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Evaluation of Antimycotic Activity of Extracts of marine Algae Collected from Red Sea Coast, Jeddah, Saudi Arabia

Journal of Biosciences and medicines 2018年第4期6卷 51-68页

作者： Huda Sheikh Amal el-Naggar Danyah Al-Sobahi Department of Biological Science Science Faculty for Girls King Abdulaziz University Jeddah KSA Botany Department Faculty of Science Tanta University Tanta Egypt makkah KSA

In the present study, fifteen species of the dominant marine algae were collected during summer 2013 from four selected sites on Red sea coast, Jeddah, Saudi Arabia. The collected species belonged to Chlorophyta, Phaeophyta and Rhodophyta. Crude algal extracts were prepared by successive extractions using different solvents (acetone, ethanol, diethyl ether, ethyl acetate, methanol and petroleum ether). The crude algal extracts were examined for their antifungal efficacy against Aspergillus flavus, Aspergillus fumigatus, Aspergillus niger, Candida albicans and Candida tropicalis using agar well diffusion method. The algal extracts evoked different patterns of antifungal activities. Results reveal that acetone was the best solvent suited for extraction of bioactive compounds from tested seaweeds with inhibition activity (19.3%) followed by ethyl acetate (17.1%), ethanol (16.4%), petroleum ether (15.9%), diethyl ether (15.85%), and finally methanol (15.4%). Chlorophyta exhibited the highest antimycotic effect followed by Rhodophyta and Phaeophyta. In Chlorophyta, the extracts of Ulva intestinalis were the most potent followed by U. lactuca, C. racemosa, U. linza and U. reticulate. Acanthophora spicifera showed the highest activity in Rhodophyta, followed by J. rubens, D. simplex, L. obtusa, G. gracilis, G. vermicuphylla and G. multipartita. Whereas, T. triquetra was the most effective species in Phaeophyta followed by P. pavonica and D. dichotoma. The minimal inhibitory concentrations (mICs) of the most potent algal extracts were in the range of 0.5 to 4 mg/ml. The results confirmed the antimycotic potentiality of seaweed extracts.

关键词： marine Algae Seaweeds Antifungal Activity Solvent Extracts minimal Inhibitory Concentrations (mICs)

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Condensation Heat Transfer in Horizontal Non-Circular microchannels

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Energy and Power Engineering 2013年第9期5卷 577-586页

作者： Hicham.el mghari mohamed Asbik Hasna Louahlia-Gualous LP2mS URAC08Universite Moulay IsmailFaculte des SciencesMeknesMaroc LUSAC Universite de Caen Basse NormandieSaint LoFrance

This investigation contributes to a better understanding of condensation heat transfer in horizontal non-circular microchannels. For this purpose, the conservation equations of mass, momentum and energy have been numerically solved in both phases (liquid and vapor), and all the more, so the film thickness analytical expression has been established. Numerical results relative to variations of the meniscus curvature radius, the condensate film thickness, the condensation length and heat transfer coefficients, are analyzed in terms of the influencing physical and geometrical quantities. The effect of the microchannel shapes on the average Nusselt number is highlighted by studying condensation of steam insquare, rectangular and equilateral triangular microchannels with the same hydraulic diameter of 250 μm.

关键词： Condensation microchannel Numerical Simulation Capillary Regime Heat Transfer

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Square Wave Voltammetry for Analytical Determination of Cadmium in Natural Water Using Ca10(PO4)6(OH)2-modified Platinum.electrode

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American Journal of Analytical Chemistry 2010年第3期1卷 150-158页

作者： moulay Abderrahim.el mhammedi mounia Achak mina Bakasse 不详

This paper reports on the development of a novel electrochemical assay for cadmium (II) in natural water, which involves the use of disposable hydroxyapatite modified platinum.electrode (HAP/Pt). Cadmium (II) was preconcentrated on the surface of the modified electrode and adsorbed onto HAP and oxidized at E = –680 mV. The HAP-modified platinum.electrode exhibited superior performance in comparison to the plati- num.electrode and surprisingly, yielded a higher electrochemical response. The best defined anodic peak was obtained with 0.2 mol L-1 KNO3 pH 5.0 after 25 min of accumulation time. Using these conditions, the cali- bration plot was linear over the range 1 × 10?8 to 5 × 10?6 mol L-1 Cd2+. The precision was examined by car- rying out eight replicate measurements at a concentration of 2.5 ×10?5 mol L-1;the coefficient of variation was 2.9%. The method was applied to the determination of the analyte in river water samples. The interfere- ence of other metal ions on the voltammetric response of Cd(II) was studied. The HAP films was clearly ob- served in the SEm images and characterized by X-ray diffraction, IR spectroscopy and chemical analysis.

