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Yashpal S. Malik,Kuldeep Sharma,Nirupama Vaid,Somendu Chakravarti,K. M. Chandrashekar,Sanjay S. Basera,Rashmi Singh,Minakshi,Gaya Prasad,Baldev R. Gulati,Kiren N. Bhilegaonkar,Awadh B. Pandey 대한수의학회 2012 JOURNAL OF VETERINARY SCIENCE Vol.13 No.3
The present study describes the genotypic distribution of rotaviruses (RVs) in an Indian bovine population with unexpectedly higher proportions of G3 alone or in combination of G8/G10. PCR-genotyping confirmed that 39.4% (13/33) of the prevalent RVs were the G3 type while 60.6% (20/33) were dual G3G10 or G3G8 types. P typing revealed that 93.9% (31/33) of the samples were P[11] while 6.1% (2/33) possessed a dual P[1]P[11] type. Sequence analysis of the VP7 gene from G3 strains viz. B-46, 0970, and BR-133 showed that these strains had sequence identities of 90.5% to 100% with other bovine G3 strains. The highest identity (98.9% to 100%) was observed with RUBV3 bovine G3 strains from eastern India. The G3 strains (B-46, 0970, and BR-133) showed 97.5% to 98.8% sequence homologies with the Indian equine RV strain Erv-80. Phylogenetic analysis demonstrated that G3 strains clustered with bovine RUBV3 and J-63, and equine Erv-80 G3. Overall, these results confirmed that the incidence of infection by RVs with the G3 genotype and mixed genotypes in the bovine population was higher than previously predicted. This finding reinforces the importance of constantly monitoring circulating viral strains with the G3 genotype in future surveillance studies.
Limitations in doxorubicin production from Streptomyces peucetius
Malla, S.,Prasad Niraula, N.,Singh, B.,Liou, K.,Kyung Sohng, J. G. Fischer 2010 Microbiological research Vol.165 No.5
Doxorubicin (DXR), produced by Streptomyces peucetius ATCC 27952, exhibits potent antitumor activity against various cancer cell lines. Considerable time has lapsed since the biosynthesis of DXR and its overproduction was first summarized. Based on biosynthetic studies and product analysis, various factors affecting its production by the parental strain, S. peucetius ATCC 27952, are reviewed to better circumvent any bottlenecks in DXR production, thereby providing ideas to genetically engineered industrial strains of S. peucetius.
Structural studies of a green-emitting terbium doped calcium zinc phosphate phosphor
Ramesh, B.,Dillip, G.R.,Rambabu, B.,Joo, S.W.,Raju, B. Deva Prasad Elsevier 2018 Journal of molecular structure Vol.1155 No.-
<P><B>Abstract</B></P> <P>In this study, a new green emitting CaZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Tb<SUP>3+</SUP> phosphors were synthesized through solid-state reaction route. The phosphors were characterized structurally by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). All the synthesized phosphors were crystallized in triclinic crystal structure with <I>P</I> 1 ¯ space group. The phosphate groups in the phosphors were confirmed by FTIR analysis. The surface elements O <I>1</I>s, P <I>2</I>p, Ca <I>2</I>p, Zn <I>2</I>p and Tb 3<I>d</I> were studied by high-resolution XPS spectra. Upon excitation at 378 nm, the dominant green emission of CaZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Tb<SUP>3+</SUP> phosphors at 542 nm were noticed in the emission spectra. For various emission wavelengths (at 435 and 489 nm) and constant excitation wavelength (at 378 nm), the decay curves have shown two different decay dynamics of phosphors. The lighting properties such as Commission International de l’Eclairage (<I>x</I> = 0.319, <I>y</I> = 0.398) and color temperature (5995 K) were calculated.