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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">X-ray-induced photo-chemistry and X-ray absorption spectroscopy of biological samples</title><author><name sortKey="George, Graham N" sort="George, Graham N" uniqKey="George G" first="Graham N." last="George">Graham N. George</name><affiliation><nlm:aff id="a">Department of Geological Sciences,<institution>University of Saskatchewan</institution>, Saskatoon, Saskatchewan,<country>Canada</country> S7N 5E2</nlm:aff></affiliation></author><author><name sortKey="Pickering, Ingrid J" sort="Pickering, Ingrid J" uniqKey="Pickering I" first="Ingrid J." last="Pickering">Ingrid J. Pickering</name><affiliation><nlm:aff id="a">Department of Geological Sciences,<institution>University of Saskatchewan</institution>, Saskatoon, Saskatchewan,<country>Canada</country> S7N 5E2</nlm:aff></affiliation></author><author><name sortKey="Pushie, M Jake" sort="Pushie, M Jake" uniqKey="Pushie M" first="M. Jake" last="Pushie">M. Jake Pushie</name><affiliation><nlm:aff id="a">Department of Geological Sciences,<institution>University of Saskatchewan</institution>, Saskatoon, Saskatchewan,<country>Canada</country> S7N 5E2</nlm:aff></affiliation></author><author><name sortKey="Nienaber, Kurt" sort="Nienaber, Kurt" uniqKey="Nienaber K" first="Kurt" last="Nienaber">Kurt Nienaber</name><affiliation><nlm:aff id="a">Department of Geological Sciences,<institution>University of Saskatchewan</institution>, Saskatoon, Saskatchewan,<country>Canada</country> S7N 5E2</nlm:aff></affiliation></author><author><name sortKey="Hackett, Mark J" sort="Hackett, Mark J" uniqKey="Hackett M" first="Mark J." last="Hackett">Mark J. Hackett</name><affiliation><nlm:aff id="a">Department of Geological Sciences,<institution>University of Saskatchewan</institution>, Saskatoon, Saskatchewan,<country>Canada</country> S7N 5E2</nlm:aff></affiliation></author><author><name sortKey="Ascone, Isabella" sort="Ascone, Isabella" uniqKey="Ascone I" first="Isabella" last="Ascone">Isabella Ascone</name><affiliation><nlm:aff id="b">ENSCP Chimie ParisTech,<institution>LCF, CNRS</institution>, UMR 7223, 75005 Paris,<country>France</country></nlm:aff></affiliation></author><author><name sortKey="Hedman, Britt" sort="Hedman, Britt" uniqKey="Hedman B" first="Britt" last="Hedman">Britt Hedman</name><affiliation><nlm:aff id="c">Department of Chemistry,<institution>Stanford University</institution>, Stanford, CA 94305,<country>USA</country></nlm:aff></affiliation><affiliation><nlm:aff id="d">Stanford Synchrotron Radiation Lightsource,<institution>SLAC National Accelerator Laboratory</institution>, Menlo Park, CA 94025,<country>USA</country></nlm:aff></affiliation></author><author><name sortKey="Hodgson, Keith O" sort="Hodgson, Keith O" uniqKey="Hodgson K" first="Keith O." last="Hodgson">Keith O. Hodgson</name><affiliation><nlm:aff id="c">Department of Chemistry,<institution>Stanford University</institution>, Stanford, CA 94305,<country>USA</country></nlm:aff></affiliation><affiliation><nlm:aff id="d">Stanford Synchrotron Radiation Lightsource,<institution>SLAC National Accelerator Laboratory</institution>, Menlo Park, CA 94025,<country>USA</country></nlm:aff></affiliation></author><author><name sortKey="Aitken, Jade B" sort="Aitken, Jade B" uniqKey="Aitken J" first="Jade B." last="Aitken">Jade B. Aitken</name><affiliation><nlm:aff id="e">School of Chemistry,<institution>The University of Sydney</institution>, Sydney, NSW 2006,<country>Australia</country></nlm:aff></affiliation><affiliation><nlm:aff id="f"><institution>Australian Synchrotron</institution>, Clayton, VIC 3168,<country>Australia</country></nlm:aff></affiliation><affiliation><nlm:aff id="g">Institute of Materials Structure Science,<institution>KEK</institution>, Tsukuba, Ibaraki 305-0801,<country>Japan</country></nlm:aff></affiliation></author><author><name sortKey="Levina, Aviva" sort="Levina, Aviva" uniqKey="Levina A" first="Aviva" last="Levina">Aviva Levina</name><affiliation><nlm:aff id="e">School of Chemistry,<institution>The University of Sydney</institution>, Sydney, NSW 2006,<country>Australia</country></nlm:aff></affiliation></author><author><name sortKey="Glover, Christopher" sort="Glover, Christopher" uniqKey="Glover C" first="Christopher" last="Glover">Christopher Glover</name><affiliation><nlm:aff id="f"><institution>Australian Synchrotron</institution>, Clayton, VIC 3168,<country>Australia</country></nlm:aff></affiliation></author><author><name sortKey="Lay, Peter A" sort="Lay, Peter A" uniqKey="Lay P" first="Peter A." last="Lay">Peter A. Lay</name><affiliation><nlm:aff id="e">School of Chemistry,<institution>The University of Sydney</institution>, Sydney, NSW 2006,<country>Australia</country></nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">23093745</idno><idno type="pmc">3480274</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3480274</idno><idno type="RBID">PMC:3480274</idno><idno type="doi">10.1107/S090904951203943X</idno><date when="2012">2012</date><idno type="wicri:Area/Pmc/Corpus">001A10</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">001A10</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">X-ray-induced photo-chemistry and X-ray absorption spectroscopy of biological samples</title><author><name sortKey="George, Graham N" sort="George, Graham N" uniqKey="George G" first="Graham N." last="George">Graham N. George</name><affiliation><nlm:aff id="a">Department of Geological Sciences,<institution>University of Saskatchewan</institution>, Saskatoon, Saskatchewan,<country>Canada</country> S7N 5E2</nlm:aff></affiliation></author><author><name sortKey="Pickering, Ingrid J" sort="Pickering, Ingrid J" uniqKey="Pickering I" first="Ingrid J." last="Pickering">Ingrid J. Pickering</name><affiliation><nlm:aff id="a">Department of Geological Sciences,<institution>University of Saskatchewan</institution>, Saskatoon, Saskatchewan,<country>Canada</country> S7N 5E2</nlm:aff></affiliation></author><author><name sortKey="Pushie, M Jake" sort="Pushie, M Jake" uniqKey="Pushie M" first="M. Jake" last="Pushie">M. Jake Pushie</name><affiliation><nlm:aff id="a">Department of Geological Sciences,<institution>University of Saskatchewan</institution>, Saskatoon, Saskatchewan,<country>Canada</country> S7N 5E2</nlm:aff></affiliation></author><author><name sortKey="Nienaber, Kurt" sort="Nienaber, Kurt" uniqKey="Nienaber K" first="Kurt" last="Nienaber">Kurt Nienaber</name><affiliation><nlm:aff id="a">Department of Geological Sciences,<institution>University of Saskatchewan</institution>, Saskatoon, Saskatchewan,<country>Canada</country> S7N 5E2</nlm:aff></affiliation></author><author><name sortKey="Hackett, Mark J" sort="Hackett, Mark J" uniqKey="Hackett M" first="Mark J." last="Hackett">Mark J. Hackett</name><affiliation><nlm:aff id="a">Department of Geological Sciences,<institution>University of Saskatchewan</institution>, Saskatoon, Saskatchewan,<country>Canada</country> S7N 5E2</nlm:aff></affiliation></author><author><name sortKey="Ascone, Isabella" sort="Ascone, Isabella" uniqKey="Ascone I" first="Isabella" last="Ascone">Isabella Ascone</name><affiliation><nlm:aff id="b">ENSCP Chimie ParisTech,<institution>LCF, CNRS</institution>, UMR 7223, 75005 Paris,<country>France</country></nlm:aff></affiliation></author><author><name sortKey="Hedman, Britt" sort="Hedman, Britt" uniqKey="Hedman B" first="Britt" last="Hedman">Britt Hedman</name><affiliation><nlm:aff id="c">Department of Chemistry,<institution>Stanford University</institution>, Stanford, CA 94305,<country>USA</country></nlm:aff></affiliation><affiliation><nlm:aff id="d">Stanford Synchrotron Radiation Lightsource,<institution>SLAC National Accelerator Laboratory</institution>, Menlo Park, CA 94025,<country>USA</country></nlm:aff></affiliation></author><author><name sortKey="Hodgson, Keith O" sort="Hodgson, Keith O" uniqKey="Hodgson K" first="Keith O." last="Hodgson">Keith O. Hodgson</name><affiliation><nlm:aff id="c">Department of Chemistry,<institution>Stanford University</institution>, Stanford, CA 94305,<country>USA</country></nlm:aff></affiliation><affiliation><nlm:aff id="d">Stanford Synchrotron Radiation Lightsource,<institution>SLAC National Accelerator Laboratory</institution>, Menlo Park, CA 94025,<country>USA</country></nlm:aff></affiliation></author><author><name sortKey="Aitken, Jade B" sort="Aitken, Jade B" uniqKey="Aitken J" first="Jade B." last="Aitken">Jade B. Aitken</name><affiliation><nlm:aff id="e">School of Chemistry,<institution>The University of Sydney</institution>, Sydney, NSW 2006,<country>Australia</country></nlm:aff></affiliation><affiliation><nlm:aff id="f"><institution>Australian Synchrotron</institution>, Clayton, VIC 3168,<country>Australia</country></nlm:aff></affiliation><affiliation><nlm:aff id="g">Institute of Materials Structure Science,<institution>KEK</institution>, Tsukuba, Ibaraki 305-0801,<country>Japan</country></nlm:aff></affiliation></author><author><name