Physicochemical and microbiological characteristics of kitoza, a traditional salted/dried/smoked meat product of Madagascar

Kitoza samples collected from producers in Madagascar were analyzed for their physicochemical and microbial properties. Lactic acid bacteria and coagulase‐negative staphylococci were the two codominant populations with average counts of 6–7 log cfu/g. Good hygienic practices were sometimes lacking but samples were not contaminated with Salmonella, Clostridium perfringens, and Bacillus cereus and only once with Listeria monocytogenes. Staphylococcus aureus was found occasionally with higher counts in salted/dried products than in salted/smoked products. Moisture, protein, fat, and salt contents varied considerably and were on average 41.5, 43.5, 14.3, and 3.3 g/100 g, respectively, and water activity was 0.893 on average. Smoked kitoza showed higher moisture content compared to dried kitoza. Most of the smoked kitoza had a water activity higher than 0.9 which is not in accordance with their storage at ambient temperatures. Benzo(a)pyrene content was above 2 µg/kg in 11 out of 30 smoked samples (17 ± 16.5 µg/kg on average)

Comportement vibratoire des pièces tournantes à l'aide de données sous-échantillonnées

Dans le cadre de la surveillance vibratoire des roues aubagées de turbines, l'analyse par mesure optique des temps de passage des aubes permet d'étudier les modes vibratoires d'une roue aubagée en fonctionnement. A partir d'un jeu de capteurs disposés sur le carter en regard de l'aubage, on peut en déduire l'amplitude vibratoire de chaque pale au passage devant le capteur. La principale difficulté d'un tel signal est qu'il est fortement sous-échantillonné et replié. On se propose dans cette étude d'appliquer des méthodes de la théorie de l'échantillonnage non-uniforme pour des structures à support fréquentiel multi-bande afin de diminuer les effets du repliement

Sequencing of diverse mandarin, pummelo and orange genomes reveals complex history of admixture during citrus domestication

Cultivated citrus are selections from, or hybrids of, wild progenitor species whose identities and contributions to citrus domestication remain controversial. Here we sequence and compare citrus genomes-a high-quality reference haploid clementine genome and mandarin, pummelo, sweet-orange and sour-orange genomes-and show that cultivated types derive from two progenitor species. Although cultivated pummelos represent selections from one progenitor species, Citrus maxima, cultivated mandarins are introgressions of C. maxima into the ancestral mandarin species Citrus reticulata. The most widely cultivated citrus, sweet orange, is the offspring of previously admixed individuals, but sour orange is an F1 hybrid of pure C. maxima and C. reticulata parents, thus implying that wild mandarins were part of the early breeding germplasm. A Chinese wild 'mandarin' diverges substantially from C. reticulata, thus suggesting the possibility of other unrecognized wild citrus species. Understanding citrus phylogeny through genome analysis clarifies taxonomic relationships and facilitates sequence-directed genetic improvement. (Résumé d'auteur

Sequencing of diverse mandarin, pummelo and orange genomes reveals complex history of admixture during citrus domestication

Cultivated citrus are selections from, or hybrids of, wild progenitor species whose identities and contributions to citrus domestication remain controversial. Here we sequence and compare citrus genomes-a high-quality reference haploid clementine genome and mandarin, pummelo, sweet-orange and sour-orange genomes-and show that cultivated types derive from two progenitor species. Although cultivated pummelos represent selections from one progenitor species, Citrus maxima, cultivated mandarins are introgressions of C. maxima into the ancestral mandarin species Citrus reticulata. The most widely cultivated citrus, sweet orange, is the offspring of previously admixed individuals, but sour orange is an F1 hybrid of pure C. maxima and C. reticulata parents, thus implying that wild mandarins were part of the early breeding germplasm. A Chinese wild 'mandarin' diverges substantially from C. reticulata, thus suggesting the possibility of other unrecognized wild citrus species. Understanding citrus phylogeny through genome analysis clarifies taxonomic relationships and facilitates sequence-directed genetic improvement

La cargaison du Cirebon : un outil essentiel sur Internet

Talon-Noppe Catherine, Quertinmont Arnaud. La cargaison du Cirebon : un outil essentiel sur Internet. In: Les cahiers de Mariemont, volume 39, 2010. Extrême-Orient. pp. 56-60

Comportement vibratoire des pièces tournantes à l'aide de données sous-échantillonnées

Colloque avec actes et comité de lecture. Internationale.International audienceDans le cadre de la surveillance vibratoire des roues aubagées de turbines, l'analyse par mesure optique des temps de passage des aubes permet d'étudier les modes vibratoires d'une roue aubagée en fonctionnement. A partir d'un jeu de capteurs disposés sur le carter en regard de l'aubage, on peut en déduire l'amplitude vibratoire de chaque pale au passage devant le capteur. La principale difficulté d'un tel signal est qu'il est fortement sous-échantillonné et replié. On se propose dans cette étude d'appliquer des méthodes de la théorie de l'échantillonnage non-uniforme pour des structures à support fréquentiel multi-bande afin de diminuer les effets du repliement

Tip-timing data analysis for mistuned bladed discs assemblies

International audienc

Spectral estimation of bladed tip-timing data

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Feasibility of coupling dehydration-impregnation by soaking treatment of meat with fermentation by #Lactobacillus sakei#

International audienceThis study examined the feasibility of coupling dehydration-impregnation by soaking (DIS) with a subsequent lactic fermentation in the treatment of meat. A series of beef fillets were subjected to 3 different DIS treatments. The resulting DIS-treated fillets had 3 different characteristics in terms of water activity, salt, and fermentable sugars contents. Fillets treated with the DIS with the shortest immersion time (5 h) and the highest salt concentration in the DIS bath (100 g/L) were inoculated with Lactobacillus sakei. A control group was left without inoculation. After 24 h incubation at 25 ?C, only inoculated fillets showed signs of lactic fermentation. At 24 h, these fillets had a d-lactic acid content of 68 ?mol/g dry basis and a high population of L. sakei revealed by methods of plate count and quantitative PCR. DIS could therefore be compatible with a subsequent fermentation step by L. sakei. (Résumé d'auteur

Sparse Method for Tip-Timing Signals Analysis with Non Stationary Engine Rotation Frequency

International audienceBlades vibrations must be measured in operations to validate blade design. Tip-timing is one of the classical measurement methods but its main drawback is the generation of sub-sampled and non-uniform sampled signals. This paper presents a new sparse method for tip-timing spectral analysis that makes use of engine rotation variations. Assuming that blade vibration signals yield to line spectra, a sparse signal model is introduced as a linear system. The solution to the problem is obtained by ADMM (Alternating Direction Method of Multipliers) with a ℓ 1-regularization. Results for simulated and real signals are given to illustrate the efficiency of this method. The main advantages of the proposed method are to provide a fast solution and to take into account the variations of the rotation speed. Results show that this approach reduces frequency aliasings caused by the low sampling frequency of the measured signals