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Samson Zeray Tesfay, Sakhile Mathe, Albert T. Modi, and Tafadzwanashe Mabhaudhi

Commercially available leafy vegetables are known for their nutritional properties, mostly rich in antioxidants ( Shukla et al., 2006 ). Consuming these leafy vegetables that contain various antioxidant compounds may therefore boost the immune

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Zoltán Pék, Lajos Helyes, and Andrea Lugasi

high levels of antioxidants ( Abushita et al., 2000 ), which are important in the prevention of many cancer types and cardiovascular diseases ( Takeoka et al., 2001 ). Color is one of the most important quality components of tomato fruits. The amount of

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Zoltán Pék, Péter Szuvandzsiev, András Nemenyi, Lajos Helyes, and Andrea Lugasi

Tomato ( Solanum lycopersicum L.) is one of the most important vegetable food crops of the world ( FAOSTAT, 2008 ). Year-round availability, a high rate of consumption, and significant levels of antioxidants such as ascorbic acid, β-carotene, γ

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Alvaro Standardi and Fausto Romani

In vitro-proliferated shoots of `Delicious' and `Starkspur Red' apples (Malus domestica Borkh.) were submitted for 1 week to root induction in the dark with their basal parts in liquid medium containing 1.5 μm IBA and 43.4 mm sucrose. The shoots were transferred to root initiation and root elongation medium made up of plugs wetted with half-strength Lepoivre salts. When antioxidants, such as PVP, GH, 2-Me, and DIECA, were added to the liquid induction medium, the percentages of rooting usually decreased. In contrast, if the antioxidants PVP and citric acid were added in the initiation-elongation medium, the percentages of rooting increased. The results agree with the finding of other researchers who proposed a rapid increase in peroxidase activity during root induction followed by a fast decline during rooting initiation as a marker for good rooting responses. Moreover, the use of antioxidants both in induction and in initiation-elongation had no effect on number and length of roots. Chemical names used: polyvinylpyrrolidone-40 (PVP); glutathione reduced (GH); 2-mercaptoethanol (2-Me); diethyldithiocarbamic acid, sodium salt trihydrate (DIECA); N-(phenylmethyl) 1 H-purin-6-amine (BA); 1 H-indole-3-butyric acid (IBA); gibberellic acid (GA3).

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Myung-Min Oh, Edward E. Carey, and C.B. Rajashekar

benefits in preventing many chronic and degenerative diseases ( Arai et al., 2000 ; Berger, 2005 ; Block et al., 1992 ; Buring and Hennekens, 1997 ). This is because they are rich in numerous phytochemicals, including antioxidants ( DellaPenna, 1999

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Federica Galli, Douglas D. Archbold, and Kirk W. Pomper

events such as fruit ripening increase the production of ROS in plant tissues, causing tissue damage. Under normal stress conditions, adequate protection against destructive ROS reactions is provided by cellular antioxidant defense systems, including

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Antonios Petridis, Magdalene Koukourikou, Thomas Sotiropoulos, and Dimitrios Stylianidis

Various studies have demonstrated a close link between oxidative stress and development of different ailments such as cancer and cardiovascular and neurodegenerative diseases ( Halvorsen et al., 2002 ). The human body has an antioxidant defense

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Zhibin Fan, Kai Zhang, Fengyun Wang, Xiaodan Zhao, Ruiqin Bai, and Boling Liu

by the enzymatic antioxidant system, including superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and ascorbate peroxidase (APX) ( Bowler et al., 1994 ). In general, secondary metabolites of most medicinal plants are flavonoids or phenols

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Shiow Y. Wang and Kim S. Lewers

Antioxidants are compounds that can delay or inhibit the oxidation of lipid or other molecules by inhibiting oxidizing chain reactions and they play an important role in health protection ( Velioglu et al., 1998 ). In addition to being rich in

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Anne Frary, M. Ali Keçeli, Bilal Ökmen, Hasan Ö. Şιğva, Ahmet Yemenicioğlu, and Sami Doğanlar

contains vitamins A, B, C, and E and phytochemicals such as phenolic compounds, carotenoids, and capsaicin ( USDA Nutrient Data Laboratory, 2007 ). These compounds are reported to have a multitude of favorable effects for humans, including antioxidant