684 research outputs found
El margen izquierdo oracional en español: cláusulas absolutas periféricas y predicados incidentales
Interacción de los antineoplásicos orales con los alimentos: revisión sistemática
[email protected]ón: Los estudios de biodisponibilidad son parte integrante del desarrollo clínico de medicamentos para administración oral con el fin de identificar potenciales interacciones fármaco-alimento (iFA). Actualmente, para los antineoplásicos orales se empieza a reconocer su importancia clínica, aun cuando lamentablemente, la información disponible presenta variabilidad en su evidencia científica.
Objetivos: Revisar la evidencia científica disponible sobre las interacciones de los alimentos con medicamentos antineoplásicos orales y establecer recomendaciones para su administración.
Métodos: Se realizó una búsqueda bibliográfica en Medline y The Cochrane Library para el periodo comprendido entre enero de 1966 a marzo de 2008, enfocada a identificar las publicaciones sobre interacciones fármaco alimento con antineoplásicos orales. El análisis bibliográfico consta de dos fases. En la primera fase se excluyeron los artículos que por título y contenido del resumen no se correspondían con el objetivo planteado; en la segunda fase se eliminaron las referencias duplicadas en ambas bases de datos.
Los criterios de inclusión para seleccionar los artículos fueron: diseño (revisiones sistemáticas, metaanálisis, ensayos clínicos randomizados Fase I y II), población (pacientes adultos; >19 años de edad), intervención evaluada (administración de antineoplásicos orales bajo condiciones de ayuno o con alimentos) y medida del resultado de la iFA (cálculo del IC90% de la razón entre la media geométrica de valores del área bajo la curva de concentraciones plasmáticas (ABC) o la concentración plasmática máxima (Cmax) con y sin alimentos). Se excluyeron las publicaciones que como medida de resultado no hacían referencia al dictamen de bioequivalencia establecido por la Food and Drugs Administration (FDA). La valoración crítica de los artículos seleccionados se realizó según las recomendaciones que de acuerdo con la FDA deben cumplir estos estudios.
Resultados: En la búsqueda inicial se obtuvieron 850 referencias (98,5% Medline + y 1,4% Cochrane). En la primera fase se excluyeron el 87,7% (746) de los artículos, correspondiendo el 100% a la búsqueda en Medline. En la segunda fase, quedaron 40 artículos (5,2% de los iniciales) para su lectura crítica a texto completo, a los que se añadieron cuatro más no indexados en Medline.
De la lectura crítica de los 44 artículos finales, se excluyeron 25 artículos (20 artículos originales, 4 comunicaciones cortas y 1 metanálisis) por no incluir como medida de resultado el dictamen de bioequivalencia. Los 19 (2,2%) artículos restantes proporcionaron información sobre 19 fármacos antineoplásicos orales, en 210 pacientes y 146 voluntarios sanos. De estos 19 fármacos, el 63% no presentan iFA o interacciones fármaco-alimento, pudiéndose administrar indistintamente con/sin alimentos; el 21% se deben administrar con alimentos y sólo el 16% presentan interacción fármaco alimento, por lo que se deben administrar sin alimentos.
Discusión: Actualmente, la importancia clínica de las interacciones fármaco alimento con antineoplásicos orales se identifica más directamente con la seguridad del paciente que con la efectividad del tratamiento.
Ante el desarrollo de estos agentes orales, su irrupción en la terapia oncológica desplazando a la terapia parenteral, con costes mensuales de miles de euros, hay necesidad de realizar estudios farmacocinéticos y farmacodinámicos bien diseñados. Su objetivo debe de ser comparar su biodisponibilidad en presencia o ausencia de alimentos con la respuesta clínica. Mientras tanto, establecer recomendaciones para su administración en relación con los alimentos, es inconsistente para algunos de estos fármacos y su resultado incierto por la falta de estudios fundamentados en el dictamen de bioequivalencia establecido por la FDA.Introduction: studies on bioavailability are part of the clinical development of drugs for oral use in order to identify potential drug-food interactions. For oral antitumor drugs, their clinical importance is currently recognized although regrettably the information available presents variability concerning the scientific evidence.
Objectives: To review the available scientific evidence about oral anti-tumor medications and establish the recommendations for their administration with foods.
Methods: We carried out a bibliographic search in Medline and The Cochrane Library for the period January of 1966 to March of 2008, focused on identifying those publications about drug-food interactions with oral antitumor medications. The bibliographical analysis was made in two steps. During the first phase, we excluded those articles in which the title or their content did not correspond with the objective settled; during the second phase, we deleted all the references duplicated in both databases.
