Assessing Resistance and Bioremediation Ability of Enterobacter sp. Strain Saw-1 on Molybdenum in Various Heavy Metals and Pesticides

Sabullah, Mohd Khalizan; Rahman, Mohd Fadhil; Ahmad, Siti Aqlima; Sulaiman, Mohd Rosni; Shukor, Mohd Shukri; Shamaan, Nor Aripin; Shukor, Mohd Yunus

doi:10.5614/j.math.fund.sci.2017.49.2.8

Cited by 7 publications

(7 citation statements)

References 42 publications

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“…A concentration of copper at 1.0 mg/L leads to a complete cessation of reduction. This was also observed in many Mo-reduction works [32][33][34][35][36][37][38][39][40][41].…”

Section: Resultssupporting

confidence: 72%

Modelling the Effect of Copper on the Mo-reduction Rate of the Antarctic Bacterium Pseudomonas sp. strain DRY1

Rahman¹,

Ahmad²,

MacCormack³

et al. 2017

J Environ Microbiol Toxicol

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Molybdenum reduction by the Antarctic bacterium Pseudomonas sp. strain DRY1 is strongly inhibited by copper. Mo reduction by this bacterium at 10 mM sodium molybdate shows a sigmoidal pattern with lag periods ranging from 7 to 10 h at various concentrations of copper. As the concentration of copper was increased, the overall Mo reduction rate was inhibited with 1.2 mg/L causing the cessation of Mo reduction rate. The modified Gompertz model was utilized to obtain Mo reduction rates at different concentrations of copper. The Mo reduction rates obtained from the modified Gompertz model was then modelled according to the modified Han-Levenspiel, Wang, Liu, modified Andrews and the Amor models. Out of the five models, only Wang, modified Han-Levenspiel and the Liu models were able to fit the curve, whilst the modified Andrews and Amor models were unable to fit the curves. Both the Wang and modified Han-Levenspiel models show acceptable fitting while the Liu model shows poor fitting. Results of the statistical analysis showed that the modified Han-Levenspiel model was the best model based on the lowest values for RMSE and AICc, highest adjusted correlation coefficient (adR2) and values of AF and BF closest to unity. The parameters obtained from the modified Han Levenspiel model, which were Ccrit, ïmax and m which represent critical heavy metal ion concentration (mg/l), maximum reduction rate (nmole Mo blue/h) and empirical constant values were 0.225 (95%, confidence interval from 0.198 to 0.251), 1.200 (95%, confidence interval from 1.180 to 1.220) and 0.443 (95%, confidence interval from 0.261 to 0.626). The modified Han-Levenspiel accurately predicted the critical copper concentration that completely inhibited molybdenum reduction rate in this bacterium.

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“…A concentration of copper at 1.0 mg/L leads to a complete cessation of reduction. This was also observed in many Mo-reduction works [32][33][34][35][36][37][38][39][40][41].…”

Section: Resultssupporting

confidence: 72%

Modelling the Effect of Copper on the Mo-reduction Rate of the Antarctic Bacterium Pseudomonas sp. strain DRY1

Rahman¹,

Ahmad²,

MacCormack³

et al. 2017

J Environ Microbiol Toxicol

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“…Moreover, dimethoate can act as an electron donor to generate excited electrons and form free radical cations. 52 The electrons are transferred to the rGO sheets, where they react with surface-adsorbed O 2 to form free radicals.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic degradation of an organophosphorus pesticide using a ZnO/rGO composite

Zhu

Guo

et al. 2020

RSC Adv.

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“…2017 ). Since soils in Malaysia could reach temperatures as high as 35°C ( Sabullah et al . 2017 ; Shukor et al .…”

Section: Discussionmentioning

confidence: 99%

Biodegradation of Petroleum Sludge by Methylobacterium sp. Strain ZASH

Harumain¹,

Mohamad²,

Nordin³

et al. 2023

tlsr

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A bacterium was isolated from sludge-contaminated soil in a petroleum refinery and tested for its ability to degrade aliphatic hydrocarbon compounds present in petroleum sludge. The isolate was grown on minimal salt media agar supplemented with 1% (w/v) petroleum sludge. The isolate was tentatively identified as Methylobacterium s p. s train ZASH based on the partial 16s rDNA molecular phylogeny. The bacterium grew optimally between the temperatures of 30°C and 35°C, pH 7 and 7.5, 0.5% and 1.5% (v/v) Tween 80 as the surfactant, and between 1% and 2% (w/v) peptone as the nitrogen source. The constants derived from the Haldane equation were ?max = 0.039 hr–1, Ks = 0.385% (w/v) total petroleum hydrocarbons (TPH) or 3,850 mg/L TPH, and Ki =1.12% (w/v) TPH or 11,200 mg/L. The maximum biodegradation rate exhibited by this strain was 19 mg/L/hr at an initial TPH concentration of 10,000 mg/L. Gas chromatography analysis revealed that after 15 days the strain was able to degrade all aliphatic n-alkanes investigated with different efficiencies. Shorter n-alkanes were generally degraded more rapidly than longer n-alkanes with 90% removal for C-12 compared to only 30% removal for C-36. The addition of sawdust did not improve bacterial degradation of petroleum hydrocarbons, but it assisted in the removal of remaining undegraded hydrocarbons through adsorption.

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Assessing Resistance and Bioremediation Ability of Enterobacter sp. Strain Saw-1 on Molybdenum in Various Heavy Metals and Pesticides

Cited by 7 publications

References 42 publications

Modelling the Effect of Copper on the Mo-reduction Rate of the Antarctic Bacterium Pseudomonas sp. strain DRY1

Modelling the Effect of Copper on the Mo-reduction Rate of the Antarctic Bacterium Pseudomonas sp. strain DRY1

Photocatalytic degradation of an organophosphorus pesticide using a ZnO/rGO composite

Biodegradation of Petroleum Sludge by Methylobacterium sp. Strain ZASH

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