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1. Use of copeptin and high-sensitive cardiac troponin T for diagnosis and prognosis in patients with diabetes mellitus and suspected acute myocardial infarction

Author

Zellweger, C., Wildi, K., Twerenbold, R., Reichlin, T., Naduvilekoot, A., Neuhaus, J.D., Balmelli, C., Gabutti, M., Al Afify, A., Ballarino, P., Jäger, C., Druey, S., Hillinger, P., Haaf, P., Vilaplana, C., Darbouret, B., Ebmeyer, S., Rubini Gimenez, M., Moehring, B., Osswald, S., and Mueller, C.

Published
2015
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7. Abstracts of the 6th FECS Conference 1998 Lectures

Author

Rowland, F. Sherwood, Blake, Donald R., Larsen, B. R., Lindskog, Anne, Peterson, Peter J., Williams, W. Peter, Wallington, T. J., Pilling, M. J., Carslaw, N., Creasey, D. J., Heard, D. E., Jacobs, P., Lee, J., Lewis, A. C., McQuaid, J. B., Stockwell, William R., Frank, Hartmut, Sacco, P., Cocheo, V., Lynge, E., Andersen, A., Nilsson, R., Barlow, L., Pukkala, E., Nordlinder, R., Boffetta, P., Grandjean, P., Heikkil, P., Hürte, L. G., Jakobsson, R., Lundberg, I., Moen, B., Partanen, T., Riise, T., Borowiak, A., De Saeger, E., Schnitzler, K. G., Gravenhorst, G., Jacobi, H. W., Moelders, S., Lammel, G., Busch, G., Beese, F. O., Dentener, F. J., Feichter, J., Fraedrich, K., Roelofs, G. J., Friedrich, R., Reis, S., Voehringer, F., Simpson, D., Moussiopoulos, N., Sahm, P., Tourlou, P. M., Salmons, R., Papameletiou, D., Maqueda, J. M., Suhr, Per B., Bell, W., Paton-Walsh, C., Woods, P. T., Partridge, R. H., Slemr, J., Slemr, F., Schmidbauer, N., Ravishankara, A. R., Jenkin, Michael E., de Leeuw, G., van Eijk, A. M. J., Flossmann, A. I., Wobrock, W., Mestayer, P. G., Tranchant, B., Ljungström, E., Karlsson, R., Larsen, S. E., Roemer, M., Builtjes, P. J. H., Koffi, Brigitte, Koffi, Ernest N’Dri, De Saeger, Emile, Ro-Poulsen, H., Mikkelsen, T. N., Hummelshøj, P., Hovmand, M. F., Simoneit, Bernd R. T., van der Meulen, A., Meyer, Michael B., Berndt, T., Böge, O., Stratmann, F., Cass, Glen R., Harrison, Roy M., Shi, Ji Ping, Hoffmann, T., Warscheid, B., Bandur, R., Marggraf, U., Nigge, W., Kamens, Richard, Jang, Myoseon, Strommen, Mike, Chien, Chao-Jung, Leach, Keri, Ammann, M., Kalberer, M., Arens, F., Lavanchy, V., Gâggeler, H. W., Baltensperger, U., Davies, J. A., Cox, R. A., Alonso, S. García, Pastor, R. Pérez, Argüello, Gustavo A., Willner, Helge, Berndt, T., Böge, O., Bogillo, V. I., Pokrovskiy, V. A., Kuraev, O. V., Gozhyk, P. F., Bolzacchini, E., Bruschi, M., Fantucci, P., Meinardi, S., Orlandi, M., Rindone, B., Bolzacchini, Ezio, Bohn, Birger, Rindone, Bruno, Bruschi, Maurizo, Zetzsch, Cornelius, Brussol, C., Duane, M., Larsen, B., Carlier, P., Kotzias, D., Caracena, A. Baeza, Aznar, A. Miñana, Ferradás, E. González, Christensen, C. S., Skov, H., Hummelshøj, P., Jensen, N. O., Lohse, C., Cocheo, V., Sacco, P., Chatzis, C., Cocheo, V., Sacco, P., Boaretto, C., Quaglio, F., Zaratin, L., Pagani, D., Cocheo, L., Cocheo, Vincenzo, Asnar, Agustin Minana, Baldan, Annerita, Ballesta, Pascual P., Boaretto, Caterina, Caracena, Antonia B., Ferradas, Enrique Gonzalez, Gonzalez-Flesca, Nobert, Goelen, Eddie, Hansen, Asger B., Sacco, Paolo, De Saeger, Emile, Skov, Henrik, Consonni, V., Gramatica, P., Santagostino, A., Galvani, P., Bolzacchini, E., Consonni, Viviana, Gramatica, Paola, Todeschini, Roberto, Dippel, G., Reinhardt, H., Zellner, R., Dämmer, K., Bednarek, G., Breil, M., Zellner, R., Febo, A., Allegrini, I., Giliberti, C., Perrino, C., Fogg, P. G. T., Geiger, H., Barnes, I., Becker, K. H., Maurer, T., Geyskens, F., Bormans, R., Lambrechts, M., Goelen, E., Giese, Martina, Frank, Hartmut, Glasius, M., Hornung, P., Jacobsen, J. K., Klausen, H. S., Klitgaard, K. C., Møller, C. K., Petersen, A. P. F., Petersen, L. S., Wessel, S., Hansen, T. S., Lohse, C., Boaretto, E., Heinemeier, J., Glasius, M., Di Bella, D., Lahaniati, M., Calogirou, A., Jensen, N. R., Hjorth, J., Kotzias, D., Larsen, B. R., Gonzalez-Flesca, N., Cicolella, A., Bates, M., Bastin, E., Gurbanov, M. A., Akhmedly, K. M., Balayev, V. S., Haselmann, K. F., Ketola, R., Laturnus, F., Lauritsen, F. R., Grøn, C., Herrmann, H., Ervens, B., Reese, A., Umschlag, Th., Wicktor, F., Zellner, R., Herrmann, H., Umschlag, Th., Müller, K., Bolzacchini, E., Meinardi, S., Rindone, B., Jenkin, Michael E., Hayman, Garry D., Jensen, N. O., Courtney, M., Hummelshøj, P., Christensen, C. S., Larsen, B. R., Johnson, Matthew S., Hegelund, Flemming, Nelander, Bengt, Kirchner, Frank, Klotz, B., Barnes, Ian, Sørensen, S., Becker, K. H., Etzkorn, T., Platt, U., Wirtz, K., Martín-Reviejo, M., Laturnus, Frank, Martinez, E., Cabañas, B., Aranda, A., Martín, P., Salgado, S., Rodriguez, D., Masclet, P., Jaffrezo, J. L., Hillamo, R., Mellouki, A., Le Calvé, S., Le Bras, G., Moriarty, J., O’Donnell, S., Wenger, J., Sidebottom, H., Mingarrol, M. T. Bomboi, Cosin, S., Pastor, R. Pérez, Alonso, S. García, Sanz, M. J., Bravo, I., Gonzalez, D., Pérez, M. A., Mustafaev, Islam, Mammadova, Saida, Noda, J., Hallquist, M., Langer, S., Ljungström, E., Nohara, K., Kutsuna, S., Ibusuki, T., Oehme, Michael, Kölliker, Stephan, Brombacher, Stephan, Merz, Leo, Pastor, R. Pérez, Alonso, S. García, Cabezas, A. Quejido, Peeters, J., Vereecken, L., El