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Polygalacturonase (PG) Gene Expression in Musa acuminata Cultivars from Kerala
Thulasy Gayathri,Ashalatha Sunkarankutty Nair,Vidhu Aniruddha Sane 한국식품과학회 2013 Food Science and Biotechnology Vol.22 No.6
Banana cannot be preserved for a long timeafter harvesting due to a short shelf life. Fruit softening isassociated with textural changes due to disassembly of theprimary cell wall and modification of the structure andcomposition of various polysaccharides. Cell wall degradationis caused by the action of various cell wall hydrolaseenzymes. Polygalacturonase (PG) is the key enzymeinvolved in this process. The ripening period is different incultivars maintained under domesticated cultivation inKerala. PG activity was profiled in eight Musa acuminatacultivars from Kerala and expression analysis of the PGgene was accomplished using semi-quantitative RT-PCR. Maximum PG activity was observed in Palayankodan andminimum activity was observed in Kadali. Gene expressionanalysis showed variation between ethylene treated fruitsand controls in Palayankodan, whereas the expressionpatterns in Kadali were similar. The fruit softening processis cultivar specific.
Thulasi-Varma, Chebrolu Venkata,Gopi, Chandu V. V. M.,Rao, S. Srinivasa,Punnoose, Dinah,Kim, Soo-Kyoung,Kim, Hee-Je American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.21
<P>A novel strategy has been successfully developed for highly efficient nanosheet-structured NiS counter electrodes. The NiS was deposited on FTO substrate with different deposition times using the simple and cost-effective chemical bath deposition technique. The NiS CEs were used to grow high quality thin films containing nanoparticles, nanosheets, or nanorods. The nanosheet-structured NiS CE in QDSSCs under one-sun illumination (AM 1.5, 100 Mw cm<SUP>–2</SUP>) yielded a high short circuit current density (<I>J</I><SUB>sc</SUB>) of 13.53 mA cm<SUP>–2</SUP>, open circuit voltage (<I>V</I><SUB>oc</SUB>) of 0.570 V, fill factor (FF) of 0.450, and power conversion efficiency (η) of 3.47%. These values are much higher than those of the Pt CE (<I>J</I><SUB>sc</SUB> = 7.85 mA cm<SUP>–2</SUP>, <I>V</I><SUB>oc</SUB> = 0.611, FF = 0.243, and η = 1.170%). The NiS was strongly adhered on the FTO substrate by acetic acid which acts as stabilizer and strong reagent in this one step preparation. The performance of NiS CE was improved by the surface morphology, which enable rapid electron transport and a lower electron recombination rate for the polysulfide electrolyte redox couple. In the present study NiS has obtained higher electrocatalytic activity which plays a crucial role in the QDSSC. Electrochemical impedance spectroscopy and Tafel-polarization measurements were used to investigate the electrocatalytic activity of the NiS and Pt CEs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2015/jpccck.2015.119.issue-21/acs.jpcc.5b01771/production/images/medium/jp-2015-01771s_0001.gif'></P>
Thulasi-Varma, Chebrolu Venkata,Rao, S. Srinivasa,Ikkurthi, Kanaka Durga,Kim, Soo-Kyoung,Kang, Tae-Su,Kim, Hee-Je The Royal Society of Chemistry 2015 Journal of Materials Chemistry C Vol.3 No.39
<▼1><P>This study describes the synthesis of monodispersed PbS nanocrystals by a facile chemical bath deposition and cost-effective approach.</P></▼1><▼2><P>This study describes the synthesis of monodispersed PbS nanocrystals by a facile chemical bath deposition and cost-effective approach. PbS counter electrodes (CEs) were used to grow high-quality thin films containing cube-shaped nanocrystals or nanodendrites. The size and shape of the PbS nanocrystals can be easily controlled by varying the deposition time. Quantum dot-sensitized solar cells (QDSSCs) were made and showed improved performance using the PbS CEs obtained with a deposition time of 2 h. The nanocrystal structured PbS CE in QDSSCs under one-sun illumination (AM 1.5, 100 mW cm<SUP>−2</SUP>) yielded a high short circuit current density (<I>J</I>sc) of 11.20 mA cm<SUP>−2</SUP>, an open circuit voltage (<I>V</I>oc) of 0.560 V, a fill factor (FF) of 0.55, and a power conversion efficiency (<I>η</I>) of 3.48%. These values are much higher than those of the Pt CE (<I>J</I>sc = 79.29 mA cm<SUP>−2</SUP>, <I>V</I>oc = 0.604, FF = 0.28, and <I>η</I> = 1.58%). The concentration of acetic acid plays an important role in deciding the size and shape of the PbS nanocrystals in the nucleation and growth process. The PbS strongly adhered to the FTO substrate due to the acetic acid, which acts as a stabilizer and a strong reagent in this one-step preparation. The performance of the PbS CE was improved by the surface morphology, which enables rapid electron transport and a lower electron recombination rate for the polysulfide electrolyte redox couple. Electrochemical impedance spectroscopy and Tafel-polarization measurements were used to investigate the electrocatalytic activity of the PbS and Pt CEs.</P></▼2>
Chebrolu Venkata Thulasi-Varma,Balamuralitharan Balakrishnan,Hee-JeKim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Here, we report a simple strategy to grow NiSe architectures vertically on nickel foam (NF) via facilesolution-based deposition. The as-synthesized NSE7h core-shell nanoplate structure with a mass loadingof 6.4 mg/cm 2 can be delivered a high specific capacitance of 2234.84 Fg 1 at 10 mA cm 2 andoutstanding rate capability compared to that of NO (708.52 Fg 1), NS (968.22 Fg 1), NSE1h (1357.43 Fg 1),and NSE4h (1675.87 Fg 1). The desirable electrochemical performance was mainly attributed to thecomponent’s synergy assuring rich redox reactions, deposition of selenium on the surface of NiOnanotubes, high conductivity, great specific area and furthermore, rapid ion diffusion distance, witheffective transport pathway of electrons and electrolyte ions. The existence of selenium vacancies andversatile synthesis of NiSe architectures would open up a wide range of applications in energy storageand conversion applications including supercapacitors, electrocatalysis, and batteries.
