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- 저자 : Gurdip Singh Virk (검색결과 2 건)
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Nano oxalates of Fe, Co, Ni: Burning rate modifiers for composite solid propellants
Supriya Singh,Gurdip Singh Virk,Pratibha Srivastava 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
We highlight here current research focused on the catalytic activity of nano oxalates of Fe, Co and Nisynthesized by colloidal precipitation method. The catalytic activity of these nano oxalates wasexamined for the thermal decomposition of ammonium perchlorate (AP) and composite solidpropellants (CSPs) using thermogravimetry (TG), TG coupled with differential scanning calorimetry (TG–DSC) and ignition delay measurements. All the nano oxalates showed very high activity as burning ratecatalysts for composite solid propellants (CSPs) containing hydroxyl terminated polybutadiene (HTPB)as binder and AP as oxidizer. CoC2O4 2H2O was found to be the best catalyst in terms of loweringdecomposition temperature of both AP and CSPs
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Somatic Embryogenesis in Withania somnifera (L.) Dunal
Rani, Gita,Virk, Gurdip Singh,Nagpal, Avinash The Korean Society of Plant Biotechnology 2004 Plant molecular biology and biotechnology research Vol.6 No.2
Somatic embryos were formed from calli obtained from axillary shoots (raised from nodal segments of glasshouse-grown plants under aseptic conditions), internodal segments (from in vitro-raised plants), and root and coty-ledonary leaf segments (from in vitro-raised seedlings) after 8 weeks of initial culture. Embryo formation was the highest (97.33%) from cotyledonary leaf callus on Mura-shige and Skoog's (MS) medium containing kinetin (KN) (3 mg/L). Somatic embryo induction was lesser with different combinations of auxins while it increased to 100% in internodal segment and cotyledonary leaf calli with 6-benzyladenine (BA) (2mg/L) along with 2,3,5-triiodobenzoic acid (TIBA) (2mg/L). The shoots were induced from somatic embryos raised from root, coty-ledonary leaf and internodal segment calli grown on MS medium containing BA in combination with indole-3-acetic acid (IAA). Maximum of 66.67% cultures formed shoots on MS medium containing BA (1mg/L) in combination with IAA (2mg/L). The shoots raised from somatic embryos were rooted on MS medium supplemented with indole-3-butyric acid (IBA) (2mg/L). The plantlets transferred to the field showed 70% survival rate after one year.
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