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Bor-yann Chen - One of the best experts on this subject based on the ideXlab platform.

  • Dose-Response Assessment Upon CO2 Tolerance of Indigenous Microalgal Isolates for Biofuel Production
    Energy Procedia, 2014
    Co-Authors: Bor-yann Chen, Chi-huan Lee, Chung-chuan Hsueh
    Abstract:

    Abstract To select optimal CO 2 -tolerant microalgal species for simultaneous renewable biodiesel production and reduction of greenhouse-gas emission, this study proposed first-attempt toxicological Assessment to screen CO 2 -utilizing microalgal isolates from natural water bodies present in highly biodiverse eastern Taiwan. With specified culture media (e.g., BG-11 medium) at different temperatures and CO 2 concentrations, the ranking of growth characteristics (μ; d -1 ) of microalgal isolates was determined (e.g., Chlorella sp. NIUs08 (0.233 d −1 ) >  Scenedesmus sp. NIUs06 (0.17 d −1 ) >  Chlorella sp. NIUs07 (0.0914 d −1 ) > strain NIUs05 (0.085 d −1 ) >  Chlorella sp. NIUs09 (0.038 d −1 )). In terms of toxicology, this study provided novel Dose-Response Assessment upon microalgal growth in Response to CO 2 -inhibitory potency, suggesting promising isolates for cost-effective applications of CO 2 reduction. Although CO 2 could be utilized as sole carbon source for microalgal growth, algal tolerance to CO 2 inevitably controls the performance of growth-associated production. Thus, this first-attempt novel Assessment quantitatively revealed the most promising CO 2 -utilizing microalgae obtained from estuarine water, in particular for renewable-bioenergy applications to high level CO 2 emission industry.

  • exploring decolorization and halotolerance characteristics by indigenous acclimatized bacteria chemical structure of azo dyes and Dose Response Assessment
    Journal of The Taiwan Institute of Chemical Engineers, 2011
    Co-Authors: Bor-yann Chen, Chung-chuan Hsueh, Wen-ming Chen
    Abstract:

    Abstract To consider the feasibility of dye bioremediation in salty wastewater, this first-attempt study explored dye decolorization and halotolerance characteristics of indigenous acclimatized bacteria. We tended to consider the aspects in chemical structure of azo dye and toxicity Assessment to investigate salt-bearing dye wastewater treatment. Meanwhile, the relationship between the chemical structure and biodegradability of the azo dye was disclosed. The Dose–Response analysis also quantitatively disclosed salt tolerance of indigenous decolorizers Staphylococcus gallinarum NIU-K1, Exiguobacterium acetylicum NIU-K2, and Exiguobacterium indicum NIU-K4. Plus, the strain NIU-K1 ranked the highest tolerance of all strains. Apparently, bacterial decolorization performance in normal and relatively salty cultures strongly affected by the chemical structure of azo dyes. When the electrophilicity of azo bonds increased and/or the steric hindrance near azo bonds became less significant, azo dye decolorization was more favorable. Plus, the ranking of the maximal specific decolorization rate of RBk5 was NIU-K2 > NIU-K4 > P11≅NIU-K1 at 60 g/L NaCl-containing cultures. Strains NIU-K2 and NIU-K4 were thus more appropriate to be decolorizers for salt-containing wastewater decolorization. This promising result suggested that the application of our acclimatization strategy to select azo dye decolorizers through natural seawater for salt-bearing dye wastewater treatment was feasible with consideration of Dose–Response Assessment.

  • Exploring decolorization and halotolerance characteristics by indigenous acclimatized bacteria: Chemical structure of azo dyes and Dose–Response Assessment
    Journal of the Taiwan Institute of Chemical Engineers, 2011
    Co-Authors: Bor-yann Chen, Chung-chuan Hsueh, Wen-ming Chen
    Abstract:

    Abstract To consider the feasibility of dye bioremediation in salty wastewater, this first-attempt study explored dye decolorization and halotolerance characteristics of indigenous acclimatized bacteria. We tended to consider the aspects in chemical structure of azo dye and toxicity Assessment to investigate salt-bearing dye wastewater treatment. Meanwhile, the relationship between the chemical structure and biodegradability of the azo dye was disclosed. The Dose–Response analysis also quantitatively disclosed salt tolerance of indigenous decolorizers Staphylococcus gallinarum NIU-K1, Exiguobacterium acetylicum NIU-K2, and Exiguobacterium indicum NIU-K4. Plus, the strain NIU-K1 ranked the highest tolerance of all strains. Apparently, bacterial decolorization performance in normal and relatively salty cultures strongly affected by the chemical structure of azo dyes. When the electrophilicity of azo bonds increased and/or the steric hindrance near azo bonds became less significant, azo dye decolorization was more favorable. Plus, the ranking of the maximal specific decolorization rate of RBk5 was NIU-K2 > NIU-K4 > P11≅NIU-K1 at 60 g/L NaCl-containing cultures. Strains NIU-K2 and NIU-K4 were thus more appropriate to be decolorizers for salt-containing wastewater decolorization. This promising result suggested that the application of our acclimatization strategy to select azo dye decolorizers through natural seawater for salt-bearing dye wastewater treatment was feasible with consideration of Dose–Response Assessment.

  • Dose Response Assessment of metal toxicity upon indigenous thiobacillus thiooxidans bc1
    Process Biochemistry, 2004
    Co-Authors: Bor-yann Chen, Hsuan-liang Liu, Yun-wen Chen, Yang-chu Cheng
    Abstract:

    Abstract This study provides a first attempt from a toxicological perspective to put forward, in general terms and explanations, the toxicity series of Cd(II), Cu(II) and Zn(II) to Thiobacillus thiooxidans BC1. Sulphur oxidation and sulphuric acid production are strongly related to microbial growth at pH less than 4. Dose–Response analysis on chronic and acute toxicity (e.g. EC 20 , median effective Dose EC 50 and slope factor B) of divalent cadmium, copper and zinc cations suggests a toxicity series of Cu>Cd>>Zn to T. thiooxidans BC1. Zn(II) is termed non-toxic and the maximum treatment concentrations of Cd(II) and Cu(II) are approximately 300, 400 mg/l, respectively. This Assessment clearly indicates viable operation ranges of metal bioleaching for mine wastewater treatment, suggesting a technological feasibility of biotreatment using acidophilic thiobacilli T. thiooxidans BC1.

  • Dose–Response Assessment of metal toxicity upon indigenous Thiobacillus thiooxidans BC1
    Process Biochemistry, 2004
    Co-Authors: Bor-yann Chen, Hsuan-liang Liu, Yun-wen Chen, Yang-chu Cheng
    Abstract:

    Abstract This study provides a first attempt from a toxicological perspective to put forward, in general terms and explanations, the toxicity series of Cd(II), Cu(II) and Zn(II) to Thiobacillus thiooxidans BC1. Sulphur oxidation and sulphuric acid production are strongly related to microbial growth at pH less than 4. Dose–Response analysis on chronic and acute toxicity (e.g. EC 20 , median effective Dose EC 50 and slope factor B) of divalent cadmium, copper and zinc cations suggests a toxicity series of Cu>Cd>>Zn to T. thiooxidans BC1. Zn(II) is termed non-toxic and the maximum treatment concentrations of Cd(II) and Cu(II) are approximately 300, 400 mg/l, respectively. This Assessment clearly indicates viable operation ranges of metal bioleaching for mine wastewater treatment, suggesting a technological feasibility of biotreatment using acidophilic thiobacilli T. thiooxidans BC1.

Yang-chu Cheng - One of the best experts on this subject based on the ideXlab platform.

  • Dose Response Assessment of metal toxicity upon indigenous thiobacillus thiooxidans bc1
    Process Biochemistry, 2004
    Co-Authors: Bor-yann Chen, Hsuan-liang Liu, Yun-wen Chen, Yang-chu Cheng
    Abstract:

    Abstract This study provides a first attempt from a toxicological perspective to put forward, in general terms and explanations, the toxicity series of Cd(II), Cu(II) and Zn(II) to Thiobacillus thiooxidans BC1. Sulphur oxidation and sulphuric acid production are strongly related to microbial growth at pH less than 4. Dose–Response analysis on chronic and acute toxicity (e.g. EC 20 , median effective Dose EC 50 and slope factor B) of divalent cadmium, copper and zinc cations suggests a toxicity series of Cu>Cd>>Zn to T. thiooxidans BC1. Zn(II) is termed non-toxic and the maximum treatment concentrations of Cd(II) and Cu(II) are approximately 300, 400 mg/l, respectively. This Assessment clearly indicates viable operation ranges of metal bioleaching for mine wastewater treatment, suggesting a technological feasibility of biotreatment using acidophilic thiobacilli T. thiooxidans BC1.

