{"refrec":{"BRefID":76405,"RR":"<b>Kristiansen, S.</b> (1983). Urea as a nitrogen source for the phytoplankton in the Oslofjord. <i>Mar. Biol. (Berl.) 74(1)</i>: 17-24","BEntID":72008,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Mar. Biol. (Berl.) 74(1)</i>: 17-24","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Kristiansen, S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Kristiansen, S.","Englishabstract":"Ambient concentrations of urea in the inner Oslofjord, Norway, showed a pronounced yearly cycle in 1980, with values in the range 0.1 to 10.0 mu g-at N l<sup>-1</sup>: this cycle resembled that of ammonia although urea concentrations were usually lower. The uptake of urea by phytoplankton was investigated using <sup>15</sup>N. Urea was usually a less important N source than NH<sup>+</sup>4, and accounted for 0 to 53% (mean 19%) of summed NH<sup>+</sup>4 + NO<sub>3</sub><sup>-</sup> urea uptake reates from April to October. Absolute as well as relative (specific) uptake rates of urea were higher in the summer (June-August) than at other times. Uptake of urea was inhibited by NH<sup>+</sup>4 concentrations higher than 1 to 2 mu g- at N l<sup>-1</sup>. The summed NH<sup>+</sup>4 + NO<sub>3</sub><sup>-</sup> urea uptake rate was exponentially related to temperature.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Urea as a nitrogen source for the phytoplankton in the Oslofjord","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-05-17 01:32:10.271489","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1983,"MonPub":null,"DateUpdate":"2005-09-13","DateCreate":"2005-09-13","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:A1983QV85600003","VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":76405,"PubliDate":1983,"Pagination":"17-24","XtraPublOfAnaID":null,"ISBN":null,"Volume":"74","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43352,"SerRR":"Marine Biology: International Journal on Life in Oceans and Coastal Waters. 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