Prof. Ching-Hua Huang, Environmental Engineering

Journal Articles:

  1. Park, S. H.; Piyachaturawat, P.; Taylor, A. E.; Huang, C.-H. 2009. Potential N-Nitrosodimethylamine (NDMA) Formation from Amine-based Water Treatment Polymers in the Reactions with Chlorine-based Oxidants and Nitrosifying Agents, Water Science & Technology, submitted.
  2. Padhye, L.; Tezel, U.; Mitch, W. A.; Pavlostathis, S. G.; Huang, C.-H. 2009. Occurrence and Fate of Nitrosamines and Their Precursors in Municipal Sludge and Anaerobic Digestion Systems, Environmental Science & Technology, in press.
  3. Miyashita, Y.; Park, S. H.; Hyung, H.; Huang, C.-H.; Kim, J. H. 2009. Removal of N-Nitrosamines and Their Precursors by Nanofiltration and Reverse Osmosis Membranes, Journal of Environmental Engineering, in press.
  4. Park, S. H.; Wei, S.; Mizaikoff, B.; Taylor, A. E.; Favero, C.; Huang, C.-H. 2009. Degradation of Amine-based Water Treatment Polymers during Chloramination as N-Nitrosodimethylamine (NDMA) Precursors. Environmental Science & Technology, 43(5), 1360-1366.
  5. Chen, W.-R.; Huang, C.-H. 2009. Transformation of Tetracyclines Mediated by Mn(II) and Cu(II) Ions in the Presence of Oxygen. Environmental Science & Technology, 43, 401-407. (Article/SI)
  6. Zhang, B.; Cho, M.; Fortner, J. D.; Lee, J.; Huang, C.-H.; Hughes, J. B.; Kim, J.-H. 2009. Delineating Oxidative Processes of Aqueous C60 Preparations. Environmental Science & Technology, 43, 108-113. (Article/SI)
  7. Zhang, H.; Chen, W.-R.; Huang, C.-H. 2008. Kinetic Modeling of the Oxidation of Antibacterial Agents by Manganese Oxides. Environmental Science & Technology, 42, 5548-5554. (Article/SI)
  8. McCallum, E. A.; Hyung, H.; Do, T. A.; Huang, C.-H.; Kim, J. H. 2008. Adsorption, Desorption, and Steady-State Removal of 17b-Estradiol by Nanofiltration Membranes, Journal of Membrane Science, 319, 38-43. (Article)
  9. Lee, S. J.; Shian, S.; Huang, C.-H.; Sandhage, K. H. 2007. Rapid Hydrolysis of Organophosphorous Esters Induced by Nanostructured, Fluorine-doped Titania Replicas of Diatom Frustules, Journal of the American Ceramic Society, 90[5], 1632-1636. (Article)
  10. Dodd, M. C.; Huang, C.-H. 2007. Aqueous Chlorination of the Antibacterial Agent Trimethoprim: Reaction Kinetics and Pathways, Water Research, 41, 647-655. (Article/SI)
  11. Zhang, H.; Huang, C.-H. 2007. Adsorption and Oxidation of Fluoroquinolone Antibacterial Agents and Structurally Related Amines in the Presence of Goethite, Chemosphere, 66(8), 1502-1512. (Article/SI)
  12. Shah, A. D.; Kim, J. H.; Huang, C.-H. 2006. Reaction Kinetics and Transformation of Carbadox and Structurally Related Compounds with Aqueous Chlorine, Environmental Science & Technology, 40, 7228-7235. (Article/SI)
  13. Dodd, M. C.; Shah, A. D.; von Gunten, U.; Huang, C.-H. 2005. Reactions of Fluoroquinolone Antibacterial Agents with Chlorine. Kinetics, Mechanisms, and Pathways, Environmental Science & Technology, 39, 7065-7076. (Article/SI)
  14. Zhang, H.; Huang, C.-H. 2005. Oxidative Transformation of Fluoroquinolone Antibacterial Agents and Structurally Related Amines with Manganese Oxide, Environmental Science & Technology, 39, 4474-4483. (Article/SI)
  15. Zhang, H.; Huang, C.-H. 2005. Reactivity and Transformation of Antibacterial N-Oxides in the Presence of Manganese Oxide, Environmental Science & Technology, 39, 593-601. (Article/SI)
  16. Dodd, M. C.; Huang, C.-H. 2004. Transformation of the Antibacterial Agent Sulfamethoxazole in Reactions with Chlorine. Kinetics, Mechanisms, and Pathways, Environmental Science & Technology, 38, 5607-5615. (Article/SI)
  17. Renew, J. E.; Huang, C.-H. 2004. Simultaneous Analysis of Fluoroquinolone, Sulfonamide and Trimethoprim Antibiotics in Wastewater using Tandem Solid-Phase Extraction and Liquid Chromatography Electrospray Mass Spectrometry, Journal of Chromatography A, 1042, 113-121. (Article)
  18. Zhang, H.; Huang, C.-H. 2003. Oxidative Transformation of Triclosan and Chlorophene by Manganese Oxides, Environmental Science & Technology, 37, 2421-2430. (Article/SI)
  19. Huang, C.-H.; Stone, A. T. 2003. Transformation of the Plant Growth Regulator Daminozide (Alar) and Structurally-Related Compounds with Cu(II) Ions: Oxidation versus Hydrolysis, Environmental Science & Technology, 37, 1829-1837. (Article/SI)
  20. Huang, C.-H.; Sedlak, D. L. 2001. Analysis of Estrogenic Hormones in Municipal Wastewater Effluent and Surface Water Using Enzyme-Linked Immunosorbent Assays (ELISAs) and Gas Chromatography Tandem Mass Spectrometry, Environmental Toxicology & Chemistry, 20, 133-139. (Article)
  21. Huang, C.-H. and Stone, A. T. 2000. Synergistic Catalysis of Dimetilan Hydrolysis by Metal Ions and Organic Ligands, Environmental Science & Technology, 34, 4117-4122. (Article)
  22. Huang, C.-H.; Stone, A. T. 1999. Hydrolysis of Naptalam and Structurally-Related Amides. Inhibition by Dissolved Metal Ions and Metal (Hydr)Oxide Surfaces, Journal of Agricultural & Food Chemistry, 47(10), 4425-4434. (Article)

 

Book Chapters:

1.      Huang, C.-H., Dodd, M. C. and Shah, A. D. 2008. Reactions of Antibacterial Agents with Aqueous Chlorine under Water Treatment Relevant Conditions, in Fate of Pharmaceuticals in the Environment and in Water Treatment Systems, edited by D. Aga, CRC Press, Taylor & Francis Books, Boca Raton, FL, p. 261-290.

2.      Sedlak, D. L., Huang, C.-H. and Pinkston, K. 2004. Strategies for Selecting Pharmaceuticals to Assess Attenuation during Indirect Potable Water Reuse, in Pharmaceuticals in the Environment – Sources, Fate, Effects and Risks, 2nd Edition; Editor: Klaus Kümmerer, Springer Verlag, p. 107-118.

 

Conference Proceedings:

1.      Shah, A. D.; Huang, C.-H.; Kim, J.-H. Modeling Rejection of Select Antibiotics by Nanofiltration Membranes under Varying Water Quality Conditions. Proceedings of AWWA Annual Conference, Atlanta, GA, June 8-12, 2008.

2.      Miyashita, Y.; Park, S. H.; Hyung, H.; Park, S. H.; Huang, C.-H.; Kim, J.-H. Removal of N-Nitrosamines and Their Precursors by Nanofiltration and Reverse Osmosis Membranes. Proceedings of AWWA Annual Conference, Atlanta, GA, June 8-12, 2008.

3.      Shah, A. D, Kim, J. H. and Huang, C.-H. Enhanced Chlorination and Disinfection By-Product Formation of Organic Contaminants by Tertiary Amines. Extended abstract of the 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008.

4.      Zhang, B.; Fortner, J. D., Lee, J. S.; Huang, C.-H.; Kim, J. H.; Hughes, J. B. 2008. Catalytic Degradation of Indigo Dye by Aqueous Stable C60 Aggregates. Extended abstract of the 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008.

5.      Shah, A. D., Kim, J. H. and Huang, C.-H. Reaction Kinetics and Transformation of Carbadox and Structurally Related Compounds With Aqueous Chlorine. Extended abstract of the 233rd ACS National Meeting, Chicago, IL, March 25-29, 2007.

