{"id":{"repo_id":"oldenburg","oai_identifier":"oai:oops.uni-oldenburg.de:197"},"canonical_url":"https://search.dev.ndltd.org/etd/oldenburg/oai:oops.uni-oldenburg.de:197","repository":{"repo_id":"oldenburg","name":"Carl von Ossietzky Universität Oldenburg","base_url":"http://oops.uni-oldenburg.de/cgi/oai2"},"display":{"title":"Environmental organic geochemistry of sediments from Wadi Gaza and investigation of bioremediation of petroleum derivatives and herbicides by cyanobacterial mats under different experimental conditions","abstract":"This thesis presents for the first time results of (i) an organic geochemical analysis of sediments from Wadi Gaza, and (ii) an investigation of the degradation potential of naturally occurring cyanobacterial mats originating from Wadi Gaza. In the Wadi Gaza sediments, the presence of pristane and phytane, an unresolved complex mixture (UCM), the UCM/n-alcane ratio, the low carbon preference index (CPI ca. 1), steranes and hopanes and the presence of the phenanthrene, dibenzothiophene and their alkylated homologues confirms the input of crude oil and petroleum derivatives. Wadi Gaza cyanobacterial mats degraded aromatic compounds (phenantrene and dibenzothiophene) faster than aliphatic ones (pristane and n-octadecane) in both laboratory and mesocosm experiments. An Egyptian crude oil was also degraded. More than 80% of 2,4-dichlorophenoxyacetic acid (2,4-D) and 60% of terbutryn were removed within 30 and 80 days, respectively. We conclude that the Wadi Gaza cyanobacterial mats have grown in a heavily polluted environment, and by that their capacity for bioremediation by degrading petroleum hydrocarbons and herbicides is strong.","abstract_html":"This thesis presents for the first time results of (i) an organic geochemical analysis of sediments from Wadi Gaza, and (ii) an investigation of the degradation potential of naturally occurring cyanobacterial mats originating from Wadi Gaza. In the Wadi Gaza sediments, the presence of pristane and phytane, an unresolved complex mixture (UCM), the UCM/n-alcane ratio, the low carbon preference index (CPI ca. 1), steranes and hopanes and the presence of the phenanthrene, dibenzothiophene and their alkylated homologues confirms the input of crude oil and petroleum derivatives. Wadi Gaza cyanobacterial mats degraded aromatic compounds (phenantrene and dibenzothiophene) faster than aliphatic ones (pristane and n-octadecane) in both laboratory and mesocosm experiments. An Egyptian crude oil was also degraded. More than 80% of 2,4-dichlorophenoxyacetic acid (2,4-D) and 60% of terbutryn were removed within 30 and 80 days, respectively. We conclude that the Wadi Gaza cyanobacterial mats have grown in a heavily polluted environment, and by that their capacity for bioremediation by degrading petroleum hydrocarbons and herbicides is strong.","abstract_has_math":false,"creators":["Safi, Nimer Mohamed Deeb"],"institution":"Universität Oldenburg","degree_name":null,"degree_level":"thesis.doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2004,"date_issued":"2004-03-05","date_published":"2004-03-05","updated_at":"2026-07-27T20:27:18Z","subjects":["[Keine Schlagwörter von Autor/in vergeben.]"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://oops.uni-oldenburg.de/197","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Safi, Nimer Mohamed Deeb"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["BIS der Universität Oldenburg"]},{"key":"dc:type","label":"Dc Type","values":["doctoralThesis"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis.doctoral"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Universität Oldenburg"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["[Keine Schlagwörter von Autor/in vergeben.]"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This thesis presents for the first time results of (i) an organic geochemical analysis of sediments from Wadi Gaza, and (ii) an investigation of the degradation potential of naturally occurring cyanobacterial mats originating from Wadi Gaza. In the Wadi Gaza sediments, the presence of pristane and phytane, an unresolved complex mixture (UCM), the UCM/n-alcane ratio, the low carbon preference index (CPI ca. 1), steranes and hopanes and the presence of the phenanthrene, dibenzothiophene and their alkylated homologues confirms the input of crude oil and petroleum derivatives. Wadi Gaza cyanobacterial mats degraded aromatic compounds (phenantrene and dibenzothiophene) faster than aliphatic ones (pristane and n-octadecane) in both laboratory and mesocosm experiments. An Egyptian crude oil was also degraded. More than 80% of 2,4-dichlorophenoxyacetic acid (2,4-D) and 60% of terbutryn were removed within 30 and 80 days, respectively. We conclude that the Wadi Gaza cyanobacterial mats have grown in a heavily polluted environment, and by that their capacity for bioremediation by degrading petroleum hydrocarbons and herbicides is strong.","Diese Doktorarbeit präsentiert erstmalig Ergebnisse von 1.) organisch-geochemischen Untersuchungen an Sedimenten des Wadi Gaza und 2.) Untersuchungen zum Abbaupotential von Cyanobakterienmatten. Das Vorkommen von Pristan und Phytan, von chromatographisch unaufgelösten, komplexen Kohlenwasserstoffgemischen (UCM), das UCM/n-Alkan-Verhältnis, das Fehlen einer Bevorzugung von n-Alkanen bestimmter Kettenlänge und das Auftreten von Steranen und Hopanen sowie von Phenanthren und Dibenzothiophen und deren alkylierten Homologen zeigen eine starke Verschmutzung mit Rohöl und Erdölderivaten an. Die Cyanobakterienmatten haben in Labor- und Mesokosmos-Experimenten aromatische Verbindungen (Phenanthren, Dibenzothiophen) schneller abgebaut als aliphatische (Pristan und n-Oktadekan). Ein ägyptisches Erdöl wurde ebenfalls abgebaut. Über 80% von 2,4-Dichlorophenoxyessigsäure und 60% von Terbutryn wurden in 30 bzw. 80 Tagen degradiert. Die Cyanobakterienmatten des Wadi Gaza weisen ein hohes Bioremediationspotential auf und können Erdölderivate und Herbizide effektiv abbauen."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Environmental organic geochemistry of sediments from Wadi Gaza and investigation of bioremediation of petroleum derivatives and herbicides by cyanobacterial mats under different experimental conditions"]}]}],"canonical_facts":{"dc:creator":["Safi, Nimer Mohamed Deeb"],"dc:description.abstract":["This thesis presents for the first time results of (i) an organic geochemical analysis of sediments from Wadi Gaza, and (ii) an investigation of the degradation potential of naturally occurring cyanobacterial mats originating from Wadi Gaza. In the Wadi Gaza sediments, the presence of pristane and phytane, an unresolved complex mixture (UCM), the UCM/n-alcane ratio, the low carbon preference index (CPI ca. 1), steranes and hopanes and the presence of the phenanthrene, dibenzothiophene and their alkylated homologues confirms the input of crude oil and petroleum derivatives. Wadi Gaza cyanobacterial mats degraded aromatic compounds (phenantrene and dibenzothiophene) faster than aliphatic ones (pristane and n-octadecane) in both laboratory and mesocosm experiments. An Egyptian crude oil was also degraded. More than 80% of 2,4-dichlorophenoxyacetic acid (2,4-D) and 60% of terbutryn were removed within 30 and 80 days, respectively. We conclude that the Wadi Gaza cyanobacterial mats have grown in a heavily polluted environment, and by that their capacity for bioremediation by degrading petroleum hydrocarbons and herbicides is strong.","Diese Doktorarbeit präsentiert erstmalig Ergebnisse von 1.) organisch-geochemischen Untersuchungen an Sedimenten des Wadi Gaza und 2.) Untersuchungen zum Abbaupotential von Cyanobakterienmatten. Das Vorkommen von Pristan und Phytan, von chromatographisch unaufgelösten, komplexen Kohlenwasserstoffgemischen (UCM), das UCM/n-Alkan-Verhältnis, das Fehlen einer Bevorzugung von n-Alkanen bestimmter Kettenlänge und das Auftreten von Steranen und Hopanen sowie von Phenanthren und Dibenzothiophen und deren alkylierten Homologen zeigen eine starke Verschmutzung mit Rohöl und Erdölderivaten an. Die Cyanobakterienmatten haben in Labor- und Mesokosmos-Experimenten aromatische Verbindungen (Phenanthren, Dibenzothiophen) schneller abgebaut als aliphatische (Pristan und n-Oktadekan). Ein ägyptisches Erdöl wurde ebenfalls abgebaut. Über 80% von 2,4-Dichlorophenoxyessigsäure und 60% von Terbutryn wurden in 30 bzw. 80 Tagen degradiert. Die Cyanobakterienmatten des Wadi Gaza weisen ein hohes Bioremediationspotential auf und können Erdölderivate und Herbizide effektiv abbauen."],"dc:format.medium":["application/pdf"],"dc:publisher":["BIS der Universität Oldenburg"],"dc:subject":["[Keine Schlagwörter von Autor/in vergeben.]"],"dc:title":["Environmental organic geochemistry of sediments from Wadi Gaza and investigation of bioremediation of petroleum derivatives and herbicides by cyanobacterial mats under different experimental conditions"],"dc:type":["doctoralThesis"],"thesis:degree_level":["thesis.doctoral"],"thesis:institution_name":["Universität Oldenburg"]},"updated_at":"2026-07-27T20:27:18Z"}