The inclusion criteria to select the articles were: design (systematic reviews, meta-analysis, Phase I and Phase II randomized clinical trials), population (adult patients; >19 years of age), intervention evaluated (administration of oral anti-tumor drugs under fasting conditions or with food) and measurement of the iFA results (calculation of the 90% CI of the odds ratio between the geometric mean of the values under the curve of the plasma concentrations (ABC) or the maximal plasma concentration (Cmax) with and without foods). We excluded those publications that did not make reference to the bioequivalence dictamen established by the Food and Drugs Administration (FDA) in their outcomes measurement. A critical appraisal of the selected articles was done according to the recommendations that the FDA established to be met by these studies.
Results: At the initial search we obtained 850 references (98.5% Medline + and 1.4% Cochrane). During the first phase, we excluded 87.7% (746) of the articles, 100% of them corresponding to the search in Medline. During the second phase, 40 studies remained (5.2% of the initial ones) for full-text critical appraisal, to which four studies were added not indexed in Medline.
From the critical appraisal of the 44 final articles, 25 were excluded (20 original articles, 4 short communications, and 1 meta-analysis) because they did not include as an outcome measure the bioequivalence dictamen. The 19 (2.2%) remaining articles provided information on 19 oral anti-tumor drugs in 210 patients and 146 healthy volunteers. Of these 19 drugs, 63% did not present drugfood interactions, with the possibility of administering them either with or without food; 21% have to be administered with foods and only 16% present drug-food interactions, so they have to be administered without foods.
Discussion: Currently, the clinical importance of drugfood interactions with oral anti-tumor drugs is identified more directly with the patient's safety than with the efficacy of the therapy. Given the development of these oral agents, their incorporation into the oncologic strategy displacing parenteral therapy, with monthly costs of thousands of Euros, it is necessary to perform well-designed studies on pharmacokinetics and pharmacodynamics. Their goal has to be comparing their bioavailability in the presence or absence of foods with the clinical response. In the meanwhile, to establish recommendations for their administration in relation to foods is inconsistent for some of these drugs and their results is uncertain given the lack of studies based on the FDAbioequivalence dictamen
Development of a Map Viewer for Archipielago de Cabrera National Park, Balearic Islands, Spain
This chapter describes the development of a map viewer (accessible in Spanish at http://www
.ideo-cabrera.ieo.es) for the Archipelago de Cabrera National Park, Balearic Islands, Spain. The
park is a region with various forms of protection, demonstrating the importance of this area and the
need to expand knowledge about it and facilitate the management and monitoring of a wide range of
environmental threats and hazards. The development of the map viewer (leveraging ArcGIS Viewer
for Flex software) is one of the pioneering initiatives in Spain relating GIS technology to the marine
environment. It is the result of extensive interinstitutional collaboration between the EU-US Marine
Biodiversity research group of the Instituto Franklin-Universidad de Alcalá, the Instituto Español
de Oceanografía, and the Organismo Autónomo de Parques Nacionales. Keywords for this chapter
include GIS, web mapping, map viewer, Visor, metadata, WMS, INSPIRE, ArcGIS, Geoportal, Cabrera,
parque nacional, national park, Islas Baleares, Balearic Islands, España, Spain.Postprin
Electrochemical comparative study on corrosion behavior of conventional and powder metallurgy titanium alloys in physiological conditions
This article focuses on the electrochemical study of two titanium alloys employed in the manufacture of orthopedic implants – Ti-6Al-4V and Ti-6Al-7Nb – both of them obtained through powder metallurgy (PM). For comparative purposes, Ti-6Al-4V fabricated conventionally has also been investigated. Samples were immersed in a simulated body fluid (SBF) and incubated at 37 °C for different immersion time. Under these experimental conditions, we compared the influence of the processing method of alloys (PM or conventional) and their composition in the corrosion resistance. The corrosion resistance of these alloys in contact with SBF was evaluated with electrochemical impedance spectroscopy (EIS). The resulting impedance plots of all of them showed good reproducibility. For the lowest frequency tested (10 mHz) all of the samples showed high impedance modulus value approximately on the order of 106 Ω. This behavior is usually ascribed to a high corrosion protection performance. Although no significant differences in the evolution of the corrosion behavior for different immersion times has been found; the Ti-6Al-7Nb alloy processed by PM delivers a steady growth of corrosion resistance from day one until twelve weeks immersion. This sample showed the best performance between the two studied compositions. The resulting impedance plots show how powder metallurgy allows obtaining materials with similar or superior corrosion resistance in physiological conditions, than alloys obtained conventionally. Alloys characterization by scanning electron microscopy revealed no evidence of pitting corrosion phenomenon.Authors acknowledge funds provided by Spanish Government (programme MINECO, Ref. MAT2012-38650-C02-01) and regional government of Madrid (programme MULTIMAT-CHALLENGE, Ref. S2013/MIT-2862)
Querying phenotype-genotype relationships on patient datasets using semantic web technology: the example of cerebrotendinous xanthomatosis
Background: Semantic Web technology can considerably catalyze translational genetics and genomics research in medicine, where the interchange of information between basic research and clinical levels becomes crucial.
