{"refrec":{"BRefID":30196,"RR":"<b>Thinessempoux, D.; Baguet, F.; Frankart, C.</b> (1987). Evidence for the presence of ion pumps in the photophores of 2 mesopelagic fishes <i>Argyropelecus</i> and <i>Maurolicus</i>. <i>Comp. Biochem. Physiol., Part A Physiol. 88(1)</i>: 75-81. <a href=\"https://dx.doi.org/10.1016/0300-9629(87)90102-2\" target=\"_blank\">https://dx.doi.org/10.1016/0300-9629(87)90102-2</a>","BEntID":30196,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Comp. Biochem. Physiol., Part A Physiol. 88(1)</i>: 75-81. <a href=\"https://dx.doi.org/10.1016/0300-9629(87)90102-2\" target=\"_blank\">https://dx.doi.org/10.1016/0300-9629(87)90102-2</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Thinessempoux, D.; Baguet, F.; Frankart, C.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Thinessempoux, D.; Baguet, F.; Frankart, C.","Englishabstract":"1.\tAdenosine triphosphatase (ATPase) activity has been measured on homogenates of photophores from two mesopelagic fishes <i>Argyropelecus</i> and <i>Maurolicus</i>. This activity is equivalent for both fishes when reported to the protein content as is their O<sub>2</sub> consumption.2.\tThe activity is optimal at pH 6.8-7.5. It is not specific for ATP since GTP, ITP, UTP and CTP are also hydrolyzed to a significant extent. It is also not specific for Mg<sup>2+</sup>, the activity being equivalent (<i>Argyropelecus</i>) or higher (<i>Maurolicus</i>) with Ca<sup>2+</sup> and high also with Co<sup>2+</sup> and Mn<sup>2+</sup>.3.\tTwenty to 30 per cent of the activity measured at pH 7.4 is probably due to the mitochondrial ATPase as it is shown by oligomycin and venturicidin inhibition.4.\tActivities of both fishes photophores are partly inhibited by <i>N-N’</i>-dicyclohexylcarbodiimide (DCCD), azide, LaCl<sub>3</sub>, vanadate, diethylstilbestrol (DES) and <i>N</i>-ethylmaleimide (NEM) which are all inhibitors of ionic pumps.5.\t<i>Argyropelecus</i> activity is sensitive to ouabaïn.6.\tOur results show the presence of ionic pumps in <i>Argyropelecus</i> and <i>Maurolicus</i> photophores. If there is evidence for the absence or very low activity of a H<sup>+</sup> pump, it is sure that <i>Argyropelecus</i> at least possess a Na<sup>+</sup>K<sup>+</sup>-ATPase.7.\tThe significance of a high protein content in <i>Maurolicus</i> photophores and of a large inorganic phosphate concentration in <i>Argyropelecus</i> is discussed.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Evidence for the presence of ion pumps in the photophores of 2 mesopelagic fishes <i>Argyropelecus</i> and <i>Maurolicus</i>","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-18 01:31:14.156259","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1987,"MonPub":null,"DateUpdate":"2015-10-27","DateCreate":"2002-12-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:A1987K283200013","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/0300-9629(87)90102-2"},"refs":null,"anarec":{"AnaID":30196,"PubliDate":1987,"Pagination":"75-81","XtraPublOfAnaID":null,"ISBN":null,"Volume":"88","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42580,"SerRR":"Comparative Biochemistry and Physiology. 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