Yazal, J., Pfeffer, Hans-Ulrich, Breuer, Ludger, Platz, J., Nielsen, O. J., Sehested, J., Wallington, T. J., Ball, J. C., Hurley, M. D., Straccia, A. M., Schneider, W. F., Pérez-Casany, M. P., Nebot-Gil, I., Sánchez-Marín, J., Putz, E., Folberth, G., Pfister, G., Weissflog, L., Elansky, N. P., Sørensen, Søren, Barnes, Ian, Becker, K. H., Shao, M., Heiden, A. C., Kley, D., Rockel, P., Wildt, J., Silva, G. V. A., Vasconcelos, M. T., Fernandes, E. O., Santos, A. M. S., Skov, Henrik, Hansen, Asger, Løfstrøm, Per, Lorenzen, Gitte, Stabel, J. R., Wolkoff, P., Pedersen, T., Strom, A. B., Skov, Henrik, Hertel, Ole, Jensen, Finn Palmgren, Hjorth, Jens, Galle, Bosse, Wallin, Svante, Theloke, J., Libuda, H. G., Zabel, F., Touaty, Muriel, Bonsang, Bernard, Ullerstam, M., Langer, S., Ljungström, E., Wenger, John, Bonard, Amélie, Manning, Marcus, Nolan, Sinéad, O’Sullivan, Niamh, Sidebottom, Howard, Wenger, John, Collins, Eoin, Moriarty, Jennie, O’Donnell, Sinéad, Sidebottom, Howard, Wenger, John, Collins, Eoin, Moriarty, Jennie, O’Donnell, Sinéad, Sidebottom, Howard, Wenger, John, Sidebottom, Howard, Chadwick, Paul, O’Leary, Barbara, Treacy, Jack, Wolkoff, Peder, Clausen, Per A., Wilkins, Cornelius K., Hougaard, Karin S., Nielsen, Gunnar D., Zilinskis, Viktors, Jansons, Guntis, Peksens, Aigars, Lazdins, Agris, Arinci, Y. V., Erdöl, N., Ekinci, E., Okutan, H., Manlafalioglu, I., Bakeas, Evangelos B., Siskos, Panayotis A., Viras, Loizos G., Smirnioudi, Vasiliki N., Bottenheim, Jan W., Biesenthal, Thomas, Gong, Wanmin, Makar, Paul, Delmas, Véronique, Menard, Tamara, Tatry, Véronique, Moussafir, Jacques, Thomas, Dominique, Coppalle, Alexis, Ellermann, Thomas, Hertel, Ole, Skov, Henrik, Frohn, Lise, Manscher, Ole H., Friis, Jørgen, Girgzdiene, Rasa, Girgzdys, Aloyzas, Gurevich, N. A., Gårdfeldt, Katarina, Langer, Sarka, Hermans, C., Vandaele, A. C., Carleer, M., Fally, S., Colin, R., Bernath, P. F., Jenouvrier, A., Coquart, B., Mérienne, M. -F., Hertel, Ole, Frohn, Lise, Skov, Henrik, Ellermann, Thomas, Huntrieser, H., Schlager, H., Feigl, C., Kemp, Kåre, Palmgren, Finn, Kiilsholm, Sissi, Rasmussen, Alix, Sørensen, Jens Havskov, Klemm, Otto, Lange, Holger, Larsen, René Wugt, Larsen, Niels Wessel, Nicolaisen, Flemming, Sørensen, Georg Ole, Beukes, Jon Are, Larsen, Poul Bo, Jensen, Steen Solvang, Fenger, Jes, de Leeuw, Gerrit, Kunz, Gerard, Cohen, Leo, Schlünzen, Heinke, Muller, Frank, Schulz, Michael, Tamm, Susanne, Geernaert, Gary, Hertel, Ole, Pedersen, Britta, Geernaert, Lise Lotte Sørensen, Lund, Søren, Vignati, Elisabetta, Jickells, Tim, Spokes, Lucinda, Matei, C., Jinga, O. A., Jinga, D. C., Moliner, R., Braekman-Danheux, C., Fontana, A., Suelves, I., Thieman, T., Vassilev, S., Skov, Henrik, Hertel, Ole, Zlatev, Zahari, Brandt, Jørgen, Bastrup-Birk, Annemarie, Ellermann, Thomas, Frohn, Lise, Vandaele, A. C., Hermans, C., Carleer, M., Tsouli, A., Colin, R., Windsperger, Andreas M., Turi, Kristina, Dworak, Oliver, Zellweger, C., Weingartner, E., Rüttimann, R., Hofer, P., Baltensperger, U., Ziv, A., Iakovleva, E., Palmgren, F., Berkovicz, R., Skov, H., Alastuey, A., Querol, X., Chaves, A., Lopez-Soler, A., Ruiz, C., Andrees, J. M., Allegrini, I., Febo, A., Giusto, M., Angeloni, M., Di Filippo, P., D’Innocenzio, F., Lepore, L., Marconi, A., Arshinov, M. Yu., Belan, B. D., Davydov, D. K., Kovaleskii, V. K., Plotinov, A. P., Pokrovskii, E. V., Sklyadneva, T. K., Tolmachev, G. N., Arshinov, M. Yu., Belan, B. D., Sklyadneva, T. K., Behnke, Wolfgang, Elend, Manfred, Krüger, Ulrich, Zetzsch, Cornelius, Belan, B. D., Arshinov, M. Yu., Davydov, D. K., Kovalevskii, V. K., Plotnikov, A. P., Pokrovskii, E. V., Rasskazchikova, T. M., Sklyadneva, T. K., Tolmachev, G. N., Belan, B. D., Arshinov, M. Yu., Simonenkov, D. V., Tolmachev, G. N., Bilde, Merete, Aker, Pamela M., Börensen, C., Kirchner, U., Scheer, V., Vogt, R., Ellermann, T., Geernaert, L. L. S., Pryor, S. C., Barthelmie, R. J., Feilberg, Anders, Nielsen, Torben, Kamens, Richard M., Freitas, M. C., Marques, A. P., Reis, M. A., Alves, L. C., Ilyinskikh, N. N., Ilyinskikh, I. N., Ilyinskikh, E. N., Johansen, Keld, Stavnsbjerg, Peter, Gabrielsson, Pär, Bak, Flemming, Andersen, Erik, Autrup, Herman, Kamens, Richard, Jang, Myoseon, Strommen, Michael, Leach, Keri, Kirchner, U., Scheer, V., Börensen, C., Vogt, R., Igor, Komov, Svjatoslav, Galiy, Anatoliy, Burlak, Komov, I. L., Istchenko, A. A., Lourenço, M. G., MacTavish, D., Sirois, A., Masclet, Pierre, Jaffrezo, Jean Luc, van der Meulen, A., Milukaite, A., Morkunas, V., Jurgutis, P., Mikelinskiene, A., Nielsen, Torben, Feilberg, Anders, Binderup, Mona Lise, Pineda, M., Palacios, J. M., Garcia, E., Cilleruelo, C., Moliner, R., Popovitcheva, O. B., Trukhin, M. E., Persiantseva, N. M., Buriko, Yu, Starik, A. M., Demirdjian, B., Suzanne, J., Probst, T. U., Rietz, B., Alfassi, Z. B., Pokrovskiy, V. A., Zenobi, R., Bogatyr’ov, V. M., Gun’ko, V. M., Querol, X., Alastuey, A., Lopez-Soler, A., Mantilla, E., Plana, F., Artiño, B., Rauterberg-Wulff, A., Israël, G. W., Rocha, Teresa A. P., Duarte, Armando C., Röhrl, Andreas, Lammel, Gerhard, Spindler, G., Müller, K., Herrmann, H., Strommen, Michael R., Vignati, Elisabetta, de Leeuw, Gerrit, and Berkowicz, Ruwim

