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Stellhorn JR, Paulus B, Klee BD, Inui M, Taniguchi H, Sutou Y, Hosokawa S, Pilgrim WC. Structural origins of the unusual thermal stability of amorphous Cu xGe 50-xTe 50(0⩽ x⩽33.3). J Phys Condens Matter 2023; 35:304004. [PMID: 37072003 DOI: 10.1088/1361-648x/acce13] [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: 01/15/2023] [Accepted: 04/18/2023] [Indexed: 06/19/2023]
Abstract
We have investigated the local atomic structures of several compositions of the amorphous phase of the system CuxGe50-xTe50(0⩽x⩽33.3), based on extended x-ray absorption fine-structure as well as anomalous x-ray scattering experiments, and discuss the unusual trend regarding their thermal stability as a function of the Cu content. At low concentrations (x⩽15), Cu atoms tend to agglomerate in flat nanoclusters reminiscent of the crystalline phase of metallic Cu, leading to a more and more Ge-deficient Ge-Te host network structure with growing Cu content and an increasing thermal stability. At higher Cu concentrations (x⩾25), Cu is incorporated into the network, leading to an overall weaker bonding situation which is associated with a decreasing thermal stability.
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Affiliation(s)
- J R Stellhorn
- Department of Physics, Nagoya University, Nagoya 464-0862, Japan
- Department of Applied Chemistry, Hiroshima University, Hiroshima 739-8527, Japan
- Department of Chemistry, Philipps University Marburg, Marburg 35032, Germany
| | - B Paulus
- Department of Chemistry, Philipps University Marburg, Marburg 35032, Germany
| | - B D Klee
- Department of Chemistry, Philipps University Marburg, Marburg 35032, Germany
- Wigner Research Centre for Physics, Budapest 1121, Hungary
| | - M Inui
- Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, 739-8521, Japan
| | - H Taniguchi
- Department of Physics, Nagoya University, Nagoya 464-0862, Japan
| | - Y Sutou
- Department of Materials Science, Tohoku University, Sendai 980-8579, Japan
- WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - S Hosokawa
- Department of Chemistry, Philipps University Marburg, Marburg 35032, Germany
- Institute of Industrial Nanomaterials, Kumamoto University, Kumamoto 860-8555, Japan
| | - W-C Pilgrim
- Department of Chemistry, Philipps University Marburg, Marburg 35032, Germany
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Qawasmeh Y, Töpfer K, Serwatka T, Tremblay JC, Paulus B. Theoretical investigations of the interaction between diatomic molecules and coinage metal atoms. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1892224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Y. Qawasmeh
- Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
| | - K. Töpfer
- Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
| | - T. Serwatka
- Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
| | - J. C. Tremblay
- Laboratoire de Physique et Chimie Théoriques, CNRS-Université de Lorraine, Metz, France
| | - B. Paulus
- Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
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Søndergaard L, Popma JJ, Reardon MJ, Van Mieghem NM, Deeb GM, Kodali S, George I, Williams MR, Yakubov SJ, Kappetein AP, Serruys PW, Grube E, Schiltgen MB, Chang Y, Engstrøm T, Sorajja P, Sun B, Agarwal H, Langdon T, den Heijer P, Bentala M, O’Hair D, Bajwa T, Byrne T, Caskey M, Paulus B, Garrett E, Stoler R, Hebeler R, Khabbaz K, Scott Lim D, Bladergroen M, Fail P, Feinberg E, Rinaldi M, Skipper E, Chawla A, Hockmuth D, Makkar R, Cheng W, Aji J, Bowen F, Schreiber T, Henry S, Hengstenberg C, Bleiziffer S, Harrison JK, Hughes C, Joye J, Gaudiani V, Babaliaros V, Thourani V, Dauerman H, Schmoker J, Skelding K, Casale A, Kovac J, Spyt T, Seshiah P, Smith JM, McKay R, Hagberg R, Matthews R, Starnes V, O’Neill W, Paone G, García JMH, Such M, de la Tassa CM, Cortina JCL, Windecker S, Carrel T, Whisenant B, Doty J, Resar J, Conte J, Aharonian V, Pfeffer T, Rück A, Corbascio M, Blackman D, Kaul P, Kliger C, Brinster D, Teefy P, Kiaii B, Leya F, Bakhos M, Sandhu G, Pochettino A, Piazza N, de Varennes B, van Boven A, Boonstra P, Waksman R, Bafi A, Asgar A, Cartier R, Kipperman R, Brown J, Lin L, Rovin J, Sharma S, Adams D, Katz S, Hartman A, Al-Jilaihawi H, Crestanello J, Lilly S, Ghani M, Bodenhamer RM, Rajagopal V, Kauten J, Mumtaz M, Bachinsky W, Nickenig G, Welz A, Olsen P, Watson D, Chhatriwalla A, Allen K, Teirstein P, Tyner J, Mahoney P, Newton J, Merhi W, Keiser J, Yeung A, Miller C, Berg JT, Heijmen R, Petrossian G, Robinson N, Brecker S, Jahangiri M, Davis T, Batra S, Hermiller J, Heimansohn D, Radhakrishnan S, Fremes S, Maini B, Bethea B, Brown D, Ryan W, Kleiman N, Spies C, Lau J, Herrmann H, Bavaria J, Horlick E, Feindel C, Neumann FJ, Beyersdorf F, Binder R, Maisano F, Costa M, Markowitz A, Tadros P, Zorn G, de Marchena E, Salerno T, Chetcuti S, Labinz M, Ruel M, Lee JS, Gleason T, Ling F, Knight P, Robbins M, Ball S, Giacomini J, Burdon T, Applegate R, Kon N, Schwartz R, Schubach S, Forrest J, Mangi A. Comparison of a Complete Percutaneous Versus Surgical Approach to Aortic Valve Replacement and Revascularization in Patients at Intermediate Surgical Risk: Results From the Randomized SURTAVI Trial. Circulation 2019; 140:1296-1305. [PMID: 31476897 DOI: 10.1161/circulationaha.118.039564] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND For patients with severe aortic stenosis and coronary artery disease, the completely percutaneous approach to aortic valve replacement and revascularization has not been compared with the standard surgical approach. METHODS The prospective SURTAVI trial (Safety and Efficiency Study of the Medtronic CoreValve System in the Treatment of Severe, Symptomatic Aortic Stenosis in Intermediate Risk Subjects Who Need Aortic Valve Replacement) enrolled intermediate-risk patients with severe aortic stenosis from 87 centers in the United States, Canada, and Europe between June 2012 and June 2016. Complex coronary artery disease with SYNTAX score (Synergy Between PCI with Taxus and Cardiac Surgery Trial) >22 was an exclusion criterion. Patients were stratified according to the need for revascularization and then randomly assigned to treatment with transcatheter aortic valve replacement (TAVR) or surgical aortic valve replacement (SAVR). Patients assigned to revascularization in the TAVR group underwent percutaneous coronary intervention, whereas those in the SAVR group had coronary artery bypass grafting. The primary end point was the rate of all-cause mortality or disabling stroke at 2 years. RESULTS Of 1660 subjects with attempted aortic valve implants, 332 (20%) were assigned to revascularization. They had a higher Society of Thoracic Surgeons risk score for mortality (4.8±1.7% versus 4.4±1.5%; P<0.01) and were more likely to be male (65.1% versus 54.2%; P<0.01) than the 1328 patients not assigned to revascularization. After randomization to treatment, there were 169 patients undergoing TAVR and percutaneous coronary intervention, 163 patients undergoing SAVR and coronary artery bypass grafting, 695 patients undergoing TAVR, and 633 patients undergoing SAVR. No significant difference in the rate of the primary end point was found between TAVR and percutaneous coronary intervention and SAVR and coronary artery bypass grafting (16.0%; 95% CI, 11.1-22.9 versus 14.0%; 95% CI, 9.2-21.1; P=0.62), or between TAVR and SAVR (11.9%; 95% CI, 9.5-14.7 versus 12.3%; 95% CI, 9.8-15.4; P=0.76). CONCLUSIONS For patients at intermediate surgical risk with severe aortic stenosis and noncomplex coronary artery disease (SYNTAX score ≤22), a complete percutaneous approach of TAVR and percutaneous coronary intervention is a reasonable alternative to SAVR and coronary artery bypass grafting. CLINICAL TRIAL REGISTRATION URL: https://www. CLINICALTRIALS gov. Unique identifier: NCT01586910.
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Affiliation(s)
- Lars Søndergaard
- Department of Cardiology, The Heart Centre, Rigshospitalet, University of Copenhagen, Denmark (L.S., T.E.)
| | - Jeffrey J. Popma
- Department of Internal Medicine, Beth Israel Deaconess Medical Center, Boston, MA (J.J.P.)
| | - Michael J. Reardon
- Department of Cardiovascular Surgery, Methodist DeBakey Heart and Vascular Center, Houston, TX (M.J.R.)
| | - Nicolas M. Van Mieghem
- Departments of Cardiology and Cardiothoracic Surgery, Erasmus University Medical Centre, Rotterdam, The Netherlands (N.M.V.M., A.P.K.)
| | - G. Michael Deeb
- Department of Cardiac Surgery, University of Michigan, Ann Arbor (G.M.D.)
| | - Susheel Kodali
- Department of Surgery, Columbia University Medical Center, New York (S.K., I.G.)
| | - Isaac George
- Department of Surgery, Columbia University Medical Center, New York (S.K., I.G.)
| | - Mathew R. Williams
- Departments of Medicine (Cardiology) and Cardiothoracic Surgery, NYU-Langone Medical Center, New York (M.R.W.)
| | - Steven J. Yakubov
- Department of Cardiology, OhioHealth Riverside Methodist Hospital, Columbus (S.J.Y.)
| | - Arie P. Kappetein
- Departments of Cardiology and Cardiothoracic Surgery, Erasmus University Medical Centre, Rotterdam, The Netherlands (N.M.V.M., A.P.K.)
- Structural Heart, Medtronic plc, Minneapolis, MN (A.P.K., M.B.S., Y.C.)
| | - Patrick W. Serruys
- International Centre for Circulatory Health, NHLI, Imperial College London, United Kingdom (P.W.S.)
| | - Eberhard Grube
- Department of Medicine II, Heart Center Bonn, Germany (E.G.)
| | | | - Yanping Chang
- Structural Heart, Medtronic plc, Minneapolis, MN (A.P.K., M.B.S., Y.C.)
| | - Thomas Engstrøm
- Department of Cardiology, The Heart Centre, Rigshospitalet, University of Copenhagen, Denmark (L.S., T.E.)
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Affiliation(s)
- T. Serwatka
- Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
| | - B. Paulus
- Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
| | - J. C. Tremblay
- Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
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Affiliation(s)
- E. Fertitta
- Department of Physics, King's College London, London, UK
| | - D. Koch
- Department of Mechanical Engineering, National University of Singapore, Singapore
| | - B. Paulus
- Institut für Chemie und Biochemie - Physikalische und Theoretische Chemie, Freie Universität Berlin, Berlin, Germany
| | - G. Barcza
- Strongly Correlated Systems “Lendület” Research Group, Wigner Research Centre for Physics, Budapest, Hungary
| | - Ö. Legeza
- Strongly Correlated Systems “Lendület” Research Group, Wigner Research Centre for Physics, Budapest, Hungary
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Koch D, Fertitta E, Paulus B. Calculation of the static and dynamical correlation energy of pseudo-one-dimensional beryllium systems via a many-body expansion. J Chem Phys 2016; 145:024104. [DOI: 10.1063/1.4955317] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- D. Koch
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany
| | - E. Fertitta
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany
| | - B. Paulus
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany
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Beiranvand Z, Kakanejadifard A, Donskyi IS, Faghani A, Tu Z, Lippitz A, Sasanpour P, Maschietto F, Paulus B, Unger WES, Haag R, Adeli M. Functionalization of fullerene at room temperature: toward new carbon vectors with improved physicochemical properties. RSC Adv 2016. [DOI: 10.1039/c6ra23419d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this work, fullerene has been functionalized with cyanuric chloride at room temperature by a nitrene mediated [2 + 1] cycloaddition reaction.
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Fertitta E, Paulus B, Barcza G, Legeza Ö. On the calculation of complete dissociation curves of closed-shell pseudo-onedimensional systems via the complete active space method of increments. J Chem Phys 2015; 143:114108. [DOI: 10.1063/1.4930861] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- E. Fertitta
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany
| | - B. Paulus
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany
| | - G. Barcza
- Strongly Correlated Systems “Lendület” Research Group, Wigner Research Centre for Physics, P.O. Box 49, Budapest, Hungary
| | - Ö. Legeza
- Strongly Correlated Systems “Lendület” Research Group, Wigner Research Centre for Physics, P.O. Box 49, Budapest, Hungary
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Diestler DJ, Kenfack A, Manz J, Paulus B, Pérez-Torres JF, Pohl V. Computation of the Electronic Flux Density in the Born–Oppenheimer Approximation. J Phys Chem A 2013; 117:8519-27. [DOI: 10.1021/jp4002302] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- D. J. Diestler
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany
- University of Nebraska—Lincoln, Lincoln, Nebraska 68583, United States
| | - A. Kenfack
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany
| | - J. Manz
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany
- Shanxi University, Laser Spectroscopy Laboratory, 92 Wucheng Road, Taiyuan 030006, PRC
| | - B. Paulus
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany
| | - J. F. Pérez-Torres
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany
| | - V. Pohl
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany
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Ovcharenko RE, Tupitsyn II, Savinov EP, Voloshina EN, Paulus B, Dedkov YS, Shulakov AS. Specific many-electron effects in X-ray spectra of simple metals and graphene. Phys Chem Chem Phys 2013; 15:6749-56. [DOI: 10.1039/c3cp44304c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Diestler DJ, Kenfack A, Manz J, Paulus B. Coupled-Channels Quantum Theory of Electronic Flux Density in Electronically Adiabatic Processes: Application to the Hydrogen Molecule Ion. J Phys Chem A 2011; 116:2736-42. [DOI: 10.1021/jp207844w] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- D. J. Diestler
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany
- University of Nebraska—Lincoln, Lincoln, Nebraska 68583, United States
| | - A. Kenfack
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany
| | - J. Manz
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany
| | - B. Paulus
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany
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Bendazzoli GL, Evangelisti S, Monari A, Paulus B, Vetere V. Full configuration-interaction study of the metal-insulator transition in model systems. ACTA ACUST UNITED AC 2008. [DOI: 10.1088/1742-6596/117/1/012005] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Chen W, Li D, Paulus B, Wilson I, Chadwick VS. High prevalence of Mycoplasma pneumoniae in intestinal mucosal biopsies from patients with inflammatory bowel disease and controls. Dig Dis Sci 2001; 46:2529-35. [PMID: 11713965 DOI: 10.1023/a:1012352626117] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
Intestinal microflora are believed to play an important role in the pathogenesis of inflammatory bowel disease (IBD). Mycoplasma have been suggested previously as organisms of ubiquitous distribution with the potential to cause inflammatory diseases, including IBD in susceptible individuals. The aim of this study was to determine the frequency of the presence of M. pneumoniae DNA in intestinal biopsies from patients with IBD and non-IBD controls using a microplate polymerase chain reaction-hybridization assay (PCR-ELISA). A total of 260 endoscopic biopsies (49 from 19 patients with Crohn's disease, 76 from 27 patients with ulcerative colitis, and 135 from 43 non-IBD controls) were used in this study. Overall, M. pneumoniae-specific DNA was detected in 100 endoscopic biopsy samples (38.5%). Among them, the detection rate of M. pneumoniae DNA was significantly higher in biopsies from patients with CD (59.2%) than in those from patients with UC (26.3%) or non-IBD controls (37.7%) (chi2 = 13.65, P < or = 0.001). The high prevalence of M. pneumoniae in both IBD patients and controls suggest this organism is ubiquitous and may persist in the intestinal mucosa. Epidemiological studies in IBD suggest acquisition of some agents early in life probably during epidemics in temperate latitudes. M. pneumoniae could be one of the ubiquitous agents implicated in the pathogenesis of IBD.
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Affiliation(s)
- W Chen
- Wakefield Gastroenterology Centre and Research Institute, Wakefield Hospital, Newtown, New Zealand
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Abstract
BACKGROUND The CC-chemokines eotaxin and eotaxin-2, produced by epithelial and phagocytic cells, are potent and selective chemoattractants for eosinophils and basophils. The eosinophil is a potent inflammatory cell thought to play an important role in the pathogenesis of inflammatory bowel disease (IBD). In this study we investigated the serum concentrations of eotaxin and eotaxin-2 in patients with Crohn disease and ulcerative colitis. METHODS Thirty-one patients with Crohn disease, 35 patients with ulcerative colitis and 41 control patients were studied. Eotaxin and eotaxin-2 serum levels were measured with solid phase sandwich enzyme-linked immunosorbent assays. RESULTS Significantly increased serum eotaxin levels were observed in both patients with Crohn disease (289.4+/-591.5 pg/ml) and ulcerative colitis (207.0+/-243.4 pg/ml) when compared with controls (138.0+/-107.8 pg/ml) (P < 0.01). Moreover, patients with active Crohn disease and ulcerative colitis showed significantly higher serum eotaxin levels than patients with quiescent disease (434.0+/-776.8 pg/ml versus 113.8+/-65.4 pg/ml in Crohn disease and 295.7+/-337.1 versus 121.2+/-91.9 pg/ml in ulcerative colitis, P < 0.05). In contrast, there was no significant difference in eotaxin-2 serum levels among patients with Crohn disease (863.5+/-448.2 pg/ml), ulcerative colitis (1028.3+/-431.4 pg/ml) and controls (981.4+/-539.4 pg/ml). CONCLUSIONS Eotaxin is significantly increased in serum of patients with active Crohn disease and ulcerative colitis, suggesting that this cytokine may play a role in the pathogenesis of IBD.
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Affiliation(s)
- W Chen
- Wakefield Gastroenterology Research Institute, Wakefield Hospital, Wellington South, New Zealand.
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Abstract
BACKGROUND The CC-chemokines eotaxin and eotaxin-2, produced by epithelial and phagocytic cells, are potent and selective chemoattractants for eosinophils and basophils. The eosinophil is a potent inflammatory cell thought to play an important role in the pathogenesis of inflammatory bowel disease (IBD). In this study we investigated the serum concentrations of eotaxin and eotaxin-2 in patients with Crohn disease and ulcerative colitis. METHODS Thirty-one patients with Crohn disease, 35 patients with ulcerative colitis and 41 control patients were studied. Eotaxin and eotaxin-2 serum levels were measured with solid phase sandwich enzyme-linked immunosorbent assays. RESULTS Significantly increased serum eotaxin levels were observed in both patients with Crohn disease (289.4+/-591.5 pg/ml) and ulcerative colitis (207.0+/-243.4 pg/ml) when compared with controls (138.0+/-107.8 pg/ml) (P < 0.01). Moreover, patients with active Crohn disease and ulcerative colitis showed significantly higher serum eotaxin levels than patients with quiescent disease (434.0+/-776.8 pg/ml versus 113.8+/-65.4 pg/ml in Crohn disease and 295.7+/-337.1 versus 121.2+/-91.9 pg/ml in ulcerative colitis, P < 0.05). In contrast, there was no significant difference in eotaxin-2 serum levels among patients with Crohn disease (863.5+/-448.2 pg/ml), ulcerative colitis (1028.3+/-431.4 pg/ml) and controls (981.4+/-539.4 pg/ml). CONCLUSIONS Eotaxin is significantly increased in serum of patients with active Crohn disease and ulcerative colitis, suggesting that this cytokine may play a role in the pathogenesis of IBD.
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Affiliation(s)
- W Chen
- Wakefield Gastroenterology Research Institute, Wakefield Hospital, Wellington South, New Zealand.
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Chen W, Li D, Paulus B, Wilson I, Chadwick VS. Detection of Listeria monocytogenes by polymerase chain reaction in intestinal mucosal biopsies from patients with inflammatory bowel disease and controls. J Gastroenterol Hepatol 2000; 15:1145-50. [PMID: 11106094 DOI: 10.1046/j.1440-1746.2000.02331.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND AND AIMS Components of the intestinal microflora are believed to play an important role in the pathogenesis of inflammatory bowel disease (IBD) in genetically susceptible hosts acting either as a non-specific antigenic stimulus or as a specific pathogen. Listeria monocytogenes has been suggested as an organism with the potential to cause IBD. The objective of the present study was to investigate the prevalence of L. monocytogenes DNA in intestinal biopsies from patients with IBD and from non-IBD controls by using nested polymerase chain reaction (PCR). METHODS The DNA was extracted from 274 colonoscopic biopsies, which were obtained from 23 patients with Crohn's disease (CD), 28 with ulcerative colitis (UC) and 39 non-IBD control patients. Nested PCR amplification was used to detect the presence of the L. monocytogenes listeriolysin O (hly) gene. The sequences of positive PCR products were determined and compared with databases. RESULTS The sensitivity of our nested PCR was 10 fg L. monocytogenes DNA. Overall, L. monocytogenes DNA was detected in 13.0% patients with CD, 17.9% patients with UC and 25.6% non-IBD control patients or in 29 of 274 (10.6%) endoscopic biopsies. Among them, L. monocytogenes DNA was detected in four of 67 (6%) biopsies from patients with CD, five of 94 (5.3%) biopsies from patients with UC and 20 of 113 biopsies (17.7%) from non-IBD control patients. Sequence analysis of positive PCR products demonstrated more than 95% similarity to the hly gene sequence of L. monocytogenes, confirming the authenticity of our PCR products. CONCLUSION Listeria monocytogenes DNA was detected in the intestine of both patients with IBD and in non-IBD control patients, probably reflecting the widespread presence of this organism in the environment. The low yield of positive biopsies in our IBD patients (5-6%) and the fact that the detection rate of L. monocytogenes DNA was similar in endoscopic biopsies from IBD patients and non-IBD controls does not support a direct role for L. monocytogenes in the pathogenesis of IBD, at least in New Zealand patients.
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Affiliation(s)
- W Chen
- Wakefield Gastroenterology Research Institute, Wakefield Hospital, Newtown, Wellington, New Zealand.
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Hauptmann H, Paulus B, Kaiser T, Luppa PB. Concepts for the syntheses of biotinylated steroids. Part II: 17beta-estradiol derivatives as immunochemical probes. Bioconjug Chem 2000; 11:537-48. [PMID: 10898576 DOI: 10.1021/bc9901651] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Biotinylated 17beta-estradiol (E2) derivatives are helpful probes for a better understanding of biospecific E2 interactions with steroid-binding proteins such as the estrogen receptor and anti-steroid antibodies. We describe synthetic strategies for the biotinylation of E2 toward the 3, 6alpha, and 7alpha positions using biotinyl-N-hydroxysuccinimide esters with different spacers, varying in structure and chain length. Key reaction for biotinylation at the 3 position is the regioselective ether formation of the phenolate E2 anion with a linker mesylate without protecting the 17beta-hydroxyl group. The 6alpha position is accessible via a 3,17beta protected 6alpha-hydroxy E2, prepared by stereospecific sodium borohydride reduction of 6-oxo E2. Direct cyanoethylation of the alcohol followed by reduction to the amine allows the biotinylation to 6alpha-O-coupled cyanoethyloxy linker E2 derivatives. Alternatively, 6alpha-O-coupled cyanoalkyloxy polyether linker E2 probes are obtained by a Williamson ether synthesis of the alcohol precursor with omega-t-butyl-dimethylsilyloxy-5-oxa-nonylmesylate. Cyanoethylation of the desilylated compound and further reduction of the nitrile led to the terminal amine. Reductive amination of the 3, 17beta acetylated 6-oxo E2 compound with 6-cyanoethyloxyhexyl ammonium acetate yields in a mixture of 6alpha/beta-N-alkylated E2 nitriles. The epimers are separated by reversed-phase HPLC and the 6alpha-compound subsequently reduced to the terminal amine. The 7alpha-biotinylated E2 compound is derived from 7alpha-(11'-undecyl-N-methyl-N-butylamide) E2, which is already known from literature. Subsequently, the 3 and 17beta positions are protected, and the amide is reduced to the 7alpha-(11'-undecanol) compound. Further cyanoethylation and reduction led to the 11'-amino-ethyloxyundecyl E2. Using (1)H NMR analysis, it could be shown that the biotin moiety of the biotinylated 6alpha- and 7alpha-E2 derivatives has an axial position which results in a vertical orientation of the substituent toward the alpha-face of the planar tetracyclic backbone. Thus, a negligible alteration of the original structure of the upper beta-face offers the feasibility of applying the 6alpha- and 7alpha-derivatives as optimal tracers in competitive immunoassays.
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Affiliation(s)
- H Hauptmann
- Institute for Organic Chemistry, Universität Regensburg, D-93053 Regensburg, Germany
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Hauptmann H, Paulus B, Kaiser T, Herdtweck E, Huber E, Luppa PB. Concepts for the syntheses of biotinylated steroids. Part I: testosterone derivatives as immunochemical probes. Bioconjug Chem 2000; 11:239-52. [PMID: 10725101 DOI: 10.1021/bc9901402] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We describe synthetic strategies for the biotinylation of testosterone (T) at positions 3, 7alpha, 17alpha, and 19. These T probes are able to mimic ligand binding and may provide for a better understanding of the biospecific interaction with steroid-binding proteins such as the androgen receptor, anti-steroid antibodies, or steroid-binding serum globulins. For the 7alpha- and 17alpha-derivatives, biotinyl-N-hydroxy-succinimide esters with different types of spacer chains were used. The 3-biotin hydrazone derivative was produced using N-(epsilon-biotinyl)-caproyl hydrazide, whereas for the 19-biotinylation, a biotinyl-1-N-diamino-3, 6-dioxaoctane-amide was applied. Key reaction for the biotinylation at position 3 is the oximation of the 3-oxo function. The 17alpha-position is accessible by the reaction of the 3-protected 4-androsten-17-epoxide with oxygen in the beta-position, followed by nucleophilic ring opening with cyanide which provides the 17alpha-cyanomethyl derivative. The key step is the regioselective ketal protection of the 3-oxo function of androst-4-ene-3,17-dione using a stannoxane catalyst. An alternative pathway for the insertion of biotin at the 19-position was established by the synthesis of 17beta-hydroxy-androst-4-en-3-one-19-yl carboxymethyl ether. After activation by the carbodiimide method, the compound reacts with aminoterminal biotin derivatives. The copper(I)-catalyzed 1,6 Michael addition of 17-acetoxy-6,7-dehydro-T leads to 7alpha-derivatives by use of omega-silyl protected hydroxylalkyl-modified Grignard reagents. A functional group interconversion using the Staudinger reaction transforms the azide function into a primary omega-amino group. The absolute configurations of the different biotinylated derivatives were investigated by (1)H NMR studies. For the 7alpha-biotinylated T series, additionally, an X-ray analysis proved the axial position of the spacer group. This results in a vertical orientation of the biotin moiety toward the alpha-face of the planar tetracyclic backbone. Thus, a negligible alteration of the original structure of the upper beta-face offers the feasibility of applying the 7alpha-derivatives as optimal immunochemical tracers in competitive immunoassays. Biotinylated T derivatives should be also suitable for ligand-binding studies to the androgen receptor or to sex hormone-binding globulin.
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Affiliation(s)
- H Hauptmann
- Institute for Organic Chemistry, Universität Regensburg, D-93053 Regensburg, Germany, Institute for Clinical Chemistry and Pathobiochemistry, Klinikum rechts der Isar, Technische Universität München, D-81675 München, Germany
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Luppa P, Brückner C, Schwab I, Hauck S, Schmidmayr S, Birkmayer C, Paulus B, Hauptmann H. 7 alpha-Biotinylated testosterone derivatives as tracers for a competitive chemiluminescence immunoassay of testosterone in serum. Clin Chem 1997; 43:2345-52. [PMID: 9439453] [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: 02/05/2023]
Abstract
Ring core-biotinylated testosterone tracers were synthesized with bridges of three different lengths connecting the biotin moiety to the steroid core (7 alpha-Cn-Bio-T, n = 3, 6, or 11). Together with a position 7-specific polyclonal anti-testosterone antibody, we used the 7 alpha-C11-Bio-T tracer to develop a novel, labeled-hapten competitive immunoassay for total testosterone in serum. (The C3 and C6 tracers proved to be not suitable for analogous immunoassays.) Enhanced chemiluminescence signal was generated by use of a second immobilized antibody and a streptavidin-horseradish peroxidase conjugate. The measuring range of the assay is 0.2-20.0 nmol/L, linearity of serial dilutions can be demonstrated, the lower detection limit is 0.125 nmol/L, and the interassay imprecisions are 13-16%. Accuracy determinations in mass spectrometry-controlled reference specimens showed a mean recovery of 95%. In addition, the assay shows low cross-reactivities, demonstrating the favorable specificity of the combination of a "nearly native" tracer with a position analog antibody. The optimized steric structure and the long spacer arm of the biotinylated testosterone tracer make this chemiluminescence assay well-suited for measuring total testosterone concentration in serum.
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Affiliation(s)
- P Luppa
- Institute of Clinical Chemistry and Pathobiochemistry, Klinikum rechts der Isar, Technical University Munich, Germany.
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Paulus B, Fulde P, Stoll H. Electron correlations for ground-state properties of group-IV semiconductors. Phys Rev B Condens Matter 1995; 51:10572-10578. [PMID: 9977752 DOI: 10.1103/physrevb.51.10572] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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