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Xu Y, Wu Y, Bhargawa B, Hong SH, Yoo IK. The Selective Removal of Bisphenol A Using a Magnetic Adsorbent Fused with Bisphenol A-Binding Peptides. Materials (Basel) 2024; 17:1651. [PMID: 38612165 PMCID: PMC11012372 DOI: 10.3390/ma17071651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 03/24/2024] [Accepted: 04/02/2024] [Indexed: 04/14/2024]
Abstract
The potential of bisphenol A (BPA)-binding peptides fused to magnetic beads is demonstrated as novel adsorbents that are reusable and highly selective for BPA removal from aqueous environments, in which various interfering substances coexist. Magnetic beads harboring peptides (peptide beads) showed a higher BPA removal capacity (8.6 mg/g) than that of bare beads without peptides (2.0 mg/g). The BPA adsorption capacity of peptide beads increased with the number of peptides fused onto the beads, where monomeric, dimeric, or trimeric repeats of a BPA-binding peptide were fused to magnetic beads. The BPA-adsorbing beads were regenerated using a methanol-acetic acid mixture, and after six regeneration cycles, the adsorption capacity remained above 87% of its initial capacity. The selective removal of BPA was confirmed in the presence of BPA analogs with high structural similarity (bisphenol F and bisphenol S) or in synthetic wastewater. The present work is a pioneering study that investigates the selective affinity of peptides to remove specific organics with high selectivity from complex environmental matrices.
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Affiliation(s)
- Yue Xu
- School of Chemical Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
| | - Yujie Wu
- School of Chemical Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
| | - Bharat Bhargawa
- School of Chemical Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
| | - Soon Ho Hong
- School of Chemical Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
| | - Ik-Keun Yoo
- School of Chemical Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
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Bhargawa B, Xu Y, Yoo IK, Kang SG, Ryu K. Enhanced adsorption of lead ions by enzymatically synthesized poly(m-phenylenediamine)-graphene oxide composites. KOREAN J CHEM ENG 2022. [DOI: 10.1007/s11814-022-1207-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Wang Y, Selvamani V, Yoo IK, Kim TW, Hong SH. A Novel Strategy for the Microbial Removal of Heavy Metals: Cell-surface Display of Peptides. BIOTECHNOL BIOPROC E 2021. [DOI: 10.1007/s12257-020-0218-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Wang Y, Maruthamuthu MK, Jeong J, Yoo IK, Kim TW, Hong SH. Development of fenitrothion adsorbing recombinant Escherichia coli by cell surface display of pesticide-binding peptide. J Biotechnol 2020; 322:90-95. [DOI: 10.1016/j.jbiotec.2020.07.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 06/15/2020] [Accepted: 07/19/2020] [Indexed: 11/16/2022]
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Xu Y, Yoo IK, Lee H, Ryu K. Adsorptive removal of heavy metal ions in water using poly(m-phenylenediamine) synthesized by laccase. Chem Pap 2019. [DOI: 10.1007/s11696-019-00723-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Yang J, Kim SE, Cho M, Yoo IK, Choe WS, Lee Y. Highly sensitive and selective determination of bisphenol-A using peptide-modified gold electrode. Biosens Bioelectron 2014; 61:38-44. [DOI: 10.1016/j.bios.2014.04.009] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 04/03/2014] [Accepted: 04/03/2014] [Indexed: 10/25/2022]
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Nguyen-Huy C, Kim N, Nguyen-Phan TD, Yoo IK, Shin EW. Adsorptive interaction of bisphenol A with mesoporous titanosilicate/reduced graphene oxide nanocomposite materials: FT-IR and Raman analyses. Nanoscale Res Lett 2014; 9:462. [PMID: 25258598 PMCID: PMC4164318 DOI: 10.1186/1556-276x-9-462] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Accepted: 08/29/2014] [Indexed: 05/20/2023]
Abstract
Nanocomposite materials containing graphene oxide have attracted tremendous interest as catalysts and adsorbents for water purification. In this study, mesoporous titanosilicate/reduced graphene oxide composite materials with different Ti contents were employed as adsorbents for removing bisphenol A (BPA) from water systems. The adsorptive interaction between BPA and adsorption sites on the composite materials was investigated by Fourier transform infrared (FT-IR) and Raman spectroscopy. Adsorption capacities of BPA at equilibrium, q e (mg/g), decreased with increasing Ti contents, proportional to the surface area of the composite materials. FT-IR observations for fresh and spent adsorbents indicated that BPA adsorbed onto the composite materials by the electrostatic interaction between OH functional groups contained in BPA and on the adsorbents. The electrostatic adsorption sites on the adsorbents were categorized into three hydroxyl groups: Si-OH, Ti-OH, and graphene-OH. In Raman spectra, the intensity ratios of D to G band were decreased after the adsorption of BPA, implying adsorptive interaction of benzene rings of BPA with the sp(2) hybrid structure of the reduced graphene oxide.
