http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
The Horizontal Branch Population of NGC 1851 as Revealed by the Ultraviolet Imaging Telescope (UVIT)
Subramaniam, Annapurni,Sahu, Snehalata,Postma, Joseph E.,Cô,té,, Patrick,Hutchings, J. B.,Darukhanawalla, N.,Chung, Chul,Tandon, S. N.,Rao, N. Kameswara,George, K.,Ghosh, S. K.,Girish, V.,M American Astronomical Society 2017 The Astronomical journal Vol.154 No.6
<P>We present the UV photometry of the globular cluster NGC 1851 using images acquired with the Ultraviolet Imaging Telescope (UVIT) onboard the ASTROSAT satellite. Point-spread function fitting photometric data derived from images in two far-UV (FUV) filters and one near-UV (NUV) filter are used to construct color-magnitude diagrams (CMDs), in combination with HST and ground-based optical photometry. In the FUV, we detect only the bluest part of the cluster horizontal branch (HB); in the NUV, we detect the full extent of the HB, including the red HB, blue HB, and a small number of RR Lyrae stars. UV variability was detected in 18 RR Lyrae stars, and three new variables were also detected in the central region. The UV/optical CMDs are then compared with isochrones of different age and metallicity (generated using Padova and BaSTI models) and synthetic HB (using helium-enhanced Y2 models). We are able to identify two populations among the HB stars, which are found to have either an age range of 10-12. Gyr, or a range in Y-ini of 0.23-0.28, for a metallicity of [Fe/H] = -1.2 to -1.3. These estimations from the UV CMDs are consistent with those from optical studies. The almost-complete sample of the HB stars tends to show a marginal difference in spatial/azimuthal distribution among the blue and red HB stars. Thus, this study showcases the capability of UVIT, with its excellent resolution and large field of view, to study the hot stellar population in Galactic globular clusters.</P>
Vellingiri, B.,Shanmugam, S.,Subramaniam, M.D.,Balasubramanian, B.,Meyyazhagan, A.,Alagamuthu, K.,Prakash, V.,Shafiahammedkhan, M.,Kathannan, S.,Pappuswamy, M.,Raviganesh, B.,Anand, S.,Shahnaz N, D.,C Academic Press 2014 Ecotoxicology and environmental safety Vol.100 No.-
Ionizing radiation (IR) is known as a classical mutagen capable of inducing various kinds of stable and unstable chromosomal aberrations (CA) including the possibility of increasing the incidence of DNA damage. This study aims to assess occupationally induced CA in workers chronically exposed to low doses of IR in Radiology (RL), Cardiology (CL) and Orthopedic (OL) Laboratories in hospitals of Tamil Nadu. We performed the analysis of CA by trypsin G-banding, micronucleus (MN) assay, Comet assay and Xenobiotic-metabolizing gene polymorphisms (GSTM1, GSTT1 and GSTP1) in 56 exposed and 56 control subjects who were matched for gender and age (+/-2 years). Higher degree of CA and MN frequencies were observed in exposed groups, especially in CL subjects compared to other exposed groups and controls (p<0.05). Higher frequency of DNA tail length and tail moment was observed in the CL exposed subjects compared to the RL and OL subjects. The frequencies of GSTM1 and GSTT1 null genotypes were 39.3 percent and 14.3 percent, respectively. No significant difference in allele frequencies between exposed subjects and controls were observed (p=0.0128). Using multiple linear regression analysis, statistical significance was determined for work duration and age for the CL, RL and OL workers and the examination of the possible impact by confounding factors showed few significant influences on the radiation exposure, as a specific biomarker. However, the findings from the present study suggest that, awareness should be created among the personnel exposed to radiations in hospital laboratories, highlighting the necessity of applying radiation protection principles against medical radiation exposure.
