853 research outputs found
Quack grass
No full textTitle from PDF caption (viewed on November 14, 2017).This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
High-resolution gigahertz and terahertz spectroscopy of the isotopically chiral molecule Trans-2,3-dideutero-oxirane(c-chd-chdo)
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Previous issue date: 22We report the observation and assignment of the rotational spectra of the isotopically chiral molecule, trans-2,3-dideutero-oxirane (c-CHD-CHDO) measured in the Gigahertz range of 62-110 GHz and in the Terahertz range, 25-80 \wn (instrumental resolution of 0.00052 \wn). Normal oxirane (c-CHO) has been detected by astrophysical spectroscopy in space.\footnote{J. E. Dickens, et al., \emph{ApJ}, \textbf{1997}, 489, 753; M. Ikeda, et al., \emph{ApJ}, \textbf{2001}, 560, 792; J. M. Lykke, et al., \emph{A\&A},\textbf{2017}, 597, A53.}A small number of lines of trans-2,3-dideutero-oxirane had been previously analyzed in the microwave region\footnote{C. Hirose, \emph{Bull. Chem. Soc. Jap.}, \textbf{1974}, 47, 1311.} up to 70 GHz. We have recently \footnote{S. Albert, Z. Chen, K. Keppler, Ph. Lerch, M. Quack, V. Schurig, O. Trapp, \emph{Phys.Chem.Chem.Phys.}, \textbf{2019}, 21, 3669} measured and successfully analyzed the rotational spectrum of monodeutero-oxirane between 65 and 119 GHz using our GHz spectrometer \footnote{M. Suter, M. Quack, \emph{Appl. Opt.}, \textbf{2015}, 54 (14), 4417; S. Albert, Z. Chen, C. Fabri, Ph. Lerch, R. Prentner, M. Quack, \emph{Mol. Phys.}, \textbf{2016}, 114, 2751.}, and in the 0.75 to 2.5 THz range measured with our FTIR setup \footnote{S. Albert, Ph. Lerch, M. Quack, \emph{ChemPhysChem}, \textbf{2013}, 14, 3204; S. Albert, K. K. Albert, Ph. Lerch, M. Quack, \emph{Faraday Discuss.}, \textbf{2011}, 150, 71.} at the Swiss Light Source.In the current work, we were able to assign and analyze more than 2500 rotational transitions of the vibronic ground state of trans-2,3-dideutero-oxirane up to J=65. The molecule is also of interest in the context of molecular parity violation, similar to the related molecule fluoro-oxirane \footnote{H. Hollenstein, D. Luckhaus, J. Pochert, M. Quack, G. Seyfang, \emph{Angew. Chemie}, \textbf{1997}, 109 (1,2), 136; R. Berger, M. Quack, J. Stohner, \emph{Angew. Chem. Intl. Ed.}, \textbf{2001}, 40, 1667.}. Our results are important in relation to isotopic chirality and parity violation\footnote{M. Quack, \emph{Fundamental Symmetries and Symmetry Violations from High Resolution Spectroscopy}, in \emph{Handbook of High-resolution Spectroscopy}, M. Quack and F. Merkt eds. , Vol.1 , pp. 659-722 Wiley, Chichester \textbf{2011}}, and to the possible astrophysical observation of this molecule
Die Dynamik des Governance-Ansatzes. Vier Dimensionen im Wandel
No full textBotzem S, Hofmann J, Quack S, Schuppert GF, Straßheim H. Die Dynamik des Governance-Ansatzes. Vier Dimensionen im Wandel. In: Botzem S, Hofmann J, Quack S, Schuppert GF, Straßheim H, eds. Governance als Prozess. Koordinationsformen im Wandel. Schriften zur Governance-Forschung. Vol 16. Baden-Baden: Nomos; 2009: 11-26
Image as Text in Leonard Woolf’s ‘Quack, Quack in Politics’
No full textInternational audienceLeonard Woolf’s Essay ‘Quack, Quack in Politics’, written in 1935, is a disquisition on the current political situation in Germany and Italy and a powerful defence of civilization against barbarism. The author illustrates his point with propaganda photographs of the Nazi and fascist leaders and photographs of Hawaiian war-gods. The images are thus mediated by language, the text carefully analysing the photographs and integrating their message into the textual demonstration.What is particularly interesting for the reader today is not so much Leonard Woolf’s text and its now hackneyed arguments nor the photographs of the leaders, now well-known and often commented upon or used to various purposes, but the triangular relationship established by the author between text, image and image. How the image is mediated by verbal language but also by the other image, another form of language; how one deconstructs the other; what it tells us about Nazism and Fascism’s hold on the visual image, about political pamphlets and art is what we mean to explore, especially in the light of Virginia Woolf’s essay ‘The Leaning Tower’ and her own work on photography
