scholarly journals Assessment of chlorine resistant bacteria and their susceptibility to antibiotic from water distribution system in Duhok province

2014 ◽  
Keyword(s):  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Resistant Bacteria

Occurrence of cop-like copper resistance genes among bacteria isolated from a water distribution system

1995 ◽  
Vol 41 (7) ◽  
pp. 642-646 ◽  
Author(s):  
Chuzhao Lin ◽  
Betty H. Olson
Keyword(s):  
Pseudomonas Syringae ◽  
Resistance Genes ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Culture Media ◽  
Copper Resistance ◽  
Copper Tolerance ◽  
Resistant Bacteria ◽  
Copper Resistance Genes

The occurrence of cop-like copper resistance determinants homologous to the cop genes of Pseudomonas syringae among bacteria isolated from a water distribution system experiencing copper corrosion was investigated in this study. It was found that at least 49% of the copper-resistant bacteria and less than 15% of the copper-sensitive isolates possessed a cop homolog. The occurrence of this determinant in the copper-resistant population correlated with the degree of copper tolerance exhibited by the bacteria. The effect of organic substances present in the culture media on the empirical degree of bacterial copper tolerance is also discussed.Key words: copper resistance genes, water distribution system, cop.

scholarly journals Spatiotemporal Changes of Antibiotic Resistance and Bacterial Communities in Drinking Water Distribution System in Wrocław, Poland

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2601
Author(s):  
Agata Siedlecka ◽  
Mirela Wolf-Baca ◽  
Katarzyna Piekarska
Keyword(s):  
Drinking Water ◽  
Antibiotic Resistance ◽  
Water Treatment ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Tap Water ◽  
Resistant Bacteria ◽  
Drinking Water Distribution System ◽  
Drinking Water Distribution

Antibiotic resistance of bacteria is an emerging problem in drinking water treatment. This paper presents the comparison of antibiotic resistant bacteria (ARB) and antibiotic resistance genes (ARGs) prevalence during the summer and winter season in a full-scale drinking water distribution system (DWDS) supplied by two water treatment plants (WTPs). The effect of distance from WTP and physical–chemical water parameters on its microbial properties was also tested. Bacterial consortia dwelling in bulk tap water were additionally compared by means of denaturating gradient gel electrophoresis (DGGE). The results showed that among ARB, bacteria resistant to ceftazidime (CAZ) were the most abundant, followed by bacteria resistant to amoxicillin (AML), ciprofloxacin (CIP), and tetracycline (TE). Numerous ARGs were detected in tested tap water samples. Only CAZ resistant bacteria were more prevalent in the season of increased antibiotic consumption, and only AML resistant bacteria relative abundances increase was statistically significant with the distance from a WTP. The investigated tap water meets all legal requirements. It is therefore safe to drink according to the law. Nevertheless, because antibiotic resistance could pose a threat to consumer health, it should be further monitored in DWDSs.

Assessment of Lisbon drinking water distribution network biofilm colonization and associated hazards

2008 ◽  
Vol 8 (4) ◽  
pp. 421-426
Author(s):  
J. Menaia ◽  
M. Benoliel ◽  
A. Lopes ◽  
C. Neto ◽  
E. Ferreira ◽  
...  
Keyword(s):  
Drinking Water ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Water Distribution Network ◽  
Storage Tanks ◽  
Water Pipe ◽  
Cultural Methods ◽  
Drinking Water Distribution ◽  
And Storage

Concerns arise from the possible occurrence of pathogens in drinking water pipe biofilms and storage tank sediments. In these studies, biofilm samples from pipes and sediments from storage tanks of the Lisbon drinking water distribution system were analyzed. Protein determinations and heterotrophic counts on pipe biofilm samples were used to assess the Lisbon network sessile colonization intensity and distribution. Indicator and pathogenic microorganisms were analyzed in pipe biofilm samples, as well as in storage tanks biofilm and sediments, by using cultural methods and PCR, to assess risks. Results have shown that the Lisbon network sessile colonization is relatively weak in intensity. In addition, no meaningful hazards were apparent for both the network biofilm and the storage tanks biofilm and sediments.

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