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Search Results: 1 - 10 of 295 matches for " Loussaif Amira "
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Antioxidant, genotoxic and antigenotoxic activities of daphne gnidium leaf extracts
Chaabane Fadwa,Boubaker Jihed,Loussaif Amira,Neffati Aicha
BMC Complementary and Alternative Medicine , 2012, DOI: 10.1186/1472-6882-12-153
Abstract: Background Plants play a significant role in maintaining human health and improving the quality of human life. They serve humans well as valuable components of food, as well as in cosmetics, dyes, and medicines. In fact, many plant extracts prepared from plants have been shown to exert biological activity in vitro and in vivo. The present study explored antioxidant and antigenotoxic effects of Daphne gnidium leaf extracts. Methods The genotoxic potential of petroleum ether, chloroform, ethyl acetate, methanol and total oligomer flavonoid (TOF) enriched extracts from leaves of Daphne gnidium, was assessed using Escherichia coli PQ37. Likewise, the antigenotoxicity of the same extracts was tested using the “SOS chromotest test”. Antioxidant activities were studied using non enzymatic and enzymatic method: NBT/Riboflavine and xantine oxidase. Results None of the different extracts produced a genotoxic effect, except TOF extract at the lowest tested dose. Our results showed that D. gnidium leaf extracts possess an antigenotoxic effect against the nitrofurantoin a mutagen of reference. Ethyl acetate and TOF extracts were the most effective in inhibiting xanthine oxidase activity. While, methanol extract was the most potent superoxide scavenger when tested with the NBT/Riboflavine assay. Conclusions The present study has demonstrated that D. gnidium leaf extract possess antioxidant and antigenotoxic effects. These activities could be ascribed to compounds like polyphenols and flavonoid. Further studies are required to isolate the active molecules.
Energy β-Conformal Change and Special Finsler Spaces  [PDF]
Amr Soleiman, Amira A. Ishan
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.47132
Abstract:

The main aim of the present paper is to establish an intrinsic investigation of the energy β-conformal change of the most important special Finsler spaces, namely, Ch-recurrent, Cv-recurrent, C0-recurrent, Sv-recurrent, quasi-C-reducible, semi-C-reducible, C-reducible, P-reducible, C2-like, S3-like, P2-like and h-isotropic, ···, etc. Necessary and sufficient conditions for such special Finsler manifolds to be invariant under an energy β-conformal change are obtained. It should be pointed out that the present work is formulated in a prospective modern coordinate-free form.

The Psychological Profile of Youth Male Soccer Players in Different Playing Positions  [PDF]
Amira Najah, Riadh Ben Rejeb
Advances in Physical Education (APE) , 2015, DOI: 10.4236/ape.2015.53020
Abstract: The purpose of this study was to investigate selected psychological skills of male youth soccer players in different playing positions. This study examined possible positional differences of 180 male youth Tunisian soccer players between the ages of 15 and 19 years old from different clubs of 1st and 3rd Youth Class divisions. The subjects were divided into three playing positions, namely, forward (n = 60), midfield (n = 60) and defense (n = 60), and compared with regard to twelve psychological skills measured by means of the Ottawa Mental Skills Assessment Tool (OMSAT-3) of Durand Bush et al. (2001). Results yielded significant differences between basic and psychosomatic subscale scores of the players in different playing positions. Forward players consistently outperformed the other positional groups in motivation, confidence and activation. Defense players outperformed the other positional groups in relaxation, while midfield players showed the lowest psychological skill levels. The results of the study provided support for the hypothesis that positional differences in terms of psychological skills existed. More specifically, statistical evidence suggested that youth soccer players could be differentiated as a function of psychological skill and the position that they played on the team.
Resolving the Vacuum Catastrophe: A Generalized Holographic Approach  [PDF]
Nassim Haramein, Amira Val Baker
Journal of High Energy Physics, Gravitation and Cosmology (JHEPGC) , 2019, DOI: 10.4236/jhepgc.2019.52023
Abstract: We address the ~122 orders of magnitude discrepancy between the vacuum energy density at the cosmological scale and the vacuum density predicted by quantum field theory. This disagreement is known as the cosmological constant problem or the “vacuum catastrophe”. Utilizing a generalized holographic model, we consider the total mass-energy density in the geometry of a spherical shell universe (as a first order approximation) and find an exact solution for the currently observed critical density of the universe. We discuss the validity of such an approach and consider its implications to cosmogenesis and universal evolution.
