Series of animal feces and meat samples artificially contaminated with strains of Escherichia col... more Series of animal feces and meat samples artificially contaminated with strains of Escherichia coli O157 isolated from different sources were tested by both an immunomagnetic separation (IMS)-based method and a PCR method using primers specific for a portion of the rfbE gene of E. coli O157. IMS is laborious and time consuming but ends up with the isolation of the
We report a simple process to solubilize high weight fraction single-wall carbon nanotubes in wat... more We report a simple process to solubilize high weight fraction single-wall carbon nanotubes in water by nonspecific physical adsorption of sodium dodecylbenzene sulfonate. The diameter distribution of nanotubes in the dispersion, measured by Atomic Force Microscopy (AFM), showed that even at 20 mg/ml, ˜ 63 5% of single-wall carbon nanotubes bundles exfoliated into single tubes. A measure of the length
Single wall carbon nanotubes (SWCNTs) are advanced materials with the potential for a myriad of d... more Single wall carbon nanotubes (SWCNTs) are advanced materials with the potential for a myriad of diverse applications, including biological technologies and large-scale usage with the potential for environmental impacts. SWCNTs have been exposed to developing organisms to determine their effects on embryogenesis, and results have been inconsistent arising, in part, from differing material quality, dispersion status, material size, impurity from catalysts and stability. For this study, we utilized highly purified SWCNT samples with short, uniform lengths (145 ± 17 nm) well dispersed in solution. To test high exposure doses, we microinjected > 500 µg ml(-1) SWCNT concentrations into the well-established embryogenesis model, Xenopus laevis, and determined embryo compatibility and subcellular localization during development. SWCNTs localized within cellular progeny of the microinjected cells, but were heterogeneously distributed throughout the target-injected tissue. Co-registering un...
Structural materials are the basic necessity of this advanced society. Thus, to develop new funda... more Structural materials are the basic necessity of this advanced society. Thus, to develop new fundamental materials with higher strength and better resistance to heat changes, one should have basic knowledge about the nanocomposite and their constituents. This book provide basic insight into the general knowledge of nanomaterials with special emphasis towards carbon nanotubes (CNTs), their functionalization and there use in various fabrication of nanocomposites. The development of nanocomposites using nanotube fillers has evolved very quickly owing to unique features (tensile strength, electrical and thermal conductivity) of CNTs hence it is highly important to understand the driving forces (concentrations, functional groups, chirality, temperature etc) behind homogenous dispersion in the various matrices. Keeping in mind these motivations, we have compiled this book that will provide young researchers with basic knowledge about synthesis of carbon nanotubes and how the several parame...
Buyya/Market-Oriented Grid and Utility Computing, 2009
... PAVAN BALAJI, PONNUSWAMY SADAYAPPAN, AND MOHAMMAD ISLAM ... 0 Remove all waiting jobs from Sn... more ... PAVAN BALAJI, PONNUSWAMY SADAYAPPAN, AND MOHAMMAD ISLAM ... 0 Remove all waiting jobs from Snew and place them into a Temporary List (TL) Add the new job J into the TL Sort the TL using the appropriate heuristic function (eg EDF) Snew ˘ for each job Ji from TL ...
Single wall carbon nanotubes are high aspect ratio nanomaterials being developed for use in mater... more Single wall carbon nanotubes are high aspect ratio nanomaterials being developed for use in materials, technological and biological applications due to their high mechanical stiffness, optical properties and chemical inertness. Because of their prevalence, it is inevitable that biological systems will be exposed to nanotubes, yet studies of the effects of nanotubes on developing embryos have been inconclusive and are lacking for single wall carbon nanotubes exposed to the widely studied model organism Xenopus laevis (African clawed frog). Microinjection of experimental substances into the Xenopus embryo is a standard technique for toxicology studies and cellular lineage tracing. Here we report the surprising finding that superficial (12.5 ± 7.5 µm below the membrane) microinjection of nanotubes dispersed with Pluronic F127 into one- to two-cell Xenopus embryos resulted in the formation and expulsion of compacted, nanotube-filled, punctate masses, at the blastula to mid-gastrula deve...
