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Synthesis and Characterization of Polypyrrole (PPy) Thin Films

Soft nanoscience Letters 2011年第1期1卷 6-10页

作者： M. A. Chougule S. G. pawar P. R. Godse R. n. Mulik Shashwati Sen V. B. Patil Materials Research Laboratory School of Physical Sciences Solapur University

Polypyrrole (PPy) was synthesized by chemical oxidative polymerization technique using monomer pyrrole and ammo-nium persulphate as an oxidant in a ratio of 1:1. Thin films of polypyrrole were prepared by dissolving polypyrrole in mcresol and cast using spin coating technique on glass substrates. Thin films of polypyrrole were characterized by X ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform infra red spectroscopy (FTIR), UV visible spectroscopy and electrical resistivity by four probe method. The XRD spectra showed that the polypyrrole is amorphous in nature. SEM studies revealed a uniform granular structure of PPy. The FTIR spectra shows that the presence of all characteristics absorption peaks of polypyrrole that is, 890 cm?1 (=C–H out-of-plane vibration), 1040 cm?1 (=C–H in-plane vibration), 1170 cm?1 (n–C stretch bending) and 1410 cm?1 (pyrrole ring vibration). UV visible study shows PPy films exhibit absorption peak at 446 nm (2.77 eV). Room temperature electrical resistivity of PPy is in the critical regime of the metal –to –insulator (M-I) transition.

关键词： Polypyrrole Chemical Polymerization XRD SEM FTIR

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Cytogenetic Profile in 7209 Indian Patients with de novo Acute Leukemia: A Single Centre Study from India

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Journal of Cancer Therapy 2016年第7期7卷 530-544页

作者： P. S. Kadam Amare H. Jain S. Kabre Y. Deshpande P. pawar S. Banavali H. Menon M. Sengar B. Arora n. Khattry G. narula D. Sarang S. Kaskar B. Bagal H. Jain Uma Dangi P. G. Subramanian S. Gujral Cancer Cytogenetics Department Tata Memorial Hospital Mumbai India Department of Medical Oncology Tata Memorial Hospital Mumbai India Hematopathology Laboratory Department of Pathology Tata Memorial Hospital Mumbai India

Background: Cytogenetics is one of the most important diagnostic parameters in the classification of acute leukemia. Recurrent chromosomal aberrations in acute leukemia have provided insights into the molecular mechanism of leukemogenesis. The variable frequencies of recurrent cytogenetic markers due to ethical/racial differences have been reported from Western and some Asian countries. Objective: We report cytogenetic data of largest cohort of 7209 adult and pediatric patients with de novo acute leukemia (AL) to determine the prevalence of various cytogenetic sub groups and compare with the Western and Asian population. Material & Methods: The AL patients included 2609 AML (adult: 2042, pediatric: 567), 3708 B-cell-precursor (BCP)-ALL (adult: 1300, pediatric: 2408) and 892 cases of T-ALL (adult: 480, pediatric: 412). Cytogenetic studies included conventional karyotyping and FISH using panel of probes. Results: The incidence of t(8;21) was high, comparable to other Asian countries. In comparison to our series and Western population, t(15;17) was more prevalent in Chinese population. Cytogenetic profiling of BCP-ALL revealed low prevalence of ETV6/RUnX1 in ours as well as other Asian population. The MLL aberrations in BCP-ALL and TLX1 & TLX3 aberrations in T-ALL occurred less frequently in our series as compared with Western population. Conclusion: The present study with a large cohort showed the heterogeneity of AL that involved various factors, such as age, gender and prevalence of distinct cytogenetic subgroups. Our data in comparison with other population based studies revealed differential distribution of some cytogenetic sub-groups indicating geographic heterogeneity due to differential environmental exposure which probably influenced underlying genetic susceptibility.

关键词： Cytogenetics Acute Leukemia Incidence Asian Population Geographic Heterogeneity

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Growth, photosynthesis and nitrogen metabolism in soybean varieties after exclusion of the UV-B and UV-A/B components of solar radiation

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The Crop Journal 2014年第6期2卷 388-397页

作者： Sanjay Singh Baroniya Sunita Kataria Govind Prakash Pandey Kadur n. Guruprasad Government Shri Krishnaji Rao pawar Post Graduate College Photobiology Laboratory School of Life Sciences Khandwa Road Campus Devi Ahilya University

A field experiment was conducted to study the impact of the exclusion of the solar UV components on growth, photosynthesis and nitrogen metabolism in soybean(Glycine max)varieties PK-472, Pusa-24, JS 71-05, JS-335, nRC-7 and Kalitur. The plants were grown in specially designed UV exclusion chambers wrapped with filters to exclude UV-B or UV-A/B and transmitted all UV. Exclusion of UV significantly enhanced the growth of the aerial parts as well as the growth of the below ground parts in all of the six soybean *** reductase activity(nRA) was significantly reduced, whereas leghemoglobin(Lb)content, total soluble protein, net photosynthesis(Pn) and α-tocopherol content were enhanced after UV exclusion. The exclusion of solar UV-A/B enhanced all parameters to a larger extent than the exclusion of solar UV-B in four of the six varieties of soybean except for nRC-7 and Kalitur. These two varieties responded more to UV-B exclusion compared to UV-A/B exclusion. A significant inverse correlation between the nRA and the number of nodules per plant was observed. The extent of response in all parameters was greater in PK-472 and JS71-05 than that in Kalitur and JS-335 after UV exclusion. The exclusion of UV augmented the growth of nodules, Lb content and α-tocopherol levels and conferred higher rates of Pnto support better growth of nodules. Control plants(+ UV-A/B) seemed to fulfill their n demand through the assimilation of nO-3resulting in lower symbiotic nitrogen fixation and higher nR activity.

关键词： α-Tocopherol nitrate reductase nodules Photosynthesis UV exclusion

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