  • Dose–Response Assessment of metal toxicity upon indigenous Thiobacillus thiooxidans BC1
    Process Biochemistry, 2004
    Co-Authors: Bor-yann Chen, Hsuan-liang Liu, Yun-wen Chen, Yang-chu Cheng
    Abstract:

    Abstract This study provides a first attempt from a toxicological perspective to put forward, in general terms and explanations, the toxicity series of Cd(II), Cu(II) and Zn(II) to Thiobacillus thiooxidans BC1. Sulphur oxidation and sulphuric acid production are strongly related to microbial growth at pH less than 4. Dose–Response analysis on chronic and acute toxicity (e.g. EC 20 , median effective Dose EC 50 and slope factor B) of divalent cadmium, copper and zinc cations suggests a toxicity series of Cu>Cd>>Zn to T. thiooxidans BC1. Zn(II) is termed non-toxic and the maximum treatment concentrations of Cd(II) and Cu(II) are approximately 300, 400 mg/l, respectively. This Assessment clearly indicates viable operation ranges of metal bioleaching for mine wastewater treatment, suggesting a technological feasibility of biotreatment using acidophilic thiobacilli T. thiooxidans BC1.

Linda K Teuschler - One of the best experts on this subject based on the ideXlab platform.

  • Evaluating quantitative formulas for Dose-Response Assessment of chemical mixtures.
    Environmental Health Perspectives, 2002
    Co-Authors: Richard C Hertzberg, Linda K Teuschler
    Abstract:

    Risk Assessment formulas are often distinguished from Dose-Response models by being rough but necessary. The evaluation of these rough formulas is described here, using the example of mixture risk ...

  • Evaluating quantitative formulas for Dose-Response Assessment of chemical mixtures.
    Environmental health perspectives, 2002
    Co-Authors: Richard C Hertzberg, Linda K Teuschler
    Abstract:

    Risk Assessment formulas are often distinguished from Dose-Response models by being rough but necessary. The evaluation of these rough formulas is described here, using the example of mixture risk Assessment. Two conditions make the Dose-Response part of mixture risk Assessment difficult, lack of data on mixture Dose-Response relationships, and the need to address risk from combinations of chemicals because of public demands and statutory requirements. Consequently, the U.S. Environmental Protection Agency has developed methods for carrying out quantitative Dose-Response Assessment for chemical mixtures that require information only on the toxicity of single chemicals and of chemical pair interactions. These formulas are based on plausible ideas and default parameters but minimal supporting data on whole mixtures. Because of this lack of mixture data, the usual evaluation of accuracy (predicted vs. observed) cannot be performed. Two approaches to the evaluation of such formulas are to consider fundamental biological concepts that support the quantitative formulas (e.g., toxicologic similarity) and to determine how well the proposed method performs under simplifying constraints (e.g., as the toxicologic interactions disappear). These ideas are illustrated using Dose addition and two weight-of-evidence formulas for incorporating toxicologic interactions.

Hsuan-liang Liu - One of the best experts on this subject based on the ideXlab platform.

  • Dose Response Assessment of metal toxicity upon indigenous thiobacillus thiooxidans bc1
    Process Biochemistry, 2004
    Co-Authors: Bor-yann Chen, Hsuan-liang Liu, Yun-wen Chen, Yang-chu Cheng
    Abstract:

    Abstract This study provides a first attempt from a toxicological perspective to put forward, in general terms and explanations, the toxicity series of Cd(II), Cu(II) and Zn(II) to Thiobacillus thiooxidans BC1. Sulphur oxidation and sulphuric acid production are strongly related to microbial growth at pH less than 4. Dose–Response analysis on chronic and acute toxicity (e.g. EC 20 , median effective Dose EC 50 and slope factor B) of divalent cadmium, copper and zinc cations suggests a toxicity series of Cu>Cd>>Zn to T. thiooxidans BC1. Zn(II) is termed non-toxic and the maximum treatment concentrations of Cd(II) and Cu(II) are approximately 300, 400 mg/l, respectively. This Assessment clearly indicates viable operation ranges of metal bioleaching for mine wastewater treatment, suggesting a technological feasibility of biotreatment using acidophilic thiobacilli T. thiooxidans BC1.

