Duties

Responsibility for the LADIS elemental and isotopic analysis workshop for the determination of total C, total N, 13C and 15N in soil, plant and solution samples, using high-temperature catalytic combustion and mass spectrometry. Maintenance of the analytical tool, planning and execution of analyses for unit projects and external services, data processing (with critical analysis of the quality of results), assistance to those requesting analyses for the exploitation of their results, improvement of the analytical tool and quality procedures and, fine-tuning to meet specific analytical needs.

Participation in UMR FARE scientific projects involving the use of stable isotopes.

Training

DUT MESURES PHYSIQ TECHN INSTRUMENTALES 1985

Main publications

Bertrand I., Delfosse O., Mary, B. (2007) Carbon and nitrogen mineralization in acidic, limed and calcareous agricultural soils: Apparent and actual effects. Soil Biology and Biochemistry 39 276-288. DOI

Coppens F., Alavoine G., Delfosse O., Recous S. (2009) "Evaluation of sample pre-treatment and potential contamination of soluble carbon in soil extracts during lyophilization" Soil Biology & Biochemistry, 41, 6, 1335-1337 DOI

Prache, S., Kondjoyan, N., Delfosse, O., Chauveau-Duriot, B., Andueza, D., Cornu, A. (2009) Discrimination des agneaux nourris au pâturage des agneaux nourris à la luzerne déshydratée à l'intérieur à l'aide de différents composés mesurés dans la graisse, la viande et le plasma. Animal , 3, 598-605

Delfosse, O. ; Froidmont, E. ; Fernandez Pierna, J.A. ; Martin, C. ; Dehareng, F. (2010) Estimation des émissions de méthane par les vaches laitières sur la base de la composition du lait. [Communication orale (résumé)]. Greenhouse Gases and Animal Agriculture Conference (GGAA2010) ; 2010/10/03-08 ; Banff (CAN). McGeough, E.J. (Editeur) ; McGinn, S.M. (Editeur). Compte rendu de la 4e conférence sur les gaz à effet de serre et l'agriculture animale. 2010. 198

Salon, C. ; Voisin, A.S. ; Delfosse, O. ; Mary, B. (2010) Methodologies for measuring symbiotic nitrogen fixation in the field. Munier-Jolain, N. (Coordinateur) ; Biarnès, V. (Coordinateur) ; Chaillet, I. (Coordinateur) ; Lecoeur, J. (Coordinateur) ; Jeuffroy, M.H. (Coordinateur). Physiologie de la culture du pois. Boca Raton (USA) : CRC Press ; 83-87.

 Devincenzi T., Delfosse O., Andueza D., Nabinger C., Prache S. (2013) Dose-dependent response of nitrogen stable isotope ratio to proportion of legumes in diet to authenticate lamb meat produced from legume-rich pastures. Food Chemistry, 152 : 456-461

Devincenzi T., Delfosse O., Andueza D., Nabinger C., Prache S. (2013) Dose-dependent response of nitrogen stable isotope ratio to proportion of legumes in diet to authenticate lamb meat produced from legume-rich pastures. Food Chemistry, 152 : 456-461

Attard E., Le Roux X., Charrier X., Delfosse O., Guillaumaud N., Lemaire G. (2016) Delayed and assymmetric responses of soil C pools and N fluxes to grassland/cropland conversions. Soil Biology & Biochemistry, 97, 31-39.