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Affiliation(s)
- Chinh Nguyen-Huy
- School of Chemical Engineering, University of Ulsan, Daehakro 93, Nam-gu, Ulsan 680-749, South Korea
| | - Nayoung Kim
- School of Chemical Engineering, University of Ulsan, Daehakro 93, Nam-gu, Ulsan 680-749, South Korea
| | | | - Ik-Keun Yoo
- School of Chemical Engineering, University of Ulsan, Daehakro 93, Nam-gu, Ulsan 680-749, South Korea
| | - Eun Woo Shin
- School of Chemical Engineering, University of Ulsan, Daehakro 93, Nam-gu, Ulsan 680-749, South Korea
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Nian R, Kim DS, Nguyen T, Tan L, Kim CW, Yoo IK, Choe WS. Chromatographic biopanning for the selection of peptides with high specificity to Pb2+ from phage displayed peptide library. J Chromatogr A 2010; 1217:5940-9. [DOI: 10.1016/j.chroma.2010.07.048] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2010] [Revised: 07/02/2010] [Accepted: 07/17/2010] [Indexed: 10/19/2022]
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Lee WS, Hong SH, Chung JS, Ryu K, Yoo IK. Comparison of the operational characteristics between a nitrifying membrane bioreactor and a pre-denitrification membrane bioreactor process. J IND ENG CHEM 2010. [DOI: 10.1016/j.jiec.2010.03.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Hartmann BM, Kaar W, Yoo IK, Lua LHL, Falconer RJ, Middelberg APJ. The chromatography-free release, isolation and purification of recombinant peptide for fibril self-assembly. Biotechnol Bioeng 2009; 104:973-85. [PMID: 19530081 DOI: 10.1002/bit.22447] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
One of the major expenses associated with recombinant peptide production is the use of chromatography in the isolation and purification stages of a bioprocess. Here we report a chromatography-free isolation and purification process for recombinant peptide expressed in Escherichia coli (E. coli). Initial peptide release is by homogenization and then by enzymatic cleavage of the peptide-containing fusion protein, directly in the E. coli homogenate. Release is followed by selective solvent precipitation (SSP) to isolate and purify the peptide away from larger cell contaminants. Specifically, we expressed in E. coli the self-assembling beta-sheet forming peptide P(11)-2 in fusion to thioredoxin. Homogenate was heat treated (55 degrees C, 15 min) and then incubated with tobacco etch virus protease (TEVp) to release P(11)-2 having a native N-terminus. SSP with ethanol at room temperature then removed contaminating proteins in an integrated isolation-purification step; it proved necessary to add 250 mM NaCl to homogenate to prevent P(11)-2 from partitioning to the precipitate. This process structure gave recombinant P(11)-2 peptide at 97% polypeptide purity and 40% overall yield, without a single chromatography step. Following buffer-exchange of the 97% pure product by bind-elute chromatography into defined chemical conditions, the resulting peptide was shown to be functionally active and able to form self-assembled fibrils. To the best of our knowledge, this manuscript reports the first published process for chromatography-free recombinant peptide release, isolation and purification. The process proved able to deliver functional recombinant peptide at high purity and potentially low cost, opening cost-sensitive materials applications for peptide-based materials.
