Estrategia didáctica para favorecer la formación y el desarrollo de la competencia para gestionar el conocimiento matemático en los estudiantes universitarios

Nota: Artículo derivado de tesis doctoral de igual título aprobada en mayo de 2009.La investigación tuvo como objeto el proceso docente-educativo de la matemática en la carrera de Ingeniería en Sistemas de Computación de la Universidad APEC (UNAPEC). Estuvo orientada al diseño de una estrategia didáctica para favorecer la formación y el desarrollo de la competencia para gestionar el conocimiento matemático en los estudiantes, la que se sustenta en un modelo teórico que se explica a partir de tres subsistemas que permiten develar las relaciones que se dan en el proceso de formación y desarrollo de la competencia declarada en el contexto del proceso docente-educativo (PDE) de la matemática. Para determinar la factibilidad y pertinencia se realizó la ejemplificación y valoración de la estrategia didáctica a través del método de expertos, y la constatación empírica a través de un pre-experimento pedagógico. La novedad científica está dada al develar las relaciones existentes entre los subsistemas que componen el modelo y expresan la concepción de la competencia para gestionar el conocimiento matemático

The restitution of an oxalate-damaged epithelium

The renal inner medulla is responsible for the hydro-saline equilibrium maintenance through water and electrolyte excretionin urine. The collecting ducts, which are involved in the urine concentration, are immersed in an extracellular matrix with thehighest body osmolarity. The hyperosmolarity is a key signal for cell differentiation and for the establishment of the urineconcentration mechanism. Moreover, renal ducts are exposed to wastes coming from blood filtration. There are severalnephrotoxic agents such as antibiotics, diuretics, antineoplastic and cytostatic agents, and renal stones. Calcium oxalate stonesare the most common type of kidney stone. The crystal aggregates are harmful for epithelial renal cells and tubular structures,and that damage could lead to the development of chronic kidney disease. Our previous results showed that differentiated renalcells treated with oxalate (Ox) for 24 h lost the typical epithelial cobblestone morphology and showed a spindle-shapedmorphology characteristic of an epithelial mesenchymal transition. After 48 h of Ox, cells started to recover their morphologyand after 72 h of Ox the epithelium was almost reestablished. The aims of the present work were to evaluate whether epithelialintegrity is disrupted after 24 h of Ox and whether epithelial differentiated characteristics are restituted after 72 h of Ox. Todo that, the renal epithelial cells MDCK were grown in a hyperosmolar environment (512 mOsm/Kg H2O) for 72 h to get adifferentiated epithelium, and then subjected to 1.5 mM Ox for 24, 48 and 72 h. After treatments, cell morphology and theexpression of differentiated epithelia markers were evaluated by fluorescence microscopy. E-cadherin, a member of adherensjunctions, was localized to the cell periphery at 24, 48 and 72 h in control conditions. After 24 h of Ox, the protein wasinternalized and its label on the periphery decreased. After 48 h of Ox, E-cadherin was localized both to the cell membranesand to the cytoplasm, while after 72 h of Ox the label was mainly at the cell periphery. In control cells the apical marker gp135was localized at apical cell surface, while in cells treated with 24 h of Ox gp135 apical staining was reduced. After 48 h of Ox,the percentage of cells expressing apical gp135 started to increase reaching values like control conditions at 72 h. Finally,primary cilium was evidenced by acetylated-tubulin immunofluorescence. Control cells showed a high percentage of ciliatedcells, while it decreased upon treatment with 24 h of Ox. After 48 h of Ox, the cells started to recover the primary cilium, andafter 72 h of Ox, the percentage of ciliated cells reached control values. The results showed that the treatment with 24 h of Oxinduces dedifferentiation and after 72 h of the cell damage there is a restitution of the differentiated epithelia. The next goal isto elucidate the molecular mechanisms involved in the restitution of the oxalate-damaged epithelium.Fil: Sendyk, Dylan. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Ciencias Biológicas. Cátedra de Biología Celular y Molecular; ArgentinaFil: Pescio, Lucila Gisele. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Físico-Química Biológicas "Prof. Alejandro C. Paladini". Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Físico-Química Biológicas; Argentina. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Ciencias Biológicas. Cátedra de Biología Celular y Molecular; ArgentinaFil: Fernández Tomé, M. C.. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Físico-Química Biológicas "Prof. Alejandro C. Paladini". Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Físico-Química Biológicas; Argentina. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Ciencias Biológicas. Cátedra de Biología Celular y Molecular; ArgentinaFil: Casali, Cecilia Irene. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Ciencias Biológicas. Cátedra de Biología Celular y Molecular; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Físico-Química Biológicas "Prof. Alejandro C. Paladini". Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Físico-Química Biológicas; ArgentinaLVII Annual Meeting of the Argentine Society for Biochemistry and Molecular Biology Research and XVI Annual Meeting of the Argentinean Society for General MicrobiologyVirtualArgentinaSociedad Argentina de Investigación Bioquímica y Biología MolecularAsociación Civil de Microbiología Genera

