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Chevalier F, Schlathölter T, Poully JC. Radiation-Induced Transfer of Charge, Atoms, and Energy within Isolated Biomolecular Systems. Chembiochem 2023; 24:e202300543. [PMID: 37712497 DOI: 10.1002/cbic.202300543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 09/12/2023] [Accepted: 09/14/2023] [Indexed: 09/16/2023]
Abstract
In biological tissues, ionizing radiation interacts with a variety of molecules and the consequences include cell killing and the modification of mechanical properties. Applications of biological radiation action are for instance radiotherapy, sterilization, or the tailoring of biomaterial properties. During the first femtoseconds to milliseconds after the initial radiation action, biomolecular systems typically respond by transfer of charge, atoms, or energy. In the condensed phase, it is usually very difficult to distinguish direct effects from indirect effects. A straightforward solution for this problem is the use of gas-phase techniques, for instance from the field of mass spectrometry. In this review, we survey mainly experimental but also theoretical work, focusing on radiation-induced intra- and inter-molecular transfer of charge, atoms, and energy within biomolecular systems in the gas phase. Building blocks of DNA, proteins, and saccharides, but also antibiotics are considered. The emergence of general processes as well as their timescales and mechanisms are highlighted.
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Affiliation(s)
- François Chevalier
- CIMAP UMR 6252, CEA/CNRS/ENSICAEN/Université de Caen Normandie, Bd Becquerel, 14070, Caen, France
| | - Thomas Schlathölter
- Zernike Institute for Advanced Materials, University of Groningen, Groningen (The, Netherlands
- University College Groningen, University of Groningen, Groningen (The, Netherlands
| | - Jean-Christophe Poully
- CIMAP UMR 6252, CEA/CNRS/ENSICAEN/Université de Caen Normandie, Bd Becquerel, 14070, Caen, France
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2
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Abdelmouleh M, Lalande M, El Feghaly J, Vizcaino V, Rebelo A, Eden S, Schlathölter T, Poully JC. Mass Spectral Signatures of Complex Post-Translational Modifications in Proteins: A Proof-of-Principle Based on X-ray Irradiated Vancomycin. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2020; 31:1738-1743. [PMID: 32551638 DOI: 10.1021/jasms.0c00169] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Characterizing post-translational modifications (PTM) of proteins is of key relevance for the understanding of many biological processes, as these covalent modifications strongly influence or even determine protein function. Among the different analytical techniques available, mass spectrometry is attracting growing attention because recent instrumental and computational improvements have led to a massive rise of the number of PTM sites that can be identified and quantified. However, multiple PTM occurring at adjacent amino acid residues can lead to complex and dense chemical patterns that are a challenge to characterize. By means of X-ray synchrotron radiation coupled to mass spectrometry, and through the test-case of the glycopeptide antibiotic vancomycin, we show that such a pattern has a unique and robust signature in terms of photon energy and molecular environment. This highlights the potential of this technique in proteomics and its value as a tool to understand the biological roles of PTM.
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Affiliation(s)
- Marwa Abdelmouleh
- CIMAP, UMR 6252 CEA/CNRS/ENSICAEN/Université de Caen Normandie, Bd Becquerel, 14070 Caen, France
| | - Mathieu Lalande
- CIMAP, UMR 6252 CEA/CNRS/ENSICAEN/Université de Caen Normandie, Bd Becquerel, 14070 Caen, France
| | - Johnny El Feghaly
- CIMAP, UMR 6252 CEA/CNRS/ENSICAEN/Université de Caen Normandie, Bd Becquerel, 14070 Caen, France
| | - Violaine Vizcaino
- CIMAP, UMR 6252 CEA/CNRS/ENSICAEN/Université de Caen Normandie, Bd Becquerel, 14070 Caen, France
| | - André Rebelo
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, U.K
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, FCT - Universidade NOVA de Lisboa, P-2829-516 Caparica, Portugal
| | - Samuel Eden
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, U.K
| | - Thomas Schlathölter
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, Netherlands
| | - Jean-Christophe Poully
- CIMAP, UMR 6252 CEA/CNRS/ENSICAEN/Université de Caen Normandie, Bd Becquerel, 14070 Caen, France
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3
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Li W, Mjekiqi E, Douma W, Wang X, Kavatsyuk O, Hoekstra R, Poully J, Schlathölter T. Hole Migration in Telomere-Based Oligonucleotide Anions and G-Quadruplexes. Chemistry 2019; 25:16114-16119. [PMID: 31614016 PMCID: PMC6972685 DOI: 10.1002/chem.201904105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 10/11/2019] [Indexed: 01/24/2023]
Abstract
Vacuum ultraviolet photoionization of a gas-phase oligonucleotide anion leads to the formation of a valence hole. This hole migrates towards an energetically favorable site where it can weaken bonds and ultimately lead to bond cleavage. We have studied Vacuum UV photoionization of deprotonated oligonucleotides containing the human telomere sequence dTTAGGG and G-quadruplex structures consisting of four dTGGGGT single strands, stabilized by NH4 + counter ions. The oligonucleotide and G-quadruplex anions were confined in a radiofrequency ion trap, interfaced with a synchrotron beamline and the photofragmentation was studied using time-of-flight mass spectrometry. Oligonucleotide 12-mers containing the 5'-TTAGGG sequence were found to predominantly break in the GGG region, whereas no selective bond cleavage region was observed for the reversed 5'-GGGATT sequence. For G-quadruplex structures, fragmentation was quenched and mostly non-dissociative single and double electron removal was observed.