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Affiliation(s)
- B M Hartmann
- Centre for Biomolecular Engineering, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St. Lucia, QLD 4072, Australia
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Hong ES, Park JH, Yoo IK, Ryu KG. Effects of structural difference of ionic liquids on the catalysis of horseradish peroxidase. J Microbiol Biotechnol 2009; 19:713-717. [PMID: 19652520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The dependence of the catalytic properties of horseradish peroxidase on the structural changes of ionic liquids was investigated with two water-miscible ionic liquids, N-butyl-3- methypyridinium tetrafluoroborate ([BMPy][BF4]) and 1-butyl- 3-methylimidazolium methylsulfate ([BMIM][MeSO4]), each of which shares an anion (BF4 -) or a cation (BMIM+) with 1-butyl- 3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), respectively. The oxidation of guaiacol (2-methoxyphenol) with H2O2 was used as a model reaction. In order to minimize the effect of solution viscosity on the kinetic constants of the enzymatic catalysis, the enzymatic reactions for the kinetic study were performed in water-ionic liquid mixtures containing 25% (v/v) ionic liquid at maximum. Similarly to the previously reported results for [BMIM][BF4], as the concentration of [BMPy][BF4] increased, the Km value increased with a decrease in the kcat value: the Km value increased markedly from 2.8 mM in 100% water to 12.6 mM in 25% (v/v) ionic liquid, indicating that ionic liquid significantly weakens the binding affinity of guaiacol to the enzyme. On the contrary, [BMIM][MeSO4] decreased the Km value to 1.4 mM in 25% (v/v) ionic liquid. [BMIM][MeSO4] also decreased kcat more than 3- folds [from 13.8 s-1 in 100% water to 4.1 s-1 in 25% (v/v) ionic liquid]. These results indicate that the ionic liquids interact with the enzyme at the molecular level as well as at a macroscopic thermodynamic scale. Specifically, the anionic component of the ionic liquids influenced the catalysis of horseradish peroxidase in different ways.
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Lee YM, Kwon OY, Yoo IK, Ryu KG. Effect of ionic liquid on the kinetics of peroxidase catalysis. J Microbiol Biotechnol 2007; 17:600-603. [PMID: 18051270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The effect of a water-miscible ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), on the horseradish peroxidase (HRP)-catalyzed oxidation of 2-methoxyphenol (guaiacol) with hydrogen peroxide (H2O2) was investigated. HRP maintains its high activity in the aqueous mixtures containing various concentrations of the ionic liquid and even in 90% (v/v) ionic liquid. In order to minimize the effect of solution viscosity on the kinetic constants of HRP catalysis, the enzymatic reactions in the subsequent kinetic study were performed in water-ionic liquid mixtures containing 25% (v/v) ionic liquid at maximum. As the concentration of [BMIM][BF4] increased for the oxidation of guaiacol by HRP, the K(m) value increased with a slight decrease in the k(cat) value: The K(m) value increased from 2.8 mM in 100% (v/v) water to 22.5 mM in 25% (v/v) ionic liquid, indicating that ionic liquid significantly weakens the binding affinity of guaiacol to HRP.
