohydride and ethylene glycol. Cuboctahedral and icosahedral structures were obtained. Molecular simulations were carried out in order to evaluate the reactivity of both structures. On the other hand, the electrochemical activity and antibacterial effect (E. coli) of the cuboctahedral and icosahedral structures were measured experimentally. The results obtained by molecular simulation, cyclic voltammetry, and antibacterial effect were compared and discussed in this work.

Illite for the removal of E. coli by filtration in water treatment processes: a comparative study

2019 ◽  
Vol 163 ◽  
pp. 270-280
Author(s):  
Mun-Ju Kim ◽  
Chang-Gu Lee ◽  
Chang-Hee Lee ◽  
Seong-Jik Park
Keyword(s):  
Water Treatment ◽  
Comparative Study ◽  
E Coli ◽  
Treatment Processes

scholarly journals Occurrence of Virulence Genes Associated with Diarrheagenic Pathotypes in Escherichia coli Isolates from Surface Water

2012 ◽  
Vol 79 (1) ◽  
pp. 328-335 ◽  
Author(s):  
Jatinder P. S. Sidhu ◽  
Warish Ahmed ◽  
Leonie Hodgers ◽  
Simon Toze
Keyword(s):  
Escherichia Coli ◽  
Health Risks ◽  
High Frequency ◽  
Aquatic Ecosystems ◽  
Virulence Genes ◽  
Storm Water ◽  
Storm Events ◽  
Widespread Occurrence ◽  
Content Type ◽  
E Coli

ABSTRACTEscherichia coliisolates (n= 300) collected from six sites in subtropical Brisbane, Australia, prior to and after storm events were tested for the presence of 11 virulence genes (VGs) specific to diarrheagenic pathotypes. The presence ofeaeA,stx1,stx2, andehxAgenes specific for the enterohemorrhagicE. coli(EHEC) pathotype was detected in 56%, 6%, 10%, and 13% of isolates, respectively. The VGsastA(69%) andaggR(29%), carried by enteroaggregative (EAEC) pathotypes, were frequently detected inE. coliisolates. The enteropathogenicE. coli(EPEC) genebfpwas detected in 24% of isolates. In addition, enteroinvasiveE. coli(EIEC) VGipaHwas also detected in 14% of isolates. During dry periods, isolates belonging to the EAEC pathotype were most commonly detected (23%), followed by EHEC (11%) and EPEC (11%). Conversely, a more uniform prevalence of pathotypes, EPEC (14%), EAEC (12%), EIEC (10%), EHEC (7%), and ETEC (7%), was observed after the storm events. The results of this study highlight the widespread occurrence of potentially diarrheagenic pathotypes in the urban aquatic ecosystems. While the presence of VGs inE. coliisolates alone is insufficient to determine pathogenicity, the presence of diarrheagenicE. colipathotypes in high frequency after the storm events could lead to increased health risks if untreated storm water were to be used for nonpotable purposes and recreational activities.

Comparative Study of AFM and FESEM for Imaging the Single Cell of Escherichia Coli Bacteria

2015 ◽  
Vol 34 ◽  
pp. 61-66
Author(s):  
Kamarulazizi Ibrahim ◽  
Mohammad Hafiz Khalid ◽  
Mohamed Hassan Eisa ◽  
Mohd Nazalan Najimudin ◽  
Mohammad A. Al Rajhi ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Comparative Study ◽  
Single Cell ◽  
Food Poisoning ◽  
Rapid Identification ◽  
Force Microscopy ◽  
E Coli ◽  
Atomic Force ◽  
Identification Of Bacteria ◽  
Escherichia Coli Bacteria

In this work, a comparative study using atomic force microscopy (AFM) and field emission–scanning electron microscopy (FESEM) has been carried out to assess the morphology of single cellEscherichia colibacteria (E-coli).E-colibacteria are a major concern for public health. Attention was focused on the certain strains ofE-colibacteria, because some strains can be toxic and cause food poisoning. TheE-colibacteria have attracted much research interest because this bacterium is easily to get, cheap and rapid reproductively. Imaging ofE-colirecently, was improved by using high resolution microscopy. Current techniques for detection such as, AFM and FESEM has attracted great interest and emerging as a potentially powerful whole-organism fingerprinting tool for the rapid identification of bacteria. The obtained results of AFM and FESEM techniques have been compared to show the image quality of single cellE-coli.

scholarly journals Threats to aquatic ecosystems caused by antibiotic-resistant isolate of Escherichia coli from sewage

2016 ◽  
Vol 48 (4) ◽  
pp. 341-351
Author(s):  
Magdalena Frąk ◽  
Zuzanna Kozerska
Keyword(s):  
Escherichia Coli ◽  
Aquatic Environment ◽  
Aquatic Ecosystems ◽  
Resistant Isolate ◽  
Antibiotic Resistant ◽  
E Coli ◽  
Low Concentrations ◽  
Resistance To Penicillin

Abstract The occurrence of Escherichia coli isolate resistant to penicillin and streptomycin in sewage discharged into the environment was tested. Thirty three Escherichia coli isolate were isolated from sewage samples showed different susceptibility to tested antibiotics. All tested isolate show higher resistance to penicillin than streptomycin. Twenty four tested E. coli isolate showed resistance only to low concentrations of penicillin. Five E. coli isolate showed resistance to higher concentrations of penicillin as well (120 μg·dm−3). Five E. coli isolate showed resistance to penicillin and streptomycin. Discharging sewage that contains bacteria isolate resistant to antibiotics into the aquatic environment causes their spreading and increases threats to aquatic ecosystems.

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