Mechanisms of Bacterial Heavy Metal Resistance and Homeostasis

Srivastava, Pallavee; Kowshik, Meenal

doi:10.1201/b22013-2

Cited by 4 publications

(1 citation statement)

References 1 publication

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“…Properly treated, this material can be used to remove heavy metals from water, as well as organic compounds. Heavy metals have a high atomic weight and a density at least 5 times greater than that of water [11][12][13][14]. They are naturally occurring elements that comprise essential (e.g., Fe, Cu, and Zn) and nonessential metals (e.g., Cd, Hg, and Pb) [15,16].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies

Andia

Reátegui-Romero

Peña-Contreras

et al. 2022

Adsorption Science & Technology

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Cadmium (Cd) is a highly toxic heavy metal considered carcinogenic to humans. The adsorption behavior of cadmium adsorption using untreated and chemically modified rice husk was investigated. Experimental tests were carried out to evaluate the influence of the variables pH, initial concentration of cadmium, and dosage of adsorbent in the adsorption process. In optimal experimental conditions, the maximum adsorption efficiency was 92.65%. Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) were used allowing the identification of the main functional groups and morphology of rice husk and treated rice husk, and the results showed an improvement of adsorption characteristics after rice husk treatment with NaOH. The optimum adsorption pH for both types of rice husk was 7. The maximum adsorption capacities of RH and treated RH fitted by the Langmuir model were 5.13 mg/g and 11.06 mg/g, respectively. The pseudosecond order kinetics has the best coefficients of determination for untreated ( R 2 = 0.992 ) and treated ( R 2 = 0.999 ) rice husk. The adsorption process was found to be endothermic in nature with enthalpy of 14.08 kJ/mol and entropy of 170.98 J/mol.K. The calculated activation energy was 24 kJ/mol. The results showed the potential of rice husk as a low-cost, easily managed, and efficient biosorbent for Cd removal from waters.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies

Andia

Reátegui-Romero

Peña-Contreras

et al. 2022

Adsorption Science & Technology

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Multiple heavy metal immobilization and strength improvement of contaminated soil using bio-mediated calcite precipitation technique

Sharma

Satyam

Reddy

et al. 2022

Environ Sci Pollut Res

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Genomic, morphological, and biochemical analyses of a multi-metal resistant but multi-drug susceptible strain of Bordetella petrii from hospital soil

Halder

Biswas

Kabiraj

et al. 2022

Sci Rep

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Contamination of soil by antibiotics and heavy metals originating from hospital facilities has emerged as a major cause for the development of resistant microbes. We collected soil samples surrounding a hospital effluent and measured the resistance of bacterial isolates against multiple antibiotics and heavy metals. One strain BMCSI 3 was found to be sensitive to all tested antibiotics. However, it was resistant to many heavy metals and metalloids like cadmium, chromium, copper, mercury, arsenic, and others. This strain was motile and potentially spore-forming. Whole-genome shotgun assembly of BMCSI 3 produced 4.95 Mb genome with 4,638 protein-coding genes. The taxonomic and phylogenetic analysis revealed it, to be a Bordetella petrii strain. Multiple genomic islands carrying mobile genetic elements; coding for heavy metal resistant genes, response regulators or transcription factors, transporters, and multi-drug efflux pumps were identified from the genome. A comparative genomic analysis of BMCSI 3 with annotated genomes of other free-living B. petrii revealed the presence of multiple transposable elements and several genes involved in stress response and metabolism. This study provides insights into how genomic reorganization and plasticity results in evolution of heavy metals resistance by acquiring genes from its natural environment.

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Mechanisms of Bacterial Heavy Metal Resistance and Homeostasis

Cited by 4 publications

References 1 publication

Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies

Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies

Multiple heavy metal immobilization and strength improvement of contaminated soil using bio-mediated calcite precipitation technique

Genomic, morphological, and biochemical analyses of a multi-metal resistant but multi-drug susceptible strain of Bordetella petrii from hospital soil

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