http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Ram K. Gupta (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
( Gupta Anil Kumar ),( Rajiv Pathak ),( Bharat Singh ),( Hemlata Gautam ),( Ram Kumar ),( Raj Kumar ),( Rajesh Arora ),( Hemant K. Gautam ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.6
A Gram-positive bacterium was isolated from the saline soils of Jangpura (U.P.), India, and showed high-level of radiation-resistant property and survived upto 12.5 kGy dose of gamma radiation. The 16S rDNA sequence of this strain was examined, identified as Bacillus sp. strain HKG 112, and was submitted to the NCBI GenBank (Accession No. GQ925432). The mechanism of radiation resistance and gene level expression were examined by proteomic analysis of whole-cell extract. Two proteins, 38 kDa and 86.5 kDa excised from SDS-PAGE, which showed more significant changes after radiation exposure, were identified by MALDI-TOF as being flagellin and S-layer protein, respectively. Twenty selected 2-DE protein spots from the crude extracts of Bacillus sp. HKG 112, excised from 2- DE, were identified by liquid chromatography mass spectrometry (LC-MS) out of which 16 spots showed significant changes after radiation exposure and might be responsible for the radiation resistance property. Our results suggest that the different responses of some genes under radiation for the expression of radiation-dependent proteins could contribute to a physiological advantage and would be a significant initial step towards a fullsystem understanding of the radiation stress protection mechanisms of bacteria in different environments.
-
Polarized Raman scattering and lattice eigenmodes of antiferromagnetic NdFeO<sub>3</sub>
Singh, Manoj K.,Jang, Hyun M.,Gupta, H. C.,Katiyar, Ram S. John Wiley Sons, Ltd. 2008 JOURNAL OF RAMAN SPECTROSCOPY - Vol.39 No.7
<P>The first- and second-order Raman-active phonons in the orthorhombic Pbnm NdFeO<SUB>3</SUB> single crystals were studied by means of polarized Raman scattering and lattice dynamics computations (LDC). The zone-center phonons of A<SUB>g</SUB> symmetry were distinguished from the B<SUB>1g</SUB> eigenmodes by performing polarized Raman scattering experiments using two parallel polarization configurations, X′(ZZ)X′ and Z(X′X′)Z. With the help of LDC, we were able to assign most of the observed Raman-active modes, including phonons of B<SUB>2g</SUB> and B<SUB>3g</SUB> symmetry. The LDC results indicated that among the 16 force constants employed, the one corresponding to the stretching vibration between the central Fe cation and the axial oxygen atom in a FeO<SUB>6</SUB> octahedron unit had the largest value. This suggests that the B-site Fe cation is more tightly bound to the axial O1 ion than the other two equatorial O2 ions. It was further shown that at higher wavenumbers, the displacement of oxygen atoms contributed dominantly to the zone-center vibrations. Copyright © 2008 John Wiley & Sons, Ltd.</P>
-
Anuj Kumar,Dipak Kumar Das,Raj Kishore Sharma,Manickam Selvaraj,Mohammed A. Assiri,Saira Ajmal,Guoxin Zhang,Ram K. Gupta,Ghulam Yasin 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-
Although the N4-macrocyclic ligands have been used to develop single-atom catalysts (SACs), their utilizationfor the construction of dual-atom catalysts (DACs) for electrocatalytic oxygen reduction reaction(ORR) is poorly investigated. Herein, a binuclear phthalocyanine (bN-Pc) was explored as a theoreticalmodel for the construction of FeFe-bN-Pc, CoCo-bN-Pc, and FeCo-bN-Pc dual-atom-site configurationsand their ORR activity along with mechanisms were investigated systematically in alkaline media, usingdensity functional theory (DFT) calculations. The results indicated that the dual-atom-bN-Pc models, havingclose proximity between adjacent metals, invited individual O-atom of O2 for coordination on bothsites, forming a cis-bridged-O2 adduct. The Gibbs free energy studies showed that the decompositionof O2 on dual-atom sites was the rate-determining step, and the Fe-Co-bN-Pc had a lower energy barrier(0.591 eV) for this step as compared to Fe-Fe-bN-Pc (0.641 eV) and Co-Co-bN-Pc (0.692 eV), which justifiesits stronger ORR performance. The synergistic effect of Fe-Co collaboration, the close proximity ofFe-Co, and the significant e- donation from the 3d-orbital of active sites into the *orbital of O2 can beattributed to this decrease in limiting the potential for the rate-determining step on Fe-Co-bN-Pc. Forfuture ORR electrocatalysts, this work offers a scientific and engineering perspective on the constructionof dual-atom active sites employing molecular moieties.
ScienceON
KISS연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
