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Search Results: 1 - 10 of 6235 matches for " Gerard Ferrer Esteban "
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Segregació social i marc institucional del scentres: una anàlisi internacional de les desigualtats educatives Social segregation and the institutional framework of the school: an Segregación social y marco institucional de los centros: un análisis
Gerard Ferrer Esteban,Miquel àngel Alegre Canosa
Temps d'Educació , 2009,
Abstract: L’objectiu del present article és l’anàlisi comparativa, en l’àmbit internacional, dels efectes dels factors de procés i de composició escolar en les desigualtats de resultats entre els estudiants. Aquesta anàlisi es du a terme mitjan ant models de regressió multinivell que permeten identificar factors que contribueixen a explicar la variabilitat del rendiment acadèmic dels estudiants i que, per tant, donen orientacions per assenyalar causes de les situacions de desigualtat en els sistemes educatius. L’anàlisi comprèn dades de 32 sistemes educatius de l’OCDE, 23 corresponents a unitats nacionals i nou a realitats subnacionals. La font principal d’informació utilitzada per a la construcció de les variables és la base de dades PISA2006. Els resultats de l’anàlisi corroboren l’efecte significatiu de la composició social dels centres. La significació d’aquests factors no presenten variacions importants quan es controlen les variables relatives al marc institucional i als processos pedagògics. D’altra banda, si bé els factors de procés escolar mostren un impacte comparativament menor sobre les puntuacions, aquells que més contribueixen a explicar les disparitats de resultats entre els centres escolars corresponen a pràctiques que segueixen, en certa mesura, principis de quasi-mercat. ___________________________________ L’objectif du présent article est l’analyse comparative, à niveau international, des effets des facteurs de processus et de composition scolaire dans les inégalités de résultats entre les étudiants. Cette analyse est menée à terme grace à des modèles de régression multi-niveaux qui permettent d’identifier les facteurs qui contribuent à expliquer la variabilité du rendement académique des étudiants et qui donnent, par conséquent, des orientations pour signaler les causes des situations d’inégalité dans les systèmes éducatifs. L’analyse comprend des données de trente-deux systèmes éducatifs de l’OCDE (23 sont unités nationales et 9, réalités sub-nationales). La source principale d’information utilisée pour la construction des variables est PISA 2006. Les résultats corroborent l’effet significatif de la composition sociale des centres. La signification de ces facteurs ne présente pas de variations importantes quand on contr le les variables relatives au cadre institutionnel et aux processus pédagogiques. D’autre part, si les facteurs de processus scolaire montrent un impact comparativement moindre sur les ponctuations, ceux qui contribuent le plus à expliquer les disparités de résultats entre les centres scolaires correspondent à des pratiques qui
Tratamiento de la obstrucción del conducto lacrimal con el stent Tear-Leader
Ferrer,D.; Esteban,E.; Aparisi,P.; Cosín,O.;
Archivos de la Sociedad Espa?ola de Oftalmología , 2009, DOI: 10.4321/S0365-66912009001000006
Abstract: purpose: to compare the effectiveness and patency of the tearleader stent (pbn) for treatment of lacrimal system obstruction. methods: a prospective study of 68 patients referred from the ophthalmology department with suspicion of lacrimal system obstruction. we placed 74 tearleader pbn stents. inclusion criteria were: complete obstruction of lacrimal duct with canalicula and lacrimal puncta patency, and absence of acute infection. we studied the clinical improvement by means of an opinion survey, and the patency of stents was evaluated with kaplan-meier survival curves. results: follow-up of patients was two years. a painful procedure was reported in 10% of cases. minor dacryocystitis appeared in 18.9% of cases, while complete resolution of epiphora was confirmed in 77% of cases (23% of cases showed grade i epiphora). patency of stents: median patency 490 days (15 months), range 11 to 730 days; 1 year after stent placement patency was 0.51 and long term patency rate for 2 years was 0.31. opinion survey of the 68 patients: satisfaction with the technique, the procedure and prosthesis placement was 41%; satisfaction whilst the stent remained patent was 60.8%. conclusion: tearleader stent placement is easy to perform and comfortable for patients. tearleader placement gave a patency outcome similar to other stents.
