Waste Water Bacterial Isolates Resistant to Heavy Metals and Antibiotics

Filali, B. K.; Taoufik, J.; Zeroual, Youssef; Dzairi, Fatima Zohra; Talbi, Mohamed; Blaghen, Mohamed

doi:10.1007/s002840010109

Cited by 34 publications

(40 citation statements)

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“…The results indicate that these strains showed multiple resistance compared to others reported by Booth and Williams (1984) and Filali et al (2000). Strain P5-18 was found to be the most resistant strain to the metals followed by the strain P1-14.…”

Section: Minimal Inhibitory Concentration Of Bacterial Growth Inhibitorssupporting

confidence: 47%

Effect of iron and growth inhibitors on siderophores production by Pseudomonas fluorescens

Rachid¹,

Bensoltane²

2005

Afr. J. Biotechnol.

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The ability of Pseudomonas to grow and to produce siderophores is dependent on the iron content and the type of carbon sources in the medium. Under conditions of low-iron concentration the Pseudomonas isolates studied produced yellow-green fluorescent iron-binding peptide siderophores and the biosynthesis of this siderophores was affected by several different environmental parameters. Four basal media, supplemented with different concentration of iron, were employed to study the effect of iron and different organic carbon sources on siderophore production in Pseudomonas fluorescens. The highest siderophores concentration was obtained in succinate medium. Ferric iron increased the growth yield and completely repressed siderophores production above 200 g/l, but had a positive effect below 160 g/l. Penicillin and lead elicited the production of siderophores in the presence of excess iron. Pre-treatment of the standard succinate medium with α α α α,α α α α-dipyridyl and 8-hydroxyquinoline to reduce the concentration of iron diminished both the growth yield and siderophore production, but α α α α,α α α α-dipyridyl increased significantly the amount of siderophores produced in the presence of 0.20 mg/l of the chelating ion.

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Section: Minimal Inhibitory Concentration Of Bacterial Growth Inhibitorssupporting

confidence: 47%

Effect of iron and growth inhibitors on siderophores production by Pseudomonas fluorescens

Rachid¹,

Bensoltane²

2005

Afr. J. Biotechnol.

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“…As suggested by Shruti et al (2012), varying response of the tested bacteria to the heavy metal ions might be due to the difference in their cell wall composition or to variations in the resistance mechanisms. Different resistance mechanisms developed in bacteria could serve as a basis for their use in bioremediation approaches (Filali et al 2000;Malik 2004). In this regard, Vi−2 and Vi−4 strains showing high resistance to most of the tested heavy metals are especially promising.…”

Section: Discussionmentioning

confidence: 99%

“…The resis− tance to heavy metals in bacteria is usually associated with plasmids, which also encode resistance to antibiotics, although a direct correlation between antibiotic resistance and heavy metals resistance of the strains tested in this study cannot be established. Clustered resistance genes are more likely to simultaneously pass to other bacteria in the environment (Filali et al 2000;Lawrence 2000;Spain and Alm 2003). Thus, in an environment with multiple stresses, for example antibiot− ics and heavy metals, it would be more beneficial to the survival of bacteria to ac− quire resistance to both stresses.…”

Section: Discussionmentioning

confidence: 99%

Characterization of heavy metals resistant heterotrophic bacteria from soils in the Windmill Islands region, Wilkes Land, East Antarctica

