{"refrec":{"BRefID":231348,"RR":"<b>Rush, D.; Jaeschke, A.; Hopmans, E.C.; Geenevasen, J.A.J.; Schouten, S.; Sinninghe Damsté, J.S.</b> (2011). Short chain ladderanes: Oxic biodegradation products of anammox lipids. <i>Geochim. Cosmochim. Acta 75(6)</i>: 1662-1671. <a href=\"http://dx.doi.org/10.1016/j.gca.2011.01.013\" target=\"_blank\">dx.doi.org/10.1016/j.gca.2011.01.013</a>","BEntID":223060,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Geochim. Cosmochim. Acta 75(6)</i>: 1662-1671. <a href=\"https://dx.doi.org/10.1016/j.gca.2011.01.013\" target=\"_blank\">https://dx.doi.org/10.1016/j.gca.2011.01.013</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Rush, D.; Jaeschke, A.; Hopmans, E.C.; Geenevasen, J.A.J.; Schouten, S.; Sinninghe Damsté, J.S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Rush, D. <i>et al.</i>","Englishabstract":"Anammox, the microbial anaerobic oxidation of ammonium by nitrite to produce dinitrogen gas, has been recognized as a key process in both the marine and freshwater nitrogen cycles, and found to be a major sink for fixed inorganic nitrogen in the oceans. Ladderane lipids are unique anammox bacterial membrane lipids that have been used as biomarkers for anammox bacteria in recent and past environmental settings. However, the fate of ladderane lipids during diagenesis is as of yet unknown. In this study, we performed oxic degradation experiments (at 20-100 degrees C) with anammox bacterial biomass to simulate early diagenetic processes occurring in the water column and at the sediment water interface. Abundances of C(18) and C(20) ladderane lipids decreased with increasing temperatures, testifying to their labile nature. The most abundant products formed were ladderane lipids with a shorter alkyl side chain (C(14) and C(16) ladderane fatty acids), which was unambiguously established using two-dimensional NMR techniques on an isolated C(14)-[3]-ladderane fatty acid. The most pronounced production of these short-chain lipids was at 40 degrees C, suggesting that degradation of ladderane lipids was microbially mediated, likely through a beta-oxidation pathway. An HPLC-MS/MS method was developed for the detection of these ladderane alteration products in environmental samples and positively tested on various sediments. This showed that the ladderanes formed during degradation experiments also naturally occur in the marine environment. Thus, short-chain ladderane lipids may complement the original longer-chain ladderane lipids as suitable biomarkers for the detection of anammox processes in past depositional environments.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Short chain ladderanes: Oxic biodegradation products of anammox lipids","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2011,"MonPub":null,"DateUpdate":"2014-05-27","DateCreate":"2013-12-01","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000287682500015","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.gca.2011.01.013"},"refs":null,"anarec":{"AnaID":231348,"PubliDate":2011,"Pagination":"1662-1671","XtraPublOfAnaID":null,"ISBN":null,"Volume":"75","Issue":"6","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42901,"SerRR":"Geochimica et Cosmochimica Acta. Elsevier: Oxford,New York etc..  ISSN 0016-7037; e-ISSN 1872-9533","StandardTitleSer":"Geochimica et Cosmochimica Acta","ISSN":"0016-7037","AbbrevSer":"Geochim. Cosmochim. 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