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Mustafa Tuzen - One of the best experts on this subject based on the ideXlab platform.
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biosorption of pb ii and cd ii from aqueous solution using green alga ulva Lactuca biomass
Journal of Hazardous Materials, 2008Co-Authors: Ahmet Sari, Mustafa TuzenAbstract:Abstract The biosorption characteristics of Pb(II) and Cd(II) ions from aqueous solution using the green alga ( Ulva Lactuca ) biomass were investigated as a function of pH, biomass dosage, contact time, and temperature. Langmuir, Freundlich and Dubinin–Radushkevich (D–R) models were applied to describe the biosorption isotherm of the metal ions by U. Lactuca biomass. Langmuir model fitted the equilibrium data better than the Freundlich isotherm. The monolayer biosorption capacity of U. Lactuca biomass for Pb(II) and Cd(II) ions was found to be 34.7 mg/g and 29.2 mg/g, respectively. From the D–R isotherm model, the mean free energy was calculated as 10.4 kJ/mol for Pb(II) biosorption and 9.6 kJ/mol for Cd(II) biosorption, indicating that the biosorption of both metal ions was taken place by chemisorption. The calculated thermodynamic parameters (Δ G °, Δ H ° and Δ S °) showed that the biosorption of Pb(II) and Cd(II) ions onto U. Lactuca biomass was feasible, spontaneous and exothermic under examined conditions. Experimental data were also tested in terms of biosorption kinetics using pseudo-first-order and pseudo-second-order kinetic models. The results showed that the biosorption processes of both metal ions followed well pseudo-second-order kinetics.
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biosorption of pb ii and cd ii from aqueous solution using green alga ulva Lactuca biomass
Journal of Hazardous Materials, 2008Co-Authors: Ahmet Sari, Mustafa TuzenAbstract:Abstract The biosorption characteristics of Pb(II) and Cd(II) ions from aqueous solution using the green alga ( Ulva Lactuca ) biomass were investigated as a function of pH, biomass dosage, contact time, and temperature. Langmuir, Freundlich and Dubinin–Radushkevich (D–R) models were applied to describe the biosorption isotherm of the metal ions by U. Lactuca biomass. Langmuir model fitted the equilibrium data better than the Freundlich isotherm. The monolayer biosorption capacity of U. Lactuca biomass for Pb(II) and Cd(II) ions was found to be 34.7 mg/g and 29.2 mg/g, respectively. From the D–R isotherm model, the mean free energy was calculated as 10.4 kJ/mol for Pb(II) biosorption and 9.6 kJ/mol for Cd(II) biosorption, indicating that the biosorption of both metal ions was taken place by chemisorption. The calculated thermodynamic parameters (Δ G °, Δ H ° and Δ S °) showed that the biosorption of Pb(II) and Cd(II) ions onto U. Lactuca biomass was feasible, spontaneous and exothermic under examined conditions. Experimental data were also tested in terms of biosorption kinetics using pseudo-first-order and pseudo-second-order kinetic models. The results showed that the biosorption processes of both metal ions followed well pseudo-second-order kinetics.
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biosorption of pb ii and cd ii from aqueous solution using green alga ulva Lactuca biomass
Journal of Hazardous Materials, 2008Co-Authors: Ahmet Sari, Mustafa TuzenAbstract:The biosorption characteristics of Pb(II) and Cd(II) ions from aqueous solution using the green alga (Ulva Lactuca) biomass were investigated as a function of pH, biomass dosage, contact time, and temperature. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models were applied to describe the biosorption isotherm of the metal ions by U. Lactuca biomass. Langmuir model fitted the equilibrium data better than the Freundlich isotherm. The monolayer biosorption capacity of U. Lactuca biomass for Pb(II) and Cd(II) ions was found to be 34.7mg/g and 29.2mg/g, respectively. From the D-R isotherm model, the mean free energy was calculated as 10.4kJ/mol for Pb(II) biosorption and 9.6kJ/mol for Cd(II) biosorption, indicating that the biosorption of both metal ions was taken place by chemisorption. The calculated thermodynamic parameters (DeltaG degrees , DeltaH degrees and DeltaS degrees ) showed that the biosorption of Pb(II) and Cd(II) ions onto U. Lactuca biomass was feasible, spontaneous and exothermic under examined conditions. Experimental data were also tested in terms of biosorption kinetics using pseudo-first-order and pseudo-second-order kinetic models. The results showed that the biosorption processes of both metal ions followed well pseudo-second-order kinetics.