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Affiliation(s)
- Wen Li
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
| | - Edita Mjekiqi
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
| | - Wessel Douma
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
| | - Xin Wang
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
| | - Oksana Kavatsyuk
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
- University College GroningenUniversity of GroningenHoendiepskade 23/249718 BGGroningenThe Netherlands
| | - Ronnie Hoekstra
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
| | - Jean‐Christophe Poully
- CIMAP laboratory UMR 6252Université de Caen Normandie/CEA/CNRS/ENSICAENBd Becquerel14070CAEN Cedex 5France
| | - Thomas Schlathölter
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747AGGroningenThe Netherlands
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4
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Erdmann E, Bacchus-Montabonel MC, Łabuda M. Modelling charge transfer processes in C 2+-tetrahydrofuran collision for ion-induced radiation damage in DNA building blocks. Phys Chem Chem Phys 2017; 19:19722-19732. [PMID: 28540940 DOI: 10.1039/c7cp02100c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Investigations of collision-induced processes involving carbon ions and molecules of biological interest, in particular DNA building blocks, are crucial to model the effect of radiation on cells in order to improve medical treatments for cancer therapy. Using carbon ions appears to be one of the most efficient ways to increase biological effectiveness to damage cancerous cells by irradiating deep-seated tumors. Therefore, interest in accurate calculations to understand fundamental processes occurring in ion-molecule collision systems has been growing recently. In this context, the charge transfer process in the collision of C2+(1s22s2) ions with the heterocyclic sugar moiety building block tetrahydrofuran (THF) was studied in order to interpret the mechanisms occurring at the molecular level. The molecular structure properties of THF were obtained by means of ab initio quantum chemistry methods. The role of the conformational structure and the orientation of the THF molecule in collision with C2+ ions are particularly discussed. Anisotropic effects of the process dynamics in the collision energy ranging from eV to keV by means of semiclassical treatment are also presented and compared to previous experimental and theoretical investigations. A detailed analysis of the obtained cross sections points out an increase in these values by three orders of magnitude by a change of the THF symmetry from C2v to Cs in collision with C2+, which determines a more efficient charge transfer in this case.
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Affiliation(s)
- Ewa Erdmann
- Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland.
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5
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Dampc M, Mielewska B, Siggel-King MR, King GC, Zubek M. A study of the photoelectron spectra of α-tetrahydrofurfuryl alcohol over the outer valence energy region (9–25 eV). Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.04.084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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6
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Chen J, Cao M, Wei B, Ding M, Shan X, Liu F, Sheng L. Vacuum ultraviolet photoionization mass spectrometric study of cyclohexene. JOURNAL OF MASS SPECTROMETRY : JMS 2016; 51:169-181. [PMID: 26889934 DOI: 10.1002/jms.3743] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 12/03/2015] [Accepted: 12/16/2015] [Indexed: 06/05/2023]
Abstract
In this work, photoionization and dissociation of cyclohexene have been studied by means of coupling a reflectron time-of-flight mass spectrometer with the tunable vacuum ultraviolet (VUV) synchrotron radiation. The adiabatic ionization energy of cyclohexene as well as the appearance energies of its fragment ions C6 H9 (+) , C6 H7 (+) , C5 H7 (+) , C5 H5 (+) , C4 H6 (+) , C4 H5 (+) , C3 H5 (+) and C3 H3 (+) were derived from the onset of the photoionization efficiency (PIE) curves. The optimized structures for the transition states and intermediates on the ground state potential energy surfaces related to photodissociation of cyclohexene were characterized at the ωB97X-D/6-31+g(d,p) level. The coupled cluster method, CCSD(T)/cc-pVTZ, was employed to calculate the corresponding energies with the zero-point energy corrections by the ωB97X-D/6-31+g(d,p) approach. Combining experimental and theoretical results, possible formation pathways of the fragment ions were proposed and discussed in detail. The retro-Cope rearrangement was found to play a crucial role in the formation of C4 H6 (+) , C4 H5 (+) and C3 H5 (+) . Intramolecular hydrogen migrations were observed as dominant processes in most of the fragmentation pathways of cyclohexene. The present research provides a clear picture of the photoionization and dissociation processes of cyclohexene in the 8- to 15.5-eV photon energy region.
