Christian Tamburini - Water Reasearch abstract> </head> <body bgcolor="#C4C4C4"> <p class="MsoNormal" style="line-height: 100%; mso-list: none; mso-list-ins: Michel Ragot 20020110T1134; word-spacing: 0; text-indent: 0; margin: 0" align="center"><span lang="EN-GB" style="font-size:12.0pt;mso-bidi-font-size:10.0pt;font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-GB;mso-fareast-language: FR;mso-bidi-language:AR-SA"><b>Determination of the bacterial processes which are sources of nitrous oxide production in marine samples. </b> </span></p> <p class="MsoNormal" style="line-height: 100%; mso-list: none; mso-list-ins: Michel Ragot 20020110T1134; word-spacing: 0; text-indent: 0; margin: 0" align="center"> </p> <p class="MsoNormal" style="line-height: 100%; mso-list: none; mso-list-ins: Michel Ragot 20020110T1134; word-spacing: 0; text-indent: 0; margin: 0" align="center"><span style="font-size:12.0pt;mso-bidi-font-size:10.0pt; font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; mso-ansi-language:FR;mso-fareast-language:FR;mso-bidi-language:AR-SA">Bonin P.<sup>1*</sup>, <b style="mso-bidi-font-weight:normal">Tamburini C.</b><sup><span style="mso-bidi-font-weight: normal">2</span></sup>, Michotey V.<sup><span style="mso-bidi-font-weight: normal">1</span></sup></span></p> <p class="MsoNormal" align="center" style="word-spacing: 0; line-height: 100%; text-indent: 0; margin: 0"> </p> <p class="MsoNormal" align="center" style="word-spacing: 0; line-height: 150%; text-indent: 0; margin: 0"><span style="font-family: Times New Roman; mso-ansi-language: FR"><font size="2"><sup>2</sup> Laboratoire d'Océanologie et de Biogéochimie, UMR 6535 CNRS – INSU & Université de la Méditerranée, COM, Campus de Luminy, Case 901, 13288 Marseille, Cedex 9, France<o:p> </font></span><span style="font-family: Times New Roman; mso-ansi-language: FR"><font size="2">*E-mail: <a href="mailto:ctambu@com.univ-mrs.fr">pbonin@com.univ-mrs.fr</a></font></span><span lang="DE" style="font-size:10.0pt;mso-ansi-language: DE"><a href="mailto:ctambu@com.univ-mrs.fr"><o:p> </a></span></p> <p class="MsoNormal" align="center" style="word-spacing: 0; line-height: 150%; text-indent: 0; margin: 0"><span style="font-family: Times New Roman; mso-ansi-language: FR"><font size="2"><sup>2</sup> Laboratoire Microbiologie Marine, UMR 6117 CNRS – INSU & Université de la Méditerranée, COM, Campus de Luminy, Case 907, 13288 Marseille, Cedex 9, France<o:p> </o:p> </font></span></p> <p class="MsoNormal" style="word-spacing: 0; line-height: 100%; text-indent: 0; margin: 0" align="center"></p> <p class="MsoNormal" style="line-height: 100%; mso-list: none; mso-list-ins: Michel Ragot 20020110T1134; word-spacing: 0; text-indent: 0; margin: 0" align="center"><span lang="EN-GB" style="font-size:12.0pt;mso-bidi-font-size:10.0pt;font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-GB;mso-fareast-language: FR;mso-bidi-language:AR-SA"> <i style="mso-bidi-font-style: normal">Water Research</i> 36 (3): 722-732 </span><span style="font-size:12.0pt;mso-bidi-font-size:10.0pt; font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; mso-ansi-language:FR;mso-fareast-language:FR;mso-bidi-language:AR-SA">(2001) </span></p> <p class="MsoNormal" style="line-height: 100%; mso-list: none; mso-list-ins: Michel Ragot 20020110T1134; word-spacing: 0; text-indent: 0; margin: 0" align="justify"> </p> <p class="MsoNormal" style="line-height: 150%; mso-list: none; mso-list-ins: Michel Ragot 20020110T1134; word-spacing: 0; text-indent: 0; margin: 0" align="justify"><font FACE="Times New Roman"><b>Abstract: </b>Partial denitrification and the initial step of nitrification are the main biological processes which produce nitrous oxide. In order to determine the contribution that these processes have in nitrous oxide production, the efficiency of different inhibitors on nitrifying activity has been tested, and the effect on denitrifying activity has been investigated, using culture strains and natural marine samples. A good nitrification inhibitor should not affect denitrification. A low partial pressure of C<sub>2</sub>H<sub>2</sub> provided the best conditions, inhibiting 75%, Nitrosococcus oceanus (culture sample) and 100% (natural sample) of the nitrifying activity and having only a small inhibitory effect (12%) on denitrifying activity. These conditions have been applied on samples from the dilution plume of the Rhjne River, an area characterized as a source of nitrous oxide. Using these inhibitors, it has been shown that in this area, incomplete denitrification is the main process producing nitrous oxide in the surface layers at the mouth of the river and in the bottom nepheloid layer, whereas in the marine surface layer the dominant process is nitrification.</font><span lang="EN-GB" style="mso-ansi-language: EN-GB"></o:p> </span></p> </body> </html>