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A green emitting CaZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Tb<SUP>3+</SUP> phosphors were synthesized. </LI> <LI> Chemical bonds of PO, CaO, ZnO and TbO were investigated by XPS. </LI> <LI> The phosphor has two different decay dynamics upon various emissions. </LI> <LI> Chromaticity coordinates were located in green region of visible spectrum. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Dillip, G.R.,Kumar, Grandhe Bhaskar,Bandi, Vengala Rao,Hareesh, M.,Deva Prasad Raju, B.,Joo, S.W.,Bharat, L. Krishna,Yu, Jae Su ELSEVIER SCIENCE 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.699 No.-
<P><B>Abstract</B></P> <P>A single-phase white-light-emitting phosphor, K<SUB>3</SUB>ZnB<SUB>5</SUB>O<SUB>10</SUB>:Dy<SUP>3+</SUP>, has been synthesized by a conventional solid-state reaction method. X-ray diffraction (XRD) analysis was used to determine the monoclinic crystal structure of phosphors. The surface states, B 1s, O 1s, K 2p, Zn 2p, and Dy 3d of the phosphor was quantified by X-ray photoelectron spectroscopy (XPS). Diffuse reflectance spectroscopy (DRS) revealed double absorption edges at 3.27 and 5.46 eV for K<SUB>3</SUB>ZnB<SUB>5</SUB>O<SUB>10</SUB> matrix. The formation of defect-levels, zinc interstitials ( Z <SUB> n i </SUB> ) , zinc vacancies ( <SUB> V Z n </SUB> ) , oxygen antisites ( <SUB> O Z n </SUB> ) and oxygen vacancies ( <SUB> V O </SUB> ) in K<SUB>3</SUB>ZnB<SUB>5</SUB>O<SUB>10</SUB>:Dy<SUP>3+</SUP> phosphors were identified by photoluminescent (PL) spectroscopy. The emissions at 405 nm (violet-I), 434 nm (violet-II), and 467 nm (blue) are due to intra-band transitions of ( F X → <SUB> V Z n </SUB> ) , ( Z <SUB> n i </SUB> → <SUB> V Z n </SUB> ) and ( Z <SUB> n i </SUB> → <SUB> O Z n </SUB> ) of the host, respectively. Similarly, the emission at 517 nm (green) corresponds to the transition from free excitons to the oxygen vacancies in the host ( F X → <SUB> V O </SUB> ) . The emissions at 575 and 665 nm are assigned to the <I>f-f</I> transitions of Dy<SUP>3+</SUP> ions within the host matrix. An energy level diagram is proposed to describe the host emission and possible energy transfer from the host to dopant ions in the single-phase phosphor. The phosphor shows good thermal stability with activation energy of 0.52 eV. The combined emissions in the blue, green, yellow, and red regions resulted in white light emission with CIE coordinates of (0.256, 0.258) on the CIE diagram.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Versatile host-sensitized white light emission, K<SUB>3</SUB>ZnB<SUB>5</SUB>O<SUB>10</SUB>:Dy<SUP>3+</SUP> phosphor was synthesized. </LI> <LI> Defect-related surface analysis of phosphor was studied by XPS. </LI> <LI> Energy level diagram was designed to show host to dopant energy transfer process. </LI> <LI> The phosphor has shown good thermal stability with activation energy of 0.52 eV. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Prasad, D. Hari,Park, S. Y.,Ji, H.-I.,Kim, H.-R.,Son, J.-W.,Kim, B.-K.,Lee, H.-W.,Lee, J.-H. AmericanChemical Society 2012 The Journal of Physical Chemistry Part C Vol.116 No.5