6.      Chen, W.-R. and Huang, C.-H. Effect of Manganese and Cupper on the Transformation of Tetracycline. Extended abstract of the 233rd ACS National Meeting, Chicago, IL, March 25-29, 2007.

7.      Park, S. H., Wei, S., Mizaikoff, B., Taylor, A. E., Aral, M. and Huang, C.-H. Mechanistic Insight for the N-Nirosodimethylamine (NDMA) Formation Potential of Amine-based Water Treatment Polymers. Extended abstract of the 233rd ACS National Meeting, Chicago, IL, March 25-29, 2007.

8.      Shah, A. D., Huang, C.-H. and Kim, J.-H. Effect of Varying Water Quality Conditions on Rejection of Selected Antibiotics by Nanofiltration Membranes. Proceedings of Membrane Technology Conference, Tampa, FL, March 18-21, 2007.

9.      Miyashita, Y., Lee, J.-Y., Hyung, Park, S. H., H., Huang, C.-H. and Kim, J.-H. Removal of N-Nitrosamines by Nanofiltration and Reverse Osmosis Membranes. Proceedings of Membrane Technology Conference, Tampa, FL, March 18-21, 2007.

10.  Chen, W. R. and Huang, C.-H. Metal Ion-Catalyzed Transformation of Tetracycline Antibiotics. Extended abstract accepted by the 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006.

11.  Shah, A. D., McCallum, E., Do, A. T. Hyung, H., Huang, C.-H. and Kim, J.-H. Rejection of Hormones and Selected Human and Veterinary Antibiotics by Nanofiltration Membranes. Proceedings of the AWWA Annual Conference & Exposition, San Antonio, TX, June 11-15, 2006.

12.  Chen, W. R. and Huang, C.-H. Effect of Surface and Dissolved Manganese on the Transformation of Tetracycline Antibiotics. Extended abstract of the 231st ACS National Meeting, Atlanta, GA, March 26-30, 2006.

13.  Lee, S. J., Huang, C.-H., Shian, S. and Sandhage, K. H. Factors Influencing the Catalytic Activity of Biologically-Derived 3-D Titania Nanoparticle Assemblies for the Hydrolysis of Chemical Agents. Extended abstract of the 231st ACS National Meeting, Atlanta, GA, March 26-30, 2006.

14.  Shah, A. D., Kim, J.-H. and Huang, C.-H. Reactions of Quinoxaline N,N’-Dioxide Antibacterial Agents with Free and Combined Chlorine. Proceedings of the Water Quality Technology Conference (WQTC), Quebec City, Quebec, Canada, November 6-10, 2005.

15.  Shah, A. D., Kim, J.-H. and Huang, C.-H. The Fate and Transformation of Quinoxaline N’N’-Dioxide Antibacterial Agents during Chlorination. WIT Transactions on Ecology and the Environment, 85(Environmental Exposure and Health), 111-118, 2005.

16.  Park, S., Piyachaturawat, P. and Huang, C.-H. Potential Enhanced Pathways for N-Nirosodimethylamine (NDMA) Formation under Water Treatment Conditions. WIT Transactions on Ecology and the Environment, 85(Environmental Exposure and Health), 101-109, 2005.  

17.  Shah, A. D., McCallum, E., Hoon, H., Huang, C.-H., and Kim, J.-H. Removal of Emerging Trace Contaminants by Nanofiltration Membranes. Proceedings of the 1st International Conference on Environmental Exposure and Health, Atlanta, GA, October 5-7, 2005.

18.  Huang, C.-H., Lee, S. J., Shian, S. and Sandhage, K. H. Novel Nanostructured Anatase Assemblies from Algae as Strong Catalysts for the Hydrolysis of Organophosphorous Esters. Extended abstract of the 230th ACS National Meeting, Washington, DC, August 28-September 1, 2005.

19.  Shah, A. D., McCallum, E., Park, A., Huang, C.-H., and Kim, J.-H. Effect of Water Quality on Rejection of Selected Human and Veterinary Antibiotics by Nanofiltration and Reverse Osmosis Membranes. Proceedings of Membrane Technology Conference, Phoenix, AZ, March 6-9, 2005.