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Affiliation(s)
- Jun Chen
- National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230029, China
| | - Maoqi Cao
- Department of Chemistry, Qian Nan Normal College for Nationalities, Duyun, 558000, Guizhou, China
| | - Bin Wei
- National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230029, China
| | - Mengmeng Ding
- National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230029, China
| | - Xiaobin Shan
- National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230029, China
| | - Fuyi Liu
- National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230029, China
| | - Liusi Sheng
- National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230029, China
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7
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Shin JW, Bernstein ER. Vacuum ultraviolet photoionization of carbohydrates and nucleotides. J Chem Phys 2015; 140:044330. [PMID: 25669546 DOI: 10.1063/1.4862829] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Carbohydrates (2-deoxyribose, ribose, and xylose) and nucleotides (adenosine-, cytidine-, guanosine-, and uridine-5(')-monophosphate) are generated in the gas phase, and ionized with vacuum ultraviolet photons (VUV, 118.2 nm). The observed time of flight mass spectra of the carbohydrate fragmentation are similar to those observed [J.-W. Shin, F. Dong, M. Grisham, J. J. Rocca, and E. R. Bernstein, Chem. Phys. Lett. 506, 161 (2011)] for 46.9 nm photon ionization, but with more intensity in higher mass fragment ions. The tendency of carbohydrate ions to fragment extensively following ionization seemingly suggests that nucleic acids might undergo radiation damage as a result of carbohydrate, rather than nucleobase fragmentation. VUV photoionization of nucleotides (monophosphate-carbohydrate-nucleobase), however, shows that the carbohydrate-nucleobase bond is the primary fragmentation site for these species. Density functional theory (DFT) calculations indicate that the removed carbohydrate electrons by the 118.2 nm photons are associated with endocyclic C-C and C-O ring centered orbitals: loss of electron density in the ring bonds of the nascent ion can thus account for the observed fragmentation patterns following carbohydrate ionization. DFT calculations also indicate that electrons removed from nucleotides under these same conditions are associated with orbitals involved with the nucleobase-saccharide linkage electron density. The calculations give a general mechanism and explanation of the experimental results.
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Affiliation(s)
- Joong-Won Shin
- Division of Science, Governors State University, University Park, Illinois 60484-0975, USA
| | - Elliot R Bernstein
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, USA
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8
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Nováková E, Vyšín L, Burian T, Juha L, Davídková M, Múčka V, Čuba V, Grisham ME, Heinbuch S, Rocca JJ. Breaking DNA strands by extreme-ultraviolet laser pulses in vacuum. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 91:042718. [PMID: 25974538 DOI: 10.1103/physreve.91.042718] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2015] [Indexed: 06/04/2023]
Abstract
Ionizing radiation induces a variety of DNA damages including single-strand breaks (SSBs), double-strand breaks (DSBs), abasic sites, modified sugars, and bases. Most theoretical and experimental studies have been focused on DNA strand scissions, in particular production of DNA double-strand breaks. DSBs have been proven to be a key damage at a molecular level responsible for the formation of chromosomal aberrations, leading often to cell death. We have studied the nature of DNA damage induced directly by the pulsed 46.9-nm (26.5 eV) radiation provided by an extreme ultraviolet (XUV) capillary-discharge Ne-like Ar laser (CDL). Doses up to 45 kGy were delivered with a repetition rate of 3 Hz. We studied the dependence of the yield of SSBs and DSBs of a simple model of DNA molecule (pBR322) on the CDL pulse fluence. Agarose gel electrophoresis method was used for determination of both SSB and DSB yields. The action cross sections of the single- and double-strand breaks of pBR322 plasmid DNA in solid state were determined. We observed an increase in the efficiency of strand-break induction in the supercoiled DNA as a function of laser pulse fluence. Results are compared to those acquired at synchrotron radiation facilities and other sources of extreme-ultraviolet and soft x-ray radiation.
