Color Engineering of Silicon Nitride Surfaces to Characterize the Polydopamine Refractive Index

A simple methodology to generate polydopamine (PDA) surfaces featured with color due to thin-film interference phenomena is presented. It is based on depositing ultra-thin films of polydopamine on a Si/Si 3 N 4 wafer that exhibits an interferential reflectance maximum right at the visible/UV boundary (∼400 nm). Therefore, a small deposit of PDA modifies the optical path, in such manner that the wavelength of the maximum of reflectance red shifts. Because the human eye is very sensitive to any change of the light spectral distribution at the visible region, very small film thickness changes (∼30 nm) are enough to notably modify the perceived color. Consequently, a controlled deposit of PDA, tune the color along the whole visible spectrum. Additionally, good quality of PDA deposits allowed us to determine the refractive index of polydopamine by ellipsometry spectroscopy. This data can be crucial in confocal skin microscopic techniques, presently used in diagnosis of skin tumors.Fil: Vega Moreno, Milena Amparo. Universidad de Salamanca; EspañaFil: Martín del Valle, Eva M.. Universidad de Salamanca; EspañaFil: Perez, Maximiliano Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Tecnológica Nacional. Facultad Regional Haedo; ArgentinaFil: Pecharromán, Carlos. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia de los Materiales de Barcelona; EspañaFil: Marcelo, Gema. Universidad de Salamanca; Españ

“Venericardia” patagonica é uma das espécies de bivalves mais comuns presentes no Oligoceno superior–Mioceno médio da Patagônia

‘Venericardia’ patagonica is one of the most common bivalve species represented in the late Oligocene–middle Miocene of Patagonia. Previous authors recognized two contrasting morphologies within this species based on sculpture and outline. An Elliptic Fourier Analysis was performed, using the anterior view of 95 specimens. A Principal Component Analysis was carried out with the Fourier coefficients. The results show two well differentiated groups, based on development of the convexity, each of which could correspond to the mature male and female, as is proposed for other carditids. The females have more bulky shells, with maximum convexity at the centre of valves. The males have less bulky shells, with a sharp ventral edge. These differences correlate with sculpture (more pronounced in males) and size of specimens (larger in females).Autores prévios reconheceram duas diferentes morfologias dentro dessa espécie a partir de sua ornamentação externa e contorno em vista lateral. Realizaram-se análises de morfometria geométrica, utilizando Contornos Elípticos de Fourier, capturando o contorno da vista anterior das valvas de 95 espécimes e de Componentes Principais dos Coeficientes de Fourier. Os resultados mostraram dois grupos bem diferenciados, baseados na convexidade das valvas, os quais corresponderiam a machos e fêmeas, como é proposto para outros carditídeos. As fêmeas teriam conchas mais volumosas, com sua convexidade máxima próxima ao centro das valvas, enquanto os machos possuem conchas menos abauladas, com a convexidade máxima próxima à margem ventral. Estas diferenças se correlacionam com outras na ornamentação externa (mais pronunciada nos machos) e no tamanho dos exemplares (maior nas fêmeas).Fil: Perez, Damián. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Alvarez, Maximiliano Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: del Río, Claudia Julia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin

Técnicas para superar la fobia social en los estudiantes del 3er año del bachillerato de una U. E. de Guayaquil

La Fobia Social en el Ecuador, llegó al extremo luego del confinamiento a causa de la pandemia. Las técnicas aplicadas para superar la fobia social en los estudiantes del tercer año de bachillerato en una unidad educativa de la ciudad de Guayaquil, se tomó como objetivo específico evaluar el nivel de Fobia Social tomando como método utilizado la investigación cuantitativa, con una población de 342 estudiantes oscilando en edades de 16 a 18 años y encuestando a 302 elementos. Como resultado de la exclusión de ciertos adolescentes que no quisieron participar de la encuesta por motivos personales, así mismo el diseño de la investigación es propositiva la cual pretendió analizar dos variables sobre la determinada población ya mencionada, obteniendo los resultados esperados en una forma para la implementación de técnicas de convivencia entre sus familiares y con la comunidad educativa, validando la propuesta en la superación de este problema social que se adaptó en los hogares de nuestros adolescentes. En conclusión, este fenómeno lleva a trabajar con los que padecen este problema dentro del campo médico para luego adaptarlos y guiarlos hacia un camino de seguridad y confianza social en el entorno educativo y familiar

Limitaciones a la libertad de testar, estudio comparado de la legislacion chilena a la luz de la normativa espanola de Galicia