Pim Lindhout - One of the best experts on this subject based on the ideXlab platform.
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rin4 causes hybrid necrosis and race specific resistance in an interspecific lettuce hybrid
The Plant Cell, 2009Co-Authors: Marieke J W Jeuken, Ningwen W Zhang, Leah K Mchale, K T B Pelgrom, Erik Den Boer, Pim Lindhout, Richard W Michelmore, Richard G F Visser, R E NiksAbstract:Some inter- and intraspecific crosses may result in reduced viability or sterility in the offspring, often due to genetic incompatibilities resulting from interactions between two or more loci. Hybrid necrosis is a postzygotic genetic incompatibility that is phenotypically manifested as necrotic lesions on the plant. We observed hybrid necrosis in interspecific lettuce (Lactuca sativa and Lactuca saligna) hybrids that correlated with resistance to downy mildew. Segregation analysis revealed a specific allelic combination at two interacting loci to be responsible. The allelic interaction had two consequences: (1) a quantitative temperature-dependent autoimmunity reaction leading to necrotic lesions, lethality, and quantitative resistance to an otherwise virulent race of Bremia Lactucae; and (2) a qualitative temperature-independent race-specific resistance to an avirulent race of B. Lactucae. We demonstrated by transient expression and silencing experiments that one of the two interacting genes was Rin4. In Arabidopsis thaliana, RIN4 is known to interact with multiple R gene products, and their interactions result in hypersensitive resistance to Pseudomonas syringae. Site-directed mutation studies on the necrosis-eliciting allele of Rin4 in lettuce showed that three residues were critical for hybrid necrosis.
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Lactuca saligna a non host for lettuce downy mildew bremia Lactucae harbors a new race specific dm gene and three qtls for resistance
Theoretical and Applied Genetics, 2002Co-Authors: Marieke J W Jeuken, Pim LindhoutAbstract:Lactuca sativa (lettuce) is susceptible to Bremia Lactucae (downy mildew). In cultivated and wild Lactuca species, Dm genes have been identified that confer race-specific resistance. However, these genes were soon rendered ineffective by adaptation of the pathogen. Lactuca saligna (wild lettuce) is resistant to all downy mildew races and can be considered as a non-host. Therefore, L. saligna might be an alternative source for a more-durable resistance to downy mildew in lettuce. In order to analyze this resistance, we have developed an F2 population based on a resistant L. saligna × susceptible L. sativa cross. This F2 population was fingerprinted with AFLP markers and tested for resistance to two Bremia races NL14 and NL16. The F2 population showed a wide and continuous range of resistance levels from completely resistant to completely susceptible. By comparison of disease tests, we observed a quantitative resistance against both Bremia races as well as a race-specific resistance to Bremia race NL16 and not to NL14. QTL mapping revealed a qualitative gene (R39) involved in the race-specific resistance and three QTLs (RBQ1, RBQ2 and RBQ3) involved in the quantitative resistance. The qualitative gene R39 is a dominant gene that gives nearly complete resistance to race NL16 in L. saligna CGN 5271 and therefore it showed features similar to Dm genes. The three QTLs explained 51% of the quantitative resistance against NL14, which indicated that probably only the major QTLs have been detected in this F2 population. The perspectives for breeding for durable resistance are discussed.
Marieke J W Jeuken - One of the best experts on this subject based on the ideXlab platform.