Published
1998
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9. Peroxy acetyl nitrate (PAN) measurements at northern midlatitude mountain sites in April: a constraint on continental source--receptor relationships

Author

Fiore, A. M., Fischer, E. V., Milly, G. P., Pandey Deolal, S., Wild, O., Jaffe, Daniel A., Staehelin, J., Clifton, O. E., Bergmann, Daniel, Collins, W., Dentener, F. J., Doherty, R. M., Duncan, Bryan N., Fischer, Bernd M., Gilge, S., Hess, P. G., Horowitz, L. W., Lupu, A., MacKenzie, I. A., Park, Rokjin J., Ries, L., Sanderson, Michael G., Schultz, M. G., Shindell, D. T., Steinbacher, M., Stevenson, D. S., Szopa, Sophie, Zellweger, C., Zeng, Guang, Fiore, A. M., Fischer, E. V., Milly, G. P., Pandey Deolal, S., Wild, O., Jaffe, Daniel A., Staehelin, J., Clifton, O. E., Bergmann, Daniel, Collins, W., Dentener, F. J., Doherty, R. M., Duncan, Bryan N., Fischer, Bernd M., Gilge, S., Hess, P. G., Horowitz, L. W., Lupu, A., MacKenzie, I. A., Park, Rokjin J., Ries, L., Sanderson, Michael G., Schultz, M. G., Shindell, D. T., Steinbacher, M., Stevenson, D. S., Szopa, Sophie, Zellweger, C., and Zeng, Guang

Abstract

Abundance-based model evaluations with observations provide critical tests for the simulated mean state in models of intercontinental pollution transport, and under certain conditions may also offer constraints on model responses to emission changes. We compile multiyear measurements of peroxy acetyl nitrate (PAN) available from five mountain-top sites and apply them in a proof-of-concept approach that exploits an ensemble of global chemical transport models (HTAP1) to identify an observational “emergent constraint”. In April, when the signal from anthropogenic emissions on PAN is strongest, simulated PAN at northern midlatitude mountaintops correlates strongly with PAN source–receptor relationships (the response to 20% reductions in precursor emissions within northern midlatitude continents; hereafter, SRRs). This finding implies that PAN measurements can provide constraints on PAN SRRs by limiting the SRR range to that spanned by the subset of models simulating PAN within the observed range. In some cases, regional anthropogenic volatile organic compound (AVOC) emissions, tracers of transport from different source regions, and SRRs for ozone also correlate with PAN SRRs. Given the large observed interannual variability in the limited available datasets, establishing strong constraints will require matching meteorology in the models to the PAN measurements. Application of this evaluation approach to the chemistry–climate models used to project changes in atmospheric composition will require routine, long-term mountaintop PAN measurements to discern both the climatological SRR signal and its interannual variability.

Published
2018

10. Failure of Ceftriaxone in an Intravenous Drug User with Invasive Infection Due to Ralstonia pickettii

Author

Zellweger, C., Bodmer, T., Täuber, M., Mühlemann, K., Zellweger, C., Bodmer, T., Täuber, M., and Mühlemann, K.

Abstract

: We report a case of septic arthritis due to Ralstonia pickettii in an intravenous drug user with unfavorable clinical course under antibiotic therapy with ceftriaxone despite in vitro susceptibility to the drug. The treatment failure may have been due to a discrepancy between in vitro and in vivo susceptibility of R. pickettii, or to resistance development mediated by a recently described inducible ß-lactamase

Published
2018

11. Factors associated with rifampin resistance in staphylococcal periprosthetic joint infections (PJI): a matched case-control study

Author

Achermann, Y., Eigenmann, K., Ledergerber, B., Derksen, L., Rafeiner, P., Clauss, M., Nüesch, R., Zellweger, C., Vogt, M., Zimmerli, W., Achermann, Y., Eigenmann, K., Ledergerber, B., Derksen, L., Rafeiner, P., Clauss, M., Nüesch, R., Zellweger, C., Vogt, M., and Zimmerli, W.

Abstract

Purpose: Rifampin combination therapy plays an important role in the management of staphylococcal periprosthetic joint infection (PJI). However, the emergence of rifampin resistance is a feared complication. We retrospectively analysed predetermined potential risk factors in patients with rifampin-resistant staphylococcal PJI in a multicentre case-control study. Methods: Cases (n=48) were defined as PJI caused by rifampin-resistant staphylococci. Rifampin-susceptible controls (n=48) were matched for microorganism and type of prosthetic joint. Uni- and multivariable conditional logistic regression analyses were performed to estimate odds ratios (OR) with 95% confidence intervals (95% CI). Results: Forty-eight cases (31 men; median age 67years; age range 39-88years) with hip- (n=29), knee- (n=13), elbow- (n=4), shoulder- (n=1) or ankle-PJI (n=1) were enrolled in the study. Staphylococcus aureus and coagulase-negative staphylococci were isolated in ten and 38 episodes, respectively. Most of the cases (n=44, 92%) had a previous PJI, and 93 % (n=41) of these had been treated with rifampin. There was an independent association of emergence of rifampin resistance with male sex (OR 3.6, 95% CI 1.2-11),≥3 previous surgical revisions (OR 4.7, 95% CI 1.6-14.2), PJI treatment with high initial bacterial load (inadequate surgical debridement, <2weeks of intravenous treatment of the combination medication; OR 4.9, 95% CI 1.6-15) and inadequate rifampin therapy (OR 5.4, 95% CI 1.2-25). Conclusions: Based on our results, extensive surgical debridement and adequate antibiotic therapy are needed to prevent the emergence of rifampin resistance

Published
2018

12. Accuracy of Sensititre YeastOne echinocandins epidemiological cut-off values for identification of FKS mutant Candida albicans and Candida glabrata: a ten year national survey of the Fungal Infection Network of Switzerland (FUNGINOS)

Author

Kritikos, A., primary, Neofytos, D., additional, Khanna, N., additional, Schreiber, P.W., additional, Boggian, K., additional, Bille, J., additional, Schrenzel, J., additional, Mühlethaler, K., additional, Zbinden, R., additional, Bruderer, T., additional, Goldenberger, D., additional, Pfyffer, G., additional, Conen, A., additional, Van Delden, C., additional, Zimmerli, S., additional, Sanglard, D., additional, Bachmann, D., additional, Marchetti, O., additional, Lamoth, F., additional, Bregenzer, T., additional, Flückiger, U., additional, Orasch, C., additional, Heininger, U., additional, Franciolli, M., additional, Damonti, L., additional, Rothen, M., additional, Zellweger, C., additional, Tarr, P., additional, Fleisch, F., additional, Chuard, C., additional, Erard, V., additional, Emonet, S., additional, Garbino, J., additional, van Delden, C., additional, Genne, D., additional, Bochud, P., additional, Calandra, T., additional, Chave, J., additional, Graber, P., additional, Monotti, R., additional, Regionale, O., additional, Bernasconi, E., additional, Civico, O., additional, Rossi, M., additional, Krause, M., additional, Piso, R., additional, Bally, F., additional, Troillet, N., additional, Eich, G., additional, Gubler, J., additional, Fehr, J., additional, Imhof, A., additional, Ruef, C., additional, Berger, C., additional, Fankhauser, H., additional, Heinzer, I., additional, Frei, R., additional, Hertel, R., additional, Dolina, M., additional, Petrini, O., additional, Dubuis, O., additional, Graf, S., additional, Risch, M., additional, Ritzler, E., additional, Fracheboud, D., additional, Rohner, P., additional, Lienhardt, R., additional, Andreutti-Zaugg, C., additional, Gallusser, A., additional, Herzog, K., additional, Schibli, U., additional, Tissière, L., additional, and Schultze, D., additional

Published
2018
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13. Transport of PAN and NOy from different source regions to the Swiss high alpine site Jungfraujoch

Author

Deolal S. P., Staehelin J., Brunner D., Cui J. B., Steinbacher M., Zellweger C., Henne S., and Vollmer M. K.

Abstract

The effect of intercontinental transport on measurements of nitrogen oxides (NOx) peroxyacetyl nitrate (PAN) and reactive nitrogen species (NOy) at the high altitude site Jungfraujoch (3580 m asl) Switzerland was evaluated using a combination of backward trajectories and chemical filters (NOy to carbon monoxide (CO) ratio). Mixing ratios associated with air masses transported from the planetary boundary layers (PBL) of the three continental source regions Europe North America and Asia and of free tropospheric origin were characterized. The analysis was applied to PAN NOx and NOy measurements of the period 1997 1998 and to a period more than 10 years later covering several months in 2008 and 2009 2010. The results show that the mixing ratios of PAN NOx and NOy are largest in air advected from the European PBL. In contrast to previous studies our results indicate that the springtime maximum in PAN and NOy mixing ratios is largely attributable to air originating from the European PBL whereas air of free tropospheric origin and intercontinental transport contribute less significantly. PAN and NOy mixing ratios in air masses classified as free tropospheric are also highest in spring but substantially lower than those influenced by European PBL air. Air masses last influenced by the North American source region show considerably lower mixing ratios of nitrogen species than European air masses suggesting that a large fraction of NOy is removed during intercontinental transport probably due to washout of soluble species such as HNO3. The seasonal contributions from different source regions to PAN mixing ratios at Jungfraujoch were evaluated. The average European contribution is highest during the warm seasons with 47 57 in 1997 1998 and 61 69 in 2009 2010. The maximum contribution of North American air masses is also observed in the warm season and was about 5 7 in 1997 1998 and 6 10 in 2009 2010. Air from Asian source regions did not make a significant contribution due to the limited number of cases of direct transport from Asia but when they occurred the air masses contained significant pollutant levels. (C) 2012 Elsevier Ltd. All rights reserved.