Signal sequence analysis of expressed sequence tags from the nematode Nippostrongylus brasiliensis and the evolution of secreted proteins in parasites

BACKGROUND: Parasitism is a highly successful mode of life and one that requires suites of gene adaptations to permit survival within a potentially hostile host. Among such adaptations is the secretion of proteins capable of modifying or manipulating the host environment. Nippostrongylus brasiliensis is a well-studied model nematode parasite of rodents, which secretes products known to modulate host immunity. RESULTS: Taking a genomic approach to characterize potential secreted products, we analyzed expressed sequence tag (EST) sequences for putative amino-terminal secretory signals. We sequenced ESTs from a cDNA library constructed by oligo-capping to select full-length cDNAs, as well as from conventional cDNA libraries. SignalP analysis was applied to predicted open reading frames, to identify potential signal peptides and anchors. Among 1,234 ESTs, 197 (~16%) contain predicted 5' signal sequences, with 176 classified as conventional signal peptides and 21 as signal anchors. ESTs cluster into 742 distinct genes, of which 135 (18%) bear predicted signal-sequence coding regions. Comparisons of clusters with homologs from Caenorhabditis elegans and more distantly related organisms reveal that the majority (65% at P < e(-10)) of signal peptide-bearing sequences from N. brasiliensis show no similarity to previously reported genes, and less than 10% align to conserved genes recorded outside the phylum Nematoda. Of all novel sequences identified, 32% contained predicted signal peptides, whereas this was the case for only 3.4% of conserved genes with sequence homologies beyond the Nematoda. CONCLUSIONS: These results indicate that secreted proteins may be undergoing accelerated evolution, either because of relaxed functional constraints, or in response to stronger selective pressure from host immunity

Gigantism: microsurgical treatment by transsphenoidal approach and prognostic factors

Purpose: We present the results of transsphenoidal microsurgical treatment in 14 patients with gigantism. The influence on the prognosis of factors such as the tumor size and preoperative levels of GH and IGF-1 is also quantified. Materials and methods: The patients, operated between 1982 and 2004, were reviewed retrospectively in June 2022. All patients had complete endocrinological studies in the preoperative period and a postoperative control between 6 days and 3 weeks. Follow-up has been supported with annual check-ups between 3 and 31 years. We have compared the preoperative levels of GH and IGF-1 of these patients with the levels of a series of acromegalic patients operated on in the same Center. Results: In this series there were 4 women and 10 men. The age ranged between 14 and 21 years. In 6 patients, postoperative hormone levels achieved the disease control criteria (42.8%). The CT/MRI studies revealed the existence of invasive tumors in 10 of the patients (71.4%). Postoperative CT/MRI showed no tumor tissue in 3 patients but in 7 patients there were tumor remains. The remaining 4 patients had abnormal images although not considered as tumor. A statistical comparison of preoperative serum GH and IGF-1 levels in patients with gigantism and patients with acromegaly showed a significant elevation in the former. Conclusion: Pituitary adenomas that cause gigantism are generally large and invasive, which makes them difficult to cure. High preoperative levels of GH and IGF-1 are also factors that decrease remission

The validity and reliability of a novel app for the measurement of change of direction performance

The aim of the present investigation was to analyze the validity and reliability of a novel iPhone app (CODTimer) for the measurement of total time and interlimb asymmetry in the 5 + 5 change of direction test (COD). To do so, twenty physically active adolescent athletes (age = 13.85 ± 1.34 years) performed six repetitions in the COD test while being measured with a pair of timing gates and CODTimer. A total of 120 COD times measured both with the timing gates and the app were then compared for validity and reliability purposes. There was an almost perfect correlation between the timing gates and the CODTimer app for the measurement of total time (r = 0.964; 95% Confidence interval (CI) = 0.95-1.00; Standard error of the estimate = 0.03 s.; p  0.05). Similar levels of reliability were observed between the timing gates and the app for the measurement of the 6 different trials of each participant (Timing gates: Intraclass correlation coefficient (ICC) = 0.651-0.747, Coefficient of variation (CV) = 2.6-3.5%; CODTimer: ICC = 0.671-0.840, CV = 2.2-3.2%). The results of the present study show that change of direction performance can be measured in a valid, reliable way using a novel iPhone app