sortKey="Levina, Aviva" sort="Levina, Aviva" uniqKey="Levina A" first="Aviva" last="Levina">Aviva Levina</name><affiliation><nlm:aff id="e">School of Chemistry,<institution>The University of Sydney</institution>, Sydney, NSW 2006,<country>Australia</country></nlm:aff></affiliation></author><author><name sortKey="Glover, Christopher" sort="Glover, Christopher" uniqKey="Glover C" first="Christopher" last="Glover">Christopher Glover</name><affiliation><nlm:aff id="f"><institution>Australian Synchrotron</institution>, Clayton, VIC 3168,<country>Australia</country></nlm:aff></affiliation></author><author><name sortKey="Lay, Peter A" sort="Lay, Peter A" uniqKey="Lay P" first="Peter A." last="Lay">Peter A. Lay</name><affiliation><nlm:aff id="e">School of Chemistry,<institution>The University of Sydney</institution>, Sydney, NSW 2006,<country>Australia</country></nlm:aff></affiliation></author></analytic><series><title level="j">Journal of Synchrotron Radiation</title><idno type="ISSN">0909-0495</idno><idno type="eISSN">1600-5775</idno><imprint><date when="2012">2012</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>X-ray-induced photo-chemistry of metal sites within biological molecules is a concern for X-ray absorption spectroscopy, X-ray crystallography and other techniques in which samples are illuminated with X-rays. The effects of X-ray-induced photo-chemistry are reviewed and the methods used to mitigate these in X-ray absorption spectroscopy are outlined.</p></div></front></TEI><pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">J Synchrotron Radiat</journal-id><journal-id journal-id-type="iso-abbrev">J Synchrotron Radiat</journal-id><journal-id journal-id-type="publisher-id">J. Synchrotron Rad.</journal-id><journal-title-group><journal-title>Journal of Synchrotron Radiation</journal-title></journal-title-group><issn pub-type="ppub">0909-0495</issn><issn pub-type="epub">1600-5775</issn><publisher><publisher-name>International Union of Crystallography</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">23093745</article-id><article-id pub-id-type="pmc">3480274</article-id><article-id pub-id-type="publisher-id">wa5040</article-id><article-id pub-id-type="doi">10.1107/S090904951203943X</article-id><article-id pub-id-type="coden">JSYRES</article-id><article-id pub-id-type="pii">S090904951203943X</article-id><article-categories><subj-group subj-group-type="heading"><subject>Q2xafs Workshop</subject></subj-group></article-categories><title-group><article-title>X-ray-induced photo-chemistry and X-ray absorption spectroscopy of biological samples</article-title><alt-title>Photo-chemistry and XAS of biological samples</alt-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>George</surname><given-names>Graham N.</given-names></name><xref ref-type="aff" rid="a">a</xref><xref ref-type="corresp" rid="cor">*</xref></contrib><contrib contrib-type="author"><name><surname>Pickering</surname><given-names>Ingrid J.</given-names></name><xref ref-type="aff" rid="a">a</xref><xref ref-type="corresp" rid="cor">*</xref></contrib><contrib contrib-type="author"><name><surname>Pushie</surname><given-names>M. Jake</given-names></name><xref ref-type="aff" rid="a">a</xref></contrib><contrib contrib-type="author"><name><surname>Nienaber</surname><given-names>Kurt</given-names></name><xref ref-type="aff" rid="a">a</xref></contrib><contrib contrib-type="author"><name><surname>Hackett</surname><given-names>Mark J.</given-names></name><xref ref-type="aff" rid="a">a</xref></contrib><contrib contrib-type="author"><name><surname>Ascone</surname><given-names>Isabella</given-names></name><xref ref-type="aff" rid="b">b</xref><xref ref-type="corresp" rid="cor">*</xref></contrib><contrib contrib-type="author"><name><surname>Hedman</surname><given-names>Britt</given-names></name><xref ref-type="aff" rid="c">c</xref><xref ref-type="aff" rid="d">d</xref><xref ref-type="corresp" rid="cor">*</xref></contrib><contrib contrib-type="author"><name><surname>Hodgson</surname><given-names>Keith O.</given-names></name><xref ref-type="aff" rid="c">c</xref><xref ref-type="aff" rid="d">d</xref><xref ref-type="corresp" rid="cor">*</xref></contrib><contrib contrib-type="author"><name><surname>Aitken</surname><given-names>Jade B.