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A Novel Radiation-Resistant Strain of Filobasidium sp. Isolated from the West Sea of Korea
Harinder Singh,Ha Ram Kim,Hyunpa Song,Min Ho Joe,Dong Ho Kim,Yong Sun Bahn,Jong Il Choi,Sangyong Lim 한국미생물생명공학회(구 한국산업미생물학회) 2013 Journal of microbiology and biotechnology Vol.23 No.11
A novel radiation-resistant Filobasidium sp. yeast strain was isolated from seawater. Along with this strain, a total of 656 yeast isolates were purified from seawater samples collected from three locations in the West Sea of Korea and assessed for their radiation tolerance. Among these isolates, five were found to survive a 5 kGy radiation dose. The most radiationresistant strain was classified as Filobasidium sp. based on 18S rDNA sequence analysis and hence was named Filobasidium RRY1 (Radiation-Resistant Yeast 1). RRY1 differed from F. elegans, which is closely related to RRY1, in terms of the optimal growth temperature and radiation resistance, and was resistant to high doses of γ-ionizing radiation (D10: 6-7 kGy). When exposed to a high dose of 3 kGy irradiation, the RRY1 cells remained intact and undistorted, with negligible cell death. When these irradiated cells were allowed to recover, the cells fully repaired their genomic DNA within 3 h of growth recovery. This is the first report in which a radiation-resistant response has been investigated at the physiological, morphological, and molecular levels in a strain of Filobasidium sp.
( Harinder Singh ),( Deepti Appukuttan ),( Sang Yong Lim ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.8
The present study shows that DR1114 (Hsp20), a small heat shock protein of the radiationresistant bacterium Deinococcus radiodurans, enhances tolerance to hydrogen peroxide (H2O2) stress when expressed in Escherichia coli. A protein profile comparison showed that E. coli cells overexpressing D. radiodurans Hsp20 (EC-pHsp20) activated the redox state proteins, thus maintaining redox homeostasis. The cells also showed increased expression of pseudouridine (psi) synthases, which are important to the stability and proper functioning of structural RNA molecules. We found that the D. radiodurans mutant strain, which lacks a psi synthase (DR0896), was more sensitive to H2O2 stress than wild type. These suggest that an increased expression of proteins involved in the control of redox state homeostasis along with more stable ribosomal function may explain the improved tolerance of EC-pHsp20 to H2O2 stress.
Extensive investigations of photon interaction properties for Zn x Te 100-x alloys
Harinder Singh,Jeewan Sharma,Tejbir Singh 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.8
An extensive investigation of photon interaction properties has been made for ZnxTe100-x alloys (wherex ¼ 5, 20, 30, 40, 50) to explore its possible use in sensing and shielding gamma radiations. The resultsshow better and stable response of ZnTe alloys for various photon interaction properties over the wideenergy range, with an additional benefit of ease in fabrication due to lower melting points of Zn and Te. Mass attenuation coefficient values show strong dependence on photon energy as well as composition. Effective atomic number has maximum value for Zn5Te95 and lowest for Zn50Te50 in the entire energyregion. The alloy sample with maximum Zeff shows minimal value of Ne and vice versa. Mean free pathfollows inverse trend as observed for mass attenuation coefficient. The exposure and energy absorptionbuildup factors depend upon photon energy, penetration thickness and composition (effective atomicnumber) of ZnxTe100-x alloys. It finds its application for sensing and shielding from highly energetic andhighly penetrating photons at sites where radioactive materials were used and visibility of material is nota big constraint. Further, energy down conversion property of ZnTe alloys with subsequent emission ingreen band suggests its potential use in sensing gamma photons.
Appukuttan, Deepti,Singh, Harinder,Park, Sun-Ha,Jung, Jong-Hyun,Jeong, Sunwook,Seo, Ho Seong,Choi, Yong Jun,Lim, Sangyong American Society for Microbiology 2016 Applied and environmental microbiology Vol.82 No.4
<P>Cellular robustness is an important trait for industrial microbes, because the microbial strains are exposed to a multitude of different stresses during industrial processes, such as fermentation. Thus, engineering robustness in an organism in order to push the strains toward maximizing yield has become a significant topic of research. We introduced the deinococcal response regulator DR1558 into Escherichia coli (strain Ec-1558), thereby conferring tolerance to hydrogen peroxide (H2O2). The reactive oxygen species (ROS) level in strain Ec-1558 was reduced due to the increased KatE catalase activity. Among four regulators of the oxidative-stress response, OxyR, RpoS, SoxS, and Fur, we found that the expression of rpoS increased in Ec-1558, and we confirmed this increase by Western blot analysis. Electrophoretic mobility shift assays showed that DR1558 bound to the rpoS promoter. Because the alternative sigma factor RpoS regulates various stress resistance-related genes, we performed stress survival analysis using an rpoS mutant strain. Ec-1558 was able to tolerate a low pH, a high temperature, and high NaCl concentrations in addition to H2O2, and the multistress tolerance phenotype disappeared in the absence of rpoS. Microarray analysis clearly showed that a variety of stress-responsive genes that are directly or indirectly controlled by RpoS were upregulated in strain Ec-1558. These findings, taken together, indicate that the multistress tolerance conferred by DR1558 is likely routed through RpoS. In the present study, we propose a novel strategy of employing an exogenous response regulator from polyextremophiles for strain improvement.</P>
U-SmART - SMALL APERTURE ROBOTIC TELESCOPES FOR UNIVERSITIES
GUPTA, RANJAN,SINGH, HARINDER P.,KANBUR, SHASHI M.,SCHRIMPF, ANDREAS,DERSCH, CHRISTIAN The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
A group of universities have come together with the aim of designing and developing Small Aperture Robotic Telescopes (SmART) for use by students to observe variable stars and transient follow-ups. The group is deliberating on the components of the robotic system; e.g. the telescope, the mount, the back-end camera, control software, and their integration keeping in mind the scientific objectives. The prototype might then be replicated by all the participating universities to provide round the clock observations from sites spread evenly in longitude across the globe. Progress made so far is reported in this paper.