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Affiliation(s)
- Eva Nováková
- Department of Radiation and Chemical Physics, Institute of Physics CAS, Na Slovance 2, Prague 8, 182 21, Czech Republic
| | - Luděk Vyšín
- Department of Radiation and Chemical Physics, Institute of Physics CAS, Na Slovance 2, Prague 8, 182 21, Czech Republic
- Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, Prague 1, 115 19, Czech Republic
| | - Tomáš Burian
- Department of Radiation and Chemical Physics, Institute of Physics CAS, Na Slovance 2, Prague 8, 182 21, Czech Republic
| | - Libor Juha
- Department of Radiation and Chemical Physics, Institute of Physics CAS, Na Slovance 2, Prague 8, 182 21, Czech Republic
| | - Marie Davídková
- Department of Radiation Dosimetry, Institute of Nuclear Physics CAS, Na Truhlářce 39/64, Prague 8, 180 86, Czech Republic
| | - Viliam Múčka
- Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, Prague 1, 115 19, Czech Republic
| | - Václav Čuba
- Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, Prague 1, 115 19, Czech Republic
| | - Michael E Grisham
- NSF ERC for Extreme Ultraviolet Science and Technology, Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, Colorado 80523-1373, USA
| | - Scott Heinbuch
- NSF ERC for Extreme Ultraviolet Science and Technology, Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, Colorado 80523-1373, USA
| | - Jorge J Rocca
- NSF ERC for Extreme Ultraviolet Science and Technology, Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, Colorado 80523-1373, USA
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9
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Limão-Vieira P, Duflot D, Hubin-Franskin MJ, Delwiche J, Hoffmann SV, Chiari L, Jones DB, Brunger MJ, Lopes MCA. Electronic states of tetrahydrofurfuryl alcohol (THFA) as studied by VUV spectroscopy and ab initio calculations. J Phys Chem A 2014; 118:6425-34. [PMID: 24742321 DOI: 10.1021/jp501634w] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The electronic spectroscopy of isolated tetrahydrofurfuryl alcohol (THFA) in the gas phase has been investigated using high-resolution photoabsorption spectroscopy in the 5.0-10.8 eV energy-range, with absolute cross-section measurements derived. The He(I) photoelectron spectrum was also collected to quantify ionization energies in the 9-16 eV spectral region. These experiments are supported by the first high-level ab initio calculations performed on the excited states of the neutral molecule and on the ground and excited state of the positive ion. The good agreement between the theoretical results and the measurements allows us to quantify for the first time the electronic-state spectroscopy of THFA. The present work also considers the question of the lowest energy conformers of the molecule and its population distribution at room temperature.
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Affiliation(s)
- P Limão-Vieira
- Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa , 2829-516 Caparica, Portugal
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10
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Lin YS, Lin SY, Lee YT, Tseng CM, Ni CK, Liu CL, Tsai CC, Chen JL, Hu WP. Core Excitation, Specific Dissociation, and the Effect of the Size of Aromatic Molecules Connected to Oxygen: Phenyl Ether and 1,3-Diphenoxybenzene. J Phys Chem A 2014; 118:7803-15. [DOI: 10.1021/jp505949d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yi-Shiue Lin
- Scientific
Research Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Shu-Yu Lin
- Scientific
Research Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
- Institute
of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 10617, Taiwan
| | - Yuan T. Lee
- Institute
of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 10617, Taiwan
| | - Chien-Ming Tseng
- Department
of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Chi-Kung Ni
- Institute
of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 10617, Taiwan
- Department
of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Chen-Lin Liu
- Scientific
Research Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Cheng-Cheng Tsai
- Department
of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi 62102, Taiwan
| | - Jien-Lian Chen
- Department
of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi 62102, Taiwan
| | - Wei-Ping Hu
- Department
of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi 62102, Taiwan
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11
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Lin YS, Lu KT, Lee YT, Tseng CM, Ni CK, Liu CL. Near-Edge X-ray Absorption Fine Structure Spectra and Site-Selective Dissociation of Phenol. J Phys Chem A 2014; 118:1601-9. [DOI: 10.1021/jp500284r] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yi-Shiue Lin
- Scientific
Research Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Kun-Ta Lu
- Scientific
Research Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Yuan T. Lee
- Institute of Atomic
and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
| | - Chien-Ming Tseng
- Department
of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Chi-Kung Ni
- Institute of Atomic
and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
- Department
of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Chen-Lin Liu