Published
2013

14. Real-time analysis of δ13C- and δD-CH4 in ambient air with laser spectroscopy: method development and first intercomparison results

Author

Eyer, S., Tuzson, B., Popa, M. E., van der Veen, C., Röckmann, T., Rothe, M., Brand, W. A., Fisher, R., Lowry, D., Nisbet, E. G., Brennwald, M. S., Harris, E., Zellweger, C., Emmenegger, L., Fischer, H., Mohn, J., Marine and Atmospheric Research, Sub Algemeen Marine & Atmospheric Res, and Sub Atmospheric physics and chemistry

Abstract

In situ and simultaneous measurement of the three most abundant isotopologues of methane using mid-infrared laser absorption spectroscopy is demonstrated. A field-deployable, autonomous platform is realized by coupling a compact quantum cascade laser absorption spectrometer (QCLAS) to a preconcentration unit, called trace gas extractor (TREX). This unit enhances CH4 mole fractions by a factor of up to 500 above ambient levels and quantitatively separates interfering trace gases such as N2O and CO2. The analytical precision of the QCLAS isotope measurement on the preconcentrated (750 ppm, parts-per-million, µmole mole−1) methane is 0.1 and 0.5 ‰ for δ13C- and δD-CH4 at 10 min averaging time. Based on repeated measurements of compressed air during a 2-week intercomparison campaign, the repeatability of the TREX–QCLAS was determined to be 0.19 and 1.9 ‰ for δ13C and δD-CH4, respectively. In this intercomparison campaign the new in situ technique is compared to isotope-ratio mass spectrometry (IRMS) based on glass flask and bag sampling and real time CH4 isotope analysis by two commercially available laser spectrometers. Both laser-based analyzers were limited to methane mole fraction and δ13C-CH4 analysis, and only one of them, a cavity ring down spectrometer, was capable to deliver meaningful data for the isotopic composition. After correcting for scale offsets, the average difference between TREX–QCLAS data and bag/flask sampling–IRMS values are within the extended WMO compatibility goals of 0.2 and 5 ‰ for δ13C- and δD-CH4, respectively. This also displays the potential to improve the interlaboratory compatibility based on the analysis of a reference air sample with accurately determined isotopic composition.

Published
2016

15. Real-time analysis of delta13C- and delta D-CH4 in ambient air with laser spectroscopy: method development and first intercomparison results

Author

Eyer, S., Tuzson, B., Popa, M., van der Veen, C., Röckmann, T., Rothe, M., Brand, W., Fisher, R., Lowry, D., Nisbet, E., Brennwald, M., Harris, E., Zellweger, C., Emmenegger, L., Fischer, H., and Mohn, J.

Abstract

In situ and simultaneous measurement of the three most abundant isotopologues of methane using mid-infrared laser absorption spectroscopy is demonstrated. A field-deployable, autonomous platform is realized by coupling a compact quantum cascade laser absorption spectrometer (QCLAS) to a preconcentration unit, called TRace gas EXtractor (TREX). This unit enhances CH4 mole fractions by a factor of up to 500 above ambient levels and quantitatively separates interfering trace gases such as N2O and CO2. The analytical precision of the QCLAS isotope measurement on the preconcentrated (750 ppm, parts-per-million, μmole/mole) methane is 0.1 and 0.5 ‰ for δ13C- and δD-CH4 at 10 min averaging time. Based on replicate measurements of compressed air during a two-week intercomparison campaign, the repeatability of the TREX-QCLAS was determined to be 0.19 and 1.9 ‰ for δ13C and δD-CH4, respectively. In this intercomparison campaign the new in situ technique is compared to isotope-ratio mass-spectrometry (IRMS) based on glass flask and bag sampling and real time CH4 isotope analysis by two commercially available laser spectrometers. Both laser-based analyzers were limited to methane mole fraction and δ13C-CH4 analysis, and only one of them, a cavity ring down spectrometer, was capable to deliver meaningful data for the isotopic composition. After correcting for scale offsets, the average difference between TREX–QCLAS data and bag/flask sampling–IRMS values are within the extended WMO compatibility goals of 0.2 and 5 ‰ for δ13C- and δD-CH4, respectively. Thus, the intercomparison also reveals the need for reference air samples with accurately determined isotopic composition of CH4 to further improve the interlaboratory compatibility.

Published
2016

16. Evaluation of new laser spectrometer techniques for in-situ carbon monoxide measurements

Author

Zellweger, C., Steinbacher, M., and Buchmann, B.

Subjects
lcsh:TA715-787, lcsh:Earthwork. Foundations, lcsh:TA170-171, lcsh:Environmental engineering
Abstract

Long-term time series of the atmospheric composition are essential for environmental research and thus require compatible, multi-decadal monitoring activities. The current data quality objectives of the World Meteorological Organization (WMO) for carbon monoxide (CO) in the atmosphere are very challenging to meet with the measurement techniques that have been used until recently. During the past few years, new spectroscopic techniques came to market with promising properties for trace gas analytics. The current study compares three instruments that have recently become commercially available (since 2011) with the best currently available technique (Vacuum UV Fluorescence) and provides a link to previous comparison studies. The instruments were investigated for their performance regarding repeatability, reproducibility, drift, temperature dependence, water vapour interference and linearity. Finally, all instruments were examined during a short measurement campaign to assess their applicability for long-term field measurements. It could be shown that the new techniques perform considerably better compared to previous techniques, although some issues, such as temperature influence and cross sensitivities, need further attention.

