2013
DOI: 10.1371/journal.pone.0061682
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“Rational” Management of Dichlorophenols Biodegradation by the Microalga Scenedesmus obliquus

Abstract: The microalga Scenedesmus obliquus exhibited the ability to biodegrade dichlorophenols (dcps) under specific autotrophic and mixotrophic conditions. According to their biodegradability, the dichlorophenols used can be separated into three distinct groups. Group I (2,4-dcp and 2,6 dcp – no meta-substitution) consisted of quite easily degraded dichlorophenols, since both chloride substituents are in less energetically demanding positions. Group II (2,3-dcp, 2,5-dcp and 3,4-dcp – one meta-chloride) was less susce… Show more

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Cited by 28 publications
(19 citation statements)
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“…While in higher concentration the micro-organism directs energy to biodegradation instead of growth leading to higher DCP removal per cell. Such observation was also reported by Papazi and Kotzabasis that the degradation of high toxic dichlorophenol congener is higher as compared to low toxic dichlorophenol congener and monochlorophenol [22]. The micro-organism use a different bioenergetic strategy in such a way so that there is balance between the 2,4-DCP biodegradability, 2,4-DCP toxicity and growth.…”
Section: Biodegradation Kinetic Of 24-dcpsupporting
confidence: 62%
“…While in higher concentration the micro-organism directs energy to biodegradation instead of growth leading to higher DCP removal per cell. Such observation was also reported by Papazi and Kotzabasis that the degradation of high toxic dichlorophenol congener is higher as compared to low toxic dichlorophenol congener and monochlorophenol [22]. The micro-organism use a different bioenergetic strategy in such a way so that there is balance between the 2,4-DCP biodegradability, 2,4-DCP toxicity and growth.…”
Section: Biodegradation Kinetic Of 24-dcpsupporting
confidence: 62%
“…An extremely high yield in hydrogen productivity appeared in Scenedesmus obliquus cultures when one meta-substituted dichlorophenols (m-dcps) was added to the culture medium [6,7]. Reduced m-dcps, according to their redox potential, take the place of electron donors in the photosynthetic electron flow, close to the PQ-pool.…”
Section: Introductionmentioning
confidence: 99%
“…Additionally, the first step of m-dcps biodegradation (the reduction of m-dcps) supports a continuous circuit between oxidized and reduced m-dcps, which promotes strong electron flow to the PQ-pool, and in turn to Fd and to hydrogenase. Oxygen depletion was achieved not only by the inhibition of PSII activity, but was also induced by the combinational transfer of electrons from reduced m-dcps to the ubiquinone of the mitochondrial respiratory mechanism (cytochromic and alternative pathways) [6,7].…”
Section: Introductionmentioning
confidence: 99%
“…The toxicity of the MCPs increased in the order of 2‐CP < 4‐CP < 3‐CP. The dechlorination of the meta ‐chloride residue is a more energy demanding process than for the ortho ‐ and para ‐positions indicating the higher toxicity of 3‐CP . The substrate inhibition phase was reached at lower concentrations for 3‐CP due to its higher toxicity as compared to 4‐CP.…”
Section: Resultsmentioning
confidence: 99%