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Affiliation(s)
- Yoon-Mi Lee
- Department of Chemical Engineering and Bioengineering, University of Ulsan, Ulsan 680-749, Korea
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Kim EJ, Kim S, Yoo IK, Chung JS, Kim JS, Shah DO. CLOUD POINT AND DYE SOLUBILIZATION STUDIES OF AMPHIPHILIC DRUG SOLUTIONS: THE EFFECT OF ELECTROLYTES AND NONELECTROLYTES. CHEM ENG COMMUN 2006. [DOI: 10.1080/00986440500352014] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Alt C, Anticic T, Baatar B, Barna D, Bartke J, Betev L, Białkowska H, Billmeier A, Blume C, Boimska B, Botje M, Bracinik J, Bramm R, Brun R, Buncić P, Cerny V, Christakoglou P, Chvala O, Cramer JG, Csató P, Darmenov N, Dimitrov A, Dinkelaker P, Eckardt V, Farantatos G, Flierl D, Fodor Z, Foka P, Freund P, Friese V, Gál J, Gaździcki M, Georgopoulos G, Gładysz E, Grebieszkow K, Hegyi S, Höhne C, Kadija K, Karev A, Kliemant M, Kniege S, Kolesnikov VI, Kollegger T, Kornas E, Korus R, Kowalski M, Kraus I, Kreps M, van Leeuwen M, Lévai P, Litov L, Lungwitz B, Makariev M, Malakhov AI, Markert C, Mateev M, Mayes BW, Melkumov GL, Meurer C, Mischke A, Mitrovski M, Molnár J, Mrówczyński S, Pálla G, Panagiotou AD, Panayotov D, Petridis A, Pikna M, Pinsky L, Pühlhofer F, Reid JG, Renfordt R, Richard A, Roland C, Roland G, Rybczyński M, Rybicki A, Sandoval A, Sann H, Schmitz N, Seyboth P, Siklér F, Sitar B, Skrzypczak E, Stefanek G, Stock R, Ströbele H, Susa T, Szentpétery I, Sziklai J, Trainor TA, Varga D, Vassiliou M, Veres GI, Vesztergombi G, Vranić D, Wetzler A, Włodarczyk Z, Yoo IK, Zaranek J, Zimányi J. Omega- and Omega+ production in central Pb + Pb collisions at 40 and 158A GeV. Phys Rev Lett 2005; 94:192301. [PMID: 16090164 DOI: 10.1103/physrevlett.94.192301] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2004] [Indexed: 05/03/2023]
Abstract
Results are presented on Omega production in central Pb+Pb collisions at 40 and 158A GeV beam energy. For the first time in heavy ion reactions, rapidity distributions and total yields were measured for the sum Omega(-) + Omega(+) at 40A GeV and for Omega(-) and Omega(+) separately at 158A GeV. The yields are strongly underpredicted by the string-hadronic UrQMD model but agree better with predictions from hadron gas models.
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Affiliation(s)
- C Alt
- Fachbereich Physik der Universität, Frankfurt, Germany
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Alt C, Anticic T, Baatar B, Barna D, Bartke J, Betev L, Białkowska H, Billmeier A, Blume C, Boimska B, Botje M, Bracinik J, Bramm R, Brun R, Buncić P, Cerny V, Christakoglou P, Chvala O, Cramer JG, Csató P, Darmenov N, Dimitrov A, Dinkelaker P, Eckardt V, Farantatos G, Flierl D, Fodor Z, Foka P, Freund P, Friese V, Gál J, Gaździcki M, Georgopoulos G, Gładysz E, Grebieszkow K, Hegyi S, Höhne C, Kadija K, Karev A, Kliemant M, Kniege S, Kolesnikov VI, Kollegger T, Kornas E, Korus R, Kowalski M, Kraus I, Kreps M, van Leeuwen M, Lévai P, Litov L, Lungwitz B, Makariev M, Malakhov AI, Markert C, Mateev M, Mayes BW, Melkumov GL, Meurer C, Mischke A, Mitrovski M, Molnár J, Mrówczyński S, Pálla G, Panagiotou AD, Panayotov D, Petridis A, Pikna M, Pinsky L, Pühlhofer F, Reid JG, Renfordt R, Richard A, Roland C, Roland G, Rybczyński M, Rybicki A, Sandoval A, Sann H, Schmitz N, Seyboth P, Siklér F, Sitar B, Skrzypczak E, Stefanek G, Stock R, Ströbele H, Susa T, Szentpétery I, Sziklai J, Trainor TA, Trubnikov V, Varga D, Vassiliou M, Veres GI, Vesztergombi G, Vranić D, Wetzler A, Włodarczyk Z, Yoo IK, Zaranek J, Zimányi J. System-size dependence of strangeness production in nucleus-nucleus collisions at squareroot[sNN]=17.3 GeV. Phys Rev Lett 2005; 94:052301. [PMID: 15783629 DOI: 10.1103/physrevlett.94.052301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2004] [Indexed: 05/24/2023]
Abstract
Emission of pi+/-, K+/-, phi, and Lambda was measured in near-central C+C and Si+Si collisions at 158 AGeV beam energy. Together with earlier data for p+p, S+S, and Pb+Pb, the system-size dependence of relative strangeness production in nucleus-nucleus collisions is obtained. Its fast rise and the saturation observed at about 60 participating nucleons can be understood as the onset of the formation of coherent systems of increasing size.
