Degradation of hexachlorocyclohexane (HCH; α, β, γ and δ) by Bacillus circulans and Bacillus brevis isolated from soil contaminated with HCH

Gupta, Archna; Kaushik, C. P.; Kaushik, Anubha

doi:10.1016/s0038-0717(00)00072-9

Cited by 53 publications

(24 citation statements)

References 9 publications

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“…[25][26][27] Aerobic biodegradation has also been reported, with the data suggesting that HCHs could be cometabolized in the environment and, under certain conditions, could serve as the sole source of carbon for microorganisms. [28][29][30][31][32][33] Structural factors influence the reactivity of the HCHs as well as the type of reactions they might be expected to undergo. A detailed understanding of key physicochemical properties, preferred reaction mechanisms, and potential intermediates is essential to understand the overall environmental fate of HCHs.…”

Section: Introductionmentioning

confidence: 99%

Hexachlorocyclohexanes in the Environment: Mechanisms of Dechlorination

Elliott

Spear

et al. 2011

Critical Reviews in Environmental Science and Technology

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The hexachlorocyclohexanes (HCHs) are a very well known and widely studied class of organochlorine pesticides. Because of their widespread global usage over the past 5 decades, HCHs are ubiquitous in the environment. With the molecular formula of C 6 H 6 Cl 6 , there are 8 known HCH isomers, which differ in the axial versus equatorial orientation of the chlorine substituents. Among these isomers, alpha (α), gamma (γ ), beta (β), and delta (δ), HCHs are of major environmental significance. The authors' primary objective is to review the properties, reactivity, and chemical reaction pathways of HCHs in the context of natural attenuation and accelerated remediation of HCHs. The structural differences contributing to the varying physical and chemical properties of the isomers, classical reaction pathways of substitution, nonreductive elimination, and reductive elimination, are summarized and discussed. In addition, recent research results on the application of nanoscale zero valent iron for treatments of HCH-contaminated groundwater are also presented.

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Section: Introductionmentioning

confidence: 99%

Hexachlorocyclohexanes in the Environment: Mechanisms of Dechlorination

Elliott

Spear

et al. 2011

Critical Reviews in Environmental Science and Technology

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“…Bacillus circulans and Bacillus brevis, isolated from soil contaminated with HCH and acclimatized to different concentrations of HCH for more than 2 years, degraded hexacholorocyclohexane isomers including γ-HCH at a significantly high rate (Gupta et al, 2000). Pandoraea sp.…”

Section: Microbial Degradation Of Lindanementioning

confidence: 99%

Microbial degradation of gamma-hexachlorocyclohexane (lindane)

Girish¹,

Kunhi²

2013

Afr. J. Microbiol. Res.

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Organochloride compounds are known to be highly toxic and persistent, causing serious water and soil pollution. Hexachlorocyclohexane (HCH) is the term which collectively identifies the eight isomers of the hexachlorocyclohexane and they are denoted by the greek letters α, β, γ, δ, etc. Among the eight isomers, gamma-hexachlorocyclohexane (γ-HCH or lindane), is the only one with insecticidal properties. γ-HCH has been mainly used in agriculture and vector control programmes. HCH isomers are recognized for their toxicity, persistence in the environment and potential carcinogenic effects. Lindane is a neurotoxin that interferes with GABA neurotransmittor function. In humans, lindane affects the nervous system, liver and kidneys, and may be a carcinogen. Because of this, lindane, a cheap and effective insecticide, is banned in many other countries, while still being used or have been banned only recently in India. Their extensive use has resulted in a widespread occurrence of residues in the environment and in food products. Residues of γ-HCH have been reported from different soil and water systems in India. Efforts have been made for the remediation of soils and groundwater contaminated with the toxic and persistent HCH isomers through biodegradation processes. Microorganisms capable of degrading HCH isomers have received considerable attention as they provide the possibility to be utilized for in situ detoxification. γ-HCH degrading microorganisms, many bacteria and a few fungi, have been isolated and employed for bioremediation of lindane contaminated soil and water systems. The genes and enzymes involved in the γ-HCH degradation pathway have been investigated.

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“…Many biodegrading microorganisms belong to the genera Acinetobacter (Luckarift et al 2011), Alcanivorax (Hassanshahian et al 2014), Bacillus (Gupta et al 2000), Burkholderia (Mohanty, Mukherji 2008), Marinobacter, Pseudomonas (Abed et al 2014), Rhodococcus (Kundu et al 2016), Sphingomonas (Matsumura et al 2015) and Thalassolituus (Crisafi et al 2016). Szulc et al (2014) (Simarro et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Immobilization of bacterial association in alginate beads for bioremediation of oil-contaminated lands

2017

EEB

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Entrapment in alginate gel is a widely used approach for immobilization of microorganisms to improve their viability. A natural bacterial association consisting of seven strains isolated from acid tar-contaminated soil was used for immobilization in alginate gel. The aim of this study was to identify conditions for entrapment of a bacterial association and to determine conditions for its prolonged storage. The association was successfully immobilized in 1.5% alginate beads that were 2 mm in diameter. All tested treatments, with or without 5% clay, with or without 10% glycerol, and with or without incubation of prepared beads in nutrient medium or 0.2 M solution of CaCl 2 , showed good results in terms of survival of bacteria immediately after entrapment in gel and during at least six months storage of beads at temperature of 4 and 20 °C. The number of bacterial colony-forming units increased by 1.1 to 1.3 log g -1 in clay-containing beads during the experiment, regardless of storage temperature but it remained at baseline levels in other treatments. Further studies are necessary to evaluate bioremediation activities of the immobilized association in laboratory and field conditions.

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Degradation of hexachlorocyclohexane (HCH; α, β, γ and δ) by Bacillus circulans and Bacillus brevis isolated from soil contaminated with HCH

Cited by 53 publications

References 9 publications

Hexachlorocyclohexanes in the Environment: Mechanisms of Dechlorination

Hexachlorocyclohexanes in the Environment: Mechanisms of Dechlorination

Microbial degradation of gamma-hexachlorocyclohexane (lindane)

Immobilization of bacterial association in alginate beads for bioremediation of oil-contaminated lands

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