Tratamiento de la obstrucción del conducto lacrimal con el stent Tear-Leader Treatment of lacrimal duct obstruction with a Tear-Leader stent
D. Ferrer,E. Esteban,P. Aparisi,O. Cosín
Archivos de la Sociedad Espa?ola de Oftalmología , 2009,
Abstract: Objetivo: Describir los resultados clínicos y estudiar la permeabilidad del stent de Tear-Leader (PBN) en el tratamiento de la obstrucción del conducto lacrimal. Método: Estudio prospectivo de 68 pacientes, remitidos desde el Servicio de Oftalmología para estudio de epífora por sospecha de obstrucción del conducto lacrimal. Hemos colocado un total de 74 stents Tear-Leader. Los criterios de inclusión fueron: obstrucción completa del conducto lacrimal con permeabilidad de canalículos y de puntos lacrimales así como ausencia de infección aguda. Hemos realizado en todos los pacientes el control clínico y una encuesta de satisfacción. Se realizó un estudio estadístico descriptivo y se evaluó la permeabilidad de la prótesis usando las curvas de Kaplan Meier. Resultados: El seguimiento de los pacientes se realizó durante dos a os. Se confirmó la resolución total de la epífora en el 77%, (en el 23% persistió una epífora grado I). Permeabilidad del stent: la mediana fue de 490 días (15 meses) con rango de 11-730 días, al a o la permeabilidad fue de 0,51 y a 2 a os de 0,31. Refieren implantación dolorosa el 10% de los casos implantados. Aparecieron episodios de dacriocistitis leve en el 18% de los casos. Encuesta de satisfacción a los 68 pacientes: con respecto a la técnica, procedimiento y prótesis estaban satisfechos un 41%. Mientras la prótesis se mantuvo permeable se encontraban satisfechos un 60,8%. Conclusión: La prótesis Tear-Leader es de fácil colocación, con escasas molestias para el paciente. Presenta una permeabilidad similar al resto de stents del mercado. Purpose: To compare the effectiveness and patency of the TearLeader stent (PBN) for treatment of lacrimal system obstruction. Methods: A prospective study of 68 patients referred from the ophthalmology department with suspicion of lacrimal system obstruction. We placed 74 TearLeader PBN stents. Inclusion criteria were: complete obstruction of lacrimal duct with canalicula and lacrimal puncta patency, and absence of acute infection. We studied the clinical improvement by means of an opinion survey, and the patency of stents was evaluated with Kaplan-Meier survival curves. Results: Follow-up of patients was two years. A painful procedure was reported in 10% of cases. Minor dacryocystitis appeared in 18.9% of cases, while complete resolution of epiphora was confirmed in 77% of cases (23% of cases showed grade I epiphora). Patency of stents: median patency 490 days (15 months), range 11 to 730 days; 1 year after stent placement patency was 0.51 and long term patency rate for 2 years was 0.31. Opinion su
A correction on Shiloach's algorithm for minimum linear arrangement of trees
Juan Luis Esteban,Ramon Ferrer-i-Cancho
Computer Science , 2015,
Abstract: More than 30 years ago, Shiloach published an algorithm to solve the minimum linear arrangement problem for undirected trees. Here we fix a small error in the original version of the algorithm.
