The Experts below are selected from a list of 21627 Experts worldwide ranked by ideXlab platform

Jadranka Travassejdic - One of the best experts on this subject based on the ideXlab platform.

  • dna hybridization detection with blue luminescent quantum dots and dye labeled single stranded dna
    Journal of the American Chemical Society, 2007
    Co-Authors: Hui Peng, Lijuan Zhang, Tanja H M Kjallman, Christian Soeller, Jadranka Travassejdic
    Abstract:

    A simple DNA sensing platform was developed based on the fluorescence resonance energy transfer (FRET) between blue-luminescent CdTe QDs and dye-labeled ssDNA. A Cationic Polymer acts as a “bridge” to bring the donor to acceptor together and achieves the high FRET efficiency. The hybridization event was recognized by the different FRET efficiencies due to different interaction abilities of single-stranded and double-stranded DNA with the Polymer. This platform provides a homogeneous DNA assay that takes advantage of the fluorescence detection method, but with minimal DNA modification.

  • dna hybridization detection with blue luminescent quantum dots and dye labeled single stranded dna
    Journal of the American Chemical Society, 2007
    Co-Authors: Hui Peng, Lijuan Zhang, Tanja H M Kjallman, Christian Soeller, Jadranka Travassejdic
    Abstract:

    A simple DNA sensing platform was developed based on the fluorescence resonance energy transfer (FRET) between blue-luminescent CdTe QDs and dye-labeled ssDNA. A Cationic Polymer acts as a “bridge” to bring the donor to acceptor together and achieves the high FRET efficiency. The hybridization event was recognized by the different FRET efficiencies due to different interaction abilities of single-stranded and double-stranded DNA with the Polymer. This platform provides a homogeneous DNA assay that takes advantage of the fluorescence detection method, but with minimal DNA modification.

Hui Peng - One of the best experts on this subject based on the ideXlab platform.

  • dna hybridization detection with blue luminescent quantum dots and dye labeled single stranded dna
    Journal of the American Chemical Society, 2007
    Co-Authors: Hui Peng, Lijuan Zhang, Tanja H M Kjallman, Christian Soeller, Jadranka Travassejdic
    Abstract:

    A simple DNA sensing platform was developed based on the fluorescence resonance energy transfer (FRET) between blue-luminescent CdTe QDs and dye-labeled ssDNA. A Cationic Polymer acts as a “bridge” to bring the donor to acceptor together and achieves the high FRET efficiency. The hybridization event was recognized by the different FRET efficiencies due to different interaction abilities of single-stranded and double-stranded DNA with the Polymer. This platform provides a homogeneous DNA assay that takes advantage of the fluorescence detection method, but with minimal DNA modification.

  • dna hybridization detection with blue luminescent quantum dots and dye labeled single stranded dna
    Journal of the American Chemical Society, 2007
    Co-Authors: Hui Peng, Lijuan Zhang, Tanja H M Kjallman, Christian Soeller, Jadranka Travassejdic
    Abstract:

    A simple DNA sensing platform was developed based on the fluorescence resonance energy transfer (FRET) between blue-luminescent CdTe QDs and dye-labeled ssDNA. A Cationic Polymer acts as a “bridge” to bring the donor to acceptor together and achieves the high FRET efficiency. The hybridization event was recognized by the different FRET efficiencies due to different interaction abilities of single-stranded and double-stranded DNA with the Polymer. This platform provides a homogeneous DNA assay that takes advantage of the fluorescence detection method, but with minimal DNA modification.

Baoyu Gao - One of the best experts on this subject based on the ideXlab platform.

  • a comparative study on the properties mechanisms and process designs for the adsorption of non ionic or anionic dyes onto Cationic Polymer bentonite
    Journal of Environmental Management, 2010
    Co-Authors: Qinyan Yue, Hongjian Sun, Baoyu Gao
    Abstract:

    The adsorption properties and mechanisms of a Cationic-Polymer/bentonite complex (EPI-DMA/bentonite), prepared from polyepicholorohydrin-dimethylamine and bentonite, for non-ionic dyes (Disperse Blue SBL and Vat Scarlet R) and anionic dyes (Reactive Violet K-3R and Acid Dark Blue 2G) were investigated in this study. The solution pH, presence of salt and surfactant can significantly affect the dye removal efficiency. The equilibrium data were analyzed using the Langmuir and Freundlich models. The Langmuir model is the most suitable to describe non-ionic dye adsorption, but for anionic dyes the Freundlich model is best. The kinetic data for the adsorption of different dyes were analyzed using pseudo first- and second-order equations, and the experimental data conformed to the pseudo second-order kinetic model better. The possibility of intraparticle diffusion was also examined by using the intraparticle diffusion equation. The single-stage batch adsorber design for the adsorption of both types of dyes onto EPI-DMA/bentonite was studied based on the Langmuir isotherm model for non-ionic dyes and the Freundlich isotherm model for anionic dyes. The results showed that the required amount of EPI-DMA/bentonite for 95% dye removal in 5 L dye solution with a concentration of 50 mg/L is 378.0 g for DB SBL, 126.5 g for VS R, 9.7 g for RV K-3R and 15.5 g for ADB 2G.

  • equilibrium thermodynamics and process design to minimize adsorbent amount for the adsorption of acid dyes onto Cationic Polymer loaded bentonite
    Chemical Engineering Journal, 2010
    Co-Authors: Qinyan Yue, Baoyu Gao, Hongjian Sun
    Abstract:

    The adsorption equilibrium, thermodynamics and process design of the polyepicholorohydrin-dimethylamine (EPI-DMA) Cationic Polymer-loaded bentonite (EPI-DMA/bentonite) for the removal of two acid dyes (Acid Scarlet GR and Acid Dark Blue 2G) were studied to assess the adsorption capacities, mechanisms and the minimum adsorbent amount. The effects of solution pH and salt concentration on the removal of acid dye were also investigated. The equilibrium data were analyzed by the Langmuir and Freundlich model, which revealed that Freundlich model was more suitable to describe the acid dyes adsorption than Langmuir model. According to the dependence of thermodynamic equilibrium constant (Ks) on temperatures, the thermodynamic parameters associated with the adsorption process were calculated. The negative values of ΔG0 indicate that the overall adsorption processes are spontaneous. And the positive values of ΔH0 show that the adsorption processes are endothermic in nature and the adsorption mechanisms are between physical adsorption and chemisorption. Based on the well correlated adsorption isotherm, an adsorption process design model has been developed for the design of a two-stage batch adsorber to predict the minimum amount of adsorbent to achieve a specified percentage of dye removal. Results show that compared with the single-stage batch adsorption, the two-stage process can significantly save adsorbent to meet the needs for higher dye removal efficiency (>99%) and therefore minimize capital investment costs.

  • two step kinetic study on the adsorption and desorption of reactive dyes at Cationic Polymer bentonite
    Journal of Hazardous Materials, 2009
    Co-Authors: Qinyan Yue, Baoyu Gao
    Abstract:

    Abstract The adsorption kinetics of two reactive dyes, namely, Reactive Blue K-GL and Reactive Yellow K-4G onto the new Cationic Polymer/bentonite, i.e., polyepicholorohydrin-dimethylamine/bentonite (EPI-DMA/bentonite), were studied under different conditions. The result indicated that the adsorption processes were found to follow the two-step kinetic rate equation with two different adsorption rate constants ( k 1 and k 2 ) and also to follow the intraparticle diffusion model with two different diffusion rate constants ( k int,1 and k int,2 ). The corresponding values of energies of activation of adsorption, enthalpies of activation and entropies of activation for both the two adsorption kinetic steps have been calculated, suggesting that the adsorption processes were endothermic and physical. The desorption kinetics of two dyes from EPI-DMA/bentonite were studied in NaOH solution with different concentrations, which were also found to obey the two-step kinetic rate equation with two different desorption rate constants ( k d ,1 and k d ,2 ).

  • kinetics of adsorption of disperse dyes by polyepicholorohydrin dimethylamine Cationic Polymer bentonite
    Separation and Purification Technology, 2007
    Co-Authors: Qinyan Yue, Baoyu Gao, Yan Wang
    Abstract:

