145 research outputs found
ANTIBACTERIAL ACTIVITY AND GAS CHROMATOGRAPHYâMASS SPECTROMETRY STUDIES OF ALGERIAN ATRIPLEX HALIMUS L.
Objective: The objective of the study was to find out the antibacterial efficacy and identify the main constituents of the essential oil of Atriplex halimus from southwest of Algeria.
Methods: The essential oil from the aerial parts of the endemic plant A. halimus (saltbush in English, qataf in Arabic) collected from the region of Sahara southwest of Algeria was isolated by hydrodistillation and analyzed by gas chromatographyâmass spectrometry. Antibacterial potency of essential oil from this plant has been tested against Staphylococcus aureus (ATCC 29213), Escherichia coli (ATCC 25922), and Bacillus cereus (ATCC11778) by disk diffusion assay.
Results: The essential oil revealed the presence of 14 components, the dominant compounds arecadina-1(10), 4-diene (10.69%), germacrene D (9.79%), octane (9.37%), pelargonaldehyde (9.06%), 3-Furancarboxaldehyde (6.87%), ÎČ-pinene (2.6%), camphene (2.59%), and myrcene (2.10%). The essential oil exhibits very effective antimicrobial activity using disk diffusion assay method with minimum inhibitory concentration ranging from 0.82 ÎŒl/ml to 2.4525 ÎŒl/ml.
Conclusions: This result showed that this native plant may be a good candidate for further biological and pharmacological investigations
CHEMICAL CHARACTERIZATION BY GC-MS FROM THE AERIAL PARTS OF FAGONIA LONGISPINA (ZYGOPHYLLACEAE)
Objective: The objective was to characterize the phytochemical constituents in ethyl acetate (EtOAc) extract from the aerial parts of Fagonia longispina(zygophyllaceae) by gas chromatography-mass spectrometry (GC-MS).Methods: The dried powder of the aerial parts of F. lonjispina was extracted exhaustively with ethanol. The extract was concentrated, diluted withwater and partitioned with EtOAc. The residue of the EtOAc extract was performed using a GC-MS.Results: Chemical constituents of the EtOAcextract of F. Longispina Family (Zygophylaceae) were identified by GC-MS and their relative concentrationswere determined. F. Longispina extract contained 12 compounds: Cis-4-(4 -T-butylcyclohexyl)-4-methyl-2-pentanone (33.33%), 4beta-(tert-butyl)1alpha-(1methylvinyl)cyclohexanemethanol (09.52%), cyclohexyl-2-methylenebutanylketone(14.28%),trans-4-(ĂąâŹât-butylcyclohexyl)-4-methyl2-pentanone(9.52%),2,6,10-trimetyl,14-Ethylne-14pentadecene (6.66%), 2-decen-1-ol(cas) (4.76%), 3,7,11,15-tetramethyl-2-hexadecen-1-ol(2.85%),2-nonen-1-ol (4.76%), citronellylacetate(2.85%), tetratetracontane(3.38%), hexatriacontane(cas) (3.38%), and phytolacetate(4.76%).'Conclusions: This GC-MS study helps to predict the formula and structure of phytoconstituents which can be used as drugs, and further investigationmay leads to the development of drug formulation. These compounds are probably the major players in the antioxidant responses evoked by the plant.Keywords: Etyl acetate extract, Gas chromatography-mass spectrometry analysis, Fagonia longispina
LE COEFFICIENT DâOCCUPATION DU SOL COS ET LA PROMOTION DES TECHNIQUES MODERNES DE LA GESTION URBAINE -CAS DE LA VILLE DâALGER
Les systĂšmes traditionnels de contrĂŽle de la densitĂ©, lors de lâĂ©tablissement du Plan Directeur dâAmĂ©nagement et dâUrbanisme(PDAU) et le Plan dâOccupation du Sols (POS) dont la responsabilitĂ© communale sâexerce, imposent des innovations rapideset fondamentales des techniques modernes de gestion urbaine.Partie intĂ©grante du POS, le coefficient dâoccupation du sol (COS) reprĂ©sente une rĂšgle axiale pour les nouveaux outilsdâurbanisme, il est donc lâĂ©lĂ©ment de base du rĂšglement dâurbanisme.Lâobjet de ce travail est la mise au point dâune mĂ©thode thĂ©orique et analytique du COS, qui met en Ă©vidence ses facteursdĂ©terminants et sa relation avec les espaces fonctionnels de lâhabitat. Ce travail sâintĂ©resse surtout Ă lâĂ©quilibre entre larĂ©glementation concernant le coefficient dâoccupation du sol et son application. Câest une phase importante pour la poursuitedes empreintes et des effets du COS dans la rĂ©alitĂ©,Le travail se termine par un modĂšle dâintĂ©gration informatisĂ©e qui met en reliefs ces relations et leurs interactions.Mots clĂ©s : AlgĂ©rie â AlgerâDensitĂ©âCoefficient dâoccupation des sols COS-Droit de lâurbanisme-Techniques de gestionurbaine-Programme COS
Dive into heritage: a digital documentation platform of world heritage properties in the Arab states region
The world celebrated the 50 years of the World Heritage Convention. With more than 1000 cultural and natural sites, the 1972 World
Heritage Convention is the most widely recognized. It has provided a framework for identifying, documenting, protecting, and
managing the world's cultural and natural heritage with Outstanding Universal Value (OUV). The theme to mark this anniversary is:
âThe Next 50: World Heritage as a Source of Resilience, Humanity and Innovationâ. These are the topics that have inspired the World
Heritage Centre to develop, together with the Member States in the Arab Region, an online platform that leverages digital technologies
to safeguard and promote the UNESCO World Heritage sites and its related intangible heritage, and transmit them to future generations.
This paper discusses the current state of digital documentation of cultural heritage and the related projects/initiatives in the Arab States
region. It presents the UNESCO Dive into Heritage initiative and its first outcomes. It concludes with lessons learned and future steps
for the next phases of the project. First outcomes have revealed the big challenge of 3D data integration and the need to accompany
the implementation stages of the project with capacity building
INFLUENCE DE LâACTIVITE COMMERCIALE SUR LâURBANISATION : CAS DE LA COMMUNE DE BIRKHADEM, ALGER
LâĂ©tude du commerce fait partie de lâĂ©tude des activitĂ©s tertiaires, qui sont Ă la fois cause et consĂ©quence de lâextension urbaine, puisque elles assurent lâanimation et le dynamisme de la vie urbaine. La chute de lâunion des rĂ©publiques soviĂ©tiques (URSS), et la vague de libĂ©ralisations du commerce dans la quasi-totalitĂ© des pays du monde, Ă partir du dĂ©but des annĂ©es quatre-vingt-dix du siĂšcle dernier, nâa pas Ă©pargnĂ© lâAlgĂ©rie qui, elle aussi est passĂ©e dâune Ă©conomie planifiĂ©e caractĂ©risĂ©e par le monopole de lâĂ©tat Ă celle du type libĂ©ral. Ainsi, le commerce Ă lâimportation, dĂ©tenu par quelques dizaines de sociĂ©tĂ© nationale, est cĂ©dĂ© au privĂ© qui a investi le marchĂ© par des milliers dâimportateurs. Lâexemple de la SONACOME, sociĂ©tĂ© dâĂ©tat qui dĂ©tenait le monopole sur lâimportation de la piĂšce dĂ©tachĂ©e et des vĂ©hicule Ă cĂ©dĂ© la place Ă plus de 2283 importateurs privĂ©s1. Ce bouleversement Ă©conomique a concernĂ© aussi le commerce de gros et de dĂ©tail qui, aprĂšs la disparition des sociĂ©tĂ©s dâĂ©tat, dĂ©tiennent actuellement la majoritĂ© de la population occupĂ©e. Ces occupĂ©es permanents et occasionnels travaillent dans des activitĂ©s commerciales lĂ©gales et enregistrĂ©s au niveau du centre national du registre de commerce (CNRC), mais, le plus grand nombre active dans le commerce de maniĂšre informelle. Dans les pages qui suivent nous essayons de voir lâampleur du commerce Ă Birkhadem, une commune dâAlger, et son impact sur le mode dâurbanisation
Parallel Evaluation of Multi-join Queries
A number of execution strategies for parallel evaluation of multi-join queries have been proposed in the literature. In this paper we give a comparative performance evaluation of four execution strategies by implementing all of them on the same parallel database system, PRISMA/DB. Experiments have been done up to 80 processors. These strategies, coming from the literature, are named: Sequential Parallel, Synchronous Execution, Segmented Right-Deep, and Full Parallel. Based on the experiments clear guidelines are given when to use which strategy.