European journal of pharmaceutics and biopharmaceutics : official journal of Arbeitsgemeinschaft fur Pharmazeutische Verfahrenstechnik e.V, Jan 30, 2015
Small interfering RNA (siRNA)-mediated gene silencing represents a promising strategy for treatin... more Small interfering RNA (siRNA)-mediated gene silencing represents a promising strategy for treating diseases such as cancer; however, specific gene silencing requires an effective delivery system to overcome the instability and low transfection efficiency of siRNAs. To address this issue, a polysorbitol-based transporter (PSOT) was prepared by low molecular-weight branched polyethylenimine (bPEI) crosslinked with sorbitol diacrylate (SDA). Osteopontin (OPN) gene, which is highly associated with non-small cell lung cancer (NSCLC) was targeted by siRNA therapy using siRNA targeting OPN (siOPN). Characterization study confirmed that PSOT formed compact complexes with siOPN and protected siOPN against degradation by RNase. PSOT/siOPN complexes demonstrated low cytotoxicity and enhanced transfection efficiency in vitro, suggesting that this carrier may be suitable for gene silencing. In the A549 and H460 lung cancer cell lines, PSOT/siOPN complexes demonstrated significant silencing effic...
Journal of physics. Condensed matter : an Institute of Physics journal, Jan 22, 2015
Raman scattering in thin film La0.2Sr0.8FeO3-δ on MgO(0 0 1) collected at 300 K after different s... more Raman scattering in thin film La0.2Sr0.8FeO3-δ on MgO(0 0 1) collected at 300 K after different stages of annealing at selected temperatures T (300 K < T < 543 K, to 10 h) and analysis reveal changes in spectral characteristics due to a loss of oxygen, onset of oxygen vacancy-induced disorder, and activation of Raman-inactive modes that are attributed to symmetry lowering. The interpretation is further supported by carrier transport measurements under identical conditions showing orders of magnitude increase in the resistivity induced by oxygen loss. After prolonged annealing in air, evolution of the spectrum signals the appearance of a possible topotactic transformation of the crystal structure from that of the rhombohedral ABO3 perovskites to that of Brownmillerite-like structure consisting of octahedrally and tetrahedrally coordinated Fe atoms.
Frontiers in Optics 2004/Laser Science XXII/Diffractive Optics and Micro-Optics/Optical Fabrication and Testing, 2004
Abstract We describe recent results in the application of THz time-domain spectroscopy to examine... more Abstract We describe recent results in the application of THz time-domain spectroscopy to examine photo-induced conductivity in insulators. These investigations permit us to determine the fundamental interactions governing the observed charge transport. ...
International Conference on Information Technology: Coding and Computing, 2005
This paper proposes a new method of bandwidth sharing policy which dynamically adjusts the bandwi... more This paper proposes a new method of bandwidth sharing policy which dynamically adjusts the bandwidth among the different services within the cell with changing network traffics. The proposed method, called min-max fairness scheme, exhibits good performances in cellular network applications where bandwidth is at a premium such as in multimedia communications. The improved efficiency of the scheme is achieved by
The paper describes a methodology for automatic hull form generation of ships with some desired p... more The paper describes a methodology for automatic hull form generation of ships with some desired performances using artificial intelligence techniques. The whole implementation process is divided into three main components. First of all the half-breadth weight matrices are generated that would provide population with pre-fitness by examining the relationship of the hull form with the principal dimensions of a number
Frustrated triangular molecular magnets such as Cu3 are characterized by a doubly generate S=1/2 ... more Frustrated triangular molecular magnets such as Cu3 are characterized by a doubly generate S=1/2 ground-state (GS) with opposite chirality. Recently it has been proposed theoretically [1] and verified by ab-initio calculations [2] that an external electric field can efficiently couple these two chiral spin states, even in the absence of spin-orbit interaction (SOI). SOIs are nevertheless important, since they introduce
