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[{"key": "dc.contributor.advisor", "value": "Aalto, Sanni", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Juusela, Ville", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Kangasniemi, Niko", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Rintam\u00e4ki, Lauri", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2015-10-29T11:09:51Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2015-10-29T11:09:51Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2015", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/47497", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Vesien rehev\u00f6ityminen on maailmanlaajuinen ongelma. Ihmisen toiminnan takia ravinteita,\r\nkuten typpe\u00e4 ja fosforia, kulkeutuu vesiin paljon aiheuttaen mm. massiivisia lev\u00e4kukintoja\r\nja happikatoa orgaanisen aineen hajotessa. T\u00e4m\u00e4 v\u00e4hent\u00e4\u00e4 mm. vesien virkistysarvoa sek\u00e4\r\nkaupallista arvoa. Meriss\u00e4 typpi on rajoittava ravinne ja suurin osa typest\u00e4 p\u00e4\u00e4tyy meriin\r\njokivesien mukana. J\u00e4rviss\u00e4 tapahtuvassa denitrifikaatiossa typpi muuttuu kaasumaiseen\r\nmuotoon, mik\u00e4 v\u00e4hent\u00e4\u00e4 merien typpikuormaa. Tutkimuksessamme mittasimme\r\ndenitrifikaationopeutta kolmella eri mittauspisteell\u00e4 Keuruunsel\u00e4ll\u00e4 vuosien 2013 ja 2014\r\naikana viiten\u00e4 kertana. Jaoimme aineiston vuodenajan mukaan kes\u00e4\u00e4n, syksyyn ja talveen.\r\nHypoteesin\u00e4 oli, ett\u00e4 denitrifikaationopeus muuttuu vuodenajan mukaan ollen suurempaa\r\nkes\u00e4ll\u00e4 l\u00e4mpim\u00e4n veden aikaan kuin talvella kylm\u00e4n veden aikaan ja ollen syksyll\u00e4\r\npienint\u00e4 hyvin hapettuneen veden aikaan. Arvelimme my\u00f6s, ett\u00e4 denitrifikaationopeus on\r\nsuurinta j\u00e4tevedenpuhdistamon purkuputken kohdalla, sill\u00e4 siell\u00e4 bakteereille on tarjolla\r\neniten ravinteita ja l\u00e4mp\u00f6\u00e4. K\u00e4ytimme mittauksessa isotope pairing technique-menetelm\u00e4\u00e4\r\n(IPT), jossa 15N-leimattua typpe\u00e4 k\u00e4ytet\u00e4\u00e4n luonnollisen denitrifikaationopeuden\r\nm\u00e4\u00e4ritykseen. Kentt\u00e4tutkimuksessa vuodenajan vaikutus oli hypoteesimme mukaisesti\r\ntilastollisesti merkitsev\u00e4: denitrifikaatio oli nopeinta kes\u00e4ll\u00e4 ja hitainta syksyll\u00e4. Talvella\r\ndenitrifikaationopeus oli hitaampi kuin kes\u00e4ll\u00e4, mutta nopeampi kuin syksyll\u00e4.\r\nDenitrifikaationopeudessa oli tilastollisesti merkitsev\u00e4 ero my\u00f6s mittauspisteiden v\u00e4lill\u00e4:\r\ndenitrifikaatio oli nopeinta j\u00e4tevedenpuhdistamon purkuputken p\u00e4\u00e4n l\u00e4heisyydess\u00e4 ja\r\nhitainta purkuputkelta yl\u00e4virtaan p\u00e4in. Kehitimme my\u00f6s uuden menetelm\u00e4n heliump\u00e4\u00e4ti\u00f6n\r\n(helium headspace) tekoon. Kehitt\u00e4m\u00e4mme menetelm\u00e4 on nopeampi ja tarkempi kuin\r\nvanha tapa tehd\u00e4 p\u00e4\u00e4ti\u00f6.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Eutrophication of water systems is a global problem. Due to anthropogenic activities,\r\nnutrients such as nitrogen and phosphorous are accumulated in water systems, causing\r\nmassive algal blooms, deoxygenation and decrease of recreational and commercial values\r\nof water systems. In the oceans nitrogen is usually a limiting nutrient, and it is mostly\r\ntransported there via inland streams and rivers. In microbial-driven denitrification process\r\nnitrogen is transformed into gaseous form and removed from the water system. This makes\r\ndenitrification an ideal method of decreasing the marine nitrogen load. In our study we\r\nmeasured the denitrification rate in 3 sampling spots at the lake Keurusselk\u00e4. Samples were\r\ntaken at five different times, of which one was in the winter, when the lake was covered\r\nwith ice. We divided the data into three seasons: summer, autumn and winter. The\r\nhypothesis was that the denitrification activity was to be highest in the summer due to\r\nwarmest water temperature and low oxygenation, lower at winter, when the water is cold\r\nand lowest at autumn, when the lake waters are most oxygenated. We used the isotope\r\npairing technique (IPT) with 15N-labeled nitrogen to measure the denitrification rate at\r\ngiven season and sampling point. We found out that denitrification rate was highest in\r\nsummer, second highest in winter and lowest in autumn. In addition, denitrification rate\r\nwas highest at the sampling point nearest to the wastewater treatment plant\u2019s outlet tube.