168 research outputs found
Chemical Composition and Activity of Essential Oils of Carissa macrocarpa (Eckl.) A.DC. Cultivated in Tunisia and its Anatomical Features
No full textThis is the first study investigating the chemical composition of essential oils (EOs) isolated from different tissues of Carissa macrocarpa (Eckl.)A.DC, their antimicrobial activity and the anatomical characters of the aerial organs and the fruits. The main EO components were pentadecanal and tetradecan-1-ol (31.9 and 16.5% in fresh leaf EO, resp.), (E)-nerolidol and caryophyllene oxide (27.3 and 15.0% in fruit EO, resp.), linalool and hexahydrofarnesyl acetone (30.9 and 24.9% in stem EO, resp.), benzyl benzoate (24.3% in flower EO). The fruit EO was more active against Candida albicans (MIC=0.46 mg/mL) compared to the reference antibiotic (17.66 mg/mL). Furthermore, at this concentration it inhibited all the Gram-positive bacteria. Concerning the anatomical features, it is noteworth the presence of a large cluster of Ca oxalate crystals inside some parenchymatous cells. Large ducts corresponding to non articulated laticifers were identified in the cortex of leaf, stem and fruit pericarp. The laticifers categories and their distribution are taxonomically important to discriminate this species from others acclimated in different countries. Considering the obtained results, EOs of C. macrocarpa can be a good source of antimicrobial compounds, contributing to solve the problem of microbial resistance to antibiotics. This article is protected by copyright. All rights reserved
Valorization of the Green Waste from Two Varieties of Fennel and Carrot Cultivated in Tunisia by Identification of the Phytochemical Profile and Evaluation of the Antimicrobial Activities of Their Essentials Oils
No full textThe purpose of this study was to identify the chemical composition and the antibacterial activity of the essential oils (EOs) extracted from the green tops of Daucus carota L. subsp. sativus (Hoffm.) Arcang. plants producing yellow roots (DcsYR) and those producing orange roots (DcsOR) and from two varieties of Foeniculum vulgare subsp. vulgare cultivated in Tunisia. Analyses revealed that the EOs from the two D. carota varieties were rich in constituents belonging to sesquiterpenes. Phenylpropanoids and non-terpene derivatives were the most abundant classes of compounds in the EOs from the two varieties of F. vulgare, of which compositions were predominated by (E)-anethole and p-acetonylanisole. All the tested EOs were significantly more effective against Gram-negative bacteria, and that obtained from var. azoricum was more active against the yeast Candida albicans than the reference drug. The EOs obtained from these by-products showed indeed interesting potential to be promoted as natural antimicrobials in food preservation systems, as well as the possibility to be used in flavor industries
Le travail informel : retour sur une notion floue. Remarques à partir du cas des entreprises françaises délocalisées au Maroc
No full textBased on the critical literature as well as on observations collected by the author for the preparation of his Ph. D. thesis, the article addresses the definition and the characterization of the main types of informal employment, the status of work in Morocco, and examines in more detail some atypical forms of work and employment which are related to the operation of French enterprises located in this country (the “ chaouch”, the maid, the …).L’article interroge la définition et les formes du travail informel dans le contexte sociétal marocain à partir de la littérature critique et des observations recueillies dans le cadre d’une thèse de doctorat en Sociologie. A la lumière des données collectées, on développe quelques remarques sur le statut du travail dans la société marocaine et on examine de façon plus précise la problématique du maintien de certaines figures atypiques en relation avec les entreprises françaises délocalisées au Maroc («chaouch » , bonne, porteur).Labari Brahim. Le travail informel : retour sur une notion floue. Remarques à partir du cas des entreprises françaises délocalisées au Maroc. In: Cahiers de sociologie économique et culturelle, n°41-42, 2004. pp. 71-93
Isotomurus maculatus
No full text50. Isotomurus maculatus (Schäffer, 1896) (Fig. 10) Citation from Edough: Hamra-Kroua (2016: 86); Zoughailech (2017: 137). Not cited from Algeria outside Edough. Distribution: Distribution unclear, requires revision (Fjellberg 2007). The color pattern is slightly different from the specimens from Norway figured by this author and from Italy figured by Carapelli et al. (1995).Published as part of Brahim-Bounab, Hayette, Bendjaballah, Mohamed, Hamra-Kroua, Salah, Lachi, Noureddine, Bedos, Anne & Deharveng, Louis, 2020, Checklist of the springtails (Hexapoda: Collembola) of the Edough massif northeastern Algeria, pp. 51-78 in Zootaxa 4853 (1) on page 68, DOI: 10.11646/zootaxa.4853.1.3, http://zenodo.org/record/441036
Real-Time Fault Detection and Identification for MMC Using 1-D Convolutional Neural Networks
No full textAutomated early detection and identification of switch faults are essential in high-voltage applications. Modular multilevel converter (MMC) is a new and promising topology for such applications. MMC is composed of many identical controlled voltage sources called modules or cells. Each cell may have one or more switches and a switch failure may occur in anyone of these cells. The steady-state normal and fault behavior of a cell voltage will also significantly vary according to the changes in the load current and the fault timing. This makes it a challenging problem to detect and identify such faults as soon as they occur. In this paper, we propose a real-time and highly accurate MMC circuit monitoring system for early fault detection and identification using adaptive one-dimensional convolutional neural networks. The proposed approach is directly applicable to the raw voltage and current data and thus eliminates the need for any feature extraction algorithm, resulting in a highly efficient and reliable system. Simulation results obtained using a four-cell, eight-switch MMC topology demonstrate that the proposed system has a high reliability to avoid any false alarm and achieves a detection probability of 0.989, and average identification probability of 0.997 in less than 100 ms. - 2018 IEEE.Manuscript received October 23, 2017; revised February 11, 2018 and March 27, 2018; accepted April 16, 2018. Date of publication May 3, 2018; date of current version June 28, 2019. This work was supported by the National Priorities Research Program award (NPRP10-1203-160008) from the Qatar National Research Fund, a member of the Qatar Foundation. (Corresponding author: Serkan Kiranyaz.) S. Kiranyaz, A. Gastli, L. Ben-Brahim, and N. Al-Emadi are with the Department of Electrical Engineering, Qatar University, Doha 2713, Qatar (e-mail: [email protected]; [email protected]; [email protected]; [email protected]).Scopu
Analysis of the use of some statistical measures in deciding about the efficiency of an image encryption algorithm
No full textSminthurinus signatus
No full textSminthurinus signatus (Krausbauer, 1898) Sminthurus aureus var. signata Krausbauer, 1898: 496. Sminthurinus signatus – Deharveng 1976: 81. NEW DATA. — First record of the species for Algeria. DISTRIBUTION. — Probably Europe (not recognized in Bretfeld 1999). REMARK Very rare in our samples. The literature about this species is confusing. It is listed in Bretfeld (1999), who follows Stach (1956), as a subspecies of Sminthurinus elegans, with Krausbauer, 1902 given as author. In fact, it was described by this last author as Sminthurus aureus var. signata in 1898, and briefly but clearly characterized by its color pattern. It is very characteristic and common in western Europe (Thibaud 2017), and fully deserves a specific status. Family SMINTHURIDAE Börner, 1913 Genus Allacma Börner, 1906Published as part of Bendjaballah, Mohamed, Zoughailech, Abdelmalek, Brahim-Bounab, Hayette, Hamra-Kroua, Salah, Bedos, Anne & Deharveng, Louis, 2018, Annotated checklist of the springtails (Hexapoda: Collembola) of the Collo massif, northeastern Algeria, pp. 389-414 in Zoosystema 40 (16) on page 410, DOI: 10.5252/zoosystema2018v40a16, http://zenodo.org/record/433596
DETECTION DES LESIONS LUMINEUSES DANS LES IMAGES RETINIENNES
No full textL’objectif du travail consiste à développer des outils de traitement et d’analyse des
images couleur du fond d’oeil pour la détection des lésions lumineuses : Les druses et les
exsudats ; signes de la rétinopathie diabétique RD et la dégénérescence maculaire liée à l’âge
DMLA respectivemen
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