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Charge carrier dynamics in PffBT4T-2OD: PCBM organic solar cells
Sharma, Ramakant,Gupta, Vinay,Lee, Hyunwoo,Borse, Kunal,Datt, Ram,Sharma, Chhavi,Kumar, Mahesh,Yoo, Seunghyup,Gupta, Dipti Elsevier 2018 ORGANIC ELECTRONICS Vol.62 No.-
<P><B>Abstract</B></P> <P>We investigate the charge carrier dynamics of inverted organic solar cells (OSCs) based on PffBT4T-2OD: PCBM and PTB7: PCBM – the two leading systems among the OSCs based on polymer-fullerene bulk-heterojunction – to elucidate the origin of their performance difference. Transient absorption spectroscopy (TAS) and photo-electrochemical impedance spectroscopy (photo-EIS) were employed to unravel the photo-physics that govern the cell operation of these two highly efficient bulk heterojunction OSCs. While photo-EIS indicates that the two systems under study exhibit similar behavior in terms of recombination, TAS results reveal that PffBT4T-2OD: PCBM systems not only have higher charge generation rate but also more efficient charge transfer than PTB7: PCBM systems, leading to the power conversion efficiency of PffBT4T-2OD: PCBM-based OSCs (9.16%) that is higher than that of PTB7: PCBM-based OSCs (6.44%).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Charge carrier dynamics of PffBT4T-2OD: PCBM and PTB7: PCBM OSCs have been compared. </LI> <LI> TAS and Photo-EIS measurements along with optical simulation were carried out. </LI> <LI> Higher PCE for PffBT4T-2OD: PCBM OSCs is due to better absorption and carrier collection efficiency. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Kumar Pranaw ),( Surender Singh ),( Debjani Dutta ),( Nirpendra Singh ),( Garima Sharma ),( Sudershan Ganguly ),( Vinay Kalia ),( Lata Nain ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.11
Proteases produced by Xenorhabdus are known to play a significant role in virulence leading to insect mortality. The present study was undertaken to purify and characterize protease from Xenorhabdus indica, an endosymbiont of nematode Steinernema thermophilum, and to decipher its role in insect mortality and its efficacy to control Helicoverpa armigera. A set of 10 strains of Xenorhabdus isolated from different regions of India were screened for protease activity on the basis of zone of clearing on gelatin agar plates. One potent strain of Xenorhabdus indica was selected for the production of protease, and the highest production (1,552 U/ml) was observed at 15-18 h of incubation at 28oC in soya casein digest broth. The extracellular protease was purified from culture supernatant using ammonium sulfate precipitation and ion-exchange chromatography. The enzyme was further characterized by SDS-PAGE and zymography, which confirmed the purity of the protein and its molecular mass was found to be ~52 kDa. Further MALDI-TOF/TOF analysis and effect of metal chelating agent 1,10-phenanthrolin study revealed the nature of the purified protease as a secreted alkaline metalloprotease. The bioefficacy of the purified protease was also tested against cotton bollworm (Helicoverpa armigera) and resulted in 67.9 ± 0.64% mortality within one week. This purified protease has the potential to be developed as a natural insecticidal agent against a broad range of agriculturally important insects.
M. Manhas,Vinay Kumar,Vivek K. Singh,J. Sharma,Ram Prakash,Vishal Sharma,A.K. Bedyal,H.C. Swart 한국물리학회 2017 Current Applied Physics Vol.17 No.11
The present paper reports on the structural and luminescent properties of un-doped and Sm3þ doped Ba2Ca(BO3)2 phosphors synthesized by the conventional solid state method. For structural characterizations, the X-ray diffraction, FTIR spectroscopy and Rietveld refinement method were used. The FTIR spectrum was composed of basic BO3 and BO4 structural units of borates. The Sm3þ doped phosphors under 402 nm (6H5/2/4L13/2) excitation, showed an orange red emission corresponding to the 601 nm (4G5/2 / 6H7/2) transition of the Sm3þ ion. An increase in the PL emission intensity was observed up to 2 mol % with the increase in Sm3þ ions concentration. The critical distance between the Sm3þ e Sm3þ ions were found to be 24.36 Å. Moreover, the phosphors decaytime and optical bandgap at different concentration of Sm3þ ion also have been discussed in details. All the results show that Ba2Ca(BO3)2:Sm3þ phosphor may be used with a near ultraviolet (n-UV) chip to fill the amber gap in light emitting diodes (LEDs).
