{"refrec":{"BRefID":61839,"RR":"<b>Packard, T.; Blasco, D.; Estrada, M.</b> (2004). Modeling physiological processes in plankton on enzyme kinetic principles. <i>Sci. Mar. (Barc.) 68(S1)</i>: 49-56. <a href=\"https://dx.doi.org/10.3989/scimar.2004.68s149\" target=\"_blank\">https://dx.doi.org/10.3989/scimar.2004.68s149</a>","BEntID":58471,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Sci. Mar. (Barc.) 68(S1)</i>: 49-56. <a href=\"https://dx.doi.org/10.3989/scimar.2004.68s149\" target=\"_blank\">https://dx.doi.org/10.3989/scimar.2004.68s149</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Packard, T.; Blasco, D.; Estrada, M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Packard, T.; Blasco, D.; Estrada, M.","Englishabstract":"Many ecologically important chemical transformations in the ocean are controlled by biochemical enzyme reactions in plankton. Nitrogenase regulates the transformation of N<sub>2</sub> to ammonium in some cyanobacteria and serves as the entryway for N<sub>2</sub> into the ocean biosphere. Nitrate reductase controls the reduction of NO<sub>3</sub> to NO<sub>2</sub> and hence new production in phytoplankton. The respiratory electron transfer system in all organisms links the carbon oxidation reactions of intermediary metabolism with the reduction of oxygen in respiration. Rubisco controls the fixation of CO<sub>2</sub> into organic matter in phytoplankton and thus is the major entry point of carbon into the oceanic biosphere. In addition to these, there are the enzymes that control CO2 production, NH<sub>4 </sub>excretion and the fluxes of phosphate. Some of these enzymes have been recognized and researched by marine scientists in the last thirty years. However, until recently the kinetic principles of enzyme control have not been exploited to formulate accurate mathematical equations of the controlling physiological expressions. Were such expressions available they would increase our power to predict the rates of chemical transformations in the extracellular environment of microbial populations whether this extracellular environment is culture media or the ocean. Here we formulate from the principles of bisubstrate enzyme kinetics, mathematical expressions for the processes of NO<sub>3 </sub>reduction, O<sub>2</sub> consumption, N<sub>2</sub> fixation, total nitrogen uptake.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Modeling physiological processes in plankton on enzyme kinetic principles","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-14 01:31:09.234397","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"allometry; electron transport; ETS; glutamine synthase; nitrate reductase; nitrogen fixation; nitrogenase","OtherDescriptors":"allometry, electron transport, ETS, glutamine synthase, nitrate reductase, nitrogen fixation, nitrogenase.","Notes":null,"AnaPub":2004,"MonPub":null,"DateUpdate":"2020-10-02","DateCreate":"2004-05-24","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000221126200007","VABBcode":null,"OpenAcc":1,"DOI":"10.3989/scimar.2004.68s149"},"refs":null,"anarec":{"AnaID":61839,"PubliDate":2004,"Pagination":"49-56","XtraPublOfAnaID":null,"ISBN":null,"Volume":"68","Issue":"S1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43791,"SerRR":"Scientia Marina (Barcelona). 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