355 research outputs found
Recommended from our members
Application of Microemulsion to remediate Organochlorine Pestici
No full textMicroemulsion, a system containing water, surfactant, cosurfactant and oil phase, has the potential to enhance the solubility and bioavailability of hydrophobic organic compounds (HOCs). The aim of this study is to develop microemulsion which could enhance the bioremediation of organochlorine pesticides (OCPs) contaminated soils. After screening four surfactants and two plant oils, Triton X-100 and linseed oil were selected for microemulsion formation because of their respective instinctive higher solubilizing capacity over other candidates. Microemulsions formed with Triton X-100 and linseed oil could effectively enhance the aqueous solubility of 1,1,1,-trichloro-2,2-bis(p-chlorophenyl) ethane (DDT), and the enhancement was much higher than that achieved by Triton X-100 solution alone. Besides, the solubilization capacity of Triton X-100-linseed oil system was positively influenced by both cosurfactant (C/S ratios) and oil (O/S ratios) contents of the microemulsions. Desorption tests reveal that this microemulsion system is more effective than its counterpart Triton X-100 solution to desorb DDT from contaminated soil.The authors thank the Research Grant Council of the Hong Kong Special Administrative Region, People’s Republic of China (Grant HKBU261607) for the financial support
Persistency of Bacterial Indicators in Biosolids Stabilization with Coal Fly Ash and Lime
No full text
Rapid degradation of lindane (γ-hexachlorocyclohexane) at low temperature by Sphingobium strains
No full textRecommended from our members
Biosurfactants from Acinetobacter calcoaceticus BU03 Enhance the
No full textBiosurfactants produced by an isolated thermophilic strain Acinetobacter calcoaceticus BU03 were demonstrated to be effective in enhancing the solubility of polycyclic aromatic hydrocarbons (PAHs) and the present study aimed at investigating its effectiveness in increasing bioavailability of PAHs in soil for biodegradation under thermophilic composting condition. At 25 times of its critical micelle concentration (CMC), biosurfactants by BU03 significantly increased the apparent aqueous solubility of phenanthrene (PHE) and benzo[a]pyrene (B[a]P) to 54.3 and 2.08 mg L-1, respectively. After confirmation of its ability in enhancing the solubility of PAHs, the isolated biosurfactants were applied to a thermophilic soil composting system. Within 42 days of composting period, the degradation of PHE and B[a]P in the absence of the biosurfactants was 71.2 and 16.4%, respectively. Inoculation of A. calcoaceticus BU03 or biosurfactants produced by this strain significantly increased the emulsifying capacity of soil, and therefore enhanced the desorption of PAHs from soil to aqueous phase in which they can be degraded by an inoculated degradative strain Bacillus subtilis B-UM. Therefore inoculation of A. calcoaceticus BU03 or biosurfactants from BU03 together with inoculation of B. subtilis B-UM increased the degradation of B[a]P to 83.8 and 65.1%, respectively, while PHE was almost completely removed with these two treatments. The results indicate that the application of biosurfactants produced by A. calcoaceticus is an effective means to enhance the biodegradation of PAHs in thermophilic composting, while inoculation of biosurfactants producing strains in PAHs contaminated soil is a more practical and cost-effective approach than direct addition of biosurfactants
Role of non‐ionic surfactants and plant oils on the solubilization of organochlorine pesticides by oil‐in‐water microemulsions
No full textErratum to: Segregation of mitochondrial DNA heteroplasmy through a developmental genetic bottleneck in human embryos (Nature Cell Biology, (2018), 20, 2, (144-151), 10.1038/s41556-017-0017-8)
No full textIn the version of this Letter originally published, an author error led to the affiliations for Brendan Payne, Jonathan Coxhead and Gavin Hudson being incorrect. The correct affiliations are: Brendan Payne:3Wellcome Trust Centre for Mitochondrial Research, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK.6Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, UK; this is a new affiliation 6 and subsequent existing affiliations have been renumbered. Jonathan Coxhead:11Genomic Core Facility, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK; this is a new affiliation 11 and subsequent existing affiliations have been renumbered. Gavin Hudson:3Wellcome Trust Centre for Mitochondrial Research, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK. In addition, in Fig. 2d, the numbers on the x-axis of the left plot were incorrectly labelled as negative; they should have been positive. These errors have now been corrected in all online versions of the Letter
A short note on business cycles of underground output: are they asymmetric?
No full textThis short note as the first study investigates the symmetry of fluctuations of underground output around trend for four selected Southeast Asian countries, that is, Malaysia, Indonesia, Thailand, and Philippines, over the time horizon of 1970-2006. In particular, we test if the underground output falls below trend more drastically and severely at shorter time span than when rising above trend. We find no evidence that supports this hypothesis. We thus conclude that asymmetry in fluctuations around trend is not a primary concern in understanding the nature of underground economy. We suggest that the symmetry of fluctuation of underground output, in conjunction with the potential complementary effect on market consumption, may account for the widely documented expansionary fiscal contraction in developing countries.Underground economy
- …