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rin4 causes hybrid necrosis and race specific resistance in an interspecific lettuce hybrid
The Plant Cell, 2009Co-Authors: Marieke J W Jeuken, Ningwen W Zhang, Leah K Mchale, K T B Pelgrom, Erik Den Boer, Pim Lindhout, Richard W Michelmore, Richard G F Visser, R E NiksAbstract:Some inter- and intraspecific crosses may result in reduced viability or sterility in the offspring, often due to genetic incompatibilities resulting from interactions between two or more loci. Hybrid necrosis is a postzygotic genetic incompatibility that is phenotypically manifested as necrotic lesions on the plant. We observed hybrid necrosis in interspecific lettuce (Lactuca sativa and Lactuca saligna) hybrids that correlated with resistance to downy mildew. Segregation analysis revealed a specific allelic combination at two interacting loci to be responsible. The allelic interaction had two consequences: (1) a quantitative temperature-dependent autoimmunity reaction leading to necrotic lesions, lethality, and quantitative resistance to an otherwise virulent race of Bremia Lactucae; and (2) a qualitative temperature-independent race-specific resistance to an avirulent race of B. Lactucae. We demonstrated by transient expression and silencing experiments that one of the two interacting genes was Rin4. In Arabidopsis thaliana, RIN4 is known to interact with multiple R gene products, and their interactions result in hypersensitive resistance to Pseudomonas syringae. Site-directed mutation studies on the necrosis-eliciting allele of Rin4 in lettuce showed that three residues were critical for hybrid necrosis.
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Lactuca saligna a non host for lettuce downy mildew bremia Lactucae harbors a new race specific dm gene and three qtls for resistance
Theoretical and Applied Genetics, 2002Co-Authors: Marieke J W Jeuken, Pim LindhoutAbstract:Lactuca sativa (lettuce) is susceptible to Bremia Lactucae (downy mildew). In cultivated and wild Lactuca species, Dm genes have been identified that confer race-specific resistance. However, these genes were soon rendered ineffective by adaptation of the pathogen. Lactuca saligna (wild lettuce) is resistant to all downy mildew races and can be considered as a non-host. Therefore, L. saligna might be an alternative source for a more-durable resistance to downy mildew in lettuce. In order to analyze this resistance, we have developed an F2 population based on a resistant L. saligna × susceptible L. sativa cross. This F2 population was fingerprinted with AFLP markers and tested for resistance to two Bremia races NL14 and NL16. The F2 population showed a wide and continuous range of resistance levels from completely resistant to completely susceptible. By comparison of disease tests, we observed a quantitative resistance against both Bremia races as well as a race-specific resistance to Bremia race NL16 and not to NL14. QTL mapping revealed a qualitative gene (R39) involved in the race-specific resistance and three QTLs (RBQ1, RBQ2 and RBQ3) involved in the quantitative resistance. The qualitative gene R39 is a dominant gene that gives nearly complete resistance to race NL16 in L. saligna CGN 5271 and therefore it showed features similar to Dm genes. The three QTLs explained 51% of the quantitative resistance against NL14, which indicated that probably only the major QTLs have been detected in this F2 population. The perspectives for breeding for durable resistance are discussed.
Ahmet Sari - One of the best experts on this subject based on the ideXlab platform.
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biosorption of pb ii and cd ii from aqueous solution using green alga ulva Lactuca biomass
Journal of Hazardous Materials, 2008Co-Authors: Ahmet Sari, Mustafa TuzenAbstract:Abstract The biosorption characteristics of Pb(II) and Cd(II) ions from aqueous solution using the green alga ( Ulva Lactuca ) biomass were investigated as a function of pH, biomass dosage, contact time, and temperature. Langmuir, Freundlich and Dubinin–Radushkevich (D–R) models were applied to describe the biosorption isotherm of the metal ions by U. Lactuca biomass. Langmuir model fitted the equilibrium data better than the Freundlich isotherm. The monolayer biosorption capacity of U. Lactuca biomass for Pb(II) and Cd(II) ions was found to be 34.7 mg/g and 29.2 mg/g, respectively. From the D–R isotherm model, the mean free energy was calculated as 10.4 kJ/mol for Pb(II) biosorption and 9.6 kJ/mol for Cd(II) biosorption, indicating that the biosorption of both metal ions was taken place by chemisorption. The calculated thermodynamic parameters (Δ G °, Δ H ° and Δ S °) showed that the biosorption of Pb(II) and Cd(II) ions onto U. Lactuca biomass was feasible, spontaneous and exothermic under examined conditions. Experimental data were also tested in terms of biosorption kinetics using pseudo-first-order and pseudo-second-order kinetic models. The results showed that the biosorption processes of both metal ions followed well pseudo-second-order kinetics.