关键词： Hydroxyapatite Cadmium Platinum electrode Square Wave Voltammetry

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Optical and electrical properties of electrochemically deposited polyaniline/CeO2 hybrid nanocomposite film

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Journal of Semiconductors 2011年第4期32卷 25-30页

作者： Anees A.Ansari m.A.m.Khan m.Naziruddin Khan Salman A.Alrokayan m.Alhoshan m.S.Alsalhi King Abdullah Institute for Nanotechnology King Saud UniversityRiyadh-11451P.O.Box-2454Saudi Arabia Department of Chemical Engineering King Saud UniversityP.O.Box 800Riyadh 11421Saudi Arabia

This paper reports the optical and electrical properties of electrochemically deposited polyaniline （PANI）/cerium oxide（CeO;） hybrid nano-composite film onto indium-tin-oxide（ITO） glass ***-visible spectroscopy andⅠ-Ⅴcharacteristic were performed to study the optical and electrical parameters of the electrochemically deposited *** film exhibited a strong absorption below 400 nm（3.10 eV） with a well defined absorbance peak at around 285 nm（4.35 eV）.The estimated band gap of the CeO;sample was 3.44 eV,higher than bulk CeO;powder（E;= 3.19 eV） due to the quantum confinement *** and electrochemical characteristics indicated that the electrical properties of PANI/CeO;hybrid nanocomposite film arc dominated by PANI doping.

关键词： cerium oxide polyaniline nanocomposite optical properties electrical properties

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几种杀虫剂对棉铃虫的联合作用

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世界农药 1980年第4期 30-33页

作者： m.A.el-Guindy m.m.Abdel-Sattar A.A.el-Refai 潘大钧埃及农业部植物保护研究所中央农药实验室埃及农业部植物保护研究所中央农药实验室埃及el-Azhar大学植保系主任

在1973～1975年间的棉花生长季节,埃及发生了严重危害棉花生长的棉铃虫(Heliothisarmigera)大猖獗,促进了几种杀虫剂对棉铃虫的毒效和二元混合杀虫剂的联合作用的研究,所获得的资料将有助于埃及棉铃虫的未来化学防治。材料和方法饲养技... 详细信息

在1973～1975年间的棉花生长季节,埃及发生了严重危害棉花生长的棉铃虫(Heliothisarmigera)大猖獗,促进了几种杀虫剂对棉铃虫的毒效和二元混合杀虫剂的联合作用的研究,所获得的资料将有助于埃及棉铃虫的未来化学防治。材料和方法饲养技术实验用棉铃虫品系是1973年棉花生长季节由 Fayoum Governorate 棉田里采集的,在温度25℃、相对湿度70%的实验室内饲养。初孵幼虫放在400毫升玻璃容

关键词：毒性点滴法毒力棉铃实夜蛾棉花害虫棉铃虫苯硫磷联合作用

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Calculation of Complete Absorption and Intensity of Optical Radiation Spectrum of HeI (λ= 5875Å) with Fine Structure

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Journal of modern Physics 2011年第6期2卷 564-571页

作者： R. A. el-Koramy N. A Ashurbecov 不详

Theoretical calculations which account for the complete absorption and intensity for the optical radiation He I (λ= 5875 ?) spectral line with fine structure of the transition 23P2,1,0 - 33D3,2,1 during He nanosecond discharge are presented. For different values of the absorption parameter (χ 0?), the absorption quantity A of the three components distorted as a result of reabsorption multiple process has been numerically obtained and graphically presented. The theoretical results for small values of χ 0? (≤4) give a good agreement with the experimental data in literature.

关键词： Optical Radiation Spectrum Complete Absorption Intracavity Laser Spectroscopy Simpson’s Formula Computer Processing

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玫瑰茄光周期反应的研究

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亚热带植物科学 1984年第1期 35-39页

作者： el Afry m.m.,曾华庭

来源于泰国、中美洲、塞内加尔、印度和埃及的五个玫瑰茄品系,在光周期为8、16和24小时的人工气候室内生长。通过短日照和连续光照诱导开花证实,所有品系均为双光周期。各品系在花、果发育和由短日照转变到长日照后持续地成花诱导中显... 详细信息

来源于泰国、中美洲、塞内加尔、印度和埃及的五个玫瑰茄品系,在光周期为8、16和24小时的人工气候室内生长。通过短日照和连续光照诱导开花证实,所有品系均为双光周期。各品系在花、果发育和由短日照转变到长日照后持续地成花诱导中显出差异。短日照和连续光照产生的生理效应和形态效应均不同。在每个叶腋的两个成对芽中,左芽在光周期为8和24小时成花,在光周期16小时保持休眠;右芽在8小时保持休眠,在16小时发育成营养枝,而在24小时发育成花枝。作者讨论了这些资料对亚热带条件下玫瑰茄育种和栽培的重要意义。

