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Characterization of winged bean (<i>Psophocarpus tetragonolobus</i>(L.) DC.) based on molecular, chemical and physiological parameters

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American Journal of Molecular Biology 2013年第4期3卷 187-197页

作者： Chandra Sekhar Mohanty Sushma Verma Vinayak Singh Shahina Khan priyanka gaur Priya Gupta M. Abdul Nizar Nilamani Dikshit Rojalin Pattanayak Alpika Shukla Abhishekh Niranjan Nayan Sahu Soumit Kumar Behera Tikam Singh Rana CSIR-National Botanical Research Institute Rana Pratap Marg Lucknow Uttar Pradesh India National Bureau of Plant Genetic Resources Regional Station Akola Maharashtra India Sanjay Gandhi Institute of Post-Graduate Medical Sciences Lucknow Uttar Pradesh India University of Lucknow Lucknow Uttar Pradesh India

Winged bean (Psophocarpus tetragonolobus (L.) DC.) is a potential legume crop of the tropics with high protein and oil content in the seeds. Analysis of the mutual genotypic relationships among twenty four genotypes of P. tetragonolobus through Mantel test found a significant correlation (r = 0.839) between similarity matrices of the results obtained from the use of the RAPD and ISSR molecular markers. The UPGMA tree based on Jaccard’s similarity coefficient generated from their cumulative data showed two distinct clusters and seven sub-clusters among these accessions. Quantification of total polyphenols, flavonoids and tannin revealed the highest percentage of occurrence of kaempferol (1.07-790.5 μg/g) and the lowest percentage of gallic acid (0.09-3.49 μg/g) in the seeds. Phytochemical analysis of the winged bean genotypes revealed that, some of the exotic lines are distinct. Analysis of photosynthesis rate, photosynthetic yield and stomatal conductance data also showed two clusters and was in congruence with the phytochemical affinities of the genotypes. The overall high level of polymorphism and varied range of genetic distances across the genotypes revealed a wide range of genetic base of P. tetragonolobus. The present investigation therefore, has provided significant insights for further improvement of winged bean germplasm for its qualitative and quantitative traits.

关键词： Psophocarpus tetragonolobus Polyphenols Flavonoid RAPD ISSR Physiological Parameter

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Development and Evaluation of Nano-Silica Dispersed Polyurethane Based Coatings for Improved Anti-Graffiti and Scratch Resistance

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Open Journal of Applied Sciences 2015年第12期5卷 808-818页

作者： priyanka Adapala Swati gaur Ravindra G. Puri Anand S. Khanna Department of Metallurgical Engineering & Materials Science IIT Bombay Mumbai India

Polyurethane based anti-graffiti coatings have been developed by incorporating varying amounts of OH-functional Silicone modified polyacrylate. Optimization of Silicone polyacrylate concentration in neat PU was done by testing its performance for graffiti resistance. Tests which include static contact angle measurements with water and spray paint, visual inspection of stain removal and color change measurements were performed. It was observed that 5 wt % of Silicone polyacrylate in the neat PU showed 95% stain removability. These coatings showed excellent graffiti resistance but poor mechanical properties. Hence modification of these coatings was done by nano-particle incorporation. Nano-silica particle concentration was optimized for surface mechanical properties such as surface hardness, elastic modulus and scratch resistance. FEG-TEM revealed that nano-silica particles were uniformly distributed over the surface. 5 wt % nano-silica particle additions in PU-5 wt % silicone polyacrylate base showed superior mechanical properties than other concentrations. Color change measurements showed that nano-silica particle addition had no effect on its graffiti resistance. Hence PU-5 wt % silicone polyacrylate, 5 wt % nano-silica showed excellent graffiti resistance and mechanical properties.

关键词： Silicone Modified Polyacrylate Nano-Silica Particles Anti-Graffiti Scratch Resistance

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