This exchange involves mapping abstract phenotype descriptions from research resources, such as knowledge databases and catalogs, to unstructured datasets produced through experimental methods and clinical practice.
This is especially true for the construction of mutation databases. This paper presents a way of harmonizing abstract phenotype descriptions with patient data from clinical practice, and querying this dataset about relationships between phenotypes and genetic variants, at different levels of abstraction.
Methods: Due to the current availability of ontological and terminological resources that have already reached some consensus in biomedicine, a reuse-based ontology engineering approach was followed. The proposed approach uses the Ontology Web Language (OWL) to represent the phenotype ontology and the patient model, the Semantic Web Rule Language (SWRL) to bridge the gap between phenotype descriptions and clinical data, and
the Semantic Query Web Rule Language (SQWRL) to query relevant phenotype-genotype bidirectional relationships.
The work tests the use of semantic web technology in the biomedical research domain named cerebrotendinous xanthomatosis (CTX), using a real dataset and ontologies.
Results: A framework to query relevant phenotype-genotype bidirectional relationships is provided. Phenotype descriptions and patient data were harmonized by defining 28 Horn-like rules in terms of the OWL concepts.
In total, 24 patterns of SWQRL queries were designed following the initial list of competency questions. As the approach is based on OWL, the semantic of the framework adapts the standard logical model of an open world assumption.
Conclusions: This work demonstrates how semantic web technologies can be used to support flexible representation and computational inference mechanisms required to query patient datasets at different levels of abstraction. The open world assumption is especially good for describing only partially known phenotype-genotype relationships, in a way that is easily extensible. In future, this type of approach could offer researchers a valuable resource to infer new data from patient data for statistical analysis in translational research. In conclusion, phenotype description formalization and mapping to clinical data are two key elements for interchanging knowledge between basic and clinical research.The work presented in this paper has been developed in the funded national project Gestión de Terminologías Médicas para Arquetipos (TIN2009-14159-C05-05) by the Ministerio de Educación y Ciencia. This work was partly supported by the network REGENPSI (2009/019) from the Program of Consolidation and Structure of Competitive Units, Consellería de Educación e Ordenación Universitaria, Xunta de Galicia, and by FEDER funds for regional development. PNR was supported by a grant from the Deutsche Forschungsgemeinschaft (DFGRO2005/4-2)S
Identificando las relaciones dimensionales de la escala de actitudes hacia las matemáticas propuesta por Auzmendi en maestros en formación
Diversas investigaciones señalan que las actitudes hacia contenidos o asignaturas de Matemáticas atienden a uno de los factores más influyentes en la futura labor docente de los maestros en formación. Por ello, consideramos que es necesario y de interés comparar las diferentes dimensiones que posee la actitud hacia las matemáticas entre los alumnos de Educación Primaria, debido a que en el grado que están estudiando deben adquirir tanto conocimientos de Matemáticas como la capacidad para impartirlos en su futuro empeño laboral
Well-defined alkylpalladium complexes with pyridine-carboxylate ligands as catalysts for the aerobic oxidation of alcohols
Neophylpalladium complexes of the type [Pd(CH(2)CMe(2)Ph)(N-O)(L)], where N-O is picolinate or a related bidentate, monoanionic ligand (6-methylpyridine-2-carboxylate, quinoline-2-carboxylate, 2-pyridylacetate or pyridine-2-sulfonate) and L is pyridine or a pyridine derivative, efficiently catalyze the oxidation of a range of aliphatic, benzylic and allylic alcohols with oxygen, without requiring any additives. A versatile method is described which allows the synthesis of the above-mentioned complexes with a minimum synthetic effort from readily available materials. Comparison of the rates of oxidation of 1-phenylethanol with different catalysts reveals the influence of the structure of the bidentate N-O chelate and the monodentate ligand L on the catalytic performance of these complexesGobierno de España CTQ2009-11721Junta de Andalucía FQM627
Marine GIS Applications: GIS Spanish Institute of Oceanography
Poster presentado en el SIEBM XVIII Simposio Ibérico de Biología MarinaSince 1998 in the IEO is developing a MARINE GIS with the objective of organize, harmonize,