Synthesis of some nucleosides derivatives from L- rhamnose with expected biological activity
Amira Ghoneim
Chemistry Central Journal , 2011, DOI: 10.1186/1752-153x-5-7
Abstract: Rhamnose is a component of the outer cell membrane of acid-fast bacteria in the Mycobacterium genus, which includes the organism that causes tuberculosis [1-3]. Rhamnose has no role in mammalian metabolism so that compounds which interfere specifically with rhamnose metabolism should not have any deleterious effect on humans. It is possible that a chemotherapeutic approach to the treatment of diseases induced by mycobacteria, such as tuberculosis and leprosy, would be to find compounds which inhibit either the biosynthesis of Tdp-rhamnose or its subsequent incorporation into the cell wall. The term spironucleoside was introduced in 1990 to designate a class of spiranic sugar derivatives in which the anomeric carbon belongs to both the sugar ring and to a heterocyclic base [4-6].Data on this type of compound were reported before 1990 but, as far as we are aware, without using the term spironucleoside. Of the different classes of nucleosides, the spironucleosides are probably the least well known. In the last eight years, other syntheses of hydantocidin [5], spirofuranoid derivatives of different heterocycles [7], pyranoid analogues of hydantocidin [8].2, 3, 4-Tri-O- acetyl-β-L-rhamnopyranose bromide 3 (Scheme 1) obtained by a known procedure from tetra-O-acetyl-L-rhamnopyranose 2 with HBr in acetic acid [9] was treated with mercury(II) cyanide in dry nitromethane at room temperature to give 2,3,4-tri-O-acetyl-β-L-rhamnopyranose cyanide 4.For the partial hydrolysis of the nitrile moiety in 4 HBr in acetic acid [10] afforded the corresponding (2, 3, 4-tri-O- acetyl-β-L-rhamnopyranose) formamide 5 after 3 h reaction time in 94% yield as an almost analytically pure crystalline product. The anomeric configuration of compounds 4 and 5 has been found to be β according to the measured coupling constants between H-1 and H-2 (J1, 2~6.3 Hz).Photobromination of 5 with bromine in refluxing chloroform [11] gave 6 as an essentially pure product in an almost quantitative yield. Reac
Prevalence of symptoms of depression among patients with chronic kidney disease
O Amira
Nigerian Journal of Clinical Practice , 2011,
Abstract: Objective: Depression is the most common psychiatric illness in patients with chronic kidney disease (CKD). Depression has been shown to affect mortality in end-stage renal disease patients. The objective of this study was to determine prevalence of depressive symptoms among CKD patients. Materials and Methods: A cross-sectional study of patients with CKD (Stages 3-5) attending the renal clinic of a tertiary hospital was conducted. Demographic and clinical data were documented. A self-administered Zung depression questionnaire was administered. The Zung depression questionnaire has 20 weighted questions. Individuals with a total score of 50 are considered to be depressed, while a score of 70 and above is indicative of severe depression. Results: One hundred and eighteen patients and fifty controls were interviewed. There were 73 (61.9%) males and 45 (38.1%) female patients. The mean age did not differ: males 43.8 ± 15.4 years, females 43.2 ± 14.7 yrs, P = 0.83. The prevalence of depression among the CKD patients was 23.7%, while for the control group was 2%; χ2 = 10.14, P < 0.001. Further analysis showed that CKD patients on dialysis were more likely to be depressed than the pre-dialysis patients with frequency of depressive symptoms of 34.5% for dialysis patients versus 13.3% in pre-dialysis patients; χ2 = 6.17, P = 0.01. No difference was observed in the mean Zung score among males, and female patients mean Zung score was 40.1 in females and 40.7 in male patients; P > 0.05. Conclusion: Depression is highly prevalent among our patients with CKD and treatment modality was the major predictor of depression among our patients.
Harmonic Analysis in One-Parameter Metabelian Nilmanifolds
Amira Ghorbel
Symmetry, Integrability and Geometry : Methods and Applications , 2011,
Abstract: Let G be a connected, simply connected one-parameter metabelian nilpotent Lie group, that means, the corresponding Lie algebra has a one-codimensional abelian subalgebra. In this article we show that G contains a discrete cocompact subgroup. Given a discrete cocompact subgroup Γ of G, we define the quasi-regular representation τ=ind_Γ^G 1 of G. The basic problem considered in this paper concerns the decomposition of τ into irreducibles. We give an orbital description of the spectrum, the multiplicity function and we construct an explicit intertwining operator between τ and its desintegration without considering multiplicities. Finally, unlike the Moore inductive algorithm for multiplicities on nilmanifolds, we carry out here a direct computation to get the multiplicity formula.
Review of Ashraf Salama's Book: Transformative Pedagogy in Architecture and Urbanism
Amira Elnokaly
Archnet-IJAR : International Journal of Architectural Research , 2010,
Abstract:
Book Review: Community Participation Methods in Design and Planning - HENRY SANOFF
Amira Elnokaly
Archnet-IJAR : International Journal of Architectural Research , 2009,
Abstract:
Harmonic Analysis in One-Parameter Metabelian Nilmanifolds
Amira Ghorbel
Mathematics , 2011, DOI: 10.3842/SIGMA.2011.021
Abstract: Let $G$ be a connected, simply connected one-parameter metabelian nilpotent Lie group, that means, the corresponding Lie algebra has a one-codimensional abelian subalgebra. In this article we show that $G$ contains a discrete cocompact subgroup. Given a discrete cocompact subgroup $\Gamma$ of $G$, we define the quasi-regular representation $\tau = {\rm ind}_\Gamma^G 1$ of $G$. The basic problem considered in this paper concerns the decomposition of $\tau$ into irreducibles. We give an orbital description of the spectrum, the multiplicity function and we construct an explicit intertwining operator between $\tau$ and its desintegration without considering multiplicities. Finally, unlike the Moore inductive algorithm for multiplicities on nilmanifolds, we carry out here a direct computation to get the multiplicity formula.
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