Stability of bacterial populations in tropical soil upon exposure to Lindane

Rodríguez, Roberto; Toranzos, Gary A.

doi:10.1007/s10123-003-0137-9

Cited by 14 publications

(6 citation statements)

References 29 publications

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“…Feidieker et al (1994) reported reduced microbial diversity in soil containing HCHs (up to 11,055 mg kg )1 ) and other chlorinated aromatic compounds (up to 18,500 mg kg )1 CB and 132 mg kg )1 CP), using selective culture techniques, metabolic testing on microtitre plates and fatty acid analyses. In a 70-day study, Rodriguez & Toranzos (2003) used Biolog, 16S rDNA and denaturing gradient gel electrophoresis (DGGE) analyses to monitor the diversity of bacteria in a tropical soil with a history of HCH contamination and spiked with 100 mg kg )1 c-HCH. Within two weeks, overall bacterial cell numbers were reduced by 50% relative to the non-spiked control.…”

Section: Hch Concentrationmentioning

confidence: 99%

Biodegradation of hexachlorocyclohexane (HCH) by microorganisms

Seech²,

et al. 2005

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The organochlorine pesticide Lindane is the gamma-isomer of hexachlorocyclohexane (HCH). Technical grade Lindane contains a mixture of HCH isomers which include not only gamma-HCH, but also large amounts of predominantly alpha-, beta- and delta-HCH. The physical properties and persistence of each isomer differ because of the different chlorine atom orientations on each molecule (axial or equatorial). However, all four isomers are considered toxic and recalcitrant worldwide pollutants. Biodegradation of HCH has been studied in soil, slurry and culture media but very little information exists on in situ bioremediation of the different isomers including Lindane itself, at full scale. Several soil microorganisms capable of degrading, and utilizing HCH as a carbon source, have been reported. In selected bacterial strains, the genes encoding the enzymes involved in the initial degradation of Lindane have been cloned, sequenced, expressed and the gene products characterized. HCH is biodegradable under both oxic and anoxic conditions, although mineralization is generally observed only in oxic systems. As is found for most organic compounds, HCH degradation in soil occurs at moderate temperatures and at near neutral pH. HCH biodegradation in soil has been reported at both low and high (saturated) moisture contents. Soil texture and organic matter appear to influence degradation presumably by sorption mechanisms and impact on moisture retention, bacterial growth and pH. Most studies report on the biodegradation of relatively low (< 500 mg/kg) concentrations of HCH in soil. Information on the effects of inorganic nutrients, organic carbon sources or other soil amendments is scattered and inconclusive. More in-depth assessments of amendment effects and evaluation of bioremediation protocols, on a large scale, using soil with high HCH concentrations, are needed.

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Section: Hch Concentrationmentioning

confidence: 99%

Biodegradation of hexachlorocyclohexane (HCH) by microorganisms

Seech²,

et al. 2005

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“…1, which revealed the microbial metabolic activity in the aged oil sludge (Rodriguez and Toranzos, 2003). Logistic model was applied to fit the data points according to Nakatani et al (2012).…”

Section: Resultsmentioning

confidence: 99%

Temporal Changes in Microbial Metabolic Characteristics in Field-Scale Biopiles Composed of Aged Oil Sludge

Xiang

Guo

et al. 2014

Environmental Engineering Science

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Disposal of oil sludge, a hazardous waste, is currently a prevalent environmental issue. In this study, two field-scale biopiles were constructed to explore the temporal changes of microbial metabolic characteristics during the biotreatment of aged oil sludge. Bulking agent was mixed thoroughly with oily sludge to form a treated pile. The BIOLOGÔ system was used to analyze the community level physiological parameters, including microbial metabolic activity, diversity, and variance. In comparison with the control, the community level physiological parameters of the treated pile were dramatically improved. Microbial metabolic activity of the treated pile was improved by 25.06% calculated from the maximums during the treatment. Microbial diversity index (Shannon index) ranges were improved from 1.64-3.02 (control pile) to 2.34-3.14 (treated pile). The numbers of petroleum-degrading bacteria and the total heterotrophic bacteria were correlated with the environmental temperature, and microbial metabolic characteristics in the treated pile revealed the distinctive carbon resources selection with the addition of cotton stalk. Temporal microbial metabolic characteristics, which have important effect on bioremediation, were revealed in this study.

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“…The growth and activity of denitrifying bacteria was adversely affected by lindane (Sáez et al, 2006). A reduction of 50% in bacterial cell concentration was observed in lindane-amended soil microcosms (Rodríguez and Toranzos, 2003). HCH also reduces plant seed germination and seedling viguor (Bidlan et al, 2004).…”

Section: Lindane In the Environmentmentioning

confidence: 96%

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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Stability of bacterial populations in tropical soil upon exposure to Lindane

Cited by 14 publications

References 29 publications

Biodegradation of hexachlorocyclohexane (HCH) by microorganisms

Biodegradation of hexachlorocyclohexane (HCH) by microorganisms

Temporal Changes in Microbial Metabolic Characteristics in Field-Scale Biopiles Composed of Aged Oil Sludge

Microbial degradation of gamma-hexachlorocyclohexane (lindane)

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