High Resolution Infrared Spectroscopy Of Aziridine-2-carbonitrile (c3h4n2)
No full textMolecular parity violation has been critically discussed in relation to biomolecular homochirality in the early evolution of life
\footnote{M. Quack, , 41(24), 4618; , 157, 249, www.ir.ETHz.CH.}. In this context molecules of potential importance for prebiotic chemistry like the small, chiral three-membered heterocyclic molecule aziridine-2-carbonitrile (2-cyanoaziridine) are of interest \footnote{A. Eschenmoser and E. Loewenthal, , 21, 1.}. Indeed, this molecule has been previously examined \footnote{S. Drenkard, J. Ferris, and A. Eschenmoser, , 73, 1373.} and the parity violating energy difference between the enantiomers in their ground state has also been calculated \footnote{R. Berger, M. Quack and G.S. Tschumper, , 83(8), 1919.}. Molecular parameters for the ground state of this molecule are available from earlier microwave studies \footnote{R.D. Brown, P.D. Godfrey, and A.L. Ottrey, , 82, 73.}, and its conformations have been examined by theory \footnote{G.S. Tschumper, , 114(1), 225.}.
Here we report initial results of a high resolution spectroscopic study of cyanoaziridine, carried out at room temperature with an instrumental resolution of 0.0011 \wn \ in the 800-1000 \wn \ region using the Bruker IFS125 Zurich Prototype (ZP2001) Fourier transform spectrometer \footnote{S. Albert, K. Albert and M. Quack, , 84, 177; S. Albert, K. Keppler Albert, M. Quack, Ch. 26, Handbook of High-Resolution Spectroscopy, Vol. 2, p. 965--1019, M. Quack, F. Merkt, Eds., Wiley, Chichester (2011).}.
Transitions in the \nub{15} and \nub{16} bands have been assigned, and molecular parameters have been determined using the Watson Hamiltonian. Simulations performed using these parameters reproduce the observed spectra well. The results are discussed in relation to astrophysical spectroscopy and recent efforts on parity violation in chiral molecules \footnote{M. Quack and G. Seyfang,“Tunnelling and Parity Violation in Chiral and Achiral Molecules: Theory and High-Resolution Spectroscopy,” Chapter 6, Tunnelling in Molecules: Nuclear Quantum Effects from Bio to Physical Chemistry, p.192--244, J. Kästner, S. Kozuch, Eds., RSC, Cambridge (2020), ISBN: 978-1-78801-870-8; M. Quack, G. Seyfang, G. Wichmann, , 81, 51--104.}
High Resolution Infrared Spectroscopy Of Cyano-oxirane (c-c<sub>2</sub>h<sub>3</sub>ocn)
No full text"Oxiranecarbonitrile (cyano-oxirane, c-CHOCN) is of interest as a possible chiral precursor molecule of evolution\footnote{M. Bolli, R. Micura, A. Eschenmoser, \emph{Chem. Biol.}, \textbf{1997}, 4, 309 (and refs. cited therein).}. We have calculated parity violation in this molecule in view of possible experiments and biomolecular homochirality\footnote{R. Berger, M. Quack, G. Tschumper, \emph{Helv. Chim. Acta.}, \textbf{2000}, 83, 1919; M. Quack, \emph{Chem. Phys. Lett.} \textbf{1986}, 132, 147; M. Quack, \emph{Angew. Chem. Intl. Ed.}, \textbf{2002}, 41, 4618.}. Its spectrum has been investigated in the millimeter, submillimeter\footnote{M. Behnke, I. Medvedev, M. Winnewisser, F. C. De Lucia, and E. Herbst, \emph{ApJ. Supplement Series}, \textbf{2004}, 152, 97.}
