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[{"key": "dc.contributor.advisor", "value": "V\u00e4h\u00e4talo, Anssi", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Xiao, Yihua", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "N\u00e4si, Marja-Terttu", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2019-02-25T10:34:59Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2019-02-25T10:34:59Z", "language": "", "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2018", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/62946", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Viime aikoina kiinnostus liuenneen orgaanisen aineen (DOM) ja raudan v\u00e4lisen vuorovaikutuksen ymm\u00e4rt\u00e4miseen on lis\u00e4\u00e4ntynyt. Erityisesti raudan vaikutusta DOM:n hajoamiseen ei tunneta tarkasti. Monien bakteerien tiedet\u00e4\u00e4n tuottavan solun ulkopuolelle superoksidia, joka voi muodostaa vetyperoksidia.\r\nVetyperoksidi reagoi raudan kanssa muodostaen hydroksyyliradikaaleja, jotka voivat hajottaa DOM:a bakteereille sopiviksi substraateiksi. T\u00e4ss\u00e4 pro gradu -\r\ntutkielmassa selvitettiin raudan vaikutusta DOM:n hajoamisessa hy\u00f6dynt\u00e4en superoksidin l\u00e4hteen\u00e4 KO2-liuosta bakteerien sijasta. Reaktiomekanismia tutkittiin\r\nseuraamalla hydroksyyliradikaalien muodostumista k\u00e4ytt\u00e4m\u00e4ll\u00e4 kumariinia koettimena. DOM:n hajoamista tarkasteltiin fluoresenssi- ja absorbanssimittauksilla. Hydroksyyliradikaalien muodostuminen oli v\u00e4h\u00e4ist\u00e4\r\nliuoksissa, jotka sis\u00e4lsiv\u00e4t vain DOM:a tai joihin lis\u00e4ttiin vain rautaa tai superoksidia. Hydroksyyliradikaaleja muodostui sek\u00e4 rautaa ett\u00e4 superoksidia sis\u00e4lt\u00e4viss\u00e4 liuoksissa. Liuenneesta orgaanisesta aineesta l\u00f6ydettiin nelj\u00e4 fluoresoivaa komponenttia: kaksi humus- ja yksi proteiinialueen komponentti sek\u00e4 7-hydroksikumariini, joka on kumariinin ja hydroksyyliradikaalin v\u00e4lisen reaktion reaktiotuote. Ilman superoksidia DOM:n hajoamista ei tapahtunut lainkaan, mutta superoksidin ja varsinkin viel\u00e4 raudan l\u00e4sn\u00e4 ollessa hajoaminen oli huomattavaa. T\u00e4m\u00e4n perusteella tutkitulla reaktioreitill\u00e4 voi olla DOM:n hajoamista edist\u00e4v\u00e4 vaikutus.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Recently interactions between the dissolved organic matter (DOM) and iron have attracted increased attention. Especially the effect of iron on the degradation of DOM is not well-known. It has been shown that some bacteria can produce extracellular superoxide, which forms hydrogen peroxide. Hydrogen peroxide can\r\nreact with iron and produce hydroxyl radicals that degrade humic-like DOM into suitable substrates for bacteria. In this master thesis the degradation of DOM-iron associations were assessed by using KO2-solution as the source of superoxide instead of bacteria. The reaction mechanism was examined by following the formation of hydroxyl radicals using coumarin as a probe. The degradation of DOM was studied by fluorescence and absorbance measurements. Yields of hydroxyl radical reactions were low in the experimental treatments that contained DOM alone or with the introductions of iron or KO2 separately. Hydroxyl radicals were produced in the solutions including both iron and superoxide. DOM\r\nincluded four fluorescent components: two humic-like and one protein-like component and 7-hydroxycoumarin, the product of the reaction between coumarin and hydroxyl radical. Significant degradations of DOM occurred only in solutions containing superoxide, especially combined with iron. Based on these\r\nresults these reaction routes can enhance the degradation of DOM.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2019-02-25T10:34:59Z\r\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2019-02-25T10:34:59Z (GMT). No. of bitstreams: 0\r\n Previous issue date: 2018", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "70", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "liuennut orgaaninen aine", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "superoksidi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Haber-Weiss-reaktio", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Fenton-reaktio", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Raudan ja superoksidin vaikutus liuenneen orgaanisen aineen hajoamiseen", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201902251631", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Bio- ja ymp\u00e4rist\u00f6tieteiden laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Biological and Environmental Science", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Ymp\u00e4rist\u00f6tiede ja -teknologia", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Environmental science and technology", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4015", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kumariinit", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "orgaaniset aineet", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "rauta", "language": "", "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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