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- 저자 : Tyagi Pankaj Kumar (검색결과 2 건)
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Singh Divya,Ramniwas Seema,Tyagi Pankaj Kumar,Kumar Girish,Gola Deepak 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.1
Drosophila (Sophophora) kikkawai, Burla, 1954 and Drosophila (Sophophora) leontia, Tsacas & David 1978 are closely related sibling species, the former being cosmopolitan and the latter is restricted to tropical localities. We investigated the influence of introgressive hybridization on phenotypic diversity of the two sibling species in the present study. How hybridization supports the relative abundance of pure species according to latitudinal cline is the aim of this study because hybrids show a tendency to acquire geographical location of their parent species in equal or greater abundance. How hybridization supports the plasticity for melanization of hybrids is not explored yet. The two species can cross and generate hybrids. For this, we crossed true breeding strains of both species to obtain the hybrids i.e. dark female (♀) of D. kikkawai (D. k) with males (♂) of D. leontia (D. l) in cross I and light ♀ of D. k with ♂ of D. l in cross II along with their reciprocal crosses. Finally, we studied the plasticity of both species and their hybrids at 6 growth temperatures (14, 17, 21, 25, 28 and 31 ◦ C). We found that there is no plasticity for melanization in true breeding darker and lighter strain of D. kikkawai as well as D. leontia whereas hybrids of both species showed high phenotypic plasticity. Significant differences in slope values across tem peratures in parental and hybrid lines suggest plastic effects. Phenotypic variation in abdominal melanization in hybrids can be interpreted as a result of gene introgression with D. kikkawai. We conclude that introgressive hybridization might be an important, although underestimated, mechanism shaping species distribution and adaptation.
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Sonu Rani,Khushboo Kumari,Pankaj Kumar,Shiv Prakash,Kriti Tyagi,Sanjay R. Dhakate,Saroj Kumari 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
The remarkable properties exhibited by carbon fibers have generated considerable interest in seekingalternative approaches to replace time-consuming, energy-intensive, and multi-step procedures for theirsynthesis. Among the various stages involved in carbon fiber synthesis, the stabilization step plays a crucialrole as it necessitates an extended duration to transform thermoplastic pitch-fibers into thermosettingfibers, thus preventing them from melting during high-temperature treatments. In this study,isotropic coal tar pitch (ICTP) was transformed into pitch fibers through melt-spinning process and subsequentlysubjected to chemical treatment for stabilization using varying concentrations (ranging from5% to 50% v/v) of aqueous nitric acid (HNO3) solutions. The objective was to determine the optimal concentrationfor effective stabilization. Consequently, this research eliminates the conventional, timeconsumingair-stabilization process by treating the pitch fibers with nitric acid prior to carbonization. To produce carbon fibers, all chemically stabilized pitch fibers were directly carbonized at 1000 C. Comprehensive characterizations including Rheology, Elemental analysis, FTIR, TGA, FE-SEM, XRD,Raman, and XPS were conducted to investigate the chemical and structural transformations occurringduring the fiber processing. It was observed that aqueous nitric acid solutions ranging from 15% to30% (v/v) exhibited superior structural, morphological, and mechanical properties compared to otherconcentrations of HNO3.
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