Bioremediation of Contaminated Environments Using Rhodococcus

Kuyukina, Maria S.; Ившина, И. Б.

doi:10.1007/978-3-030-11461-9_9

Cited by 23 publications

(15 citation statements)

References 143 publications

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“…It was experimentally confirmed that the characteristic of a constant number of Rhodococcus not influenced by sharp seasonal fluctuations is a specific feature of hydrocarbon-oxidizing bacteriocenoses in oil-producing areas. In soils heavily polluted (up to 10 wt.%) with petroleum products, the average levels of ecologically significant species R. erythropolis, R. globerulus, R. opacus, R. rhodochrous , and R. ruber are 10 4 –10 5 cells/g of soil, thus proving their role in the natural biodegradation of petroleum hydrocarbons [ 25 , 26 , 27 ]. The isolated strains are characterized by emulsifying abilities and biodegradative activities, not only towards aliphatic and aromatic hydrocarbons, and petroleum products, but also towards other recalcitrant and toxic pollutants—heterocycles, oxygenated and halogenated compounds, nitroaromatics, and organochlorine pesticides.…”

Section: Introductionmentioning

confidence: 99%

“…They tolerate high (100-250 mM or more) concentrations of toxic metals and metalloids, and organic solvents (from 20 to 80 vol.%). The strains are active in a wide range of temperatures (from 4-15 to 40 • C and above), acidity (pH from 2.0 to 9.0), and humidity (from 15 to 50%), and are able to grow at high (2-6%) salt concentrations [14,20,26,[28][29][30]. These Rhodococcus strains are the core of the Regional Specialised Collection of Alkanotrophic Microorganisms (acronym IEGM, available online at: http://www.iegmcol.ru (accessed on 20 July 2021)).…”

Section: Introductionmentioning

confidence: 99%

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Responses to Ecopollutants and Pathogenization Risks of Saprotrophic Rhodococcus Species

et al. 2021

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Under conditions of increasing environmental pollution, true saprophytes are capable of changing their survival strategies and demonstrating certain pathogenicity factors. Actinobacteria of the genus Rhodococcus, typical soil and aquatic biotope inhabitants, are characterized by high ecological plasticity and a wide range of oxidized organic substrates, including hydrocarbons and their derivatives. Their cell adaptations, such as the ability of adhering and colonizing surfaces, a complex life cycle, formation of resting cells and capsule-like structures, diauxotrophy, and a rigid cell wall, developed against the negative effects of anthropogenic pollutants are discussed and the risks of possible pathogenization of free-living saprotrophic Rhodococcus species are proposed. Due to universal adaptation features, Rhodococcus species are among the candidates, if further anthropogenic pressure increases, to move into the group of potentially pathogenic organisms with “unprofessional” parasitism, and to join an expanding list of infectious agents as facultative or occasional parasites.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Responses to Ecopollutants and Pathogenization Risks of Saprotrophic Rhodococcus Species

et al. 2021

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“…(DGGE band C 0 2) have already been tested for their ability to break down PAHs, HMW hydrocarbons and even diesel mixtures (Plotnikova et al 2011;Sivaram et al 2019;Abdulrasheed et al 2020). Members of the genus Rhodococcus (DGGE band C 0 3) can degrade organic xenobiotic pollutants, and are often used as an inoculum for the bioremediation of diesel-contaminated soils (Lee et al 2006;Kuyukina and Ivshina 2019;Roslee et al 2020). Finally, even strains related to the genera Mesorhizobium (DGGE band C 0 5) and Djella (DGGE band C 90 1) have been shown to transform some toxic hydrocarbon compounds (Qu et al 2016;Teng et al 2016).…”

Section: Discussionmentioning

confidence: 99%

Mesocosm‐based simulations to optimize a bioremediation strategy for the effective restoration of wildfire‐impacted soils contaminated with high‐molecular‐weight hydrocarbons