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Affiliation(s)
- C Alt
- Fachbereich Physik der Universität, Frankfurt, Germany
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Anticic T, Baatar B, Barna D, Bartke J, Behler M, Betev L, Białkowska H, Billmeier A, Blume C, Boimska B, Botje M, Bracinik J, Bramm R, Brun R, Buncić P, Cerny V, Christakoglou P, Chvala O, Cramer JG, Csató P, Darmenov N, Dimitrov A, Dinkelaker P, Eckardt V, Filip P, Flierl D, Fodor Z, Foka P, Freund P, Friese V, Gál J, Gaździcki M, Georgopoulos G, Gładysz E, Hegyi S, Höhne C, Kadija K, Karev A, Kolesnikov VI, Kollegger T, Kornas E, Korus R, Kowalski M, Kraus I, Kreps M, van Leeuwen M, Lévai P, Litov L, Makariev M, Malakhov AI, Markert C, Mateev M, Mayes BW, Melkumov GL, Meurer C, Mischke A, Mitrovski M, Molnár J, Mrówczyński S, Pálla G, Panagiotou AD, Panayotov D, Perl K, Petridis A, Pikna M, Pinsky L, Pühlhofer F, Reid JG, Renfordt R, Retyk W, Roland C, Roland G, Rybczyński M, Rybicki A, Sandoval A, Sann H, Schmitz N, Seyboth P, Siklér F, Sitar B, Skrzypczak E, Stefanek G, Stock R, Ströbele H, Susa T, Szentpétery I, Sziklai J, Trainor TA, Varga D, Vassiliou M, Veres GI, Vesztergombi G, Vranić D, Wetzler A, Włodarczyk Z, Yoo IK, Zaranek J, Zimányi J. Lambda and lambda production in central Pb-Pb collisions at 40, 80, and 158A GeV. Phys Rev Lett 2004; 93:022302. [PMID: 15323906 DOI: 10.1103/physrevlett.93.022302] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2003] [Indexed: 05/24/2023]
Abstract
Production of Lambda and Antilambda hyperons was measured in central Pb-Pb collisions at 40, 80, and 158A GeV beam energy on a fixed target. Transverse mass spectra and rapidity distributions are given for all three energies. The Lambda/pi ratio at midrapidity and in full phase space shows a pronounced maximum between the highest BNL Alternating Gradient Synchrotron and 40A GeV CERN Super Proton Synchrotron energies, whereas the Lambda/pi ratio exhibits a monotonic increase.