  • Dose–Response Assessment of metal toxicity upon indigenous Thiobacillus thiooxidans BC1
    Process Biochemistry, 2004
    Co-Authors: Bor-yann Chen, Hsuan-liang Liu, Yun-wen Chen, Yang-chu Cheng
    Abstract:

    Abstract This study provides a first attempt from a toxicological perspective to put forward, in general terms and explanations, the toxicity series of Cd(II), Cu(II) and Zn(II) to Thiobacillus thiooxidans BC1. Sulphur oxidation and sulphuric acid production are strongly related to microbial growth at pH less than 4. Dose–Response analysis on chronic and acute toxicity (e.g. EC 20 , median effective Dose EC 50 and slope factor B) of divalent cadmium, copper and zinc cations suggests a toxicity series of Cu>Cd>>Zn to T. thiooxidans BC1. Zn(II) is termed non-toxic and the maximum treatment concentrations of Cd(II) and Cu(II) are approximately 300, 400 mg/l, respectively. This Assessment clearly indicates viable operation ranges of metal bioleaching for mine wastewater treatment, suggesting a technological feasibility of biotreatment using acidophilic thiobacilli T. thiooxidans BC1.

Yun-wen Chen - One of the best experts on this subject based on the ideXlab platform.

  • Dose Response Assessment of metal toxicity upon indigenous thiobacillus thiooxidans bc1
    Process Biochemistry, 2004
    Co-Authors: Bor-yann Chen, Hsuan-liang Liu, Yun-wen Chen, Yang-chu Cheng
    Abstract:

    Abstract This study provides a first attempt from a toxicological perspective to put forward, in general terms and explanations, the toxicity series of Cd(II), Cu(II) and Zn(II) to Thiobacillus thiooxidans BC1. Sulphur oxidation and sulphuric acid production are strongly related to microbial growth at pH less than 4. Dose–Response analysis on chronic and acute toxicity (e.g. EC 20 , median effective Dose EC 50 and slope factor B) of divalent cadmium, copper and zinc cations suggests a toxicity series of Cu>Cd>>Zn to T. thiooxidans BC1. Zn(II) is termed non-toxic and the maximum treatment concentrations of Cd(II) and Cu(II) are approximately 300, 400 mg/l, respectively. This Assessment clearly indicates viable operation ranges of metal bioleaching for mine wastewater treatment, suggesting a technological feasibility of biotreatment using acidophilic thiobacilli T. thiooxidans BC1.

  • Dose–Response Assessment of metal toxicity upon indigenous Thiobacillus thiooxidans BC1
    Process Biochemistry, 2004
    Co-Authors: Bor-yann Chen, Hsuan-liang Liu, Yun-wen Chen, Yang-chu Cheng
    Abstract:

    Abstract This study provides a first attempt from a toxicological perspective to put forward, in general terms and explanations, the toxicity series of Cd(II), Cu(II) and Zn(II) to Thiobacillus thiooxidans BC1. Sulphur oxidation and sulphuric acid production are strongly related to microbial growth at pH less than 4. Dose–Response analysis on chronic and acute toxicity (e.g. EC 20 , median effective Dose EC 50 and slope factor B) of divalent cadmium, copper and zinc cations suggests a toxicity series of Cu>Cd>>Zn to T. thiooxidans BC1. Zn(II) is termed non-toxic and the maximum treatment concentrations of Cd(II) and Cu(II) are approximately 300, 400 mg/l, respectively. This Assessment clearly indicates viable operation ranges of metal bioleaching for mine wastewater treatment, suggesting a technological feasibility of biotreatment using acidophilic thiobacilli T. thiooxidans BC1.