- Scientific
Research Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
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12
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Tuna D, Sobolewski AL, Domcke W. Electronically excited states and photochemical reaction mechanisms of β-glucose. Phys Chem Chem Phys 2014; 16:38-47. [DOI: 10.1039/c3cp52359d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Horneck G, Moeller R, Cadet J, Douki T, Mancinelli RL, Nicholson WL, Panitz C, Rabbow E, Rettberg P, Spry A, Stackebrandt E, Vaishampayan P, Venkateswaran KJ. Resistance of bacterial endospores to outer space for planetary protection purposes--experiment PROTECT of the EXPOSE-E mission. ASTROBIOLOGY 2012; 12:445-56. [PMID: 22680691 PMCID: PMC3371261 DOI: 10.1089/ast.2011.0737] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Spore-forming bacteria are of particular concern in the context of planetary protection because their tough endospores may withstand certain sterilization procedures as well as the harsh environments of outer space or planetary surfaces. To test their hardiness on a hypothetical mission to Mars, spores of Bacillus subtilis 168 and Bacillus pumilus SAFR-032 were exposed for 1.5 years to selected parameters of space in the experiment PROTECT during the EXPOSE-E mission on board the International Space Station. Mounted as dry layers on spacecraft-qualified aluminum coupons, the "trip to Mars" spores experienced space vacuum, cosmic and extraterrestrial solar radiation, and temperature fluctuations, whereas the "stay on Mars" spores were subjected to a simulated martian environment that included atmospheric pressure and composition, and UV and cosmic radiation. The survival of spores from both assays was determined after retrieval. It was clearly shown that solar extraterrestrial UV radiation (λ≥110 nm) as well as the martian UV spectrum (λ≥200 nm) was the most deleterious factor applied; in some samples only a few survivors were recovered from spores exposed in monolayers. Spores in multilayers survived better by several orders of magnitude. All other environmental parameters encountered by the "trip to Mars" or "stay on Mars" spores did little harm to the spores, which showed about 50% survival or more. The data demonstrate the high chance of survival of spores on a Mars mission, if protected against solar irradiation. These results will have implications for planetary protection considerations.
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Affiliation(s)
- Gerda Horneck
- Radiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany.
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14
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Ghosh D, Golan A, Takahashi LK, Krylov AI, Ahmed M. A VUV Photoionization and Ab Initio Determination of the Ionization Energy of a Gas-Phase Sugar (Deoxyribose). J Phys Chem Lett 2012; 3:97-101. [PMID: 26701259 DOI: 10.1021/jz201446r] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The ionization energy of gas-phase deoxyribose was determined using tunable vacuum ultraviolet synchrotron radiation coupled to an effusive thermal source. Adiabatic and vertical ionization energies of the ground and first four excited states of α-pyranose, the structure that dominates in the gas phase, were calculated using high-level electronic structure methods. An appearance energy of 9.1(±0.05) eV was recorded, which agrees reasonably well with a theoretical value of 8.8 eV for the adiabatic ionization energy. A clear picture of the dissociative photoionization dynamics of deoxyribose emerges from the fragmentation pattern recorded using mass spectrometry and from ab initio molecular dynamics calculations. The experimental threshold 9.4 (±0.05) eV for neutral water elimination upon ionization is captured well in the calculations, and qualitative insights are provided by molecular orbital analysis and molecular dynamics snapshots along the reaction coordinate.
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Affiliation(s)
- Debashree Ghosh
- Department of Chemistry, University of Southern California , Los Angeles, California 90089-0482, United States
| | - Amir Golan
- Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - Lynelle K Takahashi
- Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
- Department of Chemistry, University of California at Berkeley , Berkeley, California 94720, United States
| | - Anna I Krylov
- Department of Chemistry, University of Southern California , Los Angeles, California 90089-0482, United States
| | - Musahid Ahmed
- Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
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15
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Hemberger P, Bodi A, Schon C, Steinbauer M, Fischer KH, Kaiser C, Fischer I. A pass too far: dissociation of internal energy selected paracyclophane cations, theory and experiment. Phys Chem Chem Phys 2012; 14:11920-9. [DOI: 10.1039/c2cp40905d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Shin JW, Dong F, Grisham ME, Rocca JJ, Bernstein ER. Extreme ultraviolet photoionization of aldoses and ketoses. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.03.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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