<P>In this study, Ce<SUB>0.65</SUB>Zr<SUB>0.25</SUB>RE<SUB>0.1</SUB>O<SUB>2−δ</SUB> (RE = Tb, Gd, Eu, Sm, Nd, Pr,and La)solid solutions were successfully prepared by the glycine-nitrateprocess and tested for CO oxidation activity. The X-ray diffractionresults confirmed the formation of complete Ce<SUB>0.65</SUB>Zr<SUB>0.25</SUB>RE<SUB>0.1</SUB>O<SUB>2−δ</SUB> solid solutions.The Raman spectroscopy measurements suggested the presence of oxygenvacancies due to defective structure formation and further evidencedthe formation of solid solution. The high-resolution transmissionelectron microscopy observations showed the nanocrystalline natureof the solid solutions. From X-ray photoelectron spectroscopy analysisit was revealed that the cerium, terbium, and praseodymium are presentin +3 and +4 oxidation states. The UV–vis diffuse reflectancespectroscopy indicated that the Pr<SUP>3+</SUP> ions in the Ce<SUB>0.65</SUB>Zr<SUB>0.25</SUB>Pr<SUB>0.1</SUB>O<SUB>2−δ</SUB> system provoked a significant increase in the Ce<SUP>3+</SUP> fractionon the surface. H<SUB>2</SUB> temperature-programmed reduction measurementsshowed an enhanced surface reduction at much lower temperatures forCe<SUB>0.65</SUB>Zr<SUB>0.25</SUB>Pr<SUB>0.1</SUB>O<SUB>2−δ</SUB> sample compared to others, indicating increased oxygen mobilityin these samples, which enable the enhanced oxygen diffusion at lowertemperatures. Significantly high CO oxidation activity is exhibitedby Ce<SUB>0.65</SUB>Zr<SUB>0.25</SUB>Pr<SUB>0.1</SUB>O<SUB>2</SUB> solid solution.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2012/jpccck.2012.116.issue-5/jp207107j/production/images/medium/jp-2011-07107j_0007.gif'></P>
Phase dependent magnetic properties of Ni-Au alloy nanowires
Prasad, R.V.S.,Hyun An, B.,Shin, Y.,Tak Jeon, I.,Suh, J.Y.,Keun Kim, Y.,Choi, I.S. North-Holland 2014 Materials Letters Vol.116 No.-
Binary alloy nanowires of mutually immiscible Ni-Au system are synthesized by electrodeposition method. Here, we incorporate the concept of alloy design into nanowires to effectively engineer and control the magnetic properties of nanowires. Saturation magnetization and coercivity values of as-deposited Ni-Au alloy nanowires strongly correlate with either the phases present or to the dissolution of gold to nickel. The magnetic properties, however, were significantly affected upon annealing, which is correlated with the structural evolution of a weakly magnetic metastable hcp-Ni phase. We report here the detailed investigation on phase transformations in Ni-Au alloy nanowires and their effect on magnetic properties.
Ramesh, B.,Dillip, G.R.,Reddy, G. Rajasekhara,Raju, B. Deva Prasad,Joo, S.W.,Sushma, N. John,Rambabu, B. Elsevier 2018 Optik Vol.156 No.-
<P><B>Abstract</B></P> <P>A high-temperature solid state reaction route was employed to synthesize the phosphate based new orange-red emitting trivalent samarium (Sm<SUP>3+</SUP>) ions doped calcium zinc phosphate (CZP: CaZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>) phosphor. The crystalline phase formation was studied by X-ray diffraction analysis. The surface properties of the phosphor were investigated by X-ray photoelectron spectroscopy. Under the excitation of 402 nm, the emission spectra of CZP:Sm<SUP>3+</SUP> has several peaks and the dominant peak at 596 nm was ascribed to <SUP>4</SUP>G<SUB>5/2</SUB> → <SUP>6</SUP>H<SUB>7/2</SUB> transition. The concentration quenching effect of Sm<SUP>3+</SUP> in CZP phosphor was observed for 5 at%. The mechanism of energy transfer between similar Sm<SUP>3+</SUP> ions was determined to be quadrupole-quadrupole interaction. The decay curves of all phosphors were well fitted to the first-order exponential function. The chromaticity coordinates were located in the orange-red region of the chromaticity diagram. Therefore, these results suggest that the orange-red emitting new CZP:Sm<SUP>3+</SUP> phosphor to be used in the phosphor-converted white light emitting diodes.</P>