and terahertz\footnote{S. Albert, Ph. Lerch, K. Keppler and M. Quack, \emph{Proceedings of the XX. Symposium on Atomic, Cluster and Surface Physics 2016, (SASP 2016)}, Innsbruck University Press (2016), pp. 165-168 (and refs. cited therein).} regions. We have recorded its infrared spectrum at 295K with resolution 0.0011 \wn using the Zurich Prototype ZP 2001 FTIR spectrometer \footnote{S. Albert, K. Albert and M. Quack, \emph{Trends in Optics and Photonics}, \textbf{2003}, 84, 177; ""Handbook,"" Vol. 2, pp. 965-1019 (see also \textit{f}).}. We report here the results of the rovibrational analysis transitions associated with the \nub{12} (915.3 \wn) and \nub{13} (848.2 \wn) fundamentals using a Watson Hamiltonian and the WANG program\footnote{D. Luckhaus and M. Quack, \emph{Mol. Phys.}, \textbf{1989}, 68, 745; S. Albert, K. Keppler Albert, H. Hollenstein, C. Manca Tanner, M. Quack in ""Handbook of High-Resolution Spectroscopy,"" M. Quack and F. Merkt, Eds., 2011, Vol. 1, Chapter 3, pp. 117-173, Wiley, Chichester.}, including molecular parameters and ground state energies from our work in the THz region. Simulations performed using the parameters reproduce the observed spectrum well. The results are discussed in relation to astrophysical spectroscopic searches and the evolution of biomolecular homochirality\footnote{M. Quack, \emph{Adv. Chem. Phys.}, \textbf{2014}, 157, 249 (and refs. cited therein); M. Quack and G. Seyfang, in ""Molecular Spectroscopy and Quantum Dynamics,"" R. Marquardt and M. Quack, Eds., 2020, Ch. 7, pp. 231-282, Elsevier, Amsterdam, see also www.ir.ETHz.CH}."Made available in DSpace on 2021-09-24T21:08:48Z (GMT). No. of bitstreams: 2
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Previous issue date: 2021-06-2
High-resolution Gigahertz And Terahertz Spectroscopy Of The Isotopically Chiral Molecule Trans-2,3-dideutero-oxirane(c-chd-chdo)
No full textWe report the observation and assignment of the rotational spectra of the isotopically chiral molecule, trans-2,3-dideutero-oxirane (c-CHD-CHDO) measured in the gigahertz range of 62-110 GHz and in the terahertz range, 25-80 \wn (instrumental resolution of 0.00052 \wn). Normal oxirane (c-CHO) has been detected by astrophysical spectroscopy in space.\footnote{J. E. Dickens, et al., \emph{ApJ}, \textbf{1997}, 489, 753; M. Ikeda, et al., \emph{ApJ}, \textbf{2001}, 560, 792; J. M. Lykke, et al., \emph{A\&A},\textbf{2017}, 597, A53.}A small number of lines of trans-2,3-dideutero-oxirane had been previously analyzed in the microwave region\footnote{C. Hirose, \emph{Bull. Chem. Soc. Jap.}, \textbf{1974}, 47, 1311.} up to 70 GHz. We have recently \footnote{S. Albert, Z. Chen, K. Keppler, Ph. Lerch, M. Quack, V. Schurig, O. Trapp, \emph{Phys.Chem.Chem.Phys.}, \textbf{2019}, 21, 3669} measured and successfully analyzed the rotational spectrum of monodeutero-oxirane between 65 and 119 GHz using our GHz spectrometer,\footnote{M. Suter, M. Quack, \emph{Appl. Opt.}, \textbf{2015}, 54 (14), 4417; S. Albert, Z. Chen, C. Fabri, Ph. Lerch, R. Prentner, M. Quack, \emph{Mol. Phys.}, \textbf{2016}, 114, 2751.} and in the 0.75 to 2.5 THz range measured with our FTIR setup \footnote{S. Albert, Ph. Lerch, M. Quack, \emph{ChemPhysChem}, \textbf{2013}, 14, 3204; S. Albert, K. K. Albert, Ph. Lerch, M. Quack, \emph{Faraday Discuss.}, \textbf{2011}, 150, 71.} at the Swiss Light Source.In the current work, we were able to assign and analyze more than 2500 rotational transitions of the vibronic ground state of trans-2,3-dideutero-oxirane up to J=65. The molecule is also of interest in the context of molecular parity violation, similar to the related molecules.\footnote{M. Quack and G. Seyfang, \emph{Tunnelling and parity violation in chiral and achiral molecules}, ch.6 in \emph{Tunnelling in Molecules}, J.Kaestner and S. Kozuch eds.,pp 192-244, RSC publishing, Cambridge \textbf{2020}, and references cited therein.} Our results are important in relation to isotopic chirality and parity violation,\footnote{M. Quack, \emph{Fundamental Symmetries and Symmetry Violations from High Resolution Spectroscopy}, in \emph{Handbook of High-resolution Spectroscopy}, M. Quack and F. Merkt eds. , Vol.1 , pp. 659-722, Wiley, Chichester \textbf{2011}.} and to the possible astrophysical observation of this molecule.Made available in DSpace on 2021-09-24T21:08:48Z (GMT). No. of bitstreams: 2
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A combined gigahertz and terahertz synchrotron-based Fourier transform infrared spectroscopic investigation of ortho-D-phenol
