Wandan E.N.,Institute National Polytechnique |
Zabik M.J.,Michigan State University |
Elleingand E.F.,Institute National Polytechnique
Scientific Research and Essays | Year: 2011
We evaluated two commercially available immunoassay kits for the detection of carbofuran in fish and corn leaves. We observed strong matrix interference or inhibition due to the extraction solvent. This interference was corrected by either diluting or decolorizing and diluting the extract. The coefficient of variation of the recovery ranged from 3.9 - 11.0% for the coated tubes compared to 1.3 - 3.9% for magnetic particles bases kits. We detected carbofuran in the range of 0.33 - 0.51 ng/g in fish and 0.75 -2.20 ng/g in corn leaf. The ELISA detection limits were 0.5 ng/g in corn leaf and 0.3 ng/g in fish fillet. The samples, which were positive for carbofuran (by kits) were found to contain carbofuran (by GLC) with a good coefficient of correlation (r 2 = 0.997). These results showed that ELISA can be used for the determination of pesticides in the environment, but observed cross reactivity with the metabolites may interfere with the detection of the parent compound and hinder the detection. The possibility of false positive or false negative detection may require the use of chromatography as confirmation technique. In any case, ELISA is advantageous to developing countries because of the low cost of material acquisition.
Safran, French National Center for Scientific Research, Institute National Polytechnique and University Paul Sabatier | Date: 2014-12-11
A method of localized repair to a damaged thermal barrier, the method including subjecting a part coated in a damaged thermal barrier to electrophoresis treatment, the part being made of an electrically conductive material, the damaged thermal barrier including a ceramic material and presenting at least one damaged zone that is to be repaired, the part being present in an electrolyte including a suspension of particles in a liquid medium, the ceramic coating being deposited by electrophoresis in the damaged zone in order to obtain a repaired thermal barrier for use at temperatures higher than or equal to 1000 C., the particles being made of a material different from the ceramic material present in the damaged thermal barrier.
Snecma, University Paul Sabatier, Institute National Polytechnique and French National Center for Scientific Research | Date: 2012-04-24
The invention relates to a part comprising a coating on a superalloy metal substrate, the coating comprising a metal underlayer covering said substrate, the part being characterized in that said metal underlayer contains a base of nickel aluminide and also contains 0.5 at % to 0.95 at % of one or more stabilizer elements M from the group formed by Cu and Ag for stabilizing the gamma and gamma prime phases.