</given-names></name><xref ref-type="aff" rid="e">e</xref><xref ref-type="aff" rid="f">f</xref><xref ref-type="aff" rid="g">g</xref></contrib><contrib contrib-type="author"><name><surname>Levina</surname><given-names>Aviva</given-names></name><xref ref-type="aff" rid="e">e</xref></contrib><contrib contrib-type="author"><name><surname>Glover</surname><given-names>Christopher</given-names></name><xref ref-type="aff" rid="f">f</xref></contrib><contrib contrib-type="author"><name><surname>Lay</surname><given-names>Peter A.</given-names></name><xref ref-type="aff" rid="e">e</xref><xref ref-type="corresp" rid="cor">*</xref></contrib><aff id="a"><label>a</label>Department of Geological Sciences,<institution>University of Saskatchewan</institution>, Saskatoon, Saskatchewan,<country>Canada</country> S7N 5E2</aff><aff id="b"><label>b</label>ENSCP Chimie ParisTech,<institution>LCF, CNRS</institution>, UMR 7223, 75005 Paris,<country>France</country></aff><aff id="c"><label>c</label>Department of Chemistry,<institution>Stanford University</institution>, Stanford, CA 94305,<country>USA</country></aff><aff id="d"><label>d</label>Stanford Synchrotron Radiation Lightsource,<institution>SLAC National Accelerator Laboratory</institution>, Menlo Park, CA 94025,<country>USA</country></aff><aff id="e"><label>e</label>School of Chemistry,<institution>The University of Sydney</institution>, Sydney, NSW 2006,<country>Australia</country></aff><aff id="f"><label>f</label><institution>Australian Synchrotron</institution>, Clayton, VIC 3168,<country>Australia</country></aff><aff id="g"><label>g</label>Institute of Materials Structure Science,<institution>KEK</institution>, Tsukuba, Ibaraki 305-0801,<country>Japan</country></aff></contrib-group><author-notes><corresp id="cor">Correspondence e-mail: <email>g.george@usask.ca</email>, <email>ingrid.pickering@usask.ca</email>, <email>isabella-ascone@chimie-paristech.fr</email>, <email>hedman@slac.stanford.edu</email>, <email>hodgson@slac.stanford.edu</email>, <email>peter.lay@sydney.edu.au</email></corresp></author-notes><pub-date pub-type="ppub"><day>01</day><month>11</month><year>2012</year></pub-date><pub-date pub-type="epub"><day>18</day><month>10</month><year>2012</year></pub-date><pub-date pub-type="pmc-release"><day>01</day><month>11</month><year>2013</year></pub-date><pmc-comment> PMC Release delay is 12 months and 0 days and was based on the
<volume>19</volume><issue>Pt 6</issue><issue-id pub-id-type="publisher-id">s120600</issue-id><fpage>875</fpage><lpage>886</lpage><history><date date-type="received"><day>04</day><month>3</month><year>2012</year></date><date date-type="accepted"><day>16</day><month>9</month><year>2012</year></date></history><permissions><copyright-statement>© International Union of Crystallography 2012</copyright-statement><copyright-year>2012</copyright-year></permissions><self-uri xlink:type="simple" xlink:href="http://dx.doi.org/10.1107/S090904951203943X">A full version of this article is available from Crystallography Journals Online.</self-uri><abstract abstract-type="toc"><p>X-ray-induced photo-chemistry of metal sites within biological molecules is a concern for X-ray absorption spectroscopy, X-ray crystallography and other techniques in which samples are illuminated with X-rays. The effects of X-ray-induced photo-chemistry are reviewed and the methods used to mitigate these in X-ray absorption spectroscopy are outlined.</p></abstract><abstract><p>As synchrotron light sources and optics deliver greater photon flux on samples, X-ray-induced photo-chemistry is increasingly encountered in X-ray absorption spectroscopy (XAS) experiments. The resulting problems are particularly pronounced for biological XAS experiments. This is because biological samples are very often quite dilute and therefore require signal averaging to achieve adequate signal-to-noise ratios, with correspondingly greater exposures to the X-ray beam. This paper reviews the origins of photo-reduction and photo-oxidation, the impact that they can have on active site structure, and the methods that can be used to provide relief from X-ray-induced photo-chemical artifacts.</p></abstract><kwd-group><kwd>X-ray absorption spectroscopy</kwd><kwd>extended X-ray absorption fine structure</kwd><kwd>X-ray absorption near edge</kwd><kwd>photo-reduction</kwd><kwd>metalloproteins</kwd><kwd>metalloenzymes</kwd></kwd-group><conference><conf-date></conf-date><conf-name>International Workshop on Improving Data Quality and Quantity for XAFS Experiments (Q2XAFS2011)</conf-name><conf-loc></conf-loc></conference></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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