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Search Results: 1 - 10 of 525965 matches for " M-G Dijoux-Franca "
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Acute toxicity and antioxydant property of Striga hermonthica (Del.) Benth (Scrophulariaceae)
M Kiendrebeogo, M-G Dijoux-Franca, CE Lamien, A Meda, D Wouessidjewe
African Journal of Biotechnology , 2005,
Abstract: Plants containing flavonoids have been reported to possess strong antioxidant properties. The aqueous acetone extract of Striga hermonthica was further separated into aqueous and ethyl acetate fractions and assayed for their in vitro antioxidant properties using 2,2-diphenyl-1-picrylhydrazyl (DPPH). The crude extract exhibits a weak antioxidant activity (IC50 of 95.27±2.30 ìg/ml) and an insignificant acute toxicity on mice (LD50: 1753±44 mg/kg). Luteolin was isolated and identified by mean of its spectral data as the main DPPH radical scavenger of the ethyl acetate fraction, exhibiting an IC50 value of 6.80±1.46 ìg/ml. These results suggest an antioxidant potential for S. hermonthica.
Phytochemical Study of Swertia Longifolia
H Hajimehdipoor,M.G Dijoux-Franca,A.M Mariotte,Y Amanzadeh
DARU : Journal of Pharmaceutical Sciences , 2008,
Abstract: Background: Swertia spp. (Gentianaceae) grow widely in eastern and southern Asian countries such as Japan, China and India and are used as traditional remedy for gastrointestinal complains because of their bitter principles. Several studies have been carried out on hypoglycemic, hepatoprotective, mono amino oxidase inhibitory and antidepressant effects of these plants and it has been shown that xanthones and iridoids are responsible for their activities. Purpose of the study: In order to gain better knowledge of endemic plants of Flora Iranica, Swertia longifolia Boiss. growing in the northern parts of Iran, was subjected to phytochemical studies. Methods: Dried and milled aerial parts of the plant were extracted with petroleum ether and ethanol of which results of petroleum ether extract has been reported previously. For purification of ethanol extract, it was acidified with acetic acid and subsequently extracted with chloroform and then with n-butanol. The n-butanol extract was analyzed using different chromatographic methods and the structures of the isolated components were established by means of spectroscopic techniques. Results: Four components including an iridoid glycoside (loganic acid), a secoiridoid glycoside (gentiopicroside), a secoiridoid dilactone (gentiolactone) and a nucleoside (uridine) were isolated from n-butanol extract of the plant. Major conclusion: Similar to other species of Swertia, iridoid and secoiridoid glycosides could be considered as major constituents of Swertia longifolia Boiss.
Molluscan antimicrobial peptides, a review from activity-based evidences to computer-assisted sequences
H Li,M-G Parisi,N Parrinello,M Cammarata
Invertebrate Survival Journal , 2011,
Abstract: Antimicrobial peptides (AMPs) represent the most universal immune effectors. Molluscs constitute the second largest animal phylum, after Arthropods, in term of number of species. Only a negligible number has been investigated regarding AMPs. The choice of the species to be studied relied on their economical importance and availability. First studies on molluscan AMPs dated from 1996 and were based on biological activities of biochemical-purified fractions. Such approach released all the original structures we know, with biological activity sometimes different from one isoform to another. Then, molecular biology techniques were applied to molluscan AMPs starting in 1999. Complete screening of genome expression in various situations became available, as well as some exotic Molluscs, the ones collected from deep-sea hydrothermal vent, for instance. Full sequences of active peptides and precursors, and gene organizations were established. A breakthrough consisted in the discovery of numerous AMP variants, even within the same animal. In addition, computer homology revealed the existence of already known AMPs in new studied molluscan species.
Adapted design of multimedia-facilitated language learning program for children with autism
Lau, Fai-Kim;Yuen, Allan H.K.;Lian, John M-G.;
Psicologia Escolar e Educacional , 2007, DOI: 10.1590/S1413-85572007000300002
Abstract: the aim of this pilot study is to help researchers construct an appropriate multimedia-supported learning program for students who have autism. the results of this pilot study assisted the multimedia learn program designers to pay attention to the need of the development of a clear and simple layout, multiple level of content presentation, and simple but direct audio instructions. the core conclusion is the significance of the need for caring individual differences of these students during the learn process.
Insulator, semiclassical oscillations and quantum Hall liquids at low magnetic fields
Shun-Tsung Lo,Yi-Ting Wang,G Bohra,E Comfort,T-Y Lin,M-G Kang,G Strasser,J P Bird,C F Huang,Li-Hung Lin,J C Chen,C-T Liang
Physics , 2012, DOI: 10.1088/0953-8984/24/40/405601
Abstract: Magneto-transport measurements are performed on two-dimensional GaAs electron systems to probe the quantum Hall (QH) effect at low magnetic fields. Oscillations following the Shubnikov-de Haas (SdH) formula are observed in the transition from the insulator to QH liquid when the observed almost temperature-independent Hall slope indicates insignificant interaction correction. Our study shows that the existence of SdH oscillations in such a transition can be understood based on the non-interacting model.