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Previous issue date: 6Tunneling switching is a fundamental phenomenon of interest in molecular quantum dynamics including also chiral molecules and parity violation.footnote{M. Quack , textit{Fundamental Symmetries and Symmetry Violations from High-resolution Spectroscopy}, textit{Handbook of High Resolution Spectroscopy, M. Quack and F. Merkt eds.},John Wiley & Sons Ltd, Chichester, New York, 2001, vol. 1, ch. 18, pp. 659-722.}footnote{R. Prentner, M. Quack, J. Stohner and M. Willeke, textit{J. Phys. Chem. A} textbf{119}, 12805-12822 (2015).}footnote {S. Albert, Z. Chen, C. F'{a}bri, R. Prentner M. Quack and D. Zindel, paper at this meeting.} Deuterated phenols have been identified as prototypical achrial candidates.footnote{S. Albert, Ph. Lerch, R. Prentner and M. Quack, textit{Angew. Chem. Int. Ed.} textbf{52}, 346-349 (2013).} We report the high resolution spectroscopic investigation of the ortho-D-phenol in the GHz and THz ranges following our recent discovery of tunneling switching in its isotopomer meta-D-phenol.footnote{label{myfootnote}S. Albert, Z. Chen, C. F'{a}bri,P. Lerch, R. Prentner and M. Quack, emph{Mol.Phys.} textbf{114}, 2751-2768 (2016) and emph{71st International Symposium on Molecular Spectroscopy}, Urbana-Champaign, USA, June 20-24, Talk FE04 (2016).} Here we report new results on ortho-D-phenol.The pure rotational spectra were recorded in the range of 72-117 GHz and assigned to the syn- and anti- structures in the ground and the first excited torsional states. Specific torsional states were assigned based on a comparison of experimental rotational constants with the quasiadiabatic channel reaction path Hamiltonian (RPH) calculations. The torsional fundamental at ~308 cm and the first hot band at 275 cm were subsequently assigned. The analyses of pure rotational and rovibrational spectra shall be discussed in detail in relation to possible tunneling switching
Parity Violation in Chiral Molecules: From Theory towards Spectroscopic Experiment and the Evolution of Biomolecular Homochirality
No full textWe shall start with an introductory discussion of three fundamental questions relating physics to molecular quantum dynamics and stereochemistry.
(i) To what extent are the fundamental symmetries and conservation laws of physics and their violations reflected in molecular quantum dynamics and spectroscopy, in general?
(ii) How important is parity violation for the quantum dynamics and spectroscopy of chiral molecules, in particular?
(iii) How important is parity violation for biomolecular homochirality, i.e. the quasi exclusive preference of L-amino acids and D-sugars in the biopolymers of life (proteins and DNA)?
The observation of biomolecular homochirality can be considered as a quasi-fossil of the evolution of life [1], the interpretation of which has been an open question for more than a century, with numerous related hypotheses, but no definitive answers. We shall briefly discuss the current status and the relation to the other two questions.
The discovery of parity violation led to important developments of physics in the 20th century and is understood within the standard model of particle physics, SMPP. For molecular stereochemistry it leads to the surprising prediction of a small energy difference D of the ground state energies of the enantiomers of chiral molecules, corresponding to a small reaction enthalpy for the stereomutation between the R and S enantiomers [2].This reaction enthalpy would be exactly zero by symmetry with exact parity conservation. Theory predicts D to be in the sub-femto eV range, typically, depending on the molecule (about D= 100 aeV for ClSSCl or CHFClBr, corresponding to a reaction enthalpy of about 10 pJ/mol). We have outlined three decades ago, how this small energy difference D might by measured by spectroscopic experiment [3], and recent progress indicates that experiment might be successful in the near future [4-8]. We shall discuss the current status of our experiments including alternatives pursued in other groups and the possible consequences for our understanding of molecular and biomolecular chirality.For background reading see [1-7].