Series of animal feces and meat samples artificially contaminated with strains of Escherichia col... more Series of animal feces and meat samples artificially contaminated with strains of Escherichia coli O157 isolated from different sources were tested by both an immunomagnetic separation (IMS)-based method and a PCR method using primers specific for a portion of the rfbE gene of E. coli O157. IMS is laborious and time consuming but ends up with the isolation of the
We report a simple process to solubilize high weight fraction single-wall carbon nanotubes in wat... more We report a simple process to solubilize high weight fraction single-wall carbon nanotubes in water by nonspecific physical adsorption of sodium dodecylbenzene sulfonate. The diameter distribution of nanotubes in the dispersion, measured by Atomic Force Microscopy (AFM), showed that even at 20 mg/ml, ˜ 63 5% of single-wall carbon nanotubes bundles exfoliated into single tubes. A measure of the length
Single wall carbon nanotubes (SWCNTs) are advanced materials with the potential for a myriad of d... more Single wall carbon nanotubes (SWCNTs) are advanced materials with the potential for a myriad of diverse applications, including biological technologies and large-scale usage with the potential for environmental impacts. SWCNTs have been exposed to developing organisms to determine their effects on embryogenesis, and results have been inconsistent arising, in part, from differing material quality, dispersion status, material size, impurity from catalysts and stability. For this study, we utilized highly purified SWCNT samples with short, uniform lengths (145 ± 17 nm) well dispersed in solution. To test high exposure doses, we microinjected > 500 µg ml(-1) SWCNT concentrations into the well-established embryogenesis model, Xenopus laevis, and determined embryo compatibility and subcellular localization during development. SWCNTs localized within cellular progeny of the microinjected cells, but were heterogeneously distributed throughout the target-injected tissue. Co-registering un...
Structural materials are the basic necessity of this advanced society. Thus, to develop new funda... more Structural materials are the basic necessity of this advanced society. Thus, to develop new fundamental materials with higher strength and better resistance to heat changes, one should have basic knowledge about the nanocomposite and their constituents. This book provide basic insight into the general knowledge of nanomaterials with special emphasis towards carbon nanotubes (CNTs), their functionalization and there use in various fabrication of nanocomposites. The development of nanocomposites using nanotube fillers has evolved very quickly owing to unique features (tensile strength, electrical and thermal conductivity) of CNTs hence it is highly important to understand the driving forces (concentrations, functional groups, chirality, temperature etc) behind homogenous dispersion in the various matrices. Keeping in mind these motivations, we have compiled this book that will provide young researchers with basic knowledge about synthesis of carbon nanotubes and how the several parame...
Buyya/Market-Oriented Grid and Utility Computing, 2009
... PAVAN BALAJI, PONNUSWAMY SADAYAPPAN, AND MOHAMMAD ISLAM ... 0 Remove all waiting jobs from Sn... more ... PAVAN BALAJI, PONNUSWAMY SADAYAPPAN, AND MOHAMMAD ISLAM ... 0 Remove all waiting jobs from Snew and place them into a Temporary List (TL) Add the new job J into the TL Sort the TL using the appropriate heuristic function (eg EDF) Snew ˘ for each job Ji from TL ...
Single wall carbon nanotubes are high aspect ratio nanomaterials being developed for use in mater... more Single wall carbon nanotubes are high aspect ratio nanomaterials being developed for use in materials, technological and biological applications due to their high mechanical stiffness, optical properties and chemical inertness. Because of their prevalence, it is inevitable that biological systems will be exposed to nanotubes, yet studies of the effects of nanotubes on developing embryos have been inconclusive and are lacking for single wall carbon nanotubes exposed to the widely studied model organism Xenopus laevis (African clawed frog). Microinjection of experimental substances into the Xenopus embryo is a standard technique for toxicology studies and cellular lineage tracing. Here we report the surprising finding that superficial (12.5 ± 7.5 µm below the membrane) microinjection of nanotubes dispersed with Pluronic F127 into one- to two-cell Xenopus embryos resulted in the formation and expulsion of compacted, nanotube-filled, punctate masses, at the blastula to mid-gastrula deve...