Tomova¹,

Stoilova−Disheva²,

Vasileva−Tonkova³

2014

Polish Polar Research

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Abstract:In this study, selected heavy metals resistant heterotrophic bacteria isolated from soil samples at the Windmill Islands region, Wilkes Land (East Antarctica), were character− ized. Phylogenetic analysis revealed affiliation of isolates to genera Bacillus, Lysini− bacillus, Micrococcus and Stenotrophomonas. The strains were found to be psychrotolerant and halotolerant, able to tolerate up to 10% NaCl in the growth medium. The Minimum In− hibitory Concentration of the seven heavy metals Cr, Cu, Ni, Co, Cd, Zn, and Pb was deter− mined in solid media for each bacterial strain. Gram−positive Vi−2 strain and Gram−negative Vi−4 strain showed highest multiply heavy metals resistance, and Vi−3 and Vi−4 strains showed multi−antibiotic resistance to more than a half of the 13 used antibiotics. Plasmids were detected only in Gram−negative Vi−4 strain. The bacteria were able to produce differ− ent hydrolytic enzymes including industrially important proteases, xylanases, cellulases, and b−glucosidases. High heavy metals resistance of the Antarctic bacteria suggests their potential application for wastewater treatment in cold and temperate climates. Highly sensi− tive to Cd and Co ions Vi−1, Vi−5 and Vi−7 strains would be promising for developing biosensors to detect these most toxic heavy metals in environmental samples.

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“…The tolerance of soil bacteria to heavy metals has been proposed as an indicator of the potential toxicity of heavy metals to other forms of biota (Hassen et al 1998). Different resistance mechanisms that have developed in bacteria could serve as a basis for their use in bioremediation approaches (Filali et al 2000;Malik 2004). In this sense, the following multimetal-resistant strains can be selected as especially promising for application in bioremediation of sites polluted by heavy metals: 10 Pseudomonas strains (A1-1, A1-7, A1-8, A1-10, A1-12, A2-1, A2-2, A2-7, A2-13, A2-15), Janthinobacterium sp.…”

Section: Pseudomonas Fluorescens S(45) S(35) S(45) S(34) R(-) R(-) S(mentioning

confidence: 99%

“…Resistance to heavy metals in bacteria is usually associated with plasmids which also encode resistance to antibiotics, although a direct correlation between antibiotic and heavy metal resistance of the strains tested in this study cannot be established. Clustered resistance genes are more likely to simultaneously pass to other bacteria in the environment (Filali et al 2000;Lawrence 2000;Spain & Alm 2003). Thus, in an environment with multiple stresses, for example antibiotics and heavy metals, it would be more beneficial to the survival of bacteria to acquire resistance to both stresses.…”

Section: Plasmid Testingmentioning

confidence: 99%

Antimicrobial activity and resistance to heavy metals and antibiotics of heterotrophic bacteria isolated from sediment and soil samples collected from two Antarctic islands

Tomova

Stoilova−Disheva

Lazarkevich

et al. 2015

Frontiers in Life Science

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In this study, 24 Antarctic bacteria, isolated from sediment and soil samples from Deception and Galindez Islands, were characterized for their antimicrobial activity and response to 13 antibiotics and seven heavy metals. Multiple antibiotic resistance was observed for 67% of sediment isolates and 92% of soil isolates, suggesting medium anthropogenic impact in these Antarctic regions. The results revealed a varying response of the Antarctic bacteria to the tested heavy metals. All isolates showed multiple metal resistance towards two to six heavy metals, with minimum inhibitory concentrations ranging from 1.0 mM to 23.2 mM. The majority of the strains in both groups were resistant to lead, nickel, copper and zinc. Plasmids were detected in 21% of isolates. A consortium of highly metal-resistant bacteria could be developed with potential application for biological treatment of wastewaters. Strains that are highly sensitive to cadmium would be promising for developing biosensors to detect this highly toxic heavy metal in environmental samples. All Antarctic bacteria were found to inhibit the growth of one to all eight of the tested indicator bacteria, and 87% inhibited the growth of one to all four of the yeast indicator cultures. Promising psychrotolerant strains were detected as a valuable source of new antimicrobial compounds.

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Waste Water Bacterial Isolates Resistant to Heavy Metals and Antibiotics

Cited by 34 publications

References 0 publications

Effect of iron and growth inhibitors on siderophores production by Pseudomonas fluorescens

Effect of iron and growth inhibitors on siderophores production by Pseudomonas fluorescens

Characterization of heavy metals resistant heterotrophic bacteria from soils in the Windmill Islands region, Wilkes Land, East Antarctica

Antimicrobial activity and resistance to heavy metals and antibiotics of heterotrophic bacteria isolated from sediment and soil samples collected from two Antarctic islands

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