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[{"key": "dc.contributor.advisor", "value": "V\u00e4h\u00e4talo, Anssi", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Kotiranta, Titta", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2021-10-06T04:55:56Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2021-10-06T04:55:56Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2021", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/78030", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "T\u00e4ss\u00e4 Pro gradu -tutkielmassa etsit\u00e4\u00e4n kokeellisesti vastausta siihen, osallistuvatko makean veden heterotrofiset bakteerit vesiymp\u00e4rist\u00f6ss\u00e4 tapahtuvaan, voimakkaasti hapettavia hydroksyyliradikaaleja (\u2022OH) muodostavaan, Fentonin reaktioon. Tarkastellun mekanismin oletettiin aktivoituvan bakteerien oksidoreduktaasientsyymien v\u00e4lityksell\u00e4, jotka katalysoivat v\u00e4lillisesti vetyperoksidin (H2O2) muodostumista. Ferrorauta (Fe2+) toimi vedess\u00e4 reaktion katalyyttina, mink\u00e4 vuoksi rautapitoisissa humusvesiss\u00e4 reaktion odotettiin tapahtuvan nopeammin. Mekanismia testattiin kahdessa erilaisessa j\u00e4rvivedess\u00e4, joista toinen oli humuksinen (korkea DOC) ja rautapitoinen Nimet\u00f6n ja toinen kirkasvetisempi (matala DOC) ja v\u00e4h\u00e4rautainen Vesij\u00e4rvi. Tutkimuksen p\u00e4\u00e4painona oli mitata korkean erotuskyvyn nestekromatografialla (HPLC) j\u00e4rvivesin\u00e4ytteiss\u00e4 syntyvi\u00e4 hydroksyyliradikaaleja k\u00e4ytt\u00e4m\u00e4ll\u00e4 kumariinia (2H 1 bentsopyran-2-oni) koetinmolekyylin\u00e4. Hydroksyyliradikaaleja muodostui molemmissa j\u00e4rvivesiss\u00e4, mutta tulokset viittasivat abioottiseen muodostumisprosessiin biogeenisen Fentonin reaktion sijaan. \u2022OH:n mitatuissa konsentraatioissa oli kuitenkin merkitt\u00e4vi\u00e4 eroja j\u00e4rvien v\u00e4lill\u00e4, joiden p\u00e4\u00e4teltiin johtuvan (1) j\u00e4rvien erilaisista DOC-pitoisuuksista (2) rautapitoisuudesta, (3) raudan kyvyst\u00e4 kompleksoitua humusmolekyyleihin ja mahdollisesti (4) j\u00e4rvien erilaisista mikrobiyhteis\u00f6ist\u00e4, jotka reagoivat hydroksyyliradikaaleihin eri tavoin.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "This study examines the possible involvement of fresh water heterotrophic bacteria in a series of chemical reactions that produce highly reactive and strongly oxidizing hydroxyl radicals (\u2022OH) in aquatic environment. This mechanism leading to \u2022OH producing reaction (Fenton reaction) was suggested to be triggered by bacterial oxidoreductase enzymes, through which bacteria indirectly catalyze the formation of hydrogen peroxide (H2O2) in water column. Since ferrous iron (Fe2+) catalyzes Fenton reaction, iron content in water column creates favourable conditions for the reaction to proceed. The mechanism was monitored in humic lake water (Nimet\u00f6n), rich in dissolved organic carbon (DOC) and iron, along with non humic lake water (Vesij\u00e4rvi) with poor iron content and low amount of DOC. The focus of the study was to measure hydroxyl radicals generated in the lake water samples by high performance liquid chromatography (HPLC) using coumarin (2H 1 Benzopyran-2-one) as a probe molecule. Hydroxyl radicals were present in both lake waters though instead of the biogenic Fenton reaction the results strongly suggested that an abiotic process was responsible for the \u2022OH-formation in the water samples. Cumulative concentrations of \u2022OH between the two lakes were observed to be significantly different, which were concluded to be due to (1) differences in the DOC concentrations, (2) the iron contents of the lake waters, (3) the tendency of humic substances to chelate iron in water column, leading to the formation of complexes, and finally (4) the differences between microbial communities and microbial responses against aquatic ROS-formation.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2021-10-06T04:55:56Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2021-10-06T04:55:56Z (GMT). No. of bitstreams: 0\n Previous issue date: 2021", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "61", "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": "7-hydroksikumariini", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "DOC", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "DOM", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "heterotrofinen bakteeri", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "HPLC", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "korkean erotuskyvyn nestekromatografia", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "ROS", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "umbelliferoni", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Hydroksyyliradikaalien muodostuminen j\u00e4rviveteen biogeenisess\u00e4 Fentonin reaktiossa", "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-202110065081", "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", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Environmental science", "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": "40151", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kumariinit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "makea vesi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "rauta", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "j\u00e4rvet", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "vesi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "liuennut orgaaninen hiili", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "humus", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "vesist\u00f6t", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "oksidoreduktaasit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "nestekromatografia", "language": null, "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": 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