The complete chloroplast genome sequence of Brachypodium distachyon: sequence comparison and phylogenetic analysis of eight grass plastomes
Esteban Bortiri, Devin Coleman-Derr, Gerard R Lazo, Olin D Anderson, Yong Q Gu
BMC Research Notes , 2008, DOI: 10.1186/1756-0500-1-61
Abstract: The chloroplast genome of Brachypodium distachyon was sequenced by a combinational approach using BAC end and shotgun sequences derived from a selected BAC containing the entire chloroplast genome. Comparative analysis indicated that the chloroplast genome is conserved in gene number and organization with respect to those of other cereals. However, several Brachypodium genes evolve at a faster rate than those in other grasses. Sequence analysis reveals that rice and wheat have a ~2.1 kb deletion in their plastid genomes and this deletion must have occurred independently in both species.We demonstrate that BAC libraries can be used to sequence plastid, and likely other organellar, genomes. As expected, the Brachypodium chloroplast genome is very similar to those of other sequenced grasses. The phylogenetic analyses and the pattern of insertions and deletions in the chloroplast genome confirmed that Brachypodium is a close relative of the tribe Triticeae. Nevertheless, we show that some large indels can arise multiple times and may confound phylogenetic reconstruction.Plastids are key organelles of green plants, carrying out functions like photosynthesis, starch storage, nitrogen and sulfate metabolism, and synthesis of chlorophyll, carotenoids, fatty acids and nucleic acids [1]. Plastids have multiple copies of a circular, double-stranded DNA chromosome, each with a set of approximately 110 genes highly conserved in sequence and organization [2].In addition to their important biological roles, plastids have the potential to make a big impact on biotechnology. Plastid transformation, achieved via homologous recombination, is very advantageous compared to nuclear genome transformation mainly because it can generate high levels of gene expression and the recombinant DNA is more easily contained since chloroplasts are maternally inherited in most species of angiosperms [3].The family Poaceae, with approximately 10,000 species, contains the world's most important crops. T
Determinantes sociales de los patrones dietéticos durante el embarazo
Ferrer,Carlos; García-Esteban,Raquel; Mendez,Michelle; Romieu,Isabelle; Torrent,Matias; Sunyer,Jordi;
Gaceta Sanitaria , 2009, DOI: 10.1590/S0213-91112009000100008
Abstract: objectives: to identify dietary patterns in pregnancy and describe their relationship with sociodemographic factors, smoking, and body mass index. as a secondary objective, intakes were evaluated relative to current dietary recommendations for pregnant women. methods: cross-sectional assessment of dietary intakes in 473 pregnant women from the island of menorca (spain) was performed. dietary patterns were identified using a principal components analysis, and dietary quality was assessed by comparing food group intakes with recommended intakes in pregnancy. results: two dietary patterns were identified, one characterized by high intakes of energy-dense foods and low intakes of fruits and vegetables (?caloric?), and the other by high intakes of vegetables, legumes, fish, meat, rice and pasta (?healthy?). scores for the caloric pattern were higher in immigrants, smokers, parous women and women with only primary school education (p<0,05). scores for the healthy pattern were higher in women originally from other parts of spain and immigrants (p<0,05). no associations were found with the remaining variables. adherence to dietary recommendations was high for fruit, meat and especially dairy products, while intakes of vegetables, cereals and legumes were only one-third of recommended levels. conclusions: dietary patterns during pregnancy were similar to previously reported patterns in the general population, showing consistent associations with sociodemographic factors and smoking. there were substantial deficiencies in intakes of cereals, legumes and vegetables in all women, suggesting the need for educational interventions and monitoring during prenatal care to improve the quality of dietary habits during pregnancy.