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Affiliation(s)
- T Anticic
- Rudjer Boskovic Institute, Zagreb, Croatia
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Alt C, Anticic T, Baatar B, Barna D, Bartke J, Betev L, Białkowska H, Billmeier A, Blume C, Boimska B, Botje M, Bracinik J, Bramm R, Brun R, Buncić P, Cerny V, Christakoglou P, Chvala O, Cramer JG, Csató P, Darmenov N, Dimitrov A, Dinkelaker P, Eckardt V, Farantatos G, Filip P, Flierl D, Fodor Z, Foka P, Freund P, Friese V, Gál J, Gaździcki M, Georgopoulos G, Gładysz E, Hegyi S, Höhne C, Kadija K, Karev A, Kniege S, Kolesnikov VI, Kollegger T, Korus R, Kowalski M, Kraus I, Kreps M, van Leeuwen M, Lévai P, Litov L, Makariev M, Malakhov AI, Markert C, Mateev M, Mayes BW, Melkumov GL, Meurer C, Mischke A, Mitrovski M, Molnár J, Mrówczyński S, Pálla G, Panagiotou AD, Panayotov D, Perl K, Petridis A, Pikna M, Pinsky L, Pühlhofer F, Reid JG, Renfordt R, Retyk W, Roland C, Roland G, Rybczyński M, Rybicki A, Sandoval A, Sann H, Schmitz N, Seyboth P, Siklér F, Sitar B, Skrzypczak E, Stefanek G, Stock R, Ströbele H, Susa T, Szentpétery I, Sziklai J, Trainor TA, Varga D, Vassiliou M, Veres GI, Vesztergombi G, Vranić D, Wetzler A, Włodarczyk Z, Yoo IK, Zaranek J, Zimányi J. Evidence for an exotic S= -2, Q= -2 baryon resonance in proton-proton collisions at the CERN SPS. Phys Rev Lett 2004; 92:042003. [PMID: 14995366 DOI: 10.1103/physrevlett.92.042003] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2003] [Indexed: 05/24/2023]
Abstract
Results of resonance searches in the Xi(-)pi(-), Xi(-)pi(+), Xi;(+)pi(-), and Xi;(+)pi(+) invariant mass spectra in proton-proton collisions at sqrt[s]=17.2 GeV are presented. Evidence is shown for the existence of a narrow Xi(-)pi(-) baryon resonance with mass of 1.862+/-0.002 GeV/c(2) and width below the detector resolution of about 0.018 GeV/c(2). The significance is estimated to be above 4.2sigma. This state is a candidate for the hypothetical exotic Xi(--)(3/2) baryon with S=-2, I=3 / 2, and a quark content of (dsdsū). At the same mass, a peak is observed in the Xi(-)pi(+) spectrum which is a candidate for the Xi(0)(3/2) member of this isospin quartet with a quark content of (dsus[-]d). The corresponding antibaryon spectra also show enhancements at the same invariant mass.
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Affiliation(s)
- C Alt
- Fachbereich Physik der Universität, D-60486 Frankfurt, Germany
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Kim DJ, Chang JS, Lee DI, Han DW, Yoo IK, Cha GC. Nitrification of high strength ammonia wastewater and nitrite accumulation characteristics. Water Sci Technol 2003; 47:45-51. [PMID: 12906270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Biological nitrogen removal via the nitrite pathway in wastewater treatment is very important in saving the cost of aeration and as an electron donor for denitrification. Wastewater nitrification and nitrite accumulation were carried out in a biofilm airlift reactor with autotrophic nitrifying biofilm. The biofilm reactor showed almost complete nitrification and most of the oxidized ammonium was present as nitrite at the ammonium load of 1.5 to 3.5 kg N/m3 x d. Nitrite accumulation was stably achieved by the selective inhibition of nitrite oxidizers with free ammonia and dissolved oxygen limitation. Stable 100% conversion to nitrite could also be achieved even under the absence of free ammonia inhibition on nitrite oxidizers. Batch ammonium oxidation and nitrite oxidation with nitrite accumulating nitrifying biofilm showed that nitrite oxidation was completely inhibited when free ammonia is higher than 0.2 mg N/L. However, nitrite oxidation activity was recovered as soon as the free ammonia concentration was below the threshold level when dissolved oxygen concentration was not the limiting factor. Fluorescence in situ hybridization analysis of cryosectioned nitrite accumulating nitrifying biofilm showed that the beta-subclass of Proteobacteria, where ammonia oxidizers belong, was distributed outside the biofilm whereas the alpha-subclass of Proteobacteria, where nitrite oxidizers belong, was found mainly in the inner part of the biofilm. It is likely that dissolved oxygen deficiency or limitation in the inner part of the nitrifying biofilm, where nitrite oxidizers exist, is responsible for the complete shut down of the nitrite oxidizers activity under the absence of free ammonia inhibition.
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Affiliation(s)
- D J Kim
- Department of Environmental Systems Engineering, Hallym University, 1 Okchon, Chunchon, Kangwon 200-702, Korea.
