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- 저자 : Naidu, Edwin CS (검색결과 171 건)
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Naidu, C Kumaraswamy,Suneetha, Y Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.4
One of the most common cancer types faced by the women around the world is breast cancer. Among the several low, moderate and high penetrance genes conferring susceptibility to breast cancer, PTEN is one which is known to be mutated in many tumor types. In this study, we predicted and analyzed the impact of three deleterious coding non-synonymous single nucleotide polymorphisms rs121909218 (G129E), rs121909229 (R130Q) and rs57374291 (D107N) in the PTEN gene on the phenotype of breast tumors using computational tools SIFT, Polyphen-2, PROVEAN, MUPro, POPMusic and the GETAREA server.
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Valuable rubidium extraction from potassium reduced seawater brine
Naidu, Gayathri,Jeong, Sanghyun,Choi, Youngkwon,Song, Min Hyung,Oyunchuluun, Undram,Vigneswaran, Saravanamuthu Elsevier 2018 Journal of cleaner production Vol.174 No.-
<P><B>Abstract</B></P> <P>Extraction of rubidium (Rb) which is an economically valuable metal from seawater reverse osmosis (SWRO) brine is beneficial. However, potassium (K) in SWRO brine hinders Rb extraction. Natural clinoptilolite zeolite in powder form was able to selectively remove K from SWRO brine (Langmuir maximum sorption, Qmax (cal.) = 57.47 ± 0.09 mg/g). An integrated submerged membrane sorption reactor (SMSR) containing zeolite powder achieved 65% K removal from SWRO brine. Periodic replacement of zeolite in SMSR, coupled with membrane backwashing was effective in maintaining a high K removal efficiency and a stable transmembrane pressure. Less than 5% Rb losses occurred along with K sorption, establishing the high K selectivity by zeolite in SWRO brine. Utilization of K loaded zeolite as a slow release fertilizer would be beneficial for agriculture. In SWRO brine with reduced K contents, the Rb sorption efficiency of polymer encapsulated potassium copper hexacyanoferrate (KCuFC(PAN)) sorbent, increased significantly from 18% to 83%.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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MODIFIED KRASNOSELSKI-MANN ITERATIONS FOR NONEXPANSIVE MAPPINGS IN HILBERT SPACES
Naidu, S.V.R.,Sangago, Mengistu-Goa The Korean Society for Computational and Applied M 2010 Journal of applied mathematics & informatics Vol.28 No.3
Let K be a nonempty closed convex subset of a real Hilbert space H. Let T : K $\rightarrow$ K be a nonexpansive mapping with a nonempty fixed point set Fix(T). Let f : K $\rightarrow$ K be a contraction mapping. Let {$\alpha_n$} and {$\beta_n$} be sequences in (0, 1) such that $\lim_{x{\rightarrow}0}{\alpha}_n=0$, (0.1) $\sum_{n=0}^{\infty}\;{\alpha}_n=+{\infty}$, (0.2) 0 < a ${\leq}\;{\beta}_n\;{\leq}$ b < 1 for all $n\;{\geq}\;0$. (0.3) Then it is proved that the modified Krasnoselski-Mann iterative sequence {$x_n$} given by {$x_0\;{\in}\;K$, $y_n\;=\;{\alpha}_{n}f(x_n)+(1-\alpha_n)x_n$, $n\;{\geq}\;0$, $x_{n+1}=(1-{\beta}_n)y_n+{\beta}_nTy_n$, $n\;{\geq}\;0$, (0.4) converges strongly to a point p $\in$ Fix(T} which satisfies the variational inequality <p - f(p), p - z> $\leq$ 0, z $\in$ Fix(T). (0.5) This result improves and extends the corresponding results of Yao et al[Y.Yao, H. Zhou, Y. C. Liou, Strong convergence of a modified Krasnoselski-Mann iterative algorithm for non-expansive mappings, J Appl Math Com-put (2009)29:383-389.