Analysing bacterial communities from microbial mats and sediments located in the Atacama desert

The Atacama Desert has more than 100 basins with interior drainage and most of them contain salt flats. These ecosystemshave extreme environmental conditions that allow the development of unique microbial communities. The objetctive of this wasto study the bacterial diversity using independent culture tools of microbial mats and sediments from salt flats in the AtacamaDesert. Some physicochemical conditions of the water surrounding these samples were analysed to discover if anyphysicochemical characteristic could be influencing in its taxonomic composition. Five samples were collected, three of themwere microbial mats and two were sediments. The mat samples were taken from Laguna Llamara (samples named LL1 andLL2) and Laguna Cejar (Cej). Sediments were taken from Laguna Jachucoposa (Cop) and Laguna Pujsa (Puj) where microbialmats are not present. Total metagenomic DNA extraction was performed on each sample and the V4 hypervariable region of thebacterial 16S rRNA gene was amplified by pyrosequencing using the Ribosomal Database Project (RDP)-suggested universalprimers. Diversity of the microbial community was assessed using the QIIME software package. Lakes that harbor microbialmats have a higher salinity and a lower dissolved oxygen concentration and proportion of organic matter and total phosphorousthan lakes where mats are absent. All the samples have important concentrations of arsenic, with an extremely high amount inPuj. Proteobacteria and/or Bacteroidetes are the major phyla represented in all samples. Also, other phyla as Spirochaetes,Chloroflexi or Verrucomicrobia are found. However, cyanobacterial sequences are only observed in LL2 and Puj. On the otherhand, we have found a higher diversity in sediment than in mat samples. The sediments samples contain phyla not observed inmat samples. 16S rRNA gene sequences classified within Actinobacteria and Gracilibacteria are only found in Puj and related toTenericutes, Gemmatimonadetes and Acidobacteria are only observed in Cop. Finally, an important fraction of the sequencescould not be classified at phylum level. The high diversity found in sediment samples may be explained by the physicochemicalconditions in the environment. For example, they have a lower conductivity than mat samples. It is known hypersalineenvironments have a low diversity, where halophilic microorganisms are able to survive to these extreme conditions becausethey have specific strategies to balance the osmotic pressure. Besides, we found a low proportion or absence of Cyanobacteriain the ecosystems studied, suggesting the possibility that other groups may be playing an essential role as primary producers inthese extreme environments. Additionally, the large proportion of 16S rRNA gene sequences that could not be affiliated to anyknown bacterial phyla suggesting that in these ecosystems there are potential novel representatives of bacterial phyla not yetdescribed.Fil: Fernández, Ana Belén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; ArgentinaFil: Rasuk, Maria Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; ArgentinaFil: Kurth, Daniel German. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; ArgentinaFil: Contreras, M.. No especifíca;Fil: Novoa, F.. No especifíca;Fil: Poire, D.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Farias, Maria Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; ArgentinaXI Congreso Argentino de Microbiología GeneralCórdobaArgentinaSociedad Argentina de Microbiología Genera

Conciliación de la medicación al ingreso en paciente crónico pediátrico: estudio multicéntrico

Conciliación de la medicación; Discrepancia; PediatríaMedication reconciliation; Discrepancy; PaediatricsConciliació de la medicació; Discrepància; PediatriaIntroduction Medication reconciliation (MC) is one of the main strategies to reduce medication errors in care transitions. In Spain, several guidelines have been published with recommendations for the implementation and development of MC aimed at the adult population, although paediatric patients are not included. In 2018, a study was carried out that led to the subsequent publication of a document with criteria for selecting paediatric patients in whom CM should be prioritised. Objectives To describe the characteristics of paediatric patients most likely to suffer from errors of reconciliation (EC), to confirm whether the results of a previous study can be extrapolated. Methodology Prospective, multicentre study of paediatric inpatients. We analysed the CE detected during the performance of the CM on admission. The best possible pharmacotherapeutic history of the patient was obtained using different sources of information and confirmed by an interview with the patient/caregiver. Results 1043 discrepancies were detected, 544 were identified as CD, affecting 317 patients (43%). Omission of a drug was the most common error (51%). The majority of CD were associated with drugs in groups A (31%), N (23%) and R (11%) of the ATC classification. Polymedication and onco-haematological based disease were the risk factors associated with the presence of CD with statistical significance. Conclusions The findings of this study allow prioritisation of CM in a specific group of paediatric patients, favouring the efficiency of the process. Onco-haematological patients and polymedication are confirmed as the main risk factors for the appearance of CD in the paediatric population.Introducción La conciliación de la medicación (CM) es una de las principales estrategias para disminuir los errores de medicación en las transiciