The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Gregory J. Hoplamazian - One of the best experts on this subject based on the ideXlab platform.
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News in the Interstices: The niches of mobile media in space and time
New Media & Society, 2010Co-Authors: John Dimmick, John Christian Feaster, Gregory J. HoplamazianAbstract:The recent growth of mobile channels has provided steadily increasing opportunities for individuals to access news and other mass-mediated content. Media ecological perspectives argue that the introduction of such new technologies can shift the existing biases in prevailing social systems. According to one ecological perspective, the theory of the niche, when new media technologies are successfully introduced into a domain, displacement may occur unless some alteration is made to the resource base. Interstices are conceptualized as the gaps in the routines of media users between scheduled activities. Through the use of a diary method, participants logged access to news using a variety of communication technologies, including mobile channels. Results indicated that traditional media occupied traditional niches with little evidence of displacement, while mobile channels occupied a new niche: access in the Interstices.
P. Viswanath - One of the best experts on this subject based on the ideXlab platform.
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Tunable Plasmonic Resonances in Hexagonally Ordered Gold Nanostructure Arrays with Increasing Interstice Size
Plasmonics, 2020Co-Authors: P. ViswanathAbstract:Gold nanostructure arrays were fabricated by combining colloidal lithography with inclined reactive ion etching and inclinded sputtering. Field emission scanning electron microscopy studies of this substrate show uniaxial hexagonally ordered graded nanostructure arrays with increasing Interstice at different positions. Optical spectroscopy studies in visible range reveal that these structures support localized surface plasmon resonance, surface plasmon polaritons, and hybridized modes. Optical spectra were found at each position along the direction of increasing Interstice size, and the resonances tend to redshift with position. Different morphologies lead to 50 nm spectral tunability across 10 mm length of the substrate. Based on spectral resolution, optimum peak arising due to localized surface plasmon resonance in reflectance was selected for refractive index sensing application. The sensitivity and figure of merit were evaluated at each position. The sensitivity was found to increase accompanied by decrease in figure of merit with position. The highest sensitivity of 621.6 nm/RIU is obtained for the structure in which Interstice size is maximum.
Gustavo Ballejo - One of the best experts on this subject based on the ideXlab platform.
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Nitric oxide metabolites in the lumbosacral spinal cord Interstice and cerebrospinal fluid in female rats with acute cyclophosphamide-induced cystitis: an in vivo microdialysis study
Einstein (Sao Paulo Brazil), 2013Co-Authors: Jeová Nina Rocha, Gustavo BallejoAbstract:OBJECTIVE: To determine the concentration of nitrate/nitrite in the cerebrospinal fluid and in the dorsal horn Interstice of the L6-S1 spinal cord boundary in rats with or without cystitis induced by cyclophosphamide. METHODS: All experiments were conducted using Wistar female rats. A microdialysis probe was implanted in the subarachnoid space or in the spinal cord tissue at the L6-S1 segments (confirmed histologically). Two days later, the microdialysis probe was perfused with artificial cerebrospinal fluid, containing or not NG-monomethyl-L-arginine. Samples were collected every 15 minutes and kept at -20oC. Nitrite/nitrate concentrations were determined by chemiluminescence. RESULTS: In normal animals, the mean values of nitrite/nitrate concentrations in the first microdialysate sample of the cerebrospinal fluid and of the spinal cord Interstice were similar (482.5±90.2pmol/75µL, n=20, and 505.7±11.5pmol/75µL, n=6, respectively), whereas, in the samples from rats with cystitis, these values were significantly greater (955.5±66.3pmol/75µL, n=8, and 926.5±131.7pmol/75µL, n=11, respectively). In both groups, NG-monomethyl-L- arginine caused a significant reduction in the nitrite/nitrate concentration. Interestingly, the maximal reduction of nitrite/nitrate concentration caused by NG-monomethyl-L- arginine was no greater than 30% of the initial values. CONCLUSIONS: These results constitute the first demonstration that nitrite/nitrate concentrations in the cerebrospinal fluid and spinal cord Interstice are elevated between 20- and 22 hours after cyclophosphamide-induced cystitis, and indicate that cystitis is associated with changes in the production of nitric oxide in the spinal cord segments, where most primary bladder afferents end.