20.  McCallum, E., Shah, A. D., Park, A., Huang, C.-H., and Kim, J.-H. Removal of Hormones by Nanofiltration Membranes: Effects of Hormone Concentration and Natural Organic Matter Fouling on Removal Efficiency. Proceedings of Membrane Technology Conference, Phoenix, AZ, March 6-9, 2005.

21.  Zhang, H.; Huang, C.-H. Reactivity and Transformation of Aromatic N-Oxides in the Presence of Manganese Dioxide. Extended abstract of the 228th ACS National Meeting, Philadelphia, PA, August 23-27, 2004.

22.  Dodd, M. C.; Huang, C.-H. Chemical Oxidation of Aquatic Antibiotic Microcontaminants by Free and Combined Chlorine. Proceedings of Water Quality Technology Conference, Philadelphia, PA, November 2-5, 2003.

23.  Huang, C.-H.; Zhang, H. Oxidation of Fluoroquinolone Antibacterials and Structurally Related Amines with Manganese Oxide. Extended abstract of the 226th ACS National Meeting, New York, NY, September 7-11, 2003.

24.  Zhang, H.; Huang, C.-H. Manganese Oxide-Facilitated Oxidative Transformation of Antibacterial Agents. Proceedings of the 3rd International Conference on Pharmaceuticals and Endocrine Disrupting Chemicals in Water, National Ground Water Association, Minneapolis, MN, March 19-21, 2003.

25.  Huang, C.-H.; Smeby, K. L.; Renew, J. E. Occurrence and Behavior of Fluoroquinolone and Sulfonamide Antibacterial Agents during Municipal Wastewater Treatment. Proceedings of Endocrine Disruptors and the Water Industry Symposium, American Water Works Association, Cincinnati, OH, April 18-20, 2002.

26.  Huang, C.-H.; Zhang, H. Oxidation of Triclosan by Manganese Oxides. Extended abstract of the 223rd ACS National Meeting, Orlando, FL, April, 2002.

27.  Huang, C.-H.; Smeby, K. L.; Renew, J. E. Occurrence and Behavior of Fluoroquinolone and Sulfonamide Antibacterial Agents during Municipal Wastewater Treatment. Extended abstract of the ACS National Meeting, Orlando, FL, April, 2002.

28.  Huang, C.-H.; Renew, J. E.; Pinkston, K.; Sedlak, D. L. Occurrence and Fate of Antibiotic Compounds in Municipal Wastewater and Animal Waste. Proceedings of the 74th Water Environment Federation Annual Conference & Exposition (WEFTEC), Atlanta, GA, October 13-17, 2001.

29.  Huang, C.-H.; Renew, J. E.; Smeby, K. L.; Pinkston, K.; Sedlak, D. L. Assessment of Potential Antibiotic Contaminants in Water and Preliminary Occurrence Analysis. Water Resources Update, 120:30-40, 2001.

30.  Huang, C.-H.; Sedlak, D. L. Analysis of Estrogenic Hormones in Municipal Wastewater Effluent and Surface Water Using ELISA and GC/MS/MS. Extended abstract of the 219th ACS National Meeting, San Francisco, CA, April, 2000.

31.  Huang, C.-H.; Stone, A. T. CuII-Catalyzed Hydrolysis of the Plant Growth Regulator Daminozide (Alar) and Structurally-Related Compounds: A Study Employing Capillary Electrophoresis. Extended abstract of the 214th ACS National Meeting, Division of Environmental Chemistry, Student Award Symposium, Las Vegas, NV, October, 1997.

32.  Huang, C.-H.; Stone, A. T. Effect of Ligands on Metal-Catalyzed Hydrolysis of Agrochemicals. Extended abstract of the 213th ACS National Meeting, Division of Environmental Chemistry, San Francisco, CA, April 13-17, 1997.

33.  Huang, C.-H.; Stone, A. T. Effect of Metal Ions and Metal Oxide Surfaces on the Hydrolysis of Amide, Anilide, Carbamate, Hydrazide and Sulfonylurea Agrochemicals”, extended abstract of the 213th ACS National Meeting, Division of Agrochemicals, San Francisco, CA, April 13-17, 1997.

 

Conference Presentations (without proceedings):

1.      Padhye, L.; Tezel, U.; Pavlostathis, S. G.; Huang, C.-H. Fate and Formation of Nitrosamines in Municipal Wastewater Treatment Plants, oral and poster presentations at the IWA Young Water Professional Conference, Berkeley, CA, July 16-18, 2008.

2.      Padhye, L.; Tezel, U.; Pavlostathis, S. G.; Huang, C.-H. Fate and Formation of Nitrosamines in Water and Wastewater Treatment Plants, poster presented at the Kindsvatar Symposium, Atlanta, GA, March 26, 2008.

3.      Shian, S., Lee, S. J., Huang, C.-H. and Sandhag, K. H. Rapid, Non-photocatalytic Pesticide Hydrolysis in the Presence of Porous Titania Nanoparticle Structures Derived from Diatom Frustules. The 31st International Cocoa Beach Conference on Advanced Ceramics and Composites, January 21-26, 2007.

4.      Park, S. H., Wei, S., Mizaikoff, B., Taylor, A. E. and Huang, C.-H. Mechanistic Insight for the N-Nirosodimethylamine (NDMA) Formation Potential of Amine-based Polymers. Poster presented at the Drinking Water Disinfection By-Products Gordon Research Conference, Aug. 13-18, 2006, Mount Holyoke College, South Hadley, MA.

5.      Huang, C.-H., Dodd, M. C., Shah, A. D., von Guten, U. and Kim, J.-H. Reactions of Antibacterial Agents with Aqueous Chlorine under Water Treatment Conditions. Poster presented at the Drinking Water Disinfection By-Products Gordon Research Conference, Aug. 13-18, 2006, Mount Holyoke College, South Hadley, MA.

6.      Chen, W.-R., Zhang, H. and Huang, C.-H. Kinetic Modeling for the MnO2-Mediated Oxidation of Antibacterial Agents and Mechanistic Insight. Poster presented at the Environmental Sciences: Water Gordon Research Conference, June 25-30, 2006, Holderness School, Plymouth NH.

7.      Chen, W.-R. and Huang, C.-H. Transformation of Tetracycline Antibiotics with Manganese Oxide and Mn(II) Ions. Poster presented at the SETAC North America 26th Annual Meeting, Baltimore, November 13-17, 2005.

8.      Huang, C.-H., Lee, S. J., Shian, S. and Sandhage, K. H. Novel Nanostructured Anatase Assemblies from Algae as Strong Catalysts for the Hydrolysis of Organophosphorous Esters. The 79th ACS Colloid and Surface Science Symposium, Clarkson University, Potsdam, NY, June 12-15, 2005.

9.      Zhang, H. and Huang, C.-H. Adsorptive and Oxidative Transformation of Triclosan by Goethite and Soils. Poster presented at the Gordon Research Conference, Environmental Sciences: Water, New Hampton, NH, June 27-July 2, 2004.

10.  Zhang, H. and Huang, C.-H. Metal Oxide-Facilitated Oxidation of Fluoroquinolones and Structurally-Related Amine Compounds. The 77th ACS Colloid and Surface Science Symposium, Atlanta, GA, June 15-18, 2003.

11.  Renew, J. E. and Huang, C.-H. Fate Assessment for Fluoroquinolone, Sulfonamide and Trimethoprim Antibiotics in Engineered Water Treatment Systems. GW&PCA Conference, Cobb County, GA, May 21, 2003.

12.  Smeby, K. L., Renew, J. E. and Huang, C.-H. Occurrence and Fate of Antibiotic Compounds in Wastewater Treatment Systems. GW&PCA Conference, Cobb County, GA, August, 2002.

13.  Renew, J. E. and Huang, C.-H. and Smeby, K. L. Occurrence and Fate of Fluoroquinolone and Sulfonamide Antibiotics in Wastewater Treatment Systems. Poster presented at the Gordon Research Conference, Environmental Sciences: Water, New Hampton, NH, June, 2002.

14.  Zhang, H. and Huang, C.-H. Oxidative Transformation of Antibacterial Agents by Manganese (Hydr)oxides. Poster presented at the Gordon Research Conference, Environmental Sciences: Water, New Hampton, NH, June, 2002.

15.  Huang, C.-H.; Smeby, K. L.; Renew, J. E. Assessment of Potential Antibiotic Contaminants in Water and Preliminary Occurrence Analysis, poster presented at the AEES Symposium, Georgia Institute of Technology, March, 2002.

