Search results for "sers"
showing 10 items of 478 documents
Denaturing for Nanoarchitectonics: Local and Periodic UV-Laser Photodeactivation of Protein Biolayers to Create Functional Patterns for Biosensing
2022
[EN] The nanostructuration of biolayers has become a paradigm for exploiting nanoscopic light-matter phenomena for biosensing, among other biomedical purposes. In this work, we present a photopatterning method to create periodic structures of biomacromolecules based on a local and periodic mild denaturation of protein biolayers mediated by UV-laser irradiation. These nanostructures are constituted by a periodic modulation of the protein activity, so they are free of topographic and compositional changes along the pattern. Herein, we introduce the approach, explore the patterning parameters, characterize the resulting structures, and assess their overall homogeneity. This UV-based patterning…
Wavefront holoscopy: application of digital in-line holography for the inspection of engraved marks in progressive addition lenses
2014
Progressive addition lenses (PALs) are engraved with permanent marks at standardized locations in order to guarantee correct centering and alignment throughout the manufacturing and mounting processes. Out of the production line, engraved marks provide useful information about the PAL as well as act as locator marks to re-ink again the removable marks. Even though those marks should be visible by simple visual inspection with the naked eye, engraving marks are often faint and weak, obscured by scratches, and partially occluded and difficult to recognize on tinted or antireflection-coated lenses. Here, we present an extremely simple optical device (named as wavefront holoscope) for visualiza…
Core–Shell Nanorod Columnar Array Combined with Gold Nanoplate–Nanosphere Assemblies Enable Powerful In Situ SERS Detection of Bacteria
2016
Development of a label-free ultrasensitive nanosensor for detection of bacteria is presented. Sensitive assay for Gram-positive bacteria was achieved via electrostatic attraction-guided plasmonic bifacial superstructure/bacteria/columnar array assembled in one step. Dynamic optical hotspots were formed in the hybridized nanoassembly under wet-dry critical state amplifying efficiently the weak vibrational modes of three representative food-borne Gram-positive bacteria, that is, Staphylococcus xylosus, Listeria monocytogenes, and Enterococcus faecium. These three bacteria with highly analogous Raman spectra can be effectively differentiated through droplet wet-dry critical SERS approach combi…
¿Se benefician de los programas de intervención que no tratan específicamente el consumo de alcohol los maltratadores con problemas de consumo abusiv…
2013
En el ámbito de la intervención con maltratadores y de la investigación en torno a la mejora de la efectividad de estas intervenciones el consumo abusivo de alcohol ha sido uno de los factores de riesgo que ha recibido especial atención. El objetivo de este trabajo es analizar la relación entre el consumo abusivo de alcohol, el proceso de cambio debido a la intervención y el abandono prematuro. Para ello se utilizó una muestra de 86 hombres consumidores de riesgo y 80 hombres no consumidores de riesgo, todos ellos condenados por violencia contra la mujer en las relaciones de pareja y participando en un programa de intervención en medio comunitario que no trata específicamente el problema de…
¿Se benefician de los programas de intervención que no tratan específicamente el consumo de alcohol los maltratadores con problemas de consumo abusiv…
2013
ResumenEn el ámbito de la intervención con maltratadores y de la investigación en torno a la mejora de la efectividad de estas intervenciones el consumo abusivo de alcohol ha sido uno de los factores de riesgo que ha recibido especial atención. El objetivo de este trabajo es analizar la relación entre el consumo abusivo de alcohol, el proceso de cambio debido a la intervención y el abandono prematuro. Para ello se utilizó una muestra de 86 hombres consumidores de riesgo y 80 hombres no consumidores de riesgo, todos ellos condenados por violencia contra la mujer en las relaciones de pareja y participando en un programa de intervención en medio comunitario que no trata específicamente el prob…
Rings for privacy: An architecture for privacy-preserving user profiling
2014
Optical Soliton Molecules in Fiber Lasers
2006
Recent experiments demonstrate that fiber laser cavities are able to support various multisoliton complexes, analogous to soliton molecules, which could have impact on optical information transmission or storage. These advances are guided by the concept of dissipative soliton.
Metodologie da stampa a getto d'inchiostro per la fabbricazione di substrati SERS
2019
Uno degli argomenti di maggiore interesse della Surface-enhanced Raman spectroscopy (SERS) è il controllo del posizionamento su superficie degli “hot spots” – le zone interstiziali fra aggregati di particelle metalliche che producono un aumento locale del segnale Raman. I substrati SERS consistono tipicamente in una matrice di hot-spots ad alta densità sui quali volumi macroscopici (>1 µL) di molecole di analita sono disperse. Questo approccio porta ad una alta invasività ed una distribuzione non uniforme dell’analita a causa dei flussi capillari. In questo lavoro, viene sviluppata una nuova piattaforma SERS realizzata da stampa a getto d’inchiostro2 in cui una miscela di un analita SERS…
The role of trust in enhancing Internet use in a high-risk society
2015
Purpose – This paper aims to determine the key trust antecedents that influence Internet users’ trust level toward Internet service providers (ISPs) in a high-risk society. It also investigates trust-building process, major causes of its violation, their potential implications and restoration. Design/methodology/approach – A mixed-method approach was used in collecting data in Kenya in 2014 by using questionnaire and interview techniques. The former was administered to 250 (with 81 per cent response rate) randomly selected Internet users at Kenyatta University while the latter focused on key decision-makers from four randomly selected ISPs in Nairobi. Findings – The results show that Inter…