Film Diffusion Mechanism of Methyl Parathion in Biopolymers: Kinetics and Thermodynamic Equilibrium
Sadasivam, Senthilkumaar,Kandasamy, Krishna S.,Ponnusamy, Kalaamani,Subramaniam Nagarajan, Ganapathi,Kang, Tae Won American Chemical Society 2011 Journal of chemical and engineering data Vol.56 No.11
<P>Sulfuric acid treated biopolymers (STB) were prepared from a lignocellulosic-based agricultural byproduct. The STB has been used as an effective adsorbent in a batch experiment for the removal of methyl parathion (MP) from aqueous solution. The as-prepared STB has been characterized by using surface area analyzer, scanning electron microscope (SEM), elemental analyzer, and proximate analysis methods. A batch adsorption study was carried out to investigate the adsorption equilibrium, kinetics, and thermodynamics as a function of agitation time, initial concentration of MP, initial pH, temperature, and carbon dose. Adsorption data were used to perform the kinetic models. The adsorption data was found to obey the Langmuir adsorption isotherm. Thermodynamic parameters of the adsorption process Δ<I>G</I>, Δ<I>S</I>, and Δ<I>H</I> were calculated, and their negative values indicate the feasible exothermic and spontaneous nature of the process. The diffusion of the MP molecule onto the biopolymer was confirmed by using the Weber–Morris equation. Reichenberg's equation shows the film diffusion of MP.</P>
Jason Wei Jian Ng,Gary John Rangel,Santha Vaithilingam,Subramaniam S. Pillay 동아시아연구원 2015 Journal of East Asian Studies Vol.15 No.2
In this article we respond to Thomas Pepinsky’s commentary on our article “2013 Malaysian Elections: Ethnic Politics or Urban Wave?” (both in this issue). We confirm that both ethnicity and urbanization play important roles in determining the incumbent ruling party’s percentage vote share in the thirteenth general election. In doing so, we address the various econometric issues raised by Pepinsky and clearly explain the advantages of our econometric methodology vis-à-vis the OLS analysis espoused by Pepinsky. Our main results indicate that Barisan National’s (BN) vote share from Bumiputera voters, regardless of urbanization levels of the parliamentary constituency, is below the 50 percent threshold. This result is surprisingly compensated by the more than 50 percent support for BN when Chinese voters are a small minority of the electorate. We also argue that Pepinsky’s statement that Malay voters are predominantly rural voters is inaccurate and provide evidence to the contrary.
Design curves for prestressed concrete rectangular beam sections based on BS 8110
Subramaniam, Kolluru V.L.,Sinha, S.N. Techno-Press 1995 Structural Engineering and Mechanics, An Int'l Jou Vol.3 No.6
Design curves have been prepared for prestressed rectangular beam section based on BS 8110, for determining area of steel for any given cross section, for stresses in concrete and steel and for the design moment. The design moment and the area of steel have been expressed in dimensionless form in terms of cross sectional dimensions and the characteristic strength of concrete. The choice and combination of design parameters result in considerably less number of curves as aid for design of rectangular prestressed beam sections, than those reported in CP 110 (Part 3).
( Vellingiri Balachandar ),( Subramaniam Mohana Devi ),( Meyyazhagan Arun ),( S Haripriya ),( Iyer Mahalakshmi ),( Sn Dharwadkar ),( Keshavarao Sasikala ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Hepatocellular carcinoma (HCC) ids one of the most common cancer worldwide. Polymorphism in p53 and XRCC1 genes were associated with increased risk of early-onset HCC. We thus hypothesized that, these polymorphism could be more likely in South Indian population. However the status of these mutations in South Indian HCC had not been studied. Methods: In the present study 130 HCC patients and 130 control subjects were analyzed for known polymorphisms in the p53 and XRCC1 genes. Results: In the Arg194Trp polymorphism of p53 gene, we found 19.05% with Arg- 399Trp (heterozygous variant) genotype and 1.6% with 399Trp (homozygous variant) in comparison to controls who exhibited 90.39% with wild type genotype. In Arg399Gln polymorphism of XRCC1 gene, 46.17% were found to have Arg399Gln (heterozygous variant) genotype and 10.11% were found to have 399Gln (homozygous variant) genotype in comparison to controls who exhibited 55% individuals with heterozygous variant genotype and 16.75% with homozygous variant genotype. This polymorphic incidence revealed signifi cant association with advanced stages of the HCC and also well differentiated tumor. Conclusions: Thus the results of our study provide the genetic variations of p53 and XRCC1 which may contribute to the susceptibility to HCC in South India. The results suggest that, these genes could play a signifi cant role in HCC and the combined effect of these variants may interact to increase the risk of HCC in Indian population.
Rho, Jung-Rae,Subramaniam, Gurusamy,Choi, Hyukjae,Kim, Eun-Hee,Ng, Sok Peng,Yoganathan, K.,Ng, Siewbee,Buss, Antony D.,Butler, Mark S.,Gerwick, William H. American Chemical Society 2015 ORGANIC LETTERS Vol.17 No.6
<P>Gargantulide A (<B>1</B>), an extremely complex 52-membered macrolactone, was isolated from <I>Streptomyces</I> sp. A42983 and displayed moderate activity against MRSA. The planar structure of <B>1</B> was determined using 2D NMR, and its stereochemistry was partially established on the basis of NOESY correlations, <I>J</I>-based configuration analysis, and Kishi’s universal NMR database.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2015/orlef7.2015.17.issue-6/acs.orglett.5b00068/production/images/medium/ol-2015-00068j_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol5b00068'>ACS Electronic Supporting Info</A></P>