Evidencia de la alimentación enteral precoz en la cirugía colorrectal Evidence of early oral feeding in colorectal surgery
F. Villalba Ferrer,M. Bruna Esteban,M. J. García Coret,J. García Romero
Revista Espa?ola de Enfermedades Digestivas , 2007,
Abstract: Existe mucha variabilidad en el inicio de la alimentación enteral en los pacientes intervenidos de cirugía colorrectal, incluso en muchas ocasiones estos pacientes se mantienen con sonda nasogástrica en el postoperatorio, con el supuesto de prevenir complicaciones como la dehiscencia, evisceración o eventración. Realizamos una revisión de la evidencia clínica sobre el empleo de sonda nasogástrica y alimentación precoz consultando las bases del PubMed, Embase y la Cochrane. Encontramos evidencia Ia, Ib a partir de meta-análisis y estudios randomizados prospectivos donde se desaconseja el uso sistemático de la sonda de descompresión gástrica y se recomienda el inicio de una alimentación precoz en la cirugía colorrectal. La dieta absoluta no aporta ningún beneficio después de una cirugía gastrointestinal y con la sonda nasogástrica no disminuyen las complicaciones postoperatorias. Sin embargo, una cirugía menos invasiva y los avances en la anestesia y analgesia contribuyen a reducir el íleo postoperatorio. There is much variability regarding time to start of enteral nutrition in patients undergoing colorectal surgery. In many instances such patients are postoperatively maintained with nasogastric intubation with the aim of preventing complications such as dehiscence, evisceration or eventration. We examine the clinical evidence regarding nasogastric tube placement and early feeding with reference to the PubMed, Embase, and Cochrane databases. Ia and Ib evidence was obtained from meta-analyses and prospective randomized studies, where the systematic use of a gastric decompression catheter is advised against and initiation of early feeding for colorectal surgery is recommended. Fasting does not provide any benefit after gastrointestinal surgery, and the use of nasogastric tubes does not decrease postoperative complications. However, less invasive surgery and new advances in anesthesia and analgesia are contributing to a reduction in postoperative ileus.
Classifying Groups of Small Order  [PDF]
Gerard Thompson
Advances in Pure Mathematics (APM) , 2016, DOI: 10.4236/apm.2016.62007
Abstract: The classification of groups of order less than 16 is reconsidered. The goal of the paper is partly historical and partly pedagogical and aims to achieve the classification as simply as possible in a way which can be easily incorporated into a first course in abstract algebra and without appealing to the Sylow Theorems. The paper concludes with some exercises for students.
Maternal intelligence-mental health and child neuropsychological development at age 14 months
Forns,Joan; Julvez,Jordi; García-Esteban,Raquel; Guxens,Mònica; Ferrer,Muriel; Grellier,James; Vrijheid,Martine; Sunyer,Jordi;
Gaceta Sanitaria , 2012, DOI: 10.1016/j.gaceta.2011.10.011
Abstract: objective: to examine the relationship between maternal intelligence-mental health and neuropsychological development at age 14 months in a normal population, taking into account maternal occupational social class and education. methods: we prospectively studied a population-based birth cohort, which forms part of the inma (environment and childhood) project. cognitive and psychomotor development was assessed at 14 months using bayley scales of infant development. maternal intelligence and mental health were assessed by the cattell and cattell test and the general health questionnaire-12 respectively. results: we observed a crude association between maternal intelligence and cognitive development in children at 14 months but this association disappeared when maternal education was included. the associations were stratified by maternal education and occupational social class. within the manual maternal occupational social class, there was a significant difference in cognitive development between children whose mothers scored in the highest tertile of maternal iq and those whose mothers scored in the lowest tertile. in contrast, no differences were observed among children whose mothers were in the non-manual occupational social class. conclusions: the association between maternal intelligence and child cognitive development differed by occupational social class. while this association was not confounded by education or other variables in manual occupational social classes, maternal education explained this association among advantaged occupational social classes.
Evidencia de la alimentación enteral precoz en la cirugía colorrectal
Villalba Ferrer,F.; Bruna Esteban,M.; García Coret,M. J.; García Romero,J.; Roig Vila,J. V.;
Revista Espa?ola de Enfermedades Digestivas , 2007, DOI: 10.4321/S1130-01082007001200006
Abstract: there is much variability regarding time to start of enteral nutrition in patients undergoing colorectal surgery. in many instances such patients are postoperatively maintained with nasogastric intubation with the aim of preventing complications such as dehiscence, evisceration or eventration. we examine the clinical evidence regarding nasogastric tube placement and early feeding with reference to the pubmed, embase, and cochrane databases. ia and ib evidence was obtained from meta-analyses and prospective randomized studies, where the systematic use of a gastric decompression catheter is advised against and initiation of early feeding for colorectal surgery is recommended. fasting does not provide any benefit after gastrointestinal surgery, and the use of nasogastric tubes does not decrease postoperative complications. however, less invasive surgery and new advances in anesthesia and analgesia are contributing to a reduction in postoperative ileus.
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