Composition of the Volatile Components Extracted from the Roots of Scorzonera undulata ssp deliciosa (Guiss) Maire: From Algeria  [PDF]
Brahim Harkati, Salah Akkal, Marie Genevieve Dijoux Franca
Green and Sustainable Chemistry (GSC) , 2012, DOI: 10.4236/gsc.2012.22010
Abstract: The chemical composition of the volatile components of the dried roots of Scorzonera undulata ssp deliciosa collected from Algeria was determined by GC and GC/MS. The obtained results showed that the extracted oil contained nine fatty acids. The major compounds were hexadecanoic acid (42.2%), n-tetradecanoic acid (16.1%), 9-octadecenoic acid (7.7%) and 9-hexadecenoic acid (4.5%).
Spectroscopy of $^{18}$Na: Bridging the two-proton radioactivity of $^{19}$Mg
M. Assié,F. de Oliveira Santos,T. Davinson,F. de Grancey,L. Achouri,J. Alcántara-Nú?ez,T. Al Kalanee,J. -C. Angélique,C. Borcea,R. Borcea,L. Caceres,I. Celikovic,V. Chudoba,D. Y. Pang,C. Ducoin,M. Fallot,O. Kamalou,J. Kiener,Y. Lam,A. Lefebvre-Schuhl,G. Lotay,J. Mrazek,L. Perrot,A. M. Sánchez-Benítez,F. Rotaru,M-G. Saint-Laurent,Yu. Sobolev,N. Smirnova,M. Stanoiu,I. Stefan,K. Subotic,P. Ujic,R. Wolski,P. J. Woods
Physics , 2011, DOI: 10.1016/j.physletb.2012.04.059
Abstract: The unbound nucleus $^{18}$Na, the intermediate nucleus in the two-proton radioactivity of $^{19}$Mg, was studied by the measurement of the resonant elastic scattering reaction $^{17}$Ne(p,$^{17}$Ne)p performed at 4 A.MeV. Spectroscopic properties of the low-lying states were obtained in a R-matrix analysis of the excitation function. Using these new results, we show that the lifetime of the $^{19}$Mg radioactivity can be understood assuming a sequential emission of two protons via low energy tails of $^{18}$Na resonances.
Noise-Free Measurement of Harmonic Oscillators with Instantaneous Interactions
M. Franca Santos,G. Giedke,E. Solano
Physics , 2006, DOI: 10.1103/PhysRevLett.98.020401
Abstract: We present a method of measuring the quantum state of a harmonic oscillator through instantaneous probe-system selective interactions of the Jaynes-Cummings type. We prove that this scheme is robust to general decoherence mechanisms, allowing the possibility of measuring fast-decaying systems in the weak-coupling regime. This method could be applied to different setups: motional states of trapped ions, microwave fields in cavity/circuit QED, and even intra-cavity optical fields.
Amphibia, Anura, Leptodactylidae, Leptodactylus didymus Heyer, Garcia-Lopez and Cardoso, 1996: Distribution extension and geographic distribution map
Venancio, N. M.,Souza, M. B.,Franca, F. G. R.
Check List , 2010,
Abstract: Leptodactylus didymus is a terrestrial frog that inhabits clearings in lowland Amazonian rainforest. Herein wepresent new Brazilian records of this species for Amazonas and Acre states.
The vacuum electromagnetic fields and the Schrodinger picture
A. J. Faria,H. M. Franca,G. G. Gomes,R. C. Sponchiado
Physics , 2005,
Abstract: Several authors have used the Heisenberg picture to show that the atomic transitions, the stability of the ground state and the position-momentum commutation relation [x,p]=ih, can only be explained by introducing radiation reaction and vacuum electromagnetic fluctuation forces. Here we consider the simple case of a nonrelativistic charged harmonic oscillator, in one dimension, to investigate how to take into account the radiation reaction and vacuum fluctuation forces within the Schrodinger picture. We consider the effects of both classical zero-point and thermal electromagnetic vacuum fields. We show that the zero-point electromagnetic fluctuations are dynamically related to the momentum operator p=-ih d/dx used in the Schrodinger picture. Consequently, the introduction of the zero-point electromagnetic fields in the vector potential A_x(t) used in the Schrodinger equation, generates ``double counting'', as was shown recently by A.J. Faria et al. (Physics Letters A 305 (2002) 322). We explain, in details, how to avoid the ``double counting'' by introducing only the radiation reaction and the thermal electromagnetic fields into the Schrodinger equation.
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