their small size and abundance. The acute and chronic effects from exposure to this dust have not... more their small size and abundance. The acute and chronic effects from exposure to this dust have not been well studied nor has the dust been characterized as to its chemical composition, mineral content, or microbial flora. Experiments were designed to study the Middle East dust as to its physical, chemical, and biological characteristics. Kuwaiti and Iraqi dust samples from different locations were collected and processed. Initial chemical and physical characterization of each sample including particle size distribution and inorganic analysis was conducted using ICP-MS for 57 different elements. Finally, characterization of biologic flora was performed using classical microbiological and molecular techniques to identify microbes and fungi. The results from this study suggest that further research may be warranted to provide insight into potential health risks.
U.S. laws require that contaminant bioaccumulation potential be evaluated before dredged material... more U.S. laws require that contaminant bioaccumulation potential be evaluated before dredged material can be recycled. Simple fugacity models, e.g. organic contaminant aqueous partition coefficient ( K oc)-derived theoretical bioaccumulation potential, are commonly used to estimate the partitioning of hydrophobic organic contaminants between sediment organic matter and organism lipid. K oc-derived models, with or without the addition of a soot carbon
A study was conducted to determine the potential positive effect of novel biosurfactants on the e... more A study was conducted to determine the potential positive effect of novel biosurfactants on the enhancement of Aroclor 1248 metabolization in both in vitro and in situ experiments. Among two lipopeptides tested the highest activity was found in experiments with a hydrolytically opened form of lichenysin A. Lichenysin A itself did not enhance the degradation activity of chosen microorganism-degraders and in most cases inhibited their PCB mineralization rates. Glucolipid surfactant from marine bacterium Alcanivorax borkumensis showed in several tests a strong enhancing effect on microbial metabolization of Aroclor 1248 congeners. Biosurfactants appeared to act very specifically, i.e. depending on strain and concentration used. Experiments set up with soil samples did not give a clear answer whether bioemulsifiers applied at low concentration could sufficiently increase the rates of biodegradation in situ. Only A. borkumiensis glucose lipid caused the most marked enhancement of Aroclor 1248 metabolization in soil microcosm. We suggest that taking into account the specificity of surface- and biological activities of various biosurfactants they may promote the mineralization of sorbed PCBs in polluted soils, when the optimized biosurfactant-degrader combination is used.
... For example, using 40 primer sets, Stiller and Denton (1995) found 70 RAPD fragments with 29 ... more ... For example, using 40 primer sets, Stiller and Denton (1995) found 70 RAPD fragments with 29 polymorphic sites or 41% polymorphism. Kirsten et al. ... Genetics 151 (1999), pp. 1157–1164. View Record in Scopus | Cited By in Scopus (69). Kirsten et al., 1998. ...
... Marc Vancanneyti 1 , a , Sabine Witt 2 , Wolf-Rainer Abraham 2 , Karel Kersters 1 , Herb L. F... more ... Marc Vancanneyti 1 , a , Sabine Witt 2 , Wolf-Rainer Abraham 2 , Karel Kersters 1 , Herb L. Fredrickson 2 , Corresponding Author Contact Information. ... lipid fractions (Fredrickson classified in a number of different genera (Kersters et al., et al., 1986; Skerratt et al., 1991; Nunes et al ...
Introduction The purpose of this work was to document testing and analysis of upland disposal of ... more Introduction The purpose of this work was to document testing and analysis of upland disposal of dredged material potentially impacted with dichlorodiphenyl-trichloroethane (DDT) from the Little Sunflower River, Mississippi. Bench-scale efforts were directed towards the ...
their small size and abundance. The acute and chronic effects from exposure to this dust have not... more their small size and abundance. The acute and chronic effects from exposure to this dust have not been well studied nor has the dust been characterized as to its chemical composition, mineral content, or microbial flora. Experiments were designed to study the Middle East dust as to its physical, chemical, and biological characteristics. Kuwaiti and Iraqi dust samples from different locations were collected and processed. Initial chemical and physical characterization of each sample including particle size distribution and inorganic analysis was conducted using ICP-MS for 57 different elements. Finally, characterization of biologic flora was performed using classical microbiological and molecular techniques to identify microbes and fungi. The results from this study suggest that further research may be warranted to provide insight into potential health risks.
U.S. laws require that contaminant bioaccumulation potential be evaluated before dredged material... more U.S. laws require that contaminant bioaccumulation potential be evaluated before dredged material can be recycled. Simple fugacity models, e.g. organic contaminant aqueous partition coefficient ( K oc)-derived theoretical bioaccumulation potential, are commonly used to estimate the partitioning of hydrophobic organic contaminants between sediment organic matter and organism lipid. K oc-derived models, with or without the addition of a soot carbon
A study was conducted to determine the potential positive effect of novel biosurfactants on the e... more A study was conducted to determine the potential positive effect of novel biosurfactants on the enhancement of Aroclor 1248 metabolization in both in vitro and in situ experiments. Among two lipopeptides tested the highest activity was found in experiments with a hydrolytically opened form of lichenysin A. Lichenysin A itself did not enhance the degradation activity of chosen microorganism-degraders and in most cases inhibited their PCB mineralization rates. Glucolipid surfactant from marine bacterium Alcanivorax borkumensis showed in several tests a strong enhancing effect on microbial metabolization of Aroclor 1248 congeners. Biosurfactants appeared to act very specifically, i.e. depending on strain and concentration used. Experiments set up with soil samples did not give a clear answer whether bioemulsifiers applied at low concentration could sufficiently increase the rates of biodegradation in situ. Only A. borkumiensis glucose lipid caused the most marked enhancement of Aroclor 1248 metabolization in soil microcosm. We suggest that taking into account the specificity of surface- and biological activities of various biosurfactants they may promote the mineralization of sorbed PCBs in polluted soils, when the optimized biosurfactant-degrader combination is used.
... For example, using 40 primer sets, Stiller and Denton (1995) found 70 RAPD fragments with 29 ... more ... For example, using 40 primer sets, Stiller and Denton (1995) found 70 RAPD fragments with 29 polymorphic sites or 41% polymorphism. Kirsten et al. ... Genetics 151 (1999), pp. 1157–1164. View Record in Scopus | Cited By in Scopus (69). Kirsten et al., 1998. ...
... Marc Vancanneyti 1 , a , Sabine Witt 2 , Wolf-Rainer Abraham 2 , Karel Kersters 1 , Herb L. F... more ... Marc Vancanneyti 1 , a , Sabine Witt 2 , Wolf-Rainer Abraham 2 , Karel Kersters 1 , Herb L. Fredrickson 2 , Corresponding Author Contact Information. ... lipid fractions (Fredrickson classified in a number of different genera (Kersters et al., et al., 1986; Skerratt et al., 1991; Nunes et al ...
Introduction The purpose of this work was to document testing and analysis of upland disposal of ... more Introduction The purpose of this work was to document testing and analysis of upland disposal of dredged material potentially impacted with dichlorodiphenyl-trichloroethane (DDT) from the Little Sunflower River, Mississippi. Bench-scale efforts were directed towards the ...
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