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Abstract
It is important to produce L(+)-lactic acid at the lowest cost possible for lactic acid to become a candidate monomer material for promising biodegradable polylactic acid. In an effort to develop a high-rate bioreactor that provides high productivity along with a high concentration of lactic acid, the performance of membrane cell-recycle bioreactor (MCRB) was investigated via experimental studies and simulation optimization. Due to greatly increased cell density, high lactic acid productivity, 21.6 g L(-1) h(-1), was obtained in the reactor. The lactic acid concentration, however, could not be increased higher than 83 g/L. When an additional continuous stirred tank reactor (CSTR) was attached next to the MCRB a higher lactic acid concentration of 87 g/L was produced at significant productivity expense. When the two MCRBs were connected in series, 92 g/L lactic acid could be produced with a productivity of 57 g L(-1) h(-1), the highest productivity among the reports of L(+)-lactic acid that obtained lactic acid concentration higher than 85 g/L using glucose substrate. Additionally, the investigation of lactic acid fermentation kinetics resulted in a successful model that represents the characteristics of lactic acid fermentation by Lactobacillus rhamnosus. The model was found to be applicable to most of the existing data with MCRBs and was in good agreement with Levenspiel's product-inhibition model, and the Luedeking-Piret equation for product-formation kinetics appeared to be effective in representing the fermentation kinetics. There was a distinctive difference in the production potential of cells (cell-density-related parameter in Luedeking-Piret equation) as lactic acid concentration increases over 55 g/L, and this finding led to a more precise estimation of bioreactor performance.
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Affiliation(s)
- S Kwon
- Department of Chemical Engineering and BioProcess Engineering Research Center, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Taejon 305-701, South Korea
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Afanasiev SV, Anticic T, Bächler J, Barna D, Barnby LS, Bartke J, Barton RA, Betev L, Bialkowska H, Billmeier A, Blume C, Blyth CO, Boimska B, Botje M, Bracinik J, Brady FP, Bramm R, Brun R, Buncic P, Carr L, Cebra D, Cooper GE, Cramer JG, Csató P, Eckardt V, Eckhardt F, Ferenc D, Filip P, Fischer HG, Fodor Z, Foka P, Freund P, Friese V, Ftacnik J, Gál J, Gazdzicki M, Georgopoulos G, Gladysz E, Harris JW, Hegyi S, Hlinka V, Höhne C, Igo G, Ivanov M, Jacobs P, Janik R, Jones PG, Kadija K, Kolesnikov VI, Kollegger T, Kowalski M, Lasiuk B, van Leeuwen M, Lévai P, Malakhov AI, Margetis S, Markert C, Mayes BW, Melkumov GL, Mischke A, Molnár J, Nelson JM, Odyniec G, Pálla G, Panagiotou AD, Petridis A, Pikna M, Pinsky L, Poskanzer AM, Prindle DJ, Pühlhofer F, Reid JG, Renfordt R, Retyk W, Ritter HG, Röhrich D, Roland C, Roland G, Rybicki A, Sammer T, Sandoval A, Sann H, Schäfer E, Schmitz N, Seyboth P, Siklér F, Sitar B, Skrzypczak E, Snellings R, Squier GT, Stock R, Strmen P, Ströbele H, Susa T, Szarka I, Szentpétery I, Sziklai J, Toy M, Trainor TA, Trentalange S, Ullrich T, Varga D, Vassiliou M, Veres GI, Vesztergombi G, Voloshin S, Vranic D, Wang F, Weerasundara DD, Wenig S, Wetzler A, Whitten C, Xu N, Yates TA, Yoo IK, Zimányi J. Event-by-event fluctuations of the Kaon-to-Pion ratio in central Pb+Pb collisions at 158 GeV per nucleon. Phys Rev Lett 2001; 86:1965-1969. [PMID: 11289831 DOI: 10.1103/physrevlett.86.1965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2000] [Indexed: 05/23/2023]
Abstract
We present the first measurement of fluctuations from event to event in the production of strange particles in collisions of heavy nuclei. The ratio of charged kaons to charged pions is determined for individual central Pb+Pb collisions. After accounting for the fluctuations due to detector resolution and finite number statistics we derive an upper limit on genuine nonstatistical fluctuations, which could be related to a first- or second-order QCD phase transition. Such fluctuations are shown to be very small.