关键词：玫瑰茄日照长度埃及木槿属北非光周期反应光照短日照

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NLO response of derivatives of benzene, stilbene and diphenylacetylene：mP2 and DFT calculations

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Chinese Journal of Chemical Engineering 2017年第6期25卷 800-808页

作者： A.m. elhorri m. Zouaoui-Rabah Laboratoire de microscopie Microanalyse et Spectroscopie Mol&ulaire Faculty of Sciences Djillali Liabes University of Sidi-Bel-Abbes 22000 Sidi-BeI-Abbes Algeria

mP2 method and different functionals such as m06-HF, m06-2X, CAm-B3 LYP, PBE0, B3 LYP and m06 L incorporating different XC amounts were used to calculate the static first hyperpolarizabilies β(0) of eight molecules which are derivatives of benzene, stilbene and diphenylacetylene. The values were then compared to the experimental ones. The m06-2X functional was then selected for further calculations. NBO calculations were also performed to define the intramolecular charge transfer in each molecule. TD-DFT calculations were performed taking into account the solvent effect using the IEF-PCm formalism. Some parameters characterizing the vertical transitions such as the wavelength of the maximum absorption λ_(max) were compared to the experimental ones. Finally,solvation Gibbs free enthalpy ΔG_(solv) values have also been examined in order to determine which the specific solvent for a given molecule is.

关键词： First hyperpolarizability DFT TD-DFT Push-pull molecules NBOCharge transfer

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Approximate energies and thermal properties of a position-dependent mass charged particle under external magnetic fields

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Chinese Physics B 2017年第6期26卷 22-30页

作者： m Eshghi H mehraban S m Ikhdair Young Researchers and elite Club Central Tehran BranchIslamic Azad UniversityTehranIran Faculty of Physics Semnan UniversitySemnanIran Department of Physics Faculty of ScienceAn-Najah National UniversityNablusWest BankPalestine Department of electrical Engineering Near East UniversityNicosiaNorthern CyprusMersin 10Turkey

We solve the Schrodinger equation with a position-dependent mass（PDm） charged particle interacted via the superposition of the morse-plus-Coulomb potentials and is under the influence of external magnetic and Aharonov–Bohm（AB） flux fields. The nonrelativistic bound state energies together with their wave functions are calculated for two spatially-dependent mass distribution functions. We also study the thermal quantities of such a system. Further, the canonical formalism is used to compute various thermodynamic variables for second choosing mass by using the Gibbs formalism. We give plots for energy states as a function of various physical parameters. The behavior of the internal energy, specific heat, and entropy as functions of temperature and mass density parameter in the inverse-square mass case for different values of magnetic field are shown.

关键词： Schr?dinger equation morse-plus-Coulomb potentials position-dependent mass distribution functions perpendicular magnetic and Aharonov–Bohm flux fields

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Adipocytes modulate vascular smooth muscle cells migration potential through their secretions

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Journal of Diabetes mellitus 2013年第4期3卷 227-235页

作者： Souhad el Akoum Isabelle Cloutier Jean-Francois Tanguay montreal Heart Institute MontrealCanada Departement de Sciences Biomedicales Facultede MedecineUniversitede MontrealMontrealCanada

Impairment of vascular smooth muscle cells (VSmC) is recognized as a predisposition factor for atherosclerosis development. We hypothesize that the metabolic syndrome has a direct impact on VSmC migration and phenotypic switching, which may increase the incidence of atherosclerotic events. Aortic VSmC were extracted from 10 weeks old C57BL6 mice and incubated for 24 hr in adipocytes conditioned cell culture medium. Adipocytes were extracted from diabetic C57BL6 male mice fed with either a vegetal or an animal High-Fat-Diet (HFD) for 20 weeks. migration of VSmC in response to conditioned media stimulations was significantly modulated compared to control. The most extended effects on VSmC were triggered by adipocytes from mice fed with animal HFD. These effects were concurrent with increased leptin concentrations and decreased adiponectin levels in conditioned media. A significant up-regulation of CD36 mRNA level was found in VSmC treated with adipocytes from HFD-fed mice. In conclusion, we have shown that the development of adipocyte-induced VSmC alterations is linked to diet fatty acid composition and the degree of metabolic alterations. The modulation of adipokine secretions in the adipose tissue that is linked to metabolic alterations may alter the physiology of VSmC and thus accelerate the development of metabolic-related vascular diseases.

关键词： Adipocytes Atherosclerosis Type 2 Diabetes Vascular Smooth muscle Cells migration

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