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Naidu, Sudhakar,Ahn, Hyungju,Gong, Jinsam,Kim, Bokyung,Ryu, Du Yeol American Chemical Society 2011 Macromolecules Vol.44 No.15
<P>The phase transitions of lithium perchlorate (LiClO<SUB>4</SUB>)- doped polystyrene-<I>b</I>-poly(2-vinylpyridine) (PS-<I>b</I>-P2VP) were studied as a function of temperature and ion salt concentration using <I>in situ</I> small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). Incorporation of LiClO<SUB>4</SUB> into an asymmetric, disordered PS-<I>b</I>-P2VP copolymer produced temperature-dependent order–disorder (ODT) and order–order transitions (OOTs) from spherical to lamellar microphases. The effective interaction parameter (χ<SUB>eff</SUB>) between two block components was evaluated for low molecular weight LiClO<SUB>4</SUB>-doped PS-<I>b</I>-P2VP in a disordered state. With increasing quantities of LiClO<SUB>4</SUB>, a remarkable increase in χ along with a volumetric change produced by the selective coordination of LiClO<SUB>4</SUB> to the ionophilic P2VP block led to morphological transitions from disordered (DIS) to body-centered cubic spherical (BCC) to hexagonally packed cylindrical (HEX) to lamellar (LAM) structures. We also demonstrate that the ionic conductivity in the samples quenched from the different structures is morphology-independent, while it increases with increasing salt concentration.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2011/mamobx.2011.44.issue-15/ma200429v/production/images/medium/ma-2011-00429v_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ma200429v'>ACS Electronic Supporting Info</A></P>
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Fouling study on vacuum-enhanced direct contact membrane distillation for seawater desalination
Naidu, Gayathri,Jeong, Sanghyun,Vigneswaran, Saravanamuthu,Jang, Eun-Kyung,Choi, Yong-Jun,Hwang, Tae-Mun Informa UK (Taylor Francis) 2016 Desalination and Water Treatment Vol.57 No.22
<P>Vacuum-enhanced direct contact membrane distillation (VE-DCMD) has been proposed to improve the DCMD system performance with better effective energy efficiency. However, the higher driving forces by the presence of vacuum pressure at permeate side of the VE-DCMD system could contribute to higher fouling development. In this study, thus, the biochemical fouling development of VE-DCMD with different vacuum pressures (700, 500, and 300mbar) for seawater desalination was investigated in comparison with DCMD (1,000mbar of pressure applied). VE-DCMD showed a significant increase in initial permeate flux while its flux decline was faster than DCMD. Low molecular weight (LMW) organics were found to be a dominant organic foulant on DCMD with thermally disaggregated humic substances (HS) to LMW HS-like organics. On the other hand, the presence of vacuum reduced the disaggregation HS to LMW HS-like organics. However, high driving force of VE-DCMD caused higher deposition of organic foulant including the LMW organics as well as HS. It also led to the higher LMW organic contents in permeate. Fluorescence excitation-emission matrix (F-EEM) analysis result showed that fulvic-like organic is a dominant HS foulant in VE-DCMD. Fouling development on membrane was observed using scanning electron microscope, contact angle, and confocal laser scanning microscope.</P>
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A critical review on remediation, reuse, and resource recovery from acid mine drainage
Naidu, Gayathri,Ryu, Seongchul,Thiruvenkatachari, Ramesh,Choi, Youngkwon,Jeong, Sanghyun,Vigneswaran, Saravanamuthu Elsevier Applied Science Publishers 2019 Environmental pollution Vol.247 No.-
<P><B>Abstract</B></P> <P>Acid mine drainage (AMD) is a global environmental issue. Conventionally, a number of active and passive remediation approaches are applied to treat and manage AMD. Case studies on remediation approaches applied in actual mining sites such as lime neutralization, bioremediation, wetlands and permeable reactive barriers provide an outlook on actual long-term implications of AMD remediation. Hence, in spite of available remediation approaches, AMD treatment remains a challenge. The need for sustainable AMD treatment approaches has led to much focus on water reuse and resource recovery. This review underscores (i) characteristics and implication of AMD, (ii) remediation approaches in mining sites, (iii) alternative treatment technologies for water reuse, and (iv) resource recovery. Specifically, the role of membrane processes and alternative treatment technologies to produce water for reuse from AMD is highlighted. Although membrane processes are favorable for water reuse, they cannot achieve resource recovery, specifically selective valuable metal recovery. The approach of integrated membrane and conventional treatment processes are especially promising for attaining both water reuse and recovery of resources such as sulfuric acid, metals and rare earth elements. Overall, this review provides insights in establishing reuse and resource recovery as the holistic approach towards sustainable AMD treatment. Finally, integrated technologies that deserve in depth future exploration is highlighted.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Acid mine drainage (AMD) is a global environmental and economic challenge. </LI> <LI> Current AMD remediation applied at real sites and its limitations are highlighted. </LI> <LI> AMD challenges must be addressed through sustainable treatment approaches. </LI> <LI> Water reuse and valuable resource recovery potentially offset AMD treatment cost. </LI> <LI> Integrated processes using membranes are prospective approaches for AMD treatment. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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