HURWITZ TYPE RESULTS FOR CERTAIN REPRESENTATIONS OF INTEGERS AS SUMS OF SQUARES
D. D. Somashekara,THULASI.M.B. 장전수학회 2022 Proceedings of the Jangjeon mathematical society Vol.25 No.3
Let rα,β(n) denote the number of representations of n as a sum of α times a square and β times another square. In the recent past, a number of authors have obtained Hurwitz type results for representations of integers as sums of squares. Motivated by their works, in this paper we prove many results in which the generating function of r2,3(λk(an + b)), r2,4(an + b) and r1,5(λk(an + b)) for various non-negative integer values of λ, k, a and b are infinite products. To obtain our main results we use the theta function identities of Ramanujan found in chapter 16 of his second notebook.
( Matam Chandrasekharaiah ),( Appoothy Thulasi ),( M Bagath ),( Duvvuri Prasanna Kumar ),( Sunil Singh Santosh ),( Chenniappan Palanivel ),( Vazhakkala Lyju Jose ),( K. T. Sampath ) 생화학분자생물학회(구 한국생화학분자생물학회) 2011 BMB Reports Vol.44 No.1
Termites play an important role in the degradation of dead plant materials and have acquired endogenous and symbiotic cellulose digestion capabilities. The feruloyl esterase enzyme (FAE) gene amplified from the metagenomic DNA of Coptotermes formosanus gut was cloned in the TA cloning vector and subcloned into a pET32a expression vector. The Ft3-7 gene has 84% sequence identity with Clostridium saccharolyticum and shows amino acid sequence identity with predicted xylanase/chitin deacetylase and endo-1,4-beta-xylanase. The sequence analysis reveals that probably Ft3-7 could be a new gene and that its molecular mass was 18.5 kDa. The activity of the recombinant enzyme (Ft3-7) produced in Escherichia coli (E.coli) was 21.4 U with substrate ethyl ferulate and its specific activity was 24.6 U/mg protein. The optimum pH and temperature for enzyme activity were 7.0 and 37oC, respectively. The substrate utilization preferences and sequence similarity of the Ft3-7 place it in the type-D sub-class of FAE. [BMB reports 2011; 44(1): 52-57]
Kim, Hee-Je,Chebrolu, Venkata Thulasi-Varma The Royal Society of Chemistry 2018 NEW JOURNAL OF CHEMISTRY Vol.42 No.23
<P>Hierarchical nanostructures have recently attracted massive attention due to their remarkable performances in energy conversion, storage systems, catalysis, and electronic devices. Considering the advantage of hierarchical nanostructures, we have formulated a facile and cost-effective chemical bath deposition method to synthesize novel NiCo2S4 on a conductive substrate for quantum dot sensitized solar cells & methanol electro-oxidation. Owing to the unique nanoarchitecture, the NiCo2S4 electrodes were used to grow high quality thin films containing nanoflowers, nanoplatelets, or nanosheets. The nanoplate-structured NiCo2S4 CE in QDSSCs under one-sun illumination (AM 1.5, 100 mW cm<SUP>−2</SUP>) yielded a high short circuit current density (<I>J</I>sc) of 11.91 mA cm<SUP>−2</SUP>, open circuit voltage (<I>V</I>oc) of 0.602 V, fill factor (FF) of 0.50, and power conversion efficiency (<I>η</I>) of 3.53%. These values are much higher than those of the Pt CE (<I>J</I>sc = 6.98 mA cm<SUP>−2</SUP>, <I>V</I>oc = 0.579, FF = 0.36, and <I>η</I> = 1.10%). The electrocatalytic performance was investigated by cyclic voltammetry and chronoamperometry for NiCo2S4 electrodes <I>via</I> methanol electro-oxidation. Electrochemical studies reveal that the as-prepared NiCo2S4-NCS6h electrode displayed a significant enhancement in the electrocatalytic activity and stability for methanol oxidation in the presence of 2 M KOH with 0.5 M methanol. The results indicate that the hierarchical structure of NiCo2S4 offers a promising electrode material for QDSSCs and methanol electro-oxidation.</P>
Venkata-Haritha, M.,V.V.M. Gopi, C.,Thulasi-Varma, C.V.,Kim, S.K.,Kim, H.J. Elsevier Sequoia 2016 Journal of photochemistry and photobiology Chemist Vol.315 No.-