standardize, integrated the geo-information of IEO. GIS tools are used in several projects carried out in the IEO related to study of living resources, natural resources, studies of evolution of natural phenomena,
collecting data, marine spatial planning, etc
Influence of a Concurrent Exercise Training Intervention during Pregnancy on Maternal and Arterial and Venous Cord Serum Cytokines: The GESTAFIT Project
The aim of the present study was to analyze the influence of a supervised concurrent exercise-training program, from the 17th gestational week until delivery, on cytokines in maternal (at 17th and 35th gestational week, and at delivery) and arterial and venous cord serum. Fifty-eight Caucasian pregnant women (age: 33.5 +/- 4.7 years old, body mass index: 23.6 +/- 4.1kg/m(2)) from the GESTAFIT Project (exercise (n = 37) and control (n = 21) groups) participated in this quasi-experimental study (per-protocol basis). The exercise group followed a 60-min 3 days/week concurrent (aerobic-resistance) exercise-training from the 17th gestational week to delivery. Maternal and arterial and venous cord serum cytokines (fractalkine, interleukin (IL)-1 beta, IL-6, IL-8, IL-10, interferon (IFN)-gamma, and tumor necrosis factor (TNF)-alpha) were assessed using Luminex xMAP technology. In maternal serum (after adjusting for the baseline values of cytokines), the exercise group decreased TNF-alpha (from baseline to 35th week, p = 0.02), and increased less IL-1 beta (from baseline to delivery, p = 0.03) concentrations than controls. When adjusting for other potential confounders, these differences became non-significant. In cord blood, the exercise group showed reduced arterial IL-6 and venous TNF-alpha (p = 0.03 and p = 0.001, respectively) and higher concentrations of arterial IL-1 beta (p = 0.03) compared to controls. The application of concurrent exercise-training programs could be a strategy to modulate immune responses in pregnant women and their fetuses. However, future research is needed to better understand the origin and clearance of these cytokines, their role in the maternal-placental-fetus crosstalk, and the influence of exercise interventions on them
Acoustic Holograms for Bilateral Blood-Brain Barrier Opening in a Mouse Model
[EN] Transcranial focused ultrasound (FUS) in conjunction with circulating microbubbles injection is the sole non-invasive technique that temporally and locally opens the blood-brain barrier (BBB), allowing targeted drug delivery into the central nervous system (CNS). However, single-element FUS technologies do not allow the simultaneous targeting of several brain structures with high-resolution, and multi-element devices are required to compensate the aberrations introduced by the skull. In this work, we present the first preclinical application of acoustic holograms to perform a bilateral BBB opening in two mirrored regions in mice. The system consisted of a single-element focused transducer working at 1.68 MHz, coupled to a 3D-printed acoustic hologram designed to produce two symmetric foci in anesthetized mice in vivo and, simultaneously, compensate the aberrations of the wavefront caused by the skull bones. T1-weighed MR images showed gadolinium extravasation at two symmetric quasi-spherical focal spots. By encoding time-reversed fields, holograms are capable of focusing acoustic energy with a resolution near the diffraction limit at multiple spots inside the skull of small preclinical animals. This work demonstrates the feasibility of hologram-assisted BBB opening for low-cost and highly-localized targeted drug delivery in the CNS in symmetric regions of separate hemispheres.This work was supported in part by the Spanish Ministry of Science, Innovation, and Universities (MICINN) through Grants "Juan de la Cierva -Incorporacion" IJC2018-037897-I, and PID2019-111436RB-C22, in part by the Agencia Valenciana de la Innovacio through Grants INNVAL10/19/016, INNCON/2021/8, and INNVA1/2020/92, in part by Generalitat Valenciana through Grants ACIF/2017/045, AICO/2020/268, and BEFPI/2019/075, and in part by the National Institutes of Health through Grants 5R01EB009041 and 5R01AG038961. Action co-financed by the European Union through the Programa Operativo del Fondo Europeo de Desarrollo Regional (FEDER) of the Comunitat Valenciana (IDIFEDER/2018/022 and IDIFEDER/2021/004)Jiménez-Gambín, S.; Jimenez, N.; Pouliopoulos, AN.; Benlloch Baviera, JM.; Konofagou, EE.; Camarena Femenia, F. (2022). Acoustic Holograms for Bilateral Blood-Brain Barrier Opening in a Mouse Model. IEEE Transactions on Biomedical Engineering. 69(4):1359-1368. https://doi.org/10.1109/TBME.2021.31155531359136869
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