16.  Zhang, H.; Huang, C.-H. Oxidative Transformation of Antibacterial Agents by Manganese (Hydr)Oxides, poster presented at the AEES Symposium, Georgia Institute of Technology, March, 2002.

17.  Zhang, H.; Huang, C.-H. Oxidative Transformation of Antibacterial Agents by Manganese (Hydr)Oxides, poster presented at the Quadrangle Conference, University of North Carolina, Chapel Hill, NC, February, 2002.

18.  Huang, C.-H.; Smeby, K. L.; Renew, J. E. Assessment of Potential Antibiotic Contaminants in Water and Preliminary Occurrence Analysis, poster presented at the 22nd SETAC Meeting, Baltimore, MD, November, 2001.

19.  Huang, C.-H.; Cwiertny, D. M.; Sedlak, D. L. Immunochemical Techniques to Overcome the Analytical Challenges for Studies of Estrogenic Hormones in Environmental Matrices, poster presented at the Gordon Research Conference, Environmental Sciences: Water, New Hampton, NH, June, 2000.

20.  Huang, C.-H.; Sedlak, D. L. Analysis of Estrogenic Hormones in Municipal Wastewater Effluent and Surface Water Using ELISA and GC/MS/MS, poster presented at the AEES Symposium, Georgia Institute of Technology, March 22, 2000.

21.  Huang, C.-H.; Chien, M.; Sedlak, D. L. Synthetic and Natural Hormones in Wastewater Effluent: A Connection between Pharmaceutically Active Compounds and Endocrine Disruption?, oral presentation at the 19th SETAC Meeting, Charlotte, NC, November, 1998.

22.  Huang, C.-H.; Chien, M.; Sedlak, D. L.; Draper, W. M. Analysis of Estrogenic Hormones in Wastewater Effluent, poster presented at the University of California Toxic Substance Research and Teaching Program Symposium, Berkeley, CA, April 24-25, 1998.

23.  Huang, C.-H.; Stone, A. T. CuII-Catalyzed Hydrolysis of the Plant Growth Regulator Daminozide (Alar) and Structurally-Related Compounds Using Capillary Electrophoresis, poster presented at the Gordon Research Conference, Environmental Sciences: Water, New Hampton, NH, June, 1996.

24.  Huang, C.-H.; Stone, A. T. CuII-Catalyzed Hydrolysis of the Plant Growth Regulator Daminozide (Alar) and Structurally-Related Compounds Using Capillary Electrophoresis, oral presentation at the 17th SETAC Meeting, Washington, DC, November, 1996.

25.  Huang, C.-H.; Stone, A. T. The Effect of Metal Ions and Metal Complexes on the Hydrolysis of Amide, Anilide and Carbamate Agrochemicals, poster presented at the 2nd SETAC World Congress, Vancouver, Canada. November, 1995.

 

Technical Reports:

1.      Pavlostathis, S. G.; Huang, C.-H. 2008. SGER: Role of Anaerobic Digestion in N-Nitrosodimethylamine (NDMA) Formation in Municipal Wastewater Treatment Plants: Source or Sink. National Science Foundation, Final Report (Award # 0610358).

2.      Park, S. H.; Wei, S.; Huang, C-H.; Mizaikoff, B.; Aral, M. M. 2007. A Study of the Effect of Polymers on Potential N-Nitrosodimethylamine (NDMA) Formation at Water and Wastewater Treatment Plants," Multimedia Environmental Simulations Laboratory, School of Civil and Environmental Engineering, Georgia Institute of Technology, Report No. MESL-03-07, 107p, June 2007.

3.      Huang, C.-H. 2006. Elucidating the Oxidative Transformation of Antimicrobial Agents with Mn, Fe and Al Oxide. National Science Foundation, Final Report (Award # 0229172).

4.      Sedlak, D. L., Huang, C.-H. and Pinkston, K. 2005. Occurrence Survey of Pharmaceutically Active Compounds. Final technical report, American Water Works Association Research Foundation, Denver, CO (ISBN 1-58321-370-8).

5.      Huang, C.-H. 2003. Chlorination and Ozonation of Antibiotics Detected in Georgia Waters. Final technical report, U.S. Geological Survey, Georgia Water Resources Institute (Project 2002GA11B).

 

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