Published
2012

17. Real-time analysis of &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C- and &lt;i&gt;δ&lt;/i&gt;D-CH&lt;sub&gt;4&lt;/sub&gt; in ambient air with laser spectroscopy: method development and first intercomparison results

Author

Eyer, S., primary, Tuzson, B., additional, Popa, M. E., additional, van der Veen, C., additional, Röckmann, T., additional, Rothe, M., additional, Brand, W. A., additional, Fisher, R., additional, Lowry, D., additional, Nisbet, E. G., additional, Brennwald, M. S., additional, Harris, E., additional, Zellweger, C., additional, Emmenegger, L., additional, Fischer, H., additional, and Mohn, J., additional

Published
2016
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18. Accuracy of Sensititre YeastOne echinocandins epidemiological cut-off values for identification of FKS mutant Candida albicans and Candida glabrata: a ten year national survey of the Fungal Infection Network of Switzerland (FUNGINOS)

Author

Bregenzer, T., Conen, A., Flückiger, U., Khanna, N., Orasch, C., Heininger, U., Franciolli, M., Damonti, L., Zimmerli, S., Rothen, M., Zellweger, C., Tarr, P., Fleisch, F., Chuard, C., Erard, V., Emonet, S., Garbino, J., van Delden, C., Genne, D., Bochud, P., Calandra, T., Lamoth, F., Marchetti, O., Chave, J., Graber, P., Monotti, R., Regionale, O., Bernasconi, E., Civico, O., Rossi, M., Krause, M., Piso, R., Bally, F., Troillet, N., Boggian, K., Eich, G., Gubler, J., Fehr, J., Imhof, A., Ruef, C., Berger, C., Fankhauser, H., Heinzer, I., Frei, R., Hertel, R., Dolina, M., Petrini, O., Dubuis, O., Mühlethaler, K., Graf, S., Risch, M., Ritzler, E., Fracheboud, D., Schrenzel, J., Rohner, P., Lienhardt, R., Bille, J., Andreutti-Zaugg, C., Gallusser, A., Pfyffer, G., Herzog, K., Schibli, U., Tissière, L., Bruderer, T., Schultze, D., Zbinden, R., Kritikos, A., Neofytos, D., Schreiber, P.W., Goldenberger, D., Van Delden, C., Sanglard, D., and Bachmann, D.

Published
2018
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19. Real-time analysis of δ13C- and δD-CH4 in ambient air with laser spectroscopy: method development and first intercomparison results

Author

Eyer, S., primary, Tuzson, B., additional, Popa, M. E., additional, van der Veen, C., additional, Röckmann, T., additional, Rothe, M., additional, Brand, W. A., additional, Fisher, R., additional, Lowry, D., additional, Nisbet, E. G., additional, Brennwald, M. S., additional, Harris, E., additional, Zellweger, C., additional, Emmenegger, L., additional, Fischer, H., additional, and Mohn, J., additional

Published
2015
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20. Seasonal variability of measured ozone production efficiencies in the lower free troposphere of Central Europe

Author

Zanis, P., Ganser, A., Zellweger, C., Henne, S., Steinbacher, M., Staehelin, J., Research Centre for Atmospheric Physics and Climatology [Athens], Academy of Athens, Department of Meteorology and Climatology [Thessaloniki], Aristotle University of Thessaloniki, Institute for Atmospheric and Climate Science [Zürich] (IAC), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Swiss Federal Laboratories for Materials Science and Technology [Dübendorf] (EMPA), and EGU, Publication

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, 010504 meteorology & atmospheric sciences, 13. Climate action, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, 01 natural sciences, 0105 earth and related environmental sciences
Abstract

International audience; In this study we present the seasonal variability of ozone production efficiencies (EN), defined as the net number of ozone molecules produced per molecule of nitrogen oxides (nitrogen oxide (NO) + nitrogen dioxide (NO2)=NOx) oxidized to NOz (total reactive nitrogen (NOy)?NOx) determined from field measurements of a seven-year period (1998?2004) at the Swiss high-alpine research station Jungfraujoch (JFJ), 3580 m a.s.l. This dataset is a unique long-term data series of nitrogen levels in the free troposphere over Central Europe and hence it offers an excellent opportunity to perform such an analysis and provide further evidence to the photochemical origin of the ozone spring maximum at locations of the northern hemisphere distant from nearby pollution sources. Experimentally derived daily EN values have been selected for 571 days out of the 2557 days from 1998 to 2004, from which an average ozone production efficiency of 18.8±1.3 molecules of O3 produced per molecule of NOx oxidized was calculated. This value indicates the great potential and importance of photochemical ozone production in the free troposphere. The monthly means of experimentally derived daily EN values show a seasonal variation with lower values from May to August, which can be probably attributed to more efficient vertical transport of polluted air masses from the atmospheric boundary layer up to JFJ. In agreement, theoretically derived monthly EN values show similar seasonal variation. The ratio NOy/CO, a parameter to assess the aging process that has occurred in an air parcel, was used as a criterion to disaggregate the 571 selected days between undisturbed and disturbed free tropospheric (FT). The monthly means of experimentally derived EN values for the undisturbed FT conditions show a distinct seasonal cycle with higher values in the cold season from November to April. The EN values for undisturbed FT conditions are particularly higher than the respective monthly EN values for disturbed FT conditions from February to October. It should be noted that the monthly EN values of March (EN=35.8) and April (EN=34.9) are among the highest values throughout the year for undisturbed FT conditions at JFJ. These results highlight the key and possibly the dominant role for photochemistry in the observed build-up of tropospheric ozone in the winter-spring transition period.