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metabolitos de oxido nitrico no intersticio da medula espinhal lombossacral e no liquido cefalorraquidiano em ratas com cistite aguda induzida por ciclofosfamida um estudo in vivo com microdialise nitric oxide metabolites in the lumbosacral spinal co
2013Co-Authors: Jeová Nina Rocha, Gustavo BallejoAbstract:Objective: To determine the concentration of nitrate/nitrite in the cerebrospinal fluid and in the dorsal horn Interstice of the L6-S1 spinal cord boundary in rats with or without cystitis induced by cyclophosphamide. Methods: All experiments were conducted using Wistar female rats. A microdialysis probe was implanted in the subarachnoid space or in the spinal cord tissue at the L6-S1 segments (confirmed histologically). Two days later, the microdialysis probe was perfused with artificial cerebrospinal fluid, containing or not NGmonomethyl-L-arginine. Samples were collected every 15 minutes and kept at -20oC. Nitrite/nitrate concentrations were determined by chemiluminescence. Results: In normal animals, the mean values of nitrite/nitrate concentrations in the first microdialysate sample of the cerebrospinal fluid and of the spinal cord Interstice were similar (482.5±90.2pmol/75µL, n=20, and 505.7±11.5pmol/75µL, n=6, respectively), whereas, in the samples from rats with cystitis, these values were significantly greater (955.5±66.3pmol/75µL, n=8, and 926.5±131.7pmol/75µL, n=11, respectively). In both groups, NGmonomethyl-L- arginine caused a significant reduction in the nitrite/ nitrate concentration. Interestingly, the maximal reduction of nitrite/ nitrate concentration caused by NG-monomethyl-L- arginine was no greater than 30% of the initial values. Conclusions: These results constitute the first demonstration that nitrite/nitrate concentrations in the cerebrospinal fluid and spinal cord Interstice are elevated between 20- and 22 hours after cyclophosphamide-induced cystitis, and indicate that cystitis is associated with changes in the production of nitric oxide in the spinal cord segments, where most primary bladder afferents end.
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nitric oxide metabolites in the lumbosacral spinal cord Interstice and cerebrospinal fluid in female rats with acute cyclophosphamide induced cystitis an in vivo microdialysis study metabolitos de oxido nitrico no intersticio da medula espinhal lombo
2013Co-Authors: Jeová Nina Rocha, Gustavo BallejoAbstract:To determine the concentration of nitrate/nitrite in the cerebrospinal fluid and in the dorsal horn Interstice of the L6-S1 spinal cord boundary in rats with or without cystitis induced by cyclophosphamide. Methods: All experiments were conducted using Wistar female rats. A microdialysis probe was implanted in the subarachnoid space or in the spinal cord tissue at the L6-S1 segments (confirmed histologically). Two days later, the microdialysis probe was perfused with artificial cerebrospinal fluid, containing or not NG- monomethyl-L-arginine. Samples were collected every 15 minutes and kept at -20oC. Nitrite/nitrate concentrations were determined by chemiluminescence. Results: In normal animals, the mean values of nitrite/nitrate concentrations in the first microdialysate sample of the cerebrospinal fluid and of the spinal cord Interstice were similar (482.5±90.2pmol/75µL, n=20, and 505.7±11.5pmol/75µL, n=6, respectively), whereas, in the samples from rats with cystitis, these values were significantly greater (955.5±66.3pmol/75µL, n=8, and 926.5±131.7pmol/75µL, n=11, respectively). In both groups, NG- monomethyl-L- arginine caused a significant reduction in the nitrite/ nitrate concentration. Interestingly, the maximal reduction of nitrite/ nitrate concentration caused by NG-monomethyl-L- arginine was no greater than 30% of the initial values. Conclusions: These results constitute the first demonstration that nitrite/nitrate concentrations in the cerebrospinal fluid and spinal cord Interstice are elevated between 20- and 22 hours after cyclophosphamide-induced cystitis, and indicate that cystitis is associated with changes in the production of nitric oxide in the spinal cord segments, where most primary bladder afferents end.
