Opportunistic pathogens and faecal indicators in drinking water associated biofilms in Cluj, Romania

Farkas, Anca; Drăgan-Bularda, M.; Ciatarâş, Dorin; Bocoş, B.; Ţigan, Ştefan

doi:10.2166/wh.2012.148

Cited by 23 publications

(12 citation statements)

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“…Aeromonads have been co-isolated with one or more representatives of other genera from natural freshwater and seawater biofilms (Stine et al, 2003; September et al, 2007; Balasubramanian et al, 2012; Farkas et al, 2012; Marti et al, 2014). Aeromonas spp.…”

Section: Biofilm Formation In Aeromonasmentioning

confidence: 99%

The Social Life of Aeromonas through Biofilm and Quorum Sensing Systems

2017

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Bacteria of the genus Aeromonas display multicellular behaviors herein referred to as “social life”. Since the 1990s, interest has grown in cell-to-cell communication through quorum sensing signals and biofilm formation. As they are interconnected, these two self-organizing systems deserve to be considered together for a fresh perspective on the natural history and lifestyles of aeromonads. In this review, we focus on the multicellular behaviors of Aeromonas, i.e., its social life. First, we review and discuss the available knowledge at the molecular and cellular levels for biofilm and quorum sensing. We then discuss the complex, subtle, and nested interconnections between the two systems. Finally, we focus on the aeromonad multicellular coordinated behaviors involved in heterotrophy and virulence that represent technological opportunities and applied research challenges.

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Section: Biofilm Formation In Aeromonasmentioning

confidence: 99%

The Social Life of Aeromonas through Biofilm and Quorum Sensing Systems

2017

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“…Water is a very important resource needed to sustain life, and safe drinking water is a fundamental requirement for human life [1]. The availability of safe drinking water represents a global challenge, and authorities sustain substantial efforts in two priority areas: water quantity and water quality assurance [2]. The deterioration of water quality primarily involves microbiological hazards, since the majority of evident water-related health problems are the result of microbial contamination [2].…”

Section: Introductionmentioning

confidence: 99%

Microbiological Quality of Drinking Water from Water Dispenser Machines

Moosa¹,

Khan²,

ALAlami³

et al. 2015

IJESD

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The aim of this study was to investigate the microbial quality of drinking water distributed through water dispenser machines located in schools and universities in Ajman, UAE. In total, 49 drinking water samples were collected from water dispenser machines in the schools and university's premises in the emirate of Ajman. Total coliform and E.coli were detected using Colilert test. P. aeruginosa colonies were counted on Pseudomonas agar using the membrane filtration method. Overall, 25 out of total 49 samples were found to contain either P. aeruginosa, or total coliform or both. Six samples were found positive for total coliform group members, whereas nineteen of the samples were positive for P. aeruginosa. Ten water samples were found positive for both total coliform and P.aeruginosa. P.aeruginosa colonies count ranged between 4 to 51 colonies per 250 ml of water sample. In conclusion, overall microbiological quality of 25 drinking water samples distributed through the water dispenser machine was found unsatisfactory, and this could be attributed to the poor maintenance and improper hygienic conditions of water dispenser machines. In order to safeguard public health, more efforts such as community awareness program, strict regulations such as regular inspections by the local municipalities are needed.Index Terms-Microbiological quality, drinking water, water dispenser.

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“…and Aeromonas spp. were found to survive and multiply in biofilms in the DWTP of Cluj [39]. Their metabolic versatility [40] may explain the high numbers of culturable bacteria obtained in the present study, based on the ability to grow on a range of different substrates.…”

Section: Significance Of the Bacterial Species Identified In Each Ecomentioning

confidence: 82%

Microbial activity in drinking water-associated biofilms

Farkas¹,

Drăgan-Bularda

Muntean

et al. 2013

Open Life Sciences

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Microbial activity in drinking water-associated biofilmsAbbreviations DWTP -drinking water treatment plant; SRB -sulphate reducing bacteria; MPN -most probable number; TOC -total organic carbon. IntroductionDrinking water quality is dependent on the specific composition and activity of microbial populations present during water treatment, storage and distribution [1]. As in most aquatic environments, biofilms are the predominant mode of microbial growth in drinking water networks [2].Flemming et al. [3] estimated that approximately 95% of bacterial cells are attached to pipe walls, as biofilm communities, while less than 5% are found in the water phase. Bacterial adhesion and biofilm formation at the inner surfaces of water systems, from source abstraction to the consumers tap, represent a complex challenge to water professionals. Biofilms may play a beneficial role in drinking water treatment, as biological filters [4][5][6]. On the other hand, detrimental effects known as biofouling may occur, including microbially induced corrosion, disinfectant depletion, aesthetic problems i.e. colour, odour and taste degradation and microbiological deterioration of drinking water [7]. The complex structure of biofilms associated with drinking water processing and distribution is generally However, detrimental effects such as biofouling (i.e., biocorrosion and water quality deterioration) may also occur. In this study microbiological processes and factors influencing the activity of bacteria in biofilms were investigated by conventional cultivation methods. The presence of bacteria belonging to different ecophysiological groups was assessed during drinking water treatment, in biofilms developed on concrete, steel and sand surfaces. Influences of the treatment process, type of immersed material and physico-chemical characteristics of raw/bulk water and biofilms upon the dynamics of bacterial communities were evaluated. Results revealed intense microbial activity in biofilms occurring in the drinking water treatment plant of Cluj. Ammonification, iron reduction and manganese oxidation were found to be the predominant processes. Multiple significant correlations were established between the evolution of biofilm bacteria and the physico-chemical parameters of raw/ bulk water. The type of immersed material proved to have no significant influence upon the evolution of microbial communities, butthetreatmentstage,suggestingthattheprocessesappliedrestrictmicrobialgrowthnotonlyinbulkfluidbutinbiofilms,too.©VersitaSp.zo.o.Brought to you by | MIT Libraries Authenticated Download Date | 5/11/18 1:28 PM

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Opportunistic pathogens and faecal indicators in drinking water associated biofilms in Cluj, Romania

Cited by 23 publications

References 0 publications

The Social Life of Aeromonas through Biofilm and Quorum Sensing Systems

The Social Life of Aeromonas through Biofilm and Quorum Sensing Systems

Microbiological Quality of Drinking Water from Water Dispenser Machines

Microbial activity in drinking water-associated biofilms

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