ABSTRACT
This paper presents the concept of a novel adaptable sensing solution currently being developed under the EU Commission-founded PHOTONGATE project. This concept will allow for the quantification of multiple analytes of the same or different nature (chemicals, metals, bacteria, etc.) in a single test with levels of sensitivity and selectivity at/or over those offered by current solutions. PHOTONGATE relies on two core technologies: a biochemical technology (molecular gates), which will confer the specificity and, therefore, the capability to be adaptable to the analyte of interest, and which, combined with porous substrates, will increase the sensitivity, and a photonic technology based on localized surface plasmonic resonance (LSPR) structures that serve as transducers for light interaction. Both technologies are in the micron range, facilitating the integration of multiple sensors within a small area (mm2). The concept will be developed for its application in health diagnosis and food safety sectors. It is thought of as an easy-to-use modular concept, which will consist of the sensing module, mainly of a microfluidics cartridge that will house the photonic sensor, and a platform for fluidic handling, optical interrogation, and signal processing. The platform will include a new optical concept, which is fully European Union Made, avoiding optical fibers and expensive optical components.
Subject(s)
Metals , Surface Plasmon Resonance , Metals/chemistry , Optics and Photonics , Bacteria , Optical FibersABSTRACT
In this paper we present the development of photonic integrated circuit (PIC) biosensors for the label-free detection of six emerging and endemic swine viruses, namely: African Swine Fever Virus (ASFV), Classical Swine Fever Virus (CSFV), Porcine Reproductive and Respiratory Syndrome Virus (PPRSV), Porcine Parvovirus (PPV), Porcine Circovirus 2 (PCV2), and Swine Influenza Virus A (SIV). The optical biosensors are based on evanescent wave technology and, in particular, on Resonant Rings (RRs) fabricated in silicon nitride. The novel biosensors were packaged in an integrated sensing cartridge that included a microfluidic channel for buffer/sample delivery and an optical fiber array for the optical operation of the PICs. Antibodies were used as molecular recognition elements (MREs) and were selected based on western blotting and ELISA experiments to ensure the high sensitivity and specificity of the novel sensors. MREs were immobilized on RR surfaces to capture viral antigens. Antibody-antigen interactions were transduced via the RRs to a measurable resonant shift. Cell culture supernatants for all of the targeted viruses were used to validate the biosensors. Resonant shift responses were dose-dependent. The results were obtained within the framework of the SWINOSTICS project, contributing to cover the need of the novel diagnostic tools to tackle swine viral diseases.
Subject(s)
African Swine Fever Virus , Biosensing Techniques , Circovirus , Swine Diseases , Virus Diseases , Animals , SwineABSTRACT
In this paper we introduce a field diagnostic device based on the combination of advanced bio-sensing and photonics technologies, to tackle emerging and endemic viruses causing swine epidemics, and consequently significant economic damage in farms. The device is based on the use of microring resonators fabricated in silicon nitride with CMOS compatible techniques. In the paper, the designed and fabricated photonic integrated circuit (PIC) sensors are presented and characterized, showing an optimized performance in terms of optical losses (30 dB per ring) and extinction ration for ring resonances (15 dB). Furthermore, the results of an experiment for porcine circovirus 2 (PCV2) detection by using the developed biosensors are presented. Positive detection for different virus concentrations has been obtained. The device is currently under development in the framework of the EU Commission co-funded project SWINOSTICS.
Subject(s)
Biosensing Techniques/methods , Optics and Photonics , Swine Diseases/diagnosis , Swine Diseases/virology , Virus Diseases/diagnosis , Animals , Circovirus/isolation & purification , SwineABSTRACT
RESUMEN Introducción: los valores del hemograma en adultos pueden variar de acuerdo con factores como el origen étnico, la edad, el sexo y la altura sobre el nivel del mar, por lo cual es indispensable conocer intervalos biológicos asociados a nuestra población. Por esto el objetivo de nuestro estudio fue determinar intervalos biológicos de referencia (IBR) para adultos en un equipo hematológico BC-5000. Metodología: estudio descriptivo transversal con 111 donantes entre 18 y 62 años de un banco de sangre de Medellín. Se realizó un hemograma, proteína C reactiva y ferritina. Se calcularon los IBR siguiendo las recomendaciones de la Federación Internacional de Química Clínica. La comparación de los IBR según sexo se realizó con la prueba T-student. Resultados: los IBR calculados mediante la fórmula X ± (DS * 1,96) mostraron diferencias estadísticamente significativas entre hombres y mujeres para el recuento de la mayoría de los parámetros. Se obtuvieron medias estadísticas mayores en mujeres para el recuento de leucocitos y plaquetas, recuentos absolutos y relativos de algunas células blancas, volumen plaquetario medio (VPM) y plaquetocrito (PCT). Discusión: la presencia de andrógenos en el sexo masculino, inductores del sistema eritropoyético, así como los estrógenos y el período menstrual, supresores del mismo, pueden explicar los valores menores en el recuento eritrocitario, en los rangos de hemoglobina, hematocrito y glóbulos rojos en las mujeres. Las altas cargas de estrógenos e interleucinas 6 y 10 en las mujeres amplían la vida media de células como linfocitos, explicando la diferencia en el recuento leucocitario a expensas de linfocitos encontrados en el presente estudio.