Eeda Venkateswara Rao,Vinay Kumar Sharma,Niti Sharma,Young-Soo Kim,Sang-Hun Jung 충남대학교 약학대학 의약품개발연구소 2014 藥學論文集 Vol.29 No.-
To define the role of substituents of chalcones as potent MD-2 inhibitors, we designed and synthesized analogs of 1-(2-hydroxy-6-(isopentyloxy)phenyl)-3-(4-hydroxyphenyl)prop-2-en-1-one (1) for their in vitro activities against RAW 264.7 cell using the SEAP assay as well as for LPS displacement assay. Among all the derivatives, compound 5 (IC50=27.3 μM), showed good inhibition of NF-κB activation by blocking the TLR4-mediated NF-κB activation signalling in RAW 264.7 as well as the rhMD-2 binding to immobilized LPS with 53% inhibition at 30 μM. The SAR studies indicated that small alkyl group like 3-methylbutoxy at 6-position of ring A and substituent with hydrogen bonding capability at 4-position of ring B of chalcone should be very important for inhibition of LPS induced NF-κB activation and LPS displacement of MD-2.
Isolation and Characterization of Lipopolysaccharides from Different Rhizobial Isolates
Mahipal Singh Kesawat,Basanta Kumar Das,GR Bhaganagare,Vinay Sharma,Manorama 한국작물학회 2009 Journal of crop science and biotechnology Vol.12 No.3
Formation of nodules on roots or in stems (in some cases) of leguminous plants is the unique ability of gram-negative bacteria, Rhizobia, which converts atmospheric nitrogen into usable forms by the host plant. Lipopolysaccharide (LPS) is the outer membrane component of the gram-negative bacteria, known to be an essential factor in host recognition, specificity, and initial infection processes. In the present study, we extracted lipopolysaccharides from different rhizobial isolates by a modified phenol-water method and partially characterized by polyacrylamide gel electrophoresis with silver staining. The results showed two separate banding regions, LPS-I and LPS-II. The high molecular weight and electrophoretic mobility of LPS-I region resembles that of lysozyme, used as a standard marker. The LPS-II region has a low molecular weight and electrophoretic mobility greater than that of lysozyme. The LPS-II region was due to incomplete LPS, which either lacks the entire O-antigen repeating unit or contains only one or two repeating units. The banding patterns of LPS vary among the different rhizobial isolates. Results revealed that the type of LPS structure and banding regions greatly facilitate the further characterization of the LPS modifications required for symbiosis. Formation of nodules on roots or in stems (in some cases) of leguminous plants is the unique ability of gram-negative bacteria, Rhizobia, which converts atmospheric nitrogen into usable forms by the host plant. Lipopolysaccharide (LPS) is the outer membrane component of the gram-negative bacteria, known to be an essential factor in host recognition, specificity, and initial infection processes. In the present study, we extracted lipopolysaccharides from different rhizobial isolates by a modified phenol-water method and partially characterized by polyacrylamide gel electrophoresis with silver staining. The results showed two separate banding regions, LPS-I and LPS-II. The high molecular weight and electrophoretic mobility of LPS-I region resembles that of lysozyme, used as a standard marker. The LPS-II region has a low molecular weight and electrophoretic mobility greater than that of lysozyme. The LPS-II region was due to incomplete LPS, which either lacks the entire O-antigen repeating unit or contains only one or two repeating units. The banding patterns of LPS vary among the different rhizobial isolates. Results revealed that the type of LPS structure and banding regions greatly facilitate the further characterization of the LPS modifications required for symbiosis.
Lee, Jee-Hyun,Thanigaimalai, Pillaiyar,Lee, Ki-Cheul,Bang, Seong-Cheol,Kim, Min-Seok,Sharma, Vinay Kumar,Yun, Cheong-Yong,Roh, Eunmiri,Kim, Youngsoo,Jung, Sang-Hun The Pharmaceutical Society of Japan 2010 Chemical & pharmaceutical bulletin Vol.58 No.7
<P>In order to determine the optimum size of heterocycle of lead compound 1 (6-methyl-3-phenethyl-3,4-dihydro-1<I>H</I>-quinoline-2-thione; IC<SUB>50</SUB>=0.8 μ<SMALL>M</SMALL>) for inhibition of melanogenesis, we have synthesized and evaluated some benzimdazole-2(3<I>H</I>)-thiones 5a—e. The preliminary bioassay has shown that the benzimdazole-2(3<I>H</I>)-thione motif of 5 is essential structural unit for their inhibitory activity. Among all thiones 5a—e, the compound 5d strongly inhibited the formation of melanin with IC<SUB>50</SUB> value of 1.3 μ<SMALL>M</SMALL>.</P>