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        Somatic Embryogenesis in Cyclamen with Two Explants and Combinations of Plant Growth Regulators

        Neda Jalali,Roohangiz Naderi,Mesbah Babalar,Masoud Mirmasoumi 한국원예학회 2010 Horticulture, Environment, and Biotechnology Vol.51 No.5

        Cyclamen persicum Mill. (Myrsinaceae ) is one of the most important winter pot flowers in the world. It is commercially propagated via F₁-hybrid seeds. Somatic embryogenesis is an efficient method of micropropagation and biotechnological tools for genetic improvement in cyclamen. The effect of initial explants type (leaf and petiole) on callus growth and somatic embryo were studied. Somatic embryos were cultured on modified Murashige and Skoog (MS) medium. Also embryogenic callus was induced on several media containing 2,4-dichlorophenoxyacetic acid (2,4-D) and kinetin (Kin). The greatest amount of callus was observed in two explants on media containing 1 ㎎?L<SUP>-1</SUP> 2,4-D + 0.5 ㎎?L<SUP>-1</SUP> Kin. The optimal responses of somatic emberyogenesis were recorded on media enriched with 4 ㎎?L<SUP>-1</SUP> 2,4-D, 0.1 ㎎?L<SUP>-1</SUP> Kin and leaf explants. These results were obtained from adult plants.

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        Visible light photo-and bioactivity of Ag/TiO_2 nanocomposite with various silver contents

        Ali Akbar Ashkarran,Seyed Mahyad Aghigh,Mona kavianipour,Neda Jalali Farahani 한국물리학회 2011 Current Applied Physics Vol.11 No.4

        Ag/TiO_2 nanocomposite with various silver contents was synthesized by combination of sol-gel and the novel arc discharge methods in liquid. The Ag/TiO_2 nanoparticles were characterized by X-Ray diffraction (XRD), Brunauer Emmett Teller (BET), transmission electron microscope (TEM) and ultra violet-visible absorption spectroscopy (UV-Vis). The visible light antibacterial activities and photocatalytic properties were successfully demonstrated for the inactivation of Escherichia coli (E-coli) bacteria and Rhodamine B (Rh. B). The results revealed that the Ag/TiO_2 nanoparticles extended the light absorption spectrum toward the visible region and significantly enhanced the inactivation of E-coli bacteria under visible light irradiation. 0.15 gr Ag/TiO_2 nanoparticles revealed best antibacterial activity while 0.05 gr Ag/TiO_2nanoparticles exhibited highest photocatalytic efficiency. The significant enhancement in the photocatalytic activity and antibacterial properties of Ag/TiO_2 nanoparticles under visible light irradiation can be ascribed to the effect of noble metal Ag by acting as electron traps in TiO_2 band gap. A mechanism for photocatalytic degradation of organic pollutants and antibacterial activity over Ag/TiO_2 nanoparticles was proposed based on our observations.

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