SUMMARY Introduction: The adult hemogram values can vary according factors such as ethnic origin, age, sex and level above the sea, whereby it is essential to know the biological intervals associated to our own population. Therefore, the objective of our study was to determine biological reference intervals (BRI) for adults with the hematological equipment BC-5000. Methods: This is a transversal descriptive study with 111 blood bank donors from Medellín, between 18 62 years old. Hemogram, Creactive protein and ferritin were done. The BRI were calculated according to the recommendations of the International Federation of Clinical Chemistry (IFCC), with the formula X ± (DS * 1, 96). BRI comparison according sex was carried out with the t-student test. Results: Calculated BRI by X ± (DS * 1, 96) formula, showed statistically significant differences (P < 0, 05) between men and women for count in most of the parameters. Higher statistical means were obtain in women for the count of leukocytes and platelets, absolute counts of some white cells, VPN y PCT. Discussion: The presence of androgens in the male sex, inductors of the erythropoiesis system, as well as the estrogens and menstrual period, suppressor of this system, can explain the lower values in the female erythrocyte count, the hemoglobin, hematocrit and red cell lower ranges. The high estrogen and interleukins 6 and 1 loads in women, drive the extended half-life of some cells like lymphocytes, that can explain the difference in leucocyte count found in the present study.
Subject(s)
Humans , Hematology , Reference Values , Blood Donors , BiometryABSTRACT
In this paper, we present the concept of a novel diagnostic device for on-site analyses, based on the use of advanced bio-sensing and photonics technologies to tackle emerging and endemic viruses causing swine epidemics and significant economic damage in farms. The device is currently under development in the framework of the EU Commission co-funded project. The overall concept behind the project is to develop a method for an early and fast on field detection of selected swine viruses by non-specialized personnel. The technology is able to detect pathogens in different types of biological samples, such as oral fluids, faeces, blood or nasal swabs. The device will allow for an immediate on-site threat assessment. In this work, we present the overall concept of the device, its architecture with the technical requirements, and all the used innovative technologies that contribute to the advancements of the current state of the art.
Subject(s)
Diagnostic Equipment , Swine Diseases/diagnosis , Swine/virology , Virus Diseases/diagnosis , Animals , Biosensing Techniques , Reproducibility of ResultsABSTRACT
Se llevó a cabo una intervención comunitaria que incluyó a 50 madres de preescolares y escolares con riesgo de desnutrición, del Consejo Popular Vista Alegre, perteneciente al Policlínico Comunitario Armando García Aspurú de Santiago de Cuba, desde septiembre del 2005 hasta igual mes del 2006, con vista a modificar el nivel de conocimientos sobre algunos hábitos alimentarios. Se utilizó el porcentaje como medida de resumen, la prueba de Ji al cuadrado para la validación estadística y el test de Mc Nemar como medida de comparación. Se logró elevar considerablemente el conocimiento de las progenitoras sobre hábitos alimentarios para mejorar la evaluación nutricional en el grupo de niños estudiados(AU)
A community intervention was carried out that included 50 mothers of preschool and school children at risk of malnutrition, of the Vista Alegre People's Council, belonging to the Armando García Aspurú Community Polyclinic in Santiago de Cuba, from September, 2005 to September, 2006, aimed at modifying the level of knowledge on some dietary patterns. The percentage was used as summary measure, the X2 test for the statistical validation and the Mc Nemar test as comparison measure. It was possible to elevate the knowledge of the progenitors considerably on dietary patterns to improve the nutritional evaluation in the group of children studied(AU)
Subject(s)
Humans , Male , Female , Child, Preschool , Child , Child Nutrition Disorders , Nutrition Disorders , Nutrition AssessmentABSTRACT
Se llevó a cabo una intervención comunitaria que incluyó a 50 madres de preescolares y escolares con riesgo de desnutrición, del Consejo Popular Vista Alegre, perteneciente al Policlínico Comunitario Armando García Aspurú de Santiago de Cuba, desde septiembre del 2005 hasta igual mes del 2006, con vista a modificar el nivel de conocimientos sobre algunos hábitos alimentarios. Se utilizó el porcentaje como medida de resumen, la prueba de Ji al cuadrado para la validación estadística y el test de Mc Nemar como medida de comparación. Se logró elevar considerablemente el conocimiento de las progenitoras sobre hábitos alimentarios para mejorar la evaluación nutricional en el grupo de niños estudiados.
A community intervention was carried out that included 50 mothers of preschool and school children at risk of malnutrition, of the Vista Alegre People's Council, belonging to the Armando García Aspurú Community Polyclinic in Santiago de Cuba, from September, 2005 to September, 2006, aimed at modifying the level of knowledge on some dietary patterns. The percentage was used as summary measure, the X2 test for the statistical validation and the Mc Nemar test as comparison measure. It was possible to elevate the knowledge of the progenitors considerably on dietary patterns to improve the nutritional evaluation in the group of children studied(.
