Spatio-temporal distribution and characterisation of phytoplankton populations coupled with abiotic and biotic changes in landfill leachate treatment basins (Etuffont, Belfort, France)     

Hicham Khattabi  Lotfi Aleya  Jacky Mania 《Water, air, and soil pollution》2006,174(1-4):107-125

The quantitative distribution of dominant phytoplankton species was carried out in the stabilisation ponds of Etueffont landfill leachate (Belfort, France) from May 1998 to May 1999. The results showed maximum phytoplankton abundance in the last lagooning basin during summer 1998, that coincided with an increase in temperature and better leachate quality. In addition, the phytoplankton was dominated by Euglenophytes species Phacus sp. and Euglena sp. known to resist constraints induced by the highly polluted aquatic environments. An improve in water quality of the last basins translated into a shift in species composition with the substitution of the Bacillariophyceae (Stephanodiscus dubius) by the Chlorophyceae (Coelastrum sp.).  相似文献   

Influence of Argan Kernel Roasting-time on Virgin Argan Oil Composition and Oxidative Stability     

Harhar H  Gharby S  Kartah B  El Monfalouti H  Guillaume D  Charrouf Z 《Plant foods for human nutrition (Dordrecht, Netherlands)》2011,66(2):163-168

Virgin argan oil, which is harvested from argan fruit kernels, constitutes an alimentary source of substances of nutraceutical value. Chemical composition and oxidative stability of argan oil prepared from argan kernels roasted for different times were evaluated and compared with those of beauty argan oil that is prepared from unroasted kernels. Prolonged roasting time induced colour development and increased phosphorous content whereas fatty acid composition and tocopherol levels did not change. Oxidative stability data indicate that kernel roasting for 15 to 30 min at 110 °C is optimum to preserve virgin argan oil nutritive properties.  相似文献   

Elemental compositions of comet 81P/Wild 2 samples collected by Stardust     

Flynn GJ  Bleuet P  Borg J  Bradley JP  Brenker FE  Brennan S  Bridges J  Brownlee DE  Bullock ES  Burghammer M  Clark BC  Dai ZR  Daghlian CP  Djouadi Z  Fakra S  Ferroir T  Floss C  Franchi IA  Gainsforth Z  Gallien JP  Gillet P  Grant PG  Graham GA  Green SF  Grossemy F  Heck PR  Herzog GF  Hoppe P  Hörz F  Huth J  Ignatyev K  Ishii HA  Janssens K  Joswiak D  Kearsley AT  Khodja H  Lanzirotti A  Leitner J  Lemelle L  Leroux H  Luening K  Macpherson GJ  Marhas KK  Marcus MA  Matrajt G  Nakamura T  Nakamura-Messenger K  Nakano T  Newville M 《Science (New York, N.Y.)》2006,314(5806):1731-1735

We measured the elemental compositions of material from 23 particles in aerogel and from residue in seven craters in aluminum foil that was collected during passage of the Stardust spacecraft through the coma of comet 81P/Wild 2. These particles are chemically heterogeneous at the largest size scale analyzed ( approximately 180 ng). The mean elemental composition of this Wild 2 material is consistent with the CI meteorite composition, which is thought to represent the bulk composition of the solar system, for the elements Mg, Si, Mn, Fe, and Ni to 35%, and for Ca and Ti to 60%. The elements Cu, Zn, and Ga appear enriched in this Wild 2 material, which suggests that the CI meteorites may not represent the solar system composition for these moderately volatile minor elements.  相似文献