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Plasmonic-like waves on a chain of capacitively coupled rings of quantum dot tetramers
S. Younos Feizabadi,Farshad Ebrahimi 한국물리학회 2016 Current Applied Physics Vol.16 No.9
In this paper, we consider a linear structure consisting of a specific array of capacitively coupled identical rings of quantum dot tetramers (QDT), where each ring consists of four, nearest neighbor tunnel-coupled, single-orbital quantum dots (QD) in the presence of Aharonov-Bohm (AB) magnetic flux. We show that due to a.c properties of QDT ring when subjected to AB flux, low frequency plasmonic-like waves can propagate on such a structure. Using exact diagonalization method, we, at first, determine the a.c responses and admittances between pairs of QDs in a single ring of QDT when threaded by AB flux. We then, using linear response theory, consider a specific array of identical QDT rings where each ring is coupled capacitively to its nearest neighbors.We present the necessary formulas and derive the equation for determining the dispersion relation and cut-off frequency. Finally, we numerically demonstrate the influence of the AB flux and the strength of coupling between the rings on the bandwidth of dispersion relation and its cut-off frequency.
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Bouayed, Jaouad,Rammal, Hassan,Dicko, Amadou,Younos, Chafique,Soulimani, Rachid The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.4
Epidemiological and scientific research has contributed to the identification of the key role of dietary antioxidants in maintaining human health by preventing oxidative damage to cellular components. The antiradical activity of seven varieties of plums and their protective effects against oxidative stress were comparatively evaluated in mouse granulocytes in this study using a 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) test and a cellular test. The class of phytochemical compounds responsible for the main antioxidant capacities observed was also investigated. The ABTS and cellular tests revealed that the total antioxidant capacities, expressed as vitamin C equivalents, ranged from 691.2 to 2,164.64 mg and from 613.98 to 2,137.59 mg per 100 g of fresh weight, respectively, suggesting that plums are rich in natural antioxidants and appreciably protect granulocytes from oxidative stress. Our results showed a linear correlation between either total phenolic or flavonoid contents and total antioxidant capacity, revealing that these compounds contribute significantly to the antioxidant activity of plums. The major polyphenolics in plums, identified and quantified using reversed-phase high-performance liquid chromatography, were tested to evaluate their protective effect on peripheral blood granulocytes from oxidative stress. The results suggest that individual polyphenolics contribute directly to the total protective effect of plums.
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Jaouad Bouayed,Hassan Rammal,Amadou Dicko,Chafique Younos,Rachid Soulimani 한국식품영양과학회 2009 Journal of medicinal food Vol.12 No.4
Epidemiological and scientific research has contributed to the identification of the key role of dietary antioxidants in maintaining human health by preventing oxidative damage to cellular components. The antiradical activity of seven varieties of plums and their protective effects against oxidative stress were comparatively evaluated in mouse granulocytes in this study using a 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) test and a cellular test. The class of phytochemical compounds responsible for the main antioxidant capacities observed was also investigated. The ABTS and cellular tests revealed that the total antioxidant capacities, expressed as vitamin C equivalents, ranged from 691.2 to 2,164.64mg and from 613.98 to 2,137.59mg per 100g of fresh weight, respectively, suggesting that plums are rich in natural antioxidants and appreciably protect granulocytes from oxidative stress. Our results showed a linear correlation between either total phenolic or flavonoid contents and total antioxidant capacity, revealing that these compounds contribute significantly to the antioxidant activity of plums. The major polyphenolics in plums, identified and quantified using reversed-phase high-performance liquid chromatography, were tested to evaluate their protective effect on peripheral blood granulocytes from oxidative stress. The results suggest that individual polyphenolics contribute directly to the total protective effect of plums.
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Chemical Composition and Antioxidant Potential of Ruta montana L. Essential Oil from Algeria
N. Kambouche,B. Merah,S. Bellahouel,J. Bouayed,A. Dicko,A. Derdour,C. Younos,R. Soulimani 한국식품영양과학회 2008 Journal of medicinal food Vol.11 No.3
The essential oil of aerial parts of Ruta montana L. growing in the Oran region in the west of Algeria was obtained by hydrodistillation with a 1.63% yield on a dry weight basis. Gas chromatography (GC) and GC/mass spectrometry (MS) analyses were carried out to identify the chemical composition of R. montana essential oil. Moreover, spectrophotometric analyses were employed to highlight the scavenger capacity of this oil using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) test. Twenty compounds were identified by GC and CG/MS analyses, and the bulk of the compounds of the oil were undecan-2-one (32.8%), nonan-2-one (29.5%), nonanol-2-acetate (18.2%), and psoralen (3.5%). The results obtained using the DPPH test show that R. montana essential oil possesses antiradical activity in a concentration-dependent manner. Thus, a linear correlation (correlation coefficient R2 = 0.971, P < .001) was found between the reduction of DPPH stable free radical and the concentration of R. montana essential oil.
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