    Abstract The characterization of polyepicholorohydrin-dimethylamine/bentonite and the kinetics of adsorption of four disperse dyes, namely, Disperse Yellow Brown S-2RFL (DYB S-2RFL), Disperse Red S-R (DR S-R), Disperse Blue SBL (DB SBL) and Disperse Yellow (DY SE-6GFL) onto organophilic bentonite (polyepicholorohydrin-dimethylamine/bentonite) have been studied at various solution concentrations and temperatures. The adsorption kinetics was studied in terms of a two-step first-order kinetic rate equation and intra-particle diffusion model. The adsorption process has been found to follow with two different rate constants ( k 1 and k 2 ) for two-step first-order kinetic rate equation and also two different intra-particle diffusion rate constants ( k int1 and k int2 ) for intra-particle diffusion model. For both the kinetic steps, the energies of activation of adsorption ( E a1 and E a2 ) and other thermodynamic parameters ( Δ H 1 * and Δ H 2 * , Δ S 1 * and Δ S 2 * , Δ G 1 * and Δ G 2 * ) have been calculated using Arrhenius's and Eyring's equation, respectively. It has been found that for both the adsorption kinetic steps, E a1 and E a2 are corresponding to the values of k 1 and k 2 and Δ H 1 * − T av Δ S 1 * , Δ H 2 * − T av Δ S 2 * and Δ G *  > 0, which means that the influence of entropy is more remarkable than enthalpy in activation reaction and the adsorption process is not spontaneous.

Christian Soeller - One of the best experts on this subject based on the ideXlab platform.

  • dna hybridization detection with blue luminescent quantum dots and dye labeled single stranded dna
    Journal of the American Chemical Society, 2007
    Co-Authors: Hui Peng, Lijuan Zhang, Tanja H M Kjallman, Christian Soeller, Jadranka Travassejdic
    Abstract:

    A simple DNA sensing platform was developed based on the fluorescence resonance energy transfer (FRET) between blue-luminescent CdTe QDs and dye-labeled ssDNA. A Cationic Polymer acts as a “bridge” to bring the donor to acceptor together and achieves the high FRET efficiency. The hybridization event was recognized by the different FRET efficiencies due to different interaction abilities of single-stranded and double-stranded DNA with the Polymer. This platform provides a homogeneous DNA assay that takes advantage of the fluorescence detection method, but with minimal DNA modification.

  • dna hybridization detection with blue luminescent quantum dots and dye labeled single stranded dna
    Journal of the American Chemical Society, 2007
    Co-Authors: Hui Peng, Lijuan Zhang, Tanja H M Kjallman, Christian Soeller, Jadranka Travassejdic
    Abstract:

    A simple DNA sensing platform was developed based on the fluorescence resonance energy transfer (FRET) between blue-luminescent CdTe QDs and dye-labeled ssDNA. A Cationic Polymer acts as a “bridge” to bring the donor to acceptor together and achieves the high FRET efficiency. The hybridization event was recognized by the different FRET efficiencies due to different interaction abilities of single-stranded and double-stranded DNA with the Polymer. This platform provides a homogeneous DNA assay that takes advantage of the fluorescence detection method, but with minimal DNA modification.

Lijuan Zhang - One of the best experts on this subject based on the ideXlab platform.

  • dna hybridization detection with blue luminescent quantum dots and dye labeled single stranded dna
    Journal of the American Chemical Society, 2007
    Co-Authors: Hui Peng, Lijuan Zhang, Tanja H M Kjallman, Christian Soeller, Jadranka Travassejdic
    Abstract:

    A simple DNA sensing platform was developed based on the fluorescence resonance energy transfer (FRET) between blue-luminescent CdTe QDs and dye-labeled ssDNA. A Cationic Polymer acts as a “bridge” to bring the donor to acceptor together and achieves the high FRET efficiency. The hybridization event was recognized by the different FRET efficiencies due to different interaction abilities of single-stranded and double-stranded DNA with the Polymer. This platform provides a homogeneous DNA assay that takes advantage of the fluorescence detection method, but with minimal DNA modification.

  • dna hybridization detection with blue luminescent quantum dots and dye labeled single stranded dna
    Journal of the American Chemical Society, 2007
    Co-Authors: Hui Peng, Lijuan Zhang, Tanja H M Kjallman, Christian Soeller, Jadranka Travassejdic
    Abstract:

    A simple DNA sensing platform was developed based on the fluorescence resonance energy transfer (FRET) between blue-luminescent CdTe QDs and dye-labeled ssDNA. A Cationic Polymer acts as a “bridge” to bring the donor to acceptor together and achieves the high FRET efficiency. The hybridization event was recognized by the different FRET efficiencies due to different interaction abilities of single-stranded and double-stranded DNA with the Polymer. This platform provides a homogeneous DNA assay that takes advantage of the fluorescence detection method, but with minimal DNA modification.