<P>Quantum dot sensitized solar cells (QDSSCs) have attracted considerable attention recently and become promising candidates for realizing a cost-effective and facile fabrication of solar cell with improved photovoltaic performance. QDs were directly grown on the TiO2 mesostructure by the successive ionic layer absorption and reaction (SILAR) technique. QDSSC based on CdS-CdSe photoanode achieves a power conversion efficiency of 3.42% under AM 1.5 G one sun illumination. The loading of Mn+2 metal ions was applied to a CdSe (CdS-Mn-CdSe) photoanode to enhance the absorption in QDSSCs, which greatly improved the power conversion efficiency. Without the passivation layer, the solar cell based on a CdS-Mn-CdSe QD-sensitized TiO2 photoelectrode shows higher J(sc) (14.67 mA/cm(2)), V-oc (0.590 V) and power conversion efficiency (4.42%) comparing to Mn-undoped CdS-CdSe QD sensitized TiO2 (J(sc): 11.29 mA/cm(2), V-oc: 0.568 V, and efficiency: 3.42%), which can be ascribed to superior light absorption, faster electron transport and slower charge recombination for the former. The effective electron lifetime of the device with CdS-Mn-CdSe was higher than those with CdS-CdSe, leading to more efficient electron-hole separation and slower electron recombination. The effects of Mn+2 metal ions on the chemical, physical, and photovoltaic properties of the QDSSCs have been investigated have been investigated by X-ray photon spectroscopy (XPS), UV-vis spectra, photocurrent-voltage (J-V) characteristics and electrochemical impedance spectra (EIS). (C) 2015 Elsevier B.V.All rights reserved.</P>
S., Srinivasa Rao,Punnoose, Dinah,Bae, Jin-Ho,Durga, Ikkurthi Kanaka,Thulasi-Varma, Chebrolu Venkata,Naresh, Bandari,Subramanian, Archana,Raman, Vivekanandan,Kim, Hee-Je Elsevier 2017 ELECTROCHIMICA ACTA Vol.254 No.-
<P><B>Abstract</B></P> <P>This paper reports the facile synthesis of a novel architectural of NiS/PEDOT:PSS with DEG, where the complementary features of the three components (well-defined NiS black pepper like nanoparticles on nickel foam, an ultrathin layers of poly (3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS), and diethylene glycol (DEG)) are deposited sequentially to a single entity to fabricate a high-performance electrode for supercapacitor applications. Owing to the high electrical conductivity of the well-defined NiS nanoparticles, in which the conductivity, and good chemical and electrochemical stability is enhanced further by the PEDOT:PSS and DEG thin layers, the as-fabricated NiS/PEDOT:PSS with a DEG chrysanthemum petal-like nanostructure exhibits good rate capability, excellent cycling stability, and high specific capacitance. The PEDOT:PSS with DEG offers extra conductive paths for each layer on NiS, yielding a lower internal resistance and charge-transfer resistance than that of the NiS/PEDOT:PSS without DEG. As a result, the NiS/PEDOT:PSS with the DEG electrode shows a tremendous pseudocapacitance of 750.64Fg<SUP>−1</SUP> at 1.11Ag<SUP>−1</SUP>, along with a high energy density of 24.52Whkg<SUP>−1</SUP> at a power density of 138.88Wkg<SUP>−1</SUP> and good cycling stability, suggesting that it is a promising candidate for energy storage. The unique performance of NiS/PEDOT:PSS with a DEG benefits from its unique chrysanthemum petal-like nanostructure, which could offer faster ion and electron transfer ability, greater reaction surface area and good structural stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NiS/PEDOT:PSS with DEG chrysanthemum petals were prepared using a facile bar-coating method. </LI> <LI> NiS/PEDOT:PSS with DEG showed greater electrochemical properties. </LI> <LI> Improved penetration of electrolyte ions into the electrode was observed by the attachment PEDOT:PSS on NiS. </LI> <LI> The electrode exhibited a high specific capacitance of 750.64Fg<SUP>−1</SUP> at 1.11Ag<SUP>−1</SUP>. </LI> <LI> The nanocomposite displayed excellent cycling stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>