59 p. La siguiente tesis no es autorizada por el autor para su difusión en formato digitalEn el siguiente estudio abordaremos el tema de la libertad para testar en nuestro país y también en la comunidad autónoma de Galicia, la cual durante el año 2006 modificó su Ley de Derecho Civil, introduciendo importantes reformas en el ámbito del Derecho Sucesorio. A lo largo de esta memoria, intentaremos acreditar la inexistencia de causales que justifiquen hoy en día la presencia de restricciones al momento de testar, ya que éstas fueron establecidas en atención al concepto de familia que se tenía en aquella época, concepto que no se condice con la realidad social actual. Para esto utilizaremos el método jurídico dogmático y el método comparativo para dar base y sustento al siguiente estudio y así confirmar la carencia de fundamentos que mantienen vigente normas que sólo se basan en consolidaciones históricas./ ABSTRACT: In the next research we will treat the subject of the freedom for make a will in our country and also in the autonomous community of Galicia, which during the year 2006 modified it Civil Law, introducing important reforms in the Inheritance Law area.Through this thesis, we will try to demonstrate that there are no reasons that justify nowadays the restrictions to making a will, because this restrictions were established in order to respect the family concept that existed on those days, concept that doesn`t apply in the current society. For that, we will use the dogmatic legal method and the comparative method, to give a base to the next research and confirm that there are no foundations that keep existing rules based on historical bindings

New dynamic microreactor system to mimic biofilm formation and test anti-biofilm activity of nanoparticles

Microbial bioflms are composed of surface-adhered microorganisms enclosed in extracellular polymeric substances. The bioflm lifestyle is the intrinsic drug resistance imparted to bacterial cells protected by the matrix. So far, conventional drug susceptibility tests for bioflm are reagent and time-consuming, and most of them are in static conditions. Rapid and easyto-use methods for bioflm formation and antibiotic activity testing need to be developed to accelerate the discovery of new antibioflm strategies. Herein, a Lab-On-Chip (LOC) device is presented that provides optimal microenvironmental conditions closely mimicking real-life clinical bioflm status. This new device allows homogeneous attachment and immobilization of Pseudomonas aeruginosa PA01-EGFP cells, and the bioflms grown can be monitored by fuorescence microscopy. P. aeruginosa is an opportunistic pathogen known as a model for drug screening bioflm studies. The infuence of fow rates on bioflms growth was analyzed by fow simulations using COMSOL® 5.2. Signifcant cell adhesion to the substrate and bioflm formation inside the microchannels were observed at higher fow rates>100 µL/h. After bioflm formation, the efectiveness of silver nanoparticles (SNP), chitosan nanoparticles (CNP), and a complex of chitosan-coated silver nanoparticles (CSNP) to eradicate the bioflm under a continuous fow was explored. The most signifcant loss of bioflm was seen with CSNP with a 65.5% decrease in average live/dead cell signal in bioflm compared to the negative controls. Our results demonstrate that this system is a user-friendly tool for antibioflm drug screening that could be simply applied in clinical laboratories.Fil: Bourguignon, Natalia. Universidad Tecnológica Nacional; Argentina. Florida International University; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Kamat, Vivek. Florida International University; Estados UnidosFil: Perez, Maximiliano. Universidad Tecnológica Nacional; Argentina. Florida International University; Estados UnidosFil: Mathee, Kalai. Florida International University; Estados UnidosFil: Lerner, Betiana. Universidad Tecnológica Nacional; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Florida International University; Estados UnidosFil: Bhansali, Shekhar. Florida International University; Estados Unido

Dietary patterns in human populations from northwest Patagonia during Holocene: an approach using Binford’s frames of reference and Bayesian isotope mixing models

The goal of this paper is to assess the variation in the proportional contribution of diverse resources to the diet of human populations from northwest Patagonia (Argentina) throughout the Middle-Late Holocene. Particularly, we assessed the variation among three geographic areas and two periods. We first estimated the expected proportions of terrestrial animals and plants and aquatic resources for each area according to the Binford’s frames of references approach. A Bayesian mixing method was then applied to calculate the proportion of plants and animals in the diets from stable isotopes (δ13C and δ15N) of human bone collagen. The isotope values suggest that the composition of diets differed spatially and temporally. Diets of South Mendoza were mainly composed of terrestrial animals (Rhea-Lama and rodents) with a greater incorporation of C3 plants towards the later Late Holocene; in North Neuquén, Rhea and Lama represent a proportion of 0.84 of the diet consumed; and finally, the sample of Center Neuquén is the only one with high values of Araucaria in the diet. The isotopic values obtained for the three studied areas did not fit to the expectations of Binford’s model, North Neuquén being the area that departs most from the predicted proportions of terrestrial animals and plants and aquatic organisms in the diet. These findings open up new questions about the local conditions that influenced regional variation in the diet of prehistoric hunter-gatherers.Fil: Gordón, Florencia. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Antropología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Perez, Sergio Ivan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Antropología; ArgentinaFil: Hajduk, Adam. Administración de Parques Nacionales. Museo de la Patagonia "Francisco Perito Moreno"; ArgentinaFil: Lezcano, Maximiliano Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio. Universidad Nacional de Río Negro. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio; ArgentinaFil: Bernal, Valeria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Antropología; Argentin