This is an extended abstract; the full paper appeared in Proc. ACM SIGMOD'94, Minneapolis, Minnesota, May 24â27, 199
From component reduced models to reduced modelling of multi-component systems
The present work focuses on the reduced modelling of multi-component systems, in particular on a two stages stamping chain process. Starting from snapshots collected by using the commercial software PAM-STAMP, the non-intrusive sparse-PGD constructor is used in order to build a parametric transfer function of each operation in a separated representation, circumventing the problem of the curse of dimensionality. Moreover, in order to fill the gap between this deterministic solution and the measured fields and safely applied control strategies, data driven-modeling can be employed according to the new âhybrid twinâ methodology
DIVE INTO HERITAGE: A DIGITAL DOCUMENTATION PLATFORM OF WORLD HERITAGE PROPERTIES IN THE ARAB STATES REGION
The world celebrated the 50 years of the World Heritage Convention. With more than 1000 cultural and natural sites, the 1972 World Heritage Convention is the most widely recognized. It has provided a framework for identifying, documenting, protecting, and managing the world's cultural and natural heritage with Outstanding Universal Value (OUV). The theme to mark this anniversary is: âThe Next 50: World Heritage as a Source of Resilience, Humanity and Innovationâ. These are the topics that have inspired the World Heritage Centre to develop, together with the Member States in the Arab Region, an online platform that leverages digital technologies to safeguard and promote the UNESCO World Heritage sites and its related intangible heritage, and transmit them to future generations. This paper discusses the current state of digital documentation of cultural heritage and the related projects/initiatives in the Arab States region. It presents the UNESCO Dive into Heritage initiative and its first outcomes. It concludes with lessons learned and future steps for the next phases of the project. First outcomes have revealed the big challenge of 3D data integration and the need to accompany the implementation stages of the project with capacity building
Global Existence and Regularity for the 3D Stochastic Primitive Equations of the Ocean and Atmosphere with Multiplicative White Noise
The Primitive Equations are a basic model in the study of large scale Oceanic
and Atmospheric dynamics. These systems form the analytical core of the most
advanced General Circulation Models. For this reason and due to their
challenging nonlinear and anisotropic structure the Primitive Equations have
recently received considerable attention from the mathematical community.
In view of the complex multi-scale nature of the earth's climate system, many
uncertainties appear that should be accounted for in the basic dynamical models
of atmospheric and oceanic processes. In the climate community stochastic
methods have come into extensive use in this connection. For this reason there
has appeared a need to further develop the foundations of nonlinear stochastic
partial differential equations in connection with the Primitive Equations and
more generally.
In this work we study a stochastic version of the Primitive Equations. We
establish the global existence of strong, pathwise solutions for these
equations in dimension 3 for the case of a nonlinear multiplicative noise. The
proof makes use of anisotropic estimates, estimates on the
pressure and stopping time arguments.Comment: To appear in Nonlinearit
Comprehensive Analysis of Phytochemical Composition, Antioxidant Potential, and Antibacterial Activity of <em>T. polium</em>
\ua9 2024 by the authors.This study aims to thoroughly examine the chemicals and effects of the ethanol extract from T. poliumâs upper parts. We used the Soxhlet method for extraction, resulting in an extract with a significant yield of 20.6%. Qualitative analysis identified a variety of compounds, such as tannins, saponins, reducing compounds, terpenoids, quinones, and alkaloids. In quantitative analysis using the colorimetric method, we found the extract was rich in total flavonoids (20.78 mg equivalent QE/g DW extract) and total polyphenols (227.43 mg equivalent GAE/g DW extract). To assess antioxidant potential, we used the ferric reducing antioxidant power (FRAP) method, with ascorbic acid and butylated hydroxytoluene (BHT) as standards. The extract showed moderate activity in both the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and FRAP methods at concentrations of 65 \ub5g/mL and 21 mg/mL, respectively. Additionally, we tested the ethanolic extract against various bacteria using the disk diffusion technique on agar medium. The results indicated that the T. polium extract had moderate effectiveness against Gram-negative bacteria like Pseudomonas aeruginosa ATCC 9027 and Escherichia coli ATCC 8739, as well as Gram-positive bacteria like Staphylococcus aureus ATCC 6538 and Bacillus subtilis ATCC 6633. We further investigated the composition of the ethanolic extract through LC-MS/MS analysis, establishing a detailed profile of phenolic compounds, with six flavonoids identified as the main polyphenolic constituents. This thorough evaluation provides insights into the potential therapeutic uses of T. polium
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