Published
2007

21. Direct comparison of high-sensitivity-cardiac troponin I vs. T for the early diagnosis of acute myocardial infarction

Author

Rubini Gimenez, M., primary, Twerenbold, R., additional, Reichlin, T., additional, Wildi, K., additional, Haaf, P., additional, Schaefer, M., additional, Zellweger, C., additional, Moehring, B., additional, Stallone, F., additional, Sou, S. M., additional, Mueller, M., additional, Denhaerynck, K., additional, Mosimann, T., additional, Reiter, M., additional, Meller, B., additional, Freese, M., additional, Stelzig, C., additional, Klimmeck, I., additional, Voegele, J., additional, Hartmann, B., additional, Rentsch, K., additional, Osswald, S., additional, and Mueller, C., additional

Published
2014
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22. Partitioning of reactive nitrogen (NOy) and dependence on meteorological conditions in the lower free troposphere

Author

Zellweger, C., Forrer, J., Hofer, P., Nyeki, S., Schwarzenbach, B., Weingartner, E., Ammann, M., Baltensperger, Urs, Laboratory of Air Pollution and Environmental Technology, Swiss Federal Laboratories for Materials Science and Technology [Thun] (EMPA), Institute for Environmental Research [Colchester], University of Essex, and Paul Scherrer Institute (PSI)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere
Abstract

International audience; Results of continuous nitrogen oxide (NO), nitrogen dioxide (NO2), peroxyacetyl nitrate (PAN) and total reactive nitrogen (NOy) measurements along with seasonal field campaigns of nitric acid (HNO3) and particulate nitrate (NO3-) measurements are presented for a two-year period at the high-alpine research station Jungfraujoch (JFJ), 3580 m asl. The NOy mixing ratio and partitioning is shown to strongly depend on meteorological conditions. Knowledge of these meteorological transport processes allows discrimination between undisturbed (i.e. clean) and disturbed (i.e. influenced by regional pollution sources) free tropospheric (FT) conditions at the JFJ. Median NOy concentrations during undisturbed FT periods ranged from 350 pptv (winter, December to February) to 581 pptv (spring, March to May). PAN was found to be the dominant NOy species during spring and summer, whereas NO2 was most abundant during autumn and winter. Particulate nitrate was found to contribute significantly to total NOy during thermally induced vertical transport. Föhn events, synoptical lifting (e.g. fronts) and thermally induced vertical transport resulted in mixing ratios up to 10 times higher at the JFJ compared to undisturbed FT conditions. Furthermore this meteorological variability of the NOy concentration and partitioning often dominated the seasonal variability. As a consequence the use of filters at the JFJ (and other mountainous sites) is crucial for the interpretation of data from such measurement sites. This study presents a further development of meteorological filters for the high-alpine site Jungfraujoch, which also could be modified and adapted to other mountainous measurement sites.

Published
2003

23. Validation of high-sensitivity troponin I in a 2-hour diagnostic strategy to assess 30-day outcomes in emergency department patients with possible acute coronary syndrome

Author

Cullen, L., Mueller, C., Parsonage, W., Wildi, K., Greenslade, J., Twerenbold, R., Aldous, S., Meller, B., Tate, J., Reichlin, T., Hammett, C., Zellweger, C., Ungerer, J., Rubini Gimenez, M., Troughton, R., Murray, K., Brown, A., Mueller, M., George, P., Mosimann, T., Flaws, D., Reiter, M., Lamanna, A., Haaf, P., Pemberton, C., Richards, A., Chu, K., Reid, Christopher, Peacock, W., Jaffe, A., Florkowski, C., Deely, J., Than, M., Cullen, L., Mueller, C., Parsonage, W., Wildi, K., Greenslade, J., Twerenbold, R., Aldous, S., Meller, B., Tate, J., Reichlin, T., Hammett, C., Zellweger, C., Ungerer, J., Rubini Gimenez, M., Troughton, R., Murray, K., Brown, A., Mueller, M., George, P., Mosimann, T., Flaws, D., Reiter, M., Lamanna, A., Haaf, P., Pemberton, C., Richards, A., Chu, K., Reid, Christopher, Peacock, W., Jaffe, A., Florkowski, C., Deely, J., and Than, M.

Abstract

Objectives The study objective was to validate a new high-sensitivity troponin I (hs-TnI) assay in a clinical protocol for assessing patients who present to the emergency department with chest pain. Background Protocols using sensitive troponin assays can accelerate the rule out of acute myocardial infarction in patients with low-risk (suspected) acute coronary syndrome (ACS). Methods This study evaluated 2 prospective cohorts of patients in the emergency department with ACS in an accelerated diagnostic pathway integrating 0- and 2-h hs-TnI results, Thrombolysis In Myocardial Infarction (TIMI) risk scores, and electrocardiography. Strategies to identify low-risk patients incorporated TIMI risk scores = 0 or =1. The primary endpoint was a major adverse cardiac event (MACE) within 30 days. Results In the primary cohort, 1,635 patients were recruited and had 30-day follow-up. A total of 247 patients (15.1%) had a MACE. The finding of no ischemic electrocardiogram and hs-TnI =26.2 ng/l with the TIMI = 0 and TIMI =1 pathways, respectively, classified 19.6% (n = 320) and 41.5% (n = 678) of these patients as low risk; 0% (n = 0) and 0.8% (n = 2) had a MACE, respectively. In the secondary cohort, 909 patients were recruited. A total of 156 patients (17.2%) had a MACE. The TIMI = 0 and TIMI =1 pathways classified 25.3% (n = 230) and 38.6% (n = 351), respectively, of these patients as low risk; 0% (n = 0) and 0.8% (n = 1) had a MACE, respectively. Sensitivity, specificity, and negative predictive value for TIMI = 0 in the primary cohort were 100% (95% confidence interval [CI]: 98.5% to 100%), 23.1% (95% CI: 20.9% to 25.3%), and 100% (95% CI: 98.8% to 100%), respectively. Sensitivity, specificity, and negative predictive value for TIMI =1 in the primary cohort were 99.2 (95% CI: 97.1 to 99.8), 48.7 (95% CI: 46.1 to 51.3), and 99.7 (95% CI: 98.9 to 99.9), respectively. Sensitivity, specificity, and negative value for TIMI =1 in the secondary cohort were 99.4% (95% CI: 96.5 to 1

Published
2013

24. Bulk and contact 1/f noise in GaN TLM structures

Author

Feyaerts, R., Vandamme, L.K.J., Trefan, G., Krämer, M.C.J.C.M., Zellweger, C., Ryssel, H., Wachutka, G., Grunbacher, H., Integrated Circuits, and Photonic Integration

Published
2001

28. Risk stratification in patients with acute chest pain using three high-sensitivity cardiac troponin assays

Author

Haaf, P., primary, Reichlin, T., additional, Twerenbold, R., additional, Hoeller, R., additional, Rubini Gimenez, M., additional, Zellweger, C., additional, Moehring, B., additional, Fischer, C., additional, Meller, B., additional, Wildi, K., additional, Freese, M., additional, Stelzig, C., additional, Mosimann, T., additional, Reiter, M., additional, Mueller, M., additional, Hochgruber, T., additional, Sou, S. M., additional, Murray, K., additional, Minners, J., additional, Freidank, H., additional, Osswald, S., additional, and Mueller, C., additional

Published
2013
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30. Real-time analysis of δ13C- and δD-CH4 in ambient air with laser spectroscopy: method development and first intercomparison results.