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biosorption of pb ii and cd ii from aqueous solution using green alga ulva Lactuca biomass
Journal of Hazardous Materials, 2008Co-Authors: Ahmet Sari, Mustafa TuzenAbstract:Abstract The biosorption characteristics of Pb(II) and Cd(II) ions from aqueous solution using the green alga ( Ulva Lactuca ) biomass were investigated as a function of pH, biomass dosage, contact time, and temperature. Langmuir, Freundlich and Dubinin–Radushkevich (D–R) models were applied to describe the biosorption isotherm of the metal ions by U. Lactuca biomass. Langmuir model fitted the equilibrium data better than the Freundlich isotherm. The monolayer biosorption capacity of U. Lactuca biomass for Pb(II) and Cd(II) ions was found to be 34.7 mg/g and 29.2 mg/g, respectively. From the D–R isotherm model, the mean free energy was calculated as 10.4 kJ/mol for Pb(II) biosorption and 9.6 kJ/mol for Cd(II) biosorption, indicating that the biosorption of both metal ions was taken place by chemisorption. The calculated thermodynamic parameters (Δ G °, Δ H ° and Δ S °) showed that the biosorption of Pb(II) and Cd(II) ions onto U. Lactuca biomass was feasible, spontaneous and exothermic under examined conditions. Experimental data were also tested in terms of biosorption kinetics using pseudo-first-order and pseudo-second-order kinetic models. The results showed that the biosorption processes of both metal ions followed well pseudo-second-order kinetics.
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biosorption of pb ii and cd ii from aqueous solution using green alga ulva Lactuca biomass
Journal of Hazardous Materials, 2008Co-Authors: Ahmet Sari, Mustafa TuzenAbstract:The biosorption characteristics of Pb(II) and Cd(II) ions from aqueous solution using the green alga (Ulva Lactuca) biomass were investigated as a function of pH, biomass dosage, contact time, and temperature. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models were applied to describe the biosorption isotherm of the metal ions by U. Lactuca biomass. Langmuir model fitted the equilibrium data better than the Freundlich isotherm. The monolayer biosorption capacity of U. Lactuca biomass for Pb(II) and Cd(II) ions was found to be 34.7mg/g and 29.2mg/g, respectively. From the D-R isotherm model, the mean free energy was calculated as 10.4kJ/mol for Pb(II) biosorption and 9.6kJ/mol for Cd(II) biosorption, indicating that the biosorption of both metal ions was taken place by chemisorption. The calculated thermodynamic parameters (DeltaG degrees , DeltaH degrees and DeltaS degrees ) showed that the biosorption of Pb(II) and Cd(II) ions onto U. Lactuca biomass was feasible, spontaneous and exothermic under examined conditions. Experimental data were also tested in terms of biosorption kinetics using pseudo-first-order and pseudo-second-order kinetic models. The results showed that the biosorption processes of both metal ions followed well pseudo-second-order kinetics.
Alberto Penarodriguez - One of the best experts on this subject based on the ideXlab platform.
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use of seaweed ulva Lactuca for water bioremediation and as feed additive for white shrimp litopenaeus vannamei
PeerJ, 2018Co-Authors: Regina Elizondogonzalez, Eduardo Quirozguzman, Cristina Escobedofregoso, Paola Magallonservin, Alberto PenarodriguezAbstract:Two experimental feeding trials were conducted during four weeks to evaluate the use of Ulva Lactuca in shrimp culture: (1) for wastewater bioremediation, and (2) using different inclusion levels of U. Lactuca meal in shrimp feed. In feeding trial 1, shrimp reared under seaweed U. Lactuca water exchange in a re-circulation system (SWE) resulted in similar growth and feed utilization as shrimp reared with clean water exchange (CWE). Shrimp under no water exchange (NWE) resulted in significant lower growth and higher feed conversion rate (FCR) compared to the other treatments (p 0.05). In feeding trial 2, U. Lactuca biomass produced by wastewater bioremediation in SWE treatment were dried and ground to formulate diets containing 0, 1, 2, and 3% U. Lactuca meal (0UL, 1UL, 2UL, and 3UL). Shrimp fed the 3 UL diet resulted in a significant (p < 0.05) improvement of growth and FCR, and enhanced whole shrimp lipid and carotenoid content by 30 and 60%, respectively, compared to control diet. Seaweed U. Lactuca is suggested as a desirable species for wastewater bioremediation in integrated aquaculture systems, and its meal as a good feed additive for farmed shrimp.