European journal of pharmaceutics and biopharmaceutics : official journal of Arbeitsgemeinschaft fur Pharmazeutische Verfahrenstechnik e.V, Jan 30, 2015
Small interfering RNA (siRNA)-mediated gene silencing represents a promising strategy for treatin... more Small interfering RNA (siRNA)-mediated gene silencing represents a promising strategy for treating diseases such as cancer; however, specific gene silencing requires an effective delivery system to overcome the instability and low transfection efficiency of siRNAs. To address this issue, a polysorbitol-based transporter (PSOT) was prepared by low molecular-weight branched polyethylenimine (bPEI) crosslinked with sorbitol diacrylate (SDA). Osteopontin (OPN) gene, which is highly associated with non-small cell lung cancer (NSCLC) was targeted by siRNA therapy using siRNA targeting OPN (siOPN). Characterization study confirmed that PSOT formed compact complexes with siOPN and protected siOPN against degradation by RNase. PSOT/siOPN complexes demonstrated low cytotoxicity and enhanced transfection efficiency in vitro, suggesting that this carrier may be suitable for gene silencing. In the A549 and H460 lung cancer cell lines, PSOT/siOPN complexes demonstrated significant silencing effic...
Journal of physics. Condensed matter : an Institute of Physics journal, Jan 22, 2015
Raman scattering in thin film La0.2Sr0.8FeO3-δ on MgO(0 0 1) collected at 300 K after different s... more Raman scattering in thin film La0.2Sr0.8FeO3-δ on MgO(0 0 1) collected at 300 K after different stages of annealing at selected temperatures T (300 K < T < 543 K, to 10 h) and analysis reveal changes in spectral characteristics due to a loss of oxygen, onset of oxygen vacancy-induced disorder, and activation of Raman-inactive modes that are attributed to symmetry lowering. The interpretation is further supported by carrier transport measurements under identical conditions showing orders of magnitude increase in the resistivity induced by oxygen loss. After prolonged annealing in air, evolution of the spectrum signals the appearance of a possible topotactic transformation of the crystal structure from that of the rhombohedral ABO3 perovskites to that of Brownmillerite-like structure consisting of octahedrally and tetrahedrally coordinated Fe atoms.
Frontiers in Optics 2004/Laser Science XXII/Diffractive Optics and Micro-Optics/Optical Fabrication and Testing, 2004
Abstract We describe recent results in the application of THz time-domain spectroscopy to examine... more Abstract We describe recent results in the application of THz time-domain spectroscopy to examine photo-induced conductivity in insulators. These investigations permit us to determine the fundamental interactions governing the observed charge transport. ...
International Conference on Information Technology: Coding and Computing, 2005
This paper proposes a new method of bandwidth sharing policy which dynamically adjusts the bandwi... more This paper proposes a new method of bandwidth sharing policy which dynamically adjusts the bandwidth among the different services within the cell with changing network traffics. The proposed method, called min-max fairness scheme, exhibits good performances in cellular network applications where bandwidth is at a premium such as in multimedia communications. The improved efficiency of the scheme is achieved by
The paper describes a methodology for automatic hull form generation of ships with some desired p... more The paper describes a methodology for automatic hull form generation of ships with some desired performances using artificial intelligence techniques. The whole implementation process is divided into three main components. First of all the half-breadth weight matrices are generated that would provide population with pre-fitness by examining the relationship of the hull form with the principal dimensions of a number
Frustrated triangular molecular magnets such as Cu3 are characterized by a doubly generate S=1/2 ... more Frustrated triangular molecular magnets such as Cu3 are characterized by a doubly generate S=1/2 ground-state (GS) with opposite chirality. Recently it has been proposed theoretically [1] and verified by ab-initio calculations [2] that an external electric field can efficiently couple these two chiral spin states, even in the absence of spin-orbit interaction (SOI). SOIs are nevertheless important, since they introduce
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