Author

Eyer, S., Tuzson, B., Popa, M. E., van der Veen, C., Röckmann, T., Rothe, M., Brand, W. A., Fisher, R., Lowry, D., Nisbet, E. G., Brennwald, M. S., Harris, E., Zellweger, C., Emmenegger, L., Fischer, H., and Mohn, J.

Subjects
METHANE spectra, LASER spectroscopy, QUANTUM cascade lasers, TRACE gases, MASS spectrometry
Abstract

In situ and simultaneous measurement of the three most abundant isotopologues of methane using mid-infrared laser absorption spectroscopy is demonstrated. A field-deployable, autonomous platform is realized by coupling a compact quantum cascade laser absorption spectrometer (QCLAS) to a preconcentration unit, called trace gas extractor (TREX). This unit enhances CH4 mole fractions by a factor of up to 500 above ambient levels and quantitatively separates interfering trace gases such as N2O and CO2. The analytical precision of the QCLAS isotope measurement on the preconcentrated (750 ppm, parts-per-million, µmole mole-1) methane is 0.1 and 0.5‰ for δ 13C- and δDCH4 at 10min averaging time. Based on repeated measurements of compressed air during a 2-week intercomparison campaign, the repeatability of the TREX--QCLAS was determined to be 0.19 and 1.9‰ for δ13C and ΔD-CH4, respectively. In this intercomparison campaign the new in situ technique is compared to isotoperatio mass spectrometry (IRMS) based on glass flask and bag sampling and real time CH4 isotope analysis by two commercially available laser spectrometers. Both laser-based analyzers were limited to methane mole fraction and δ13C-CH4 analysis, and only one of them, a cavity ring down spectrometer, was capable to deliver meaningful data for the isotopic composition. After correcting for scale offsets, the average difference between TREX--QCLAS data and bag/flask sampling--IRMS values are within the extended WMO com patibility goals of 0.2 and 5‰ for δ13C- and δD-CH4, respectively. This also displays the potential to improve the interlaboratory compatibility based on the analysis of a reference air sample with accurately determined isotopic composition. [ABSTRACT FROM AUTHOR]

Published
2016
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32. Supplementary material to "High accuracy measurements of dry mole fractions of carbon dioxide and methane in humid air"

Author

Rella, C. W., primary, Chen, H., additional, Andrews, A. E., additional, Filges, A., additional, Gerbig, C., additional, Hatakka, J., additional, Karion, A., additional, Miles, N. L., additional, Richardson, S. J., additional, Steinbacher, M., additional, Sweeney, C., additional, Wastine, B., additional, and Zellweger, C., additional

Published
2012
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40. Direct assessment of international consistency of standards for ground-level ozone: strategy and implementation toward metrological traceability network in Asia

Author

Tanimoto, H., primary, Mukai, H., additional, Sawa, Y., additional, Matsueda, H., additional, Yonemura, S., additional, Wang, T., additional, Poon, S., additional, Wong, A., additional, Lee, G., additional, Jung, J. Y., additional, Kim, K. R., additional, Lee, M. H., additional, Lin, N. H., additional, Wang, J. L., additional, Ou-Yang, C. F., additional, Wu, C. F., additional, Akimoto, H., additional, Pochanart, P., additional, Tsuboi, K., additional, Doi, H., additional, Zellweger, C., additional, and Klausen, J., additional

Published
2007
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41. Real-time analysis of δ13C- and δD-CH4 in ambient air with laser spectroscopy: method development and first intercomparison results.

Author

Eyer, S., Tuzson, B., Popa, M. E., Van der Veen, C., Röckmann, T., Rothe, M., Brand, W. A., Fisher, R., Lowry, D., Nisbet, E. G., Brennwald, M. S., Harris, E., Zellweger, C., Emmenegger, L., Fischer, H., and Mohn, J.

Subjects
ATMOSPHERIC methane analysis, LASER spectroscopy, AIR quality monitoring, ISOTOPOLOGUES, MASS spectrometry
Abstract

In situ and simultaneous measurement of the three most abundant isotopologues of methane using mid-infrared laser absorption spectroscopy is demonstrated. A fielddeployable, autonomous platform is realized by coupling a compact quantum cascade laser absorption spectrometer (QCLAS) to a preconcentration unit, called TRace gas EXtractor (TREX). This unit enhances CH4 mole fractions by a factor of up to 500 above ambient levels and quantitatively separates interfering trace gases such as N2O and CO2. The analytical precision of the QCLAS isotope measurement on the preconcentrated (750 ppm, parts-per-million, μmole/mole) methane is 0.1 and 0.5‰for δ13C and δD-CH4 at 10min averaging time. Based on replicate measurements of compressed air during a two-week intercomparison campaign, the repeatability of the TREX-QCLAS was determined to be 0.19 and 1.9‰ for δ13C and δD-CH4, respectively. In this intercomparison campaign the new in situ technique is compared to isotope-ratio mass-spectrometry (IRMS) based on glass flask and bag sampling and real time CH4 isotope analysis by two commercially available laser spectrometers. Both laser-based analyzers were limited to methane mole fraction and δ13C-CH4 analysis, and only one of them, a cavity ring down spectrometer, was capable to deliver meaningful data for the isotopic composition. After correcting for scale offsets, the average difference between TREX-QCLAS data and bag/flask sampling-IRMS values are within the extended WMO compatibility goals of 0.2 and 5‰ for δ13C- and δD-CH4, respectively. Thus, the intercomparison also reveals the need for reference air samples with accurately determined isotopic composition of CH4 to further improve the interlaboratory compatibility. [ABSTRACT FROM AUTHOR]

Published
2015
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