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Yoo IK, Kim DJ. Effects of hydraulic backwash load on effluent quality of upflow BAF. J Environ Sci Health A Tox Hazard Subst Environ Eng 2001; 36:575-585. [PMID: 11413840 DOI: 10.1081/ese-100103485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Using an upflow biological aerated filter (BAF) with treatment capacity of 100 ton/day, various hydraulic loads of backwashing water and influent were investigated to determine how they affect effluent quality of BAF during normal operation. The BAF packed with expanded polypropylene media of 3-5 mm diameter was operated over a five-month period for paper wastewater treatment. The average removal efficiencies of 78% for chemical oxygen demand (COD) and 88% for suspended solids (SS) were maintained, but the effluent CODs varied between 5-60 mg/l depending on the biodegradable fraction of influent wastewater. During normal BAF operation with cyclic backwash, the effluent SS concentrations showed initial peaks after backwash and gradually decreased to a steady state, while the soluble CODs of effluent did not significantly changed. The effluent SS concentrations and the required time intervals to reach steady state after backwash were related with hydraulic loads of backwashing water and influent wastewater applied to the BAF. A higher load of backwashing water gave larger deviation of initial SS peaks from the steady state, the extent of which was more significant under the higher load of influent wastewater.
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Affiliation(s)
- I K Yoo
- Department of Chemical Engineering, University of Ulsan, Ulsan 680-749, Korea.
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Wagner A, Muntz C, Oeschler H, Sturm C, Barth R, Cieslak M, D&ecedil;bowski M, Grosse E, Koczon P, Laue F, Mang M, Miskowiec D, Schwab E, Senger P, Beckerle P, Brill D, Shin Y, Strobele H, Walus W, Kohlmeyer B, Puhlhofer F, Speer J, Yoo IK. Emission pattern of high-energy pions: A new probe for the early phase of heavy-Ion collisions. Phys Rev Lett 2000; 85:18-21. [PMID: 10991148 DOI: 10.1103/physrevlett.85.18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/1999] [Indexed: 05/23/2023]
Abstract
The emission pattern of charged pions has been measured in Au+Au collisions at 1 GeV/nucleon incident energy. In peripheral collisions and at target rapidities, high-energy pions are emitted preferentially towards the target spectator matter. In contrast, low-energy pions are emitted predominantly in the opposite direction. The corresponding azimuthal anisotropy is explained by the interaction of pions with projectile and target spectator matter. This interaction with the spectator matter causes an effective shadowing which varies with time during the reaction. Our observations show that high-energy pions stem from the early stage of the collision whereas low-energy pions freeze out later.
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Affiliation(s)
- A Wagner
- Technische Universitat Darmstadt, D-64289 Darmstadt, Germany
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Chang HN, Seong GH, Yoo IK, Park JK, Seo JH. Microencapsulation of recombinantSaccharomyces cerevisiae cells with invertase activity in liquid-core alginate capsules. Biotechnol Bioeng 1996; 51:157-62. [DOI: 10.1002/(sici)1097-0290(19960720)51:2<157::aid-bit4>3.0.co;2-i] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abstract
Enhancement of productivity of a bioprocess necessitates continuous operation of bioreactors with high biomass concentrations than are possible in conventional batch, fedbatch or continuous modes of culture. Membrane-based cell recycle has been effectively used to maintain high cell concentrations in bioreactors. This review compares membranebased cell recycle operation with other such high density cell culture systems as immobilized cell reactors and reactors with cell recycle by centrifugation or gravity sedimentation. A theoretical of production of primary and secondary metabolites in membrane-based recycle systems is presented. Operation of this type of system is discussed with examples from aerobic and anaerobic fermentations.
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Affiliation(s)
- H N Chang
- Department of Chemical Engineering and BioProcess Engineering Research Center, Korea Advanced Institute of Science and Technology, Taejon, Korea
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