John Dimmick - One of the best experts on this subject based on the ideXlab platform.
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News in the Interstices: The niches of mobile media in space and time
New Media & Society, 2010Co-Authors: John Dimmick, John Christian Feaster, Gregory J. HoplamazianAbstract:The recent growth of mobile channels has provided steadily increasing opportunities for individuals to access news and other mass-mediated content. Media ecological perspectives argue that the introduction of such new technologies can shift the existing biases in prevailing social systems. According to one ecological perspective, the theory of the niche, when new media technologies are successfully introduced into a domain, displacement may occur unless some alteration is made to the resource base. Interstices are conceptualized as the gaps in the routines of media users between scheduled activities. Through the use of a diary method, participants logged access to news using a variety of communication technologies, including mobile channels. Results indicated that traditional media occupied traditional niches with little evidence of displacement, while mobile channels occupied a new niche: access in the Interstices.
Dezhong Shen - One of the best experts on this subject based on the ideXlab platform.
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Monolayer colloidal mask with tunable Interstice size for nanosphere lithography
Thin Solid Films, 2013Co-Authors: Chong Geng, Lu Zheng, Qingfeng Yan, Xiaoqing Wang, Guangqiu Shen, Dezhong ShenAbstract:Nanosphere lithography (NSL), which utilizes self-assembled monolayer colloidal crystal (MCC) as a mask to fabricate ordered nanostructures over large areas, is a high through-put and low-cost method. In this work, polystyrene (PS) MCC with tunable Interstice size is prepared by a combination of self-assembly of PS nanospheres at the air–water interface and chemical vapor deposition (CVD) of siloxane polymers. Water vapor around the MCC reacts with the silicon tetrachloride (SiCl4) steam introduced by nitrogen carrier gas to form siloxane polymers. Consequently, it induces the formation of a siloxane polymers layer coating on the surface of each PS sphere, which results in the shrinkage of the Interstice between neighboring PS spheres. In this way, the deformation of colloidal spheres during thermal annealing could be avoided. Accordingly, extra cracks arising from the constraint of spheres deformation on a rigid substrate are eliminated. Furthermore, the Interstice size of the colloidal mask can be precisely controlled by manipulating the CVD conditions. In addition, the colloidal mask could be transferred onto any kind of substrates including rigid, flexible, flat, or curved solid substrates after CVD coating. The method provides a facile approach to the fabrication of Interstice-size-tunable, high-quality colloidal masks for NSL application.
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thermal annealing of colloidal monolayer at the air water interface a facile approach to transferrable colloidal masks with tunable Interstice size for nanosphere lithography
Journal of Materials Chemistry, 2012Co-Authors: Chong Geng, Lu Zheng, Qingfeng Yan, Xiaoqing Wang, Tongbo Wei, Dezhong ShenAbstract:Here we demonstrate a facile approach to the fabrication of transferrable and high-quality latex colloidal masks with tunable Interstice size for nanosphere lithography (NSL). A polystyrene (PS) monolayer colloidal crystal (MCC) was first prepared via an air–water interface self-assembly method and subsequently transferred onto the surface of water in a hydrothermal reactor. Thermal annealing of the PS colloidal monolayer floating at the water surface under a temperature higher than the glass-transition temperature of polystyrene caused deformation of the PS spheres, leading to the shrinkage of the Interstice. By manipulating the diameter of the colloidal spheres and the thermal annealing process, flexible control in size, shape and spacing of the Interstice in a colloidal mask was achieved, which would facilitate the broad use of NSL to study the size-, shape-, and period-dependent optical, magnetic, electronic, and catalytic properties of nanoparticle arrays.
