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1.
An. acad. bras. ciênc ; 90(1,supl.1): 779-801, 2018. graf
Article in English | LILACS | ID: biblio-886939

ABSTRACT

Abstract The strong enhancement and localization of electromagnetic field in plasmonic systems have found applications in many areas, which include sensing and biosensing. In this paper, an overview will be provided of the use of plasmonic phenomena in sensors and biosensors with emphasis on two main topics. The first is related to possible ways to enhance the performance of sensors and biosensors based on surface plasmon resonance (SPR), where examples are given of functionalized magnetic nanoparticles, magnetoplasmonic effects and use of metamaterials for SPR sensing. The other topic is focused on surface-enhanced Raman scattering (SERS) for sensing, for which uniform, flexible, and reproducible SERS substrates have been produced. With such recent developments, there is the prospect of improving sensitivity and lowering the limit of detection in order to overcome the limitations inherent in ultrasensitive detection of chemical and biological analytes, especially at single molecule levels.

2.
Rev. méd. Córdoba ; 78: 11-5, ene.-dic. 1990.
Article in Spanish | LILACS | ID: lil-113096

ABSTRACT

Sobre 2580 intervenciones realizadas en el tracto biliar en el Hospital Córdoba, se observaron 8 casos de litiasis localizadas en vías biliares intrahepáticas. Se presentan dos casos y se analizan los signos para ser incluídos como primitivos por reunir algunas condiciones propias: diferencias morfológicas y estructurales entre los cálculos vesiculares y ductales; existencia de cisternas o aspecto moniliforme del hepático izquierdo; topografía segmentaria de los litos y concomitancia con patología estenótica en colédoco distal. La circunstancia de no mediar tiempo suficiente entre la colecistectomia y síntomas originados en la litiasis residual, no es tan valorada como la diferencia contextual de los cálculos. Se mencionan los buenos resultados obtenidos con la extracción instrumental incruenta de la litiasis intrahepática residual en casos graves, con sepsis e insuficiencia hepática en los que una inmediata relaparatomia no tendría perspectivas seguras para los pacientes


Subject(s)
Adult , Middle Aged , Male , Female , Biliary Tract , Cholelithiasis
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