Andreolli

Lampis

Brignoli

et al. 2021

J of Applied Microbiology

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Aims: We obtained four microbial isolates from soil exposed to forest fire and evaluated their potential bioremediation activity when combined with a biosurfactant-producing bacterial strain for the decontamination of wildfireimpacted soil polluted with high-molecular-weight (HMW) hydrocarbons. Methods and Results: We established mesocosm trials to compare three bioremediation strategies: natural attenuation, bioaugmentation and biostimulation. Chemical analysis, culture-dependent and culture-independent methods were used to evaluate the bioremediation efficiency and speciation of the microbial cenoses based on these approaches. After treatment for 90 days, bioaugmentation removed 75Á2-75Á9% of the HMW hydrocarbons, biostimulation removed 63Á2-69Á5% and natural attenuation removed~22Á5%. Hydrocarbon degradation was significantly enhanced in the mesocosm supplemented with the biosurfactant-producing bacterial strain after 20 and 50 days of treatment compared to the other bioremediation strategies. Conclusions: We found that the bioaugmentation approach was more effective than biostimulation and natural attenuation for the removal of HMW hydrocarbons from fire-impacted soil. Significance and Impact of the Study: Our study showed that microorganisms from wildfire-impacted soil show significant potential for bioremediation, and that biosurfactant-producing bacterial strains can be combined with them as part of an effective bioremediation strategy.

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“…The genus Rhodococcus has diverse catabolic pathways, which in turn enable them to function efficiently as biocatalyst for degradation and transformation of a wide variety of natural organic and xenobiotic compounds [9]. Rhodococcus can be presented as fitting inocula for bioremediation and bioconversion due to their remarkable ability to metabolize a broad spectrum of the chemical spectrum, the capability to tolerate toxic substrate and solvents, and their persistence to thrive under extreme environmental conditions [10]. Besides, Rhodococcus possess attractive property (catabolite repression), which enabled them to metabolize pollutants such as hydrocarbons, phenols, and nitriles (organic cyanide).…”

Section: Introductionmentioning

confidence: 99%

“…Besides, Rhodococcus possess attractive property (catabolite repression), which enabled them to metabolize pollutants such as hydrocarbons, phenols, and nitriles (organic cyanide). However, relatively simpler carbon sources are present in the mixture [10]. Realizing the potential of Rhodococcus as a green biocatalyst, the Institute of Bio-IT Selangor, Universiti Selangor (Unisel) has embarked on the journey to isolate different strains of Rhodococcus from diverse resources in Peninsular Malaysia.…”

Section: Introductionmentioning

confidence: 99%

Effect of inoculum size, inducer and metal ion on lipase production by Rhodococcus strain UCC 0009

et al. 2020

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Lipases are critical enzymes for industrial applications such as in the food and pharmaceutical fields. Therefore, the discovery of new lipases with enhanced characteristics are always encouraged. Thus, the present study explored the ability of a novel bacterial strain isolated from a tropical climate for lipase production. The optimization method using the one-variable-at-a-time approach was adopted to obtain increased production of lipase. The strain identified as Rhodococcus strain UCC 0009 was able to generate specific lipase activity of 11.67a ± 0.00 mU/mg at optimized conditions of 8 % (v/v) inoculum concentration, 1 % (v/v) olive oil as the inducer, and the addition of Ca2+ions. The specific lipase activity increased by 162 % when the optimization using a one-variable-ata-time approach was adopted compared to that of the non-optimized counterpart, signifying this experimental phase’s importance. The present study’s findings revealed the potential of utilizing Rhodococcus strain UCC 0009 as a green lipase producer for application in bioremediation and biotransformation at an industrial scale. Further study concentrating on enzyme characterization and improving culture conditions for conducive production of lipase via statistical optimization using response surface methodology (RSM) will be attempted to elucidate further the superiority of lipase obtained from local resources.

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Bioremediation of Contaminated Environments Using Rhodococcus

Cited by 23 publications

References 143 publications

Responses to Ecopollutants and Pathogenization Risks of Saprotrophic Rhodococcus Species

Responses to Ecopollutants and Pathogenization Risks of Saprotrophic Rhodococcus Species

Mesocosm‐based simulations to optimize a bioremediation strategy for the effective restoration of wildfire‐impacted soils contaminated with high‐molecular‐weight hydrocarbons

Effect of inoculum size, inducer and metal ion on lipase production by Rhodococcus strain UCC 0009

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