1. M. Quack, Adv. Chem. Phys., 2014, 157, 249-290, Chapter 18.
2. M. Quack, Fundamental Symmetries and Symmetry Violations from High Resolution Spectroscopy, in Handbook of High Resolution Spectroscopy, Vol. 1, Chapt. 18, pp. 659-722 (Eds.: M. Quack, F. Merkt), Wiley, Chichester, New York, 2011
3. M. Quack, Chem. Phys. Lett., 1986, 132, 147-153.
4. P. Dietiker, E. Miloglyadov, M. Quack, A. Schneider, G. Seyfang, J. Chem. Phys., 2015, 143, 244305, (and references cited therein).
5. R.Prentner, M. Quack, J. Stohner, M. Willeke, J. Phys. Chem. A, 2015, 119, 12805-22.
6. C. Fábri, Ľ. Horný, M. Quack, ChemPhysChem, 2015, 16, 3584–3589.
7. S. Albert, I. Bolotova, Z. Chen, C. Fábri, L. Horný, M. Quack, G. Seyfang, D. Zindel, Phys. Chem. Chem. Phys., 2016, 18, 21976-21993. A.Albert, F.Arn,I.Bolotova,Z.Chen, C.Fabri, G.Grassi, P.Lerch, M.Quack, G.Seyfang, A.Wokaun, D. Zindel, J.Phys.Chem. Lett. 2016, 7, 3847-385
Transnational Communities: Shaping Global Economic Governance
No full textTransnational communities are social groups that emerge from mutual interaction across national boundaries, oriented around a common project or 'imagined' identity. This common project or identity is constructed and sustained through the active engagement and involvement of at least some of its members. Such communities can overlap in different ways with formal organizations but, in principle, they do not need formal organization to be sustained. This book explores the role of transnational communities in relation to the governance of business and economic activity. It does so by focusing on a wide range of empirical terrains, including discussions of the Laleli market in Istanbul, the institutionalization of private equity in Japan, the transnational movement for open content licenses, and the mobilization around environmental certification. These studies show that transnational communities can align the cognitive and normative orientations of their members over time and thereby influence emergent transnational governance arrangements.List of figures page List of tables List of appendices Notes on contributors Preface Part I Introduction Transnational communities and governance Marie-Laure Djelic and Sigrid Quack Global structures: markets, organizations, networks – and communities? Renate Mayntz Part II Classical communities with a transnational extension The multiple layers of a transnational “imagined community”: the notion and reality of the ethnic Chinese business community Heidi Dahles From cross-border exchange networks to transnational trading practices? The case of shuttle traders in Laleli, Istanbul Mine Eder and Özlem Öz Part III Professional communities with a transnational extension Transnational boards and governance regimes: a Franco-British comparison Charles Harvey and Mairi Maclean Private equity in Japan: global financial markets and transnational communities Glenn Morgan and Izumi Kubo Formal organizing and transnational communities: evidence from global finance governance associations, 1879–2006 Asma A. Hussain and Marc J. Ventresca Promoting transnational professionalism: forays of the “Big Firm” accounting community into France Carlos Ramirez Part IV Virtual communities Gift-giving, transnational communities, and skill-building in developing countries: the case of free/open source software Anca Metiu Epistemic communities and social movements: transnational dynamics in the case of Creative Commons Leonhard Dobusch and Sigrid Quack Part V Transnational interest- or issue-based communities The transnational temperance community Mark Lawrence Schrad Industrial democracy in the European Community: trade unions as a defensive transnational community, 1968–1988 Thomas Fetzer The making of a comprehensive transnational discourse community Dieter Plehwe Global warming, transnational communities, and economic entrepreneurship: the case of carbon capture and storage (CCS) Åge Mariussen Communities of practice as cause and consequence of transnational governance: the evolution of social and environmental certification Tim Bartley and Shawna N. Smith Part VI Conclusion Transnational communities and their impact on the governance of business and economic activity Marie-Laure Djelic and Sigrid Quack Inde
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