Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Jean Ann Wyer"'
Autor:
Mads Bejder Kristensen, Jean Ann Wyer, Søren Vrønning Hoffmann, Steen Brøndsted Nielsen, Nykola C. Jones
Publikováno v:
Wyer, J A, Kristensen, M B, Jones, N C, Hoffmann, S V & Nielsen, S B 2014, ' Kinetics of DNA duplex formation: A-tracts versus AT-tracts ', Physical Chemistry Chemical Physics, vol. 16, no. 35, pp. 18827-18839 . https://doi.org/10.1039/c4cp02252a
The hybridisation and melting of DNA strands are critical steps in many biological processes, but still a deeper understanding of the kinetics is lacking. This is evident from the absence of a clear correlation between rate constants for duplex forma
Publikováno v:
Wyer, J A, Jørgensen, A, Pedersen, B & Nielsen, S B 2013, ' Gas-phase spectroscopy of ferric heme-NO complexes ', ChemPhysChem, vol. 14, no. 18, pp. 4109-4113 . https://doi.org/10.1002/cphc.201300843
Weakly bound complexes between ferric heme cations and NO were synthesised in the gas phase from ion-molecule reactions, and their absorption measured based on photodissociation yields. The Soret band, which serves as an important marker band for hem
Publikováno v:
Wyer, J A, Byskov, C S & Nielsen, S B 2011, ' Gas-phase action spectroscopy of protoporphyrin IX (PP) and zinc-PP anions from 210 nm to 720 nm ', International Journal of Mass Spectrometry, vol. 308, no. 1, pp. 126-132 . https://doi.org/10.1016/j.ijms.2011.08.015
Wyer, J A, Jensen, C S & Brøndsted Nielsen, S 2011, ' Gas-phase action spectroscopy of protoporphyrin IX (PP) and zinc-PP anions from 210 nm to 720 nm ', International Journal of Mass Spectrometry, vol. 308, no. 1, pp. 126-132 . https://doi.org/10.1016/j.ijms.2011.08.015
Wyer, J A, Jensen, C S & Brøndsted Nielsen, S 2011, ' Gas-phase action spectroscopy of protoporphyrin IX (PP) and zinc-PP anions from 210 nm to 720 nm ', International Journal of Mass Spectrometry, vol. 308, no. 1, pp. 126-132 . https://doi.org/10.1016/j.ijms.2011.08.015
Action spectra of isolated gas-phase protoporphyrin IX (PP) and zinc-PP anions are presented here. Such spectra are valuable for protein biospectroscopy as absorption by proteins is often determined by the chromophores microenvironment which is often
Autor:
Steen Brøndsted Nielsen, Christopher L. Moss, Preben Hvelplund, Jean Ann Wyer, Thomas W. Chung, František Tureček
Publikováno v:
Moss, C L, Chung, T W, Wyer, J, Nielsen, S B, Hvelplund, P & Turecek, F 2011, ' Dipole-Guided Electron Capture Causes Abnormal Dissociations of Phosphorylated Pentapeptides ', Journal of The American Society for Mass Spectrometry, vol. 22, pp. 731-751 . https://doi.org/10.1007/s13361-011-0083-2
Electron transfer and capture mass spectra of a series of doubly charged ions that were phosphorylated pentapeptides of a tryptic type (pS,A,A,A,R) showed conspicuous differences in dissociations of charge-reduced ions. Electron transfer from both ga
Autor:
Christian Nygaard Hansen, Jean Ann Wyer, Mads Bejder Kristensen, Maj-Britt Suhr Kirketerp, Steen Brøndsted Nielsen, Kristian Støchkel
Publikováno v:
Chemical Physics Letters. 502:53-56
Tetrathiocyanoplatinate(II), Pt ( SCN ) 4 2 - , isolated in vacuo was subjected to a range of experiments. From storage ring measurements the dianions were found to be stable on the seconds time scale. At another instrumental setup, ions were photoex
Autor:
Anneli Ehlerding, Maj-Britt Suhr Kirketerp, Henning Zettergren, Steen Brøndsted Nielsen, Jean Ann Wyer
Publikováno v:
Ehlerding, A, Wyer, J, Zettergren, H, Kirketerp, M-B S & Nielsen, S B 2010, ' UV Photodissociation of protonated Gly-Trp and Trp-Gly Dipeptides and Their Complexes with Crown Ether in an Electrostatic Ion Storage Ring ', Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, vol. 114, pp. 299-303 . https://doi.org/10.1021/jp9086317
Photodissociation of protonated GW, WG (G = glycine, W = tryptophan), and their complexes with 18-crown-6-ether (CE) was performed in an electrostatic ion storage ring using a tunable laser system. On the basis of lifetime measurements, action spectr
Autor:
Jean Ann Wyer, Umesh Kadhane, Anneli Ehlerding, Henning Zettergren, Bruno Lucas, Maj-Britt Suhr Kirketerp, J. A. Fayeton, S. Brøndsted Nielsen, Christophe Jouvet, M. Pérot, Michel Barat
Publikováno v:
Kadhane, U, Pérot, M, Lucas, B, Barat, M, Fayeton, J A, Jouvet, C, Ehlerding, A, Kirketerp, M-B S, Nielsen, S B, Wyer, J & Zettergren, H 2009, ' Photodissociation of protonated tryptamine and its supramolecular complex with 18-crown-6 ether: Dissociation times and channels, absorption spectra, and excited states calculations ', Chemical Physics Letters, vol. 480, no. 1-3, pp. 57-61 . https://doi.org/10.1016/j.cplett.2009.08.064
Photodissociation of the complex between protonated tryptamine, TryH + , and 18-crown-6 ether (CE) was investigated. Absorption maxima of TryH + and TryH + (CE) are at 249 and 273 nm, respectively. Ions decay exponentially on a microsecond timescale,
Autor:
Steen Brøndsted Nielsen, Jean Ann Wyer
This book provides a concise overview of the photophysics and spectroscopy of bio chromophore ions. The book'Photophysics of Ionic Biochromophores'summarizes important recent advances in the spectroscopy of isolated biomolecular ions in vacuo, which
Autor:
Steen Brøndsted Nielsen, Jean Ann Wyer
Publikováno v:
Nielsen, S B & Wyer, J 2013, General Concepts . in S B Nielsen & J A Wyer (eds), Photophysics of Ionic Biochromophores . Springer, Physical Chemistry in Action, pp. 1-10 . https://doi.org/10.1007/978-3-642-40190-9_1
Photophysics of Ionic Biochromophores ISBN: 9783642401893
Photophysics of Ionic Biochromophores ISBN: 9783642401893
An ion with mass m, charge q and velocity v that encounters an electromagnetic field, composed of an electric field E and/or a magnetic field B, will experience the Lorentz force F = q(E + v × B). For both electrostatic parallel plate and cylindrica
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d939b1ad4371ba40fa180a1b4544a9e1
https://pure.au.dk/portal/da/publications/general-concepts(23a9a55c-ed14-4d08-9298-c4bfdd78489f).html
https://pure.au.dk/portal/da/publications/general-concepts(23a9a55c-ed14-4d08-9298-c4bfdd78489f).html
Autor:
Jean Ann Wyer, Steen Brøndsted Nielsen
Publikováno v:
Wyer, J & Nielsen, S B 2013, Spectroscopy of Ferric Heme and Protoporphyrin IX Ions In Vacuo . in S B Nielsen & J A Wyer (eds), Photophysics of Ionic Biochromophores . Springer, Physical Chemistry in Action, pp. 117-139 . https://doi.org/10.1007/978-3-642-40190-9_7
Photophysics of Ionic Biochromophores ISBN: 9783642401893
Photophysics of Ionic Biochromophores ISBN: 9783642401893
This chapter deals with gas-phase spectroscopy of protoporphyrin IX and heme ions, two important biochromophores in nature. These ions strongly absorb blue and green light, which accounts for e.g. the red colour of blood. We present absorption spectr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::12ec67980e6e6cd62cee9588db37e9a2
https://pure.au.dk/portal/da/publications/spectroscopy-of-ferric-heme-and-protoporphyrin-ix-ions-in-vacuo(6d87d788-9983-4f39-ab41-eca9369a56b4).html
https://pure.au.dk/portal/da/publications/spectroscopy-of-ferric-heme-and-protoporphyrin-ix-ions-in-vacuo(6d87d788-9983-4f39-ab41-eca9369a56b4).html