\r\nWe also developed a new method for making helium headspaces. The new method is faster\r\nand more accurate than the old method.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Niko Kangasniemi (ninekang) on 2015-10-29 11:09:51.030056. Form: Kandidaatintutkielma -lomake (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/kandin-tutkielma-lomake). JyX data: [jyx_publishing-allowed (fi) =True]", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija.group@korppi.jyu.fi) on 2015-10-29T11:09:51Z\r\nNo. of bitstreams: 2\r\nURN:NBN:fi:jyu-201510293533.pdf: 908104 bytes, checksum: 18ca444f6dc5f8f98bf6f1c9e345d03d (MD5)\r\nlicense.html: 5154 bytes, checksum: a07e32df1ab1aa32e224b0f7eb210dcd (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2015-10-29T11:09:51Z (GMT). No. of bitstreams: 2\r\nURN:NBN:fi:jyu-201510293533.pdf: 908104 bytes, checksum: 18ca444f6dc5f8f98bf6f1c9e345d03d (MD5)\r\nlicense.html: 5154 bytes, checksum: a07e32df1ab1aa32e224b0f7eb210dcd (MD5)\r\n Previous issue date: 2015", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "22", "language": null, "element": "format", "qualifier": "extent", "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": "denitrifikaatio", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "denitrifikaationopeus", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "isotope pairing technique", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "It\u00e4meri", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Keurussel\u00e4n denitrifikaatioaktiivisuuden ajallinen ja paikallinen vaihtelu", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "bachelor thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201510293533", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.dcmitype", "value": "Text", "language": "en", "element": "type", "qualifier": "dcmitype", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Kandidaatintutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Bachelor's 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 Mathematics and Science", "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.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Akvaattiset tieteet", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.date.updated", "value": "2015-10-29T11:09:52Z", "language": null, "element": "date", "qualifier": "updated", "schema": "dc"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_7a1f", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "restrictedAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "bachelorThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.rights.accessrights", "value": "This material has a restricted access due to copyright reasons. It can be read at the workstation at Jyv\u00e4skyl\u00e4 University Library reserved for the use of archival materials: https://kirjasto.jyu.fi/en/workspaces/facilities.", "language": "en", "element": "rights", "qualifier": "accessrights", "schema": "dc"}, {"key": "dc.rights.accessrights", "value": "Aineistoon p\u00e4\u00e4sy\u00e4 on rajoitettu tekij\u00e4noikeussyist\u00e4. Aineisto on luettavissa Jyv\u00e4skyl\u00e4n yliopiston kirjaston arkistoty\u00f6asemalta. Ks. https://kirjasto.jyu.fi/fi/tyoskentelytilat/laitteet-ja-tilat.", "language": "fi", "element": "rights", "qualifier": "accessrights", "schema": "dc"}]
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