Naturalmente transhumanos

This work promotes the thesis that humans are naturally transhuman. In order to achieve this,we present in the first two sections some examples of technological devices assembled to human beings, and we critically review the assumptions and dichotomies on which the idea of human enhancement is based according to the ordinary transhumanist vision. Thirdly, we present the thesis of the Extended Mind to support our intuition. Fourthly, we dismantle the most relevant philosophical dichotomies that structure the transhumanist position. Finally, we recapitulate the reasons why we should wake up from the transhumanist dream.Fil: Pedace, Karina Silvia. Universidad de Buenos Aires; Argentina. Universidad Nacional de La Matanza; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Filosóficas. - Sociedad Argentina de Análisis Filosófico. Instituto de Investigaciones Filosóficas; ArgentinaFil: Balmaceda Huarte, Tomas. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Filosóficas. - Sociedad Argentina de Análisis Filosófico. Instituto de Investigaciones Filosóficas; ArgentinaFil: Lawler, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Filosóficas. - Sociedad Argentina de Análisis Filosófico. Instituto de Investigaciones Filosóficas; ArgentinaFil: Perez, Diana Ines. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Filosóficas. - Sociedad Argentina de Análisis Filosófico. Instituto de Investigaciones Filosóficas; ArgentinaFil: Zeller Echenique, Maximiliano. Universidad de Buenos Aires; Argentin

Factors Associated With Within-Herd Transmission of Serotype A Foot-and-Mouth Disease Virus in Cattle, During the 2001 Outbreak in Argentina: A Protective Effect of Vaccination

Argentina suffered an extensive foot-and-mouth disease (FMD) epidemic between July 2000 and January 2002, 3months after obtaining the official FMD-free without vaccination status conferred by the World Organization for Animal Health. This is one of the largest FMD epidemics controlled by implementation of a systematic mass vaccination campaign in an FMD-free country. In 2000, 124 herds were reported as FMD positive, 2394 herds in 2001 and one in January 2002; the total number of cattle herds in the country at that time was approximately 230000. Estimates of FMD transmission are important to understand the dynamics of disease spread and for estimating the value for the parameterization of disease transmission models, with the ultimate goals of predicting its spread, assessing and designing control strategies, conducting economic analyses and supporting the decision-making process. In this study, the within-herd coefficient of transmission, β, was computed for herds affected in the 2001 FMD epidemic and categorized as low or high based on the median value of β. A logistic regression model was fitted to identify factors significantly associated with high values of β. Results suggested that the odds of having a high within-herd transmission were significantly associated with time from initial herd infection to disease detection, date of report, vaccination, and time from initial herd infection to herd vaccination. Results presented in this study demonstrate, in quantifiable terms, the protective impact of vaccination in reducing FMD transmission in infected herds. These results will be useful for the parameterization of epidemiological models aimed at quantifying the impact of vaccination and for the design and implementation of FMD emergency vaccination strategies in face of an epidemic.Fil: Brito, B. P.. University of California at Davis; Estados Unidos. Universidad Nacional de Rosario; ArgentinaFil: Perez, Andres Maximiliano. University of California at Davis; Estados Unidos. Universidad Nacional de Rosario; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Cosentino, B.. Ministerio de Agricultura, Ganadería, Pesca y Alimento. Servicio Nacional de Sanidad y Calidad Agroalimentaria; ArgentinaFil: Rodriguez, L. L.. No especifíca;Fil: König, Guido Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación en Ciencias Veterinarias y Agronómicas. Instituto de Biotecnología; Argentin

Progressive violence and active non-violence: a possible dialogue between Sartre and Ricoeur

El objetivo del presente trabajo es abordar las posiciones de Jean Paul Sartre y de Paul Ricoeur en torno a la violencia y a las posibilidades e imposibilidades de su superación. Tomando en consideración sus puntos de convergencia y de divergencia nos abocaremos a indagar la indagación a la relación entre violencia e historia en ambos autores para luego exponer algunos puntos propios de la violencia progresista sartreana y de la no violencia activa propuesta por Ricoeur.The objective of this work is to address the positions of Jean Paul Sartre and Paul Ricoeur regarding violence and the possibilities and impossibilities of overcoming it. Taking into account their points of convergence and divergence, we will focus on the investigation of the relationship between violence and history in both authors, and then present some specific points of progressive Sartrean violence and of active nonviolence proposed by Ricoeur.Fil: Cladakis, Maximiliano Basilio. Universidad Nacional de San Martin. Escuela de Humanidades. Laboratorio de Investigacion En Ciencias Humanas. - Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Pque. Centenario. Laboratorio de Investigacion En Ciencias Humanas.; ArgentinaFil: Perez Ruiz, Edita Elizabeth. Universidad Nacional de San Martín; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin