Reduction of chromium-VI by chromium-resistant Escherichia coli FACU: a prospective bacterium for bioremediation

Mohamed, Mahmoud S M; Elarabi, Nagwa I.; El-Hussein, Ahmed; El-Maaty, Shereen Abu; Abdelhadi, Abdelhadi A.

doi:10.1007/s12223-020-00771-y

Cited by 46 publications

(17 citation statements)

References 42 publications

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“…A previous study proved that the effect of phages belongs to adsorption sites on the surface of bacteriophage T4. These sites are found to be negatively charged through the zeta potential analysis and thus, demonstrating the capabilities of these viruses at adsorbing positively charged metal cations, Studies have also shown that microbes can be responsible for both the mobilization and immobilization of heavy metals in the subsurface, which influences the storage and release of these metals in the environment that these microbes are present in (Oyewo et al, 2018;Mohamed et al, 2020). This demonstrates the potential of viruses which are much more abundant than bacteria, to be a potential player in contaminant mobility in subsurface environments.…”

Section: Discussionmentioning

confidence: 94%

Improving Wastewater Treatment Using Dried Banana Leaves and Bacteriophage Cocktail

et al. 2019

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Section: Discussionmentioning

confidence: 94%

Improving Wastewater Treatment Using Dried Banana Leaves and Bacteriophage Cocktail

et al. 2019

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“…Among the gram positive bacteria, Bacillus, Deinococcus, and Arthrobacter have shown Cr (VI) reduction capability [107,150,151]. Meanwhile, Enterococcus, Shewanella, Pseudomonas, Escherichia, Thermus, and Ochrobactrum are examples of gram-negative bacteria with potential application in bioremediation [152][153][154][155][156][157]. Microbial reduction is one of the most promising routes for in situ reclamation of Cr (VI) polluted groundwater [22,158].…”

Section: Bioreductionmentioning

confidence: 99%

“…The nitroreductases NfsA, a common enzyme in the genera Bacillus, possesses Cr (VI) reductase activity as a secondary function and belongs to class II [166]. This enzyme mediates one-electron reduction processes forming the Cr (V) intermediate, leading to high reactive oxygen species generation [152]. This secondary function is possibly the result of bacterial enzymatic adaptation to the relatively recent increase of Cr (VI) content in the environment caused by anthropogenic activities [165].…”

Section: Bioreductionmentioning

confidence: 99%

Chromium Pollution in European Water, Sources, Health Risk, and Remediation Strategies: An Overview

Tumolo

Ancona

Paola

et al. 2020

IJERPH

280

101

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Chromium is a potentially toxic metal occurring in water and groundwater as a result of natural and anthropogenic sources. Microbial interaction with mafic and ultramafic rocks together with geogenic processes release Cr (VI) in natural environment by chromite oxidation. Moreover, Cr (VI) pollution is largely related to several Cr (VI) industrial applications in the field of energy production, manufacturing of metals and chemicals, and subsequent waste and wastewater management. Chromium discharge in European Union (EU) waters is subjected to nationwide recommendations, which vary depending on the type of industry and receiving water body. Once in water, chromium mainly occurs in two oxidation states Cr (III) and Cr (VI) and related ion forms depending on pH values, redox potential, and presence of natural reducing agents. Public concerns with chromium are primarily related to hexavalent compounds owing to their toxic effects on humans, animals, plants, and microorganisms. Risks for human health range from skin irritation to DNA damages and cancer development, depending on dose, exposure level, and duration. Remediation strategies commonly used for Cr (VI) removal include physico-chemical and biological methods. This work critically presents their advantages and disadvantages, suggesting a site-specific and accurate evaluation for choosing the best available recovering technology.

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“…Potentially toxic metal contaminants may interact with ecosystem native inhabitant; therefore those bacteria can develop some mechanisms of tolerance allowing them to survive 46 . This co-occurrence of such antibiotic/ metal resistance has been reported 47 .…”

Section: Elements Supplemented Concentrations (Ppm)mentioning

confidence: 99%

Detection of Heavy Metal Tolerance among different MLSB Resistance Phenotypes of Methicillin-Resistant S. aureus (MRSA)

Mohamed¹,

Elshahed²,

Saied³

et al. 2020

J Pure Appl Microbiol

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Methicillin-resistant Staphylococcus aureus (MRSA) strains are widespread globally. Besides their virulence factors, the co-occurrence of antimicrobial and metal resistance has been reported. This study was designed to evaluate the antibiotic resistance and resistance phenotypes, investigate the occurrence of virulence factors, and detect heavy metal tolerance among MRSA strains. Antibiogram profiling was done as recommended by CLSI instructions. Resistance phenotypes were detected by D test, followed by characterization of enzymatic activities and biofilm formation assay. Antibacterial activity of different heavy metals was tested, and predictable synergistic assay was performed. Among MRSA strains collected, high resistance to ampicillin and amoxicillin/clavulanate (100%) and high susceptibility to clindamycin (70%) were obtained. Resistance phenotypes were detected as S, constitutive MLSB, inducible MLSB, and MS by percentages of 10%, 30%, 30% and 30% respectively. Virulence factors like lipolytic (50%) and hemolytic (70%) activity, and biofilm formation ability (100%) were detected. High resistance towards potassium and magnesium was observed. MTC of 500 ppm was detected for all isolates in case of cobalt and iron. In case of zinc and copper, MTC was detected as 500 ppm except for one isolate which was highly resistant, and 500 ppm for all isolates except for two isolates which were highly sensitive respectively. Magnesium in different concentrations (500 and 2000 ppm) showed synergistic activity with erythromycin and clindamycin. Results reveal high heavy metal tolerance among antibiotic resistant MRSA strains, in addition to the presence of virulence factors. Upcoming studies must be focused on the combination of sub-inhibitory concentration of different heavy metals with the available antibiotics.

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Reduction of chromium-VI by chromium-resistant Escherichia coli FACU: a prospective bacterium for bioremediation

Cited by 46 publications

References 42 publications

Improving Wastewater Treatment Using Dried Banana Leaves and Bacteriophage Cocktail

Improving Wastewater Treatment Using Dried Banana Leaves and Bacteriophage Cocktail

Chromium Pollution in European Water, Sources, Health Risk, and Remediation Strategies: An Overview

Detection of Heavy Metal Tolerance among different MLSB Resistance Phenotypes of Methicillin-Resistant S. aureus (MRSA)

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