BIVARIATE DYNAMIC CUMULATIVE RESIDUAL TSALLIS ENTROPY
SATI, MADAN MOHAN,SINGH, HARINDER The Korean Society for Computational and Applied M 2017 Journal of applied mathematics & informatics Vol.35 No.1
Recently, Sati and Gupta (2015) proposed two measures of uncertainty based on non-extensive entropy, called the dynamic cumulative residual Tsallis entropy (DCRTE) and the empirical cumulative Tsallis entropy. In the present paper, we extend the definition of DCRTE into the bivariate setup and study its properties in the context of reliability theory. We also define a new class of life distributions based on bivariate DCRTE.
BIVARIATE DYNAMIC CUMULATIVE RESIDUAL TSALLIS ENTROPY
MADAN MOHAN SATI,HARINDER SINGH 한국전산응용수학회 2017 Journal of applied mathematics & informatics Vol.35 No.1
Recently, Sati and Gupta (2015) proposed two measures of uncertainty based on non-extensive entropy, called the dynamic cumulative residual Tsallis entropy (DCRTE) and the empirical cumulative Tsallis entropy. In the present paper, we extend the denition of DCRTE into the bivariate setup and study its properties in the context of reliability theory. We also dene a new class of life distributions based on bivariate DCRTE.
Amandeep Kaur Shahi,Harinder Singh KINFORMS 2015 Management Review Vol.10 No.1
The study is an endeavour to analyse the comparative performance of health insurance business of public and private general insurance companies for the period from 2006-07 to 2011-12 using the Mann- Whitney Test. The comparative performance of the health insurance business of 4 public, 8 private general insurance companies and 2 standalone health insurance companies has been examined using the Claim Ratio and Net Retention Ratio. These ratios have been analysed and interpreted by calculating mean, median, standard deviation and coefficient of variation. It has been found that the mean of claim ratio was -2.82 (p>0.05) and mean of net retention ratio was -1.98 (p>0.05) which showed significant difference between the claim ratio and net retention ratio of health insurance business of public and private general insurance companies.
Arijit Dutta Gupta,Balendu Shekher Giri,Eldon R Rene,Preeti Chaturvedi,Mandavi Goswami,Harinder Singh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
As(III) presence in low concentration (1-5 mg/L) in water presents a challenging problem in its removal. In the present study, biochar prepared by the pyrolysis of mustard cake and loaded with Fe-Mn binary oxides through hydrothermal technique was used for adsorptive removal of As(III) from water in batch and continuous modes. The synthesised biochar exhibited mesoporous structures in the range of 2-50 nm (based on BET analysis). The maximum adsorption capacity (95.7 mg/g) obtained using biochar loaded with both Fe-Mn oxides was found to be 1.4 times higher than that of pristine biochar. The adsorption equilibria was best described by Freundlich isotherm (based on R² and χ²) suggesting that the As(III) adsorption was multilayered. The external mass transfer coefficients (βL = 10<SUP>-5</SUP> cm²/s) were observed to be higher than the film (Df = 10<SUP>-7</SUP> – 10<SUP>-9</SUP> cm²/s) and intraparticle (Di = 10<SUP>-9</SUP> cm²/s) diffusivities in batch mode. In column studies, Thomas model gave the best correlation coefficient (R² > 0.95) and the adsorption was limited by external mass transfer. Kinetic rate constant decreased with increase in initial As(III) concentration and flow rate. The oxide loaded biochar exhibited reusability up to three times for As(III) removal.
Arijit Dutta Gupta,Balendu Shekher Giri,Eldon R Rene,Preeti Chaturvedi,Mandavi Goswami,Harinder Singh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
As(III) presence in low concentration (1–5 mg/L) in water presents a challenging problem in its removal. In the present study, biochar prepared by the pyrolysis of mustard cake and loaded with Fe-Mn binary oxides through hydrothermal technique was used for adsorptive removal of As(III) from water in batch and continuous modes. The synthesised biochar exhibited mesoporous structures in the range of 2–50 nm (based on BET analysis). The maximum adsorption capacity (95.7 mg/g) obtained using biochar loaded with both Fe-Mn oxides was found to be 1.4 times higher than that of pristine biochar. The adsorption equilibria was best described by Freundlich isotherm (based on R2 and χ2) suggesting that the As(III) adsorption was multilayered. The external mass transfer coefficients (βL = 10−5 cm2/s) were observed to be higher than the film (Df = 10−7 – 10−9 cm2/s) and intraparticle (Di = 10−9 cm2/s) diffusivities in batch mode. In column studies, Thomas model gave the best correlation coefficient (R2 > 0.95) and the adsorption was limited by external mass transfer. Kinetic rate constant decreased with increase in initial As(III) concentration and flow rate. The oxide loaded biochar exhibited reusability up to three times for As(III) removal.