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Blend of Polyhydroxyalkanoates Synthesized By Lipase Positive Bacteria From Plant Oils

Journal of Renewable Materials 2019年第5期7卷 463-476页

作者： Nasir Javaid rida batool Nazia Jamil Department of Microbiology and Molecular Genetics University of the PunjabQuaid-e-Azam CampusLahore-54590Pakistan

A total of 5 biochemically characterized lipase positive bacterial strains were screened for Polyhydroxyalkanoates(PHA)production by Nile blue staining and confirmation was done by Sudan Black *** production ability for all strains was optimized followed by time profiling calculation and comparison via using glucose and two plant oils i.e.,canola and mustard *** analysis showed that glucose can serve as a carbon source for maximum biomass(2.5 g/L CDW for strain 5)and PHA production(70.3%for strain 2).PHA produced by strain 2 was further analyzed for its chemical composition and type via Fourier Transform Infrared(FT-IR)*** revealed homopolymer(PHB)and copolymer(PHB-co-PHV)production of PHA(peaks at 1743 cm-1 and 2861 cm-1,respectively)with both canola and mustard oil unlike glucose which produced only homopolymer one i.e.,PHB(peaks at 1110 cm-1,1411 cm-1 and 1650 cm-1).Crystallinity of FT-IR analyzed PHA was calculated using mathematical formulas which showed decrease from glucose to canola to mustard *** study revealed that plant oils can serve as better carbon source to produce better quality(ductile and copolymer)***,16S rRNA gene sequencing analysis showed that strain 1,strain 2,strain 3,strain 4 and strain 5 are Stenotrophomonas sp.N3,Exiguobacterium sp.N4,Exiguobacterium ***3,Cellulosimicrobium sp.A8 and Klebsiella ***2,respectively.

关键词： Bioplastics polyhydroxyalkanoates lipase positive bacteria plant oils,FT-IR

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An Empirical Analysis of Learning and Teaching English as a Second Language： The Chinese Perspective

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Sino-US English Teaching 2014年第8期11卷 567-575页

作者： Naqvi Naj am Abbas rida batool Institute of Space Technology Islamabad PakistanNorthwestern Polytechnical University Xi'an China Northwestern Polytechnical University Xi'an China

This research venture investigates the trends and motives behind the English learning as a second language. The author has used the Chinese binoculars to probe into the phenomenon of English learning and teaching. English language has become an international tool of communication and business. Professional and students at China's Mainland have been learning English since long but this trend has been increased in the recent years due to the wave of globalization and also owing to the enormous emerging economy of China. Internationalization of education and the quest of knowing the culture and civilizations have spurred the need for English learning. The authors have performed a questionnaire based research with the sample of 130 university students learning Chinese at different English learning institutes at Xi＇an, Shanxi, China. The analysis of the findings in this research highlights the reasons behind the growing trends of English learning and also describes the teaching methodology for effective language teaching in the Chinese perspective.

关键词： English as second language (ESL) teaching language teaching methodology China

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