{"refrec":{"BRefID":134614,"RR":"<b>Rijstenbil, J.W.; Sinke, J.J.</b> (1989). The influence of salinity fluctuation on the ammonium metabolism of the marine diatom <i>Skeletonema costatum</i> grown in continuous culture. <i>J. Plankton Res. 11(2)</i>: 297-315. <a href=\"https://dx.doi.org/10.1093/plankt/11.2.297\" target=\"_blank\">https://dx.doi.org/10.1093/plankt/11.2.297</a>","BEntID":128547,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Plankton Res. 11(2)</i>: 297-315. <a href=\"https://dx.doi.org/10.1093/plankt/11.2.297\" target=\"_blank\">https://dx.doi.org/10.1093/plankt/11.2.297</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Rijstenbil, J.W.; Sinke, J.J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Rijstenbil, J.W.; Sinke, J.J.","Englishabstract":"Ammonium-limited cultures of <i>Skeletonema costatum</i> were grown at dilution rates from 0.019 to 0.038 h<sup>-1</sup> at an average salinity of 22.4{per thousand} For a few days cultures were exposed to a freshwater pulse. When salinity was decreased to 8.6{per thousand} (average minimum) photosynthesis and cell division were inhibited. Both <i>in vivo</i> and DCMU-enhanced fluorescence per cell were statistically constant: photosystems I and II were not inhibited by a gradual salinity decrease. Ammonium assimilation was affected via an inhibition of carbon fixation. Ammonium concentrations increased in the continuous cultures, whereas the overcapacity of ammonium uptake declined: the nitrogen limitation was relieved. When salinity was increased again, photosynthesis and cell division were stimulated. Salinity fluctuations were accompanied by a fluctuation in the pools of aspartic acid (0.5-1.0 mM), glutamine acid (0.9-4.1 mM) and glutamine (0.5-2.0 mM). The pool of glutamic acid followed the salinity pattern (r=0.67, P<0.05). The correlation between the amino acid pool and the osmotic value of the medium was significant (r=0.72, P<0.05). Cellular glutamic acid and glutamine levels increased until the nitrogen limitation was restored.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"The influence of salinity fluctuation on the ammonium metabolism of the marine diatom <i>Skeletonema costatum</i> grown in continuous culture","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-22 01:31:39.149553","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1989,"MonPub":null,"DateUpdate":"2009-04-30","DateCreate":"2009-04-30","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:A1989T556700009","VABBcode":null,"OpenAcc":0,"DOI":"10.1093/plankt/11.2.297"},"refs":null,"anarec":{"AnaID":134614,"PubliDate":1989,"Pagination":"297-315","XtraPublOfAnaID":null,"ISBN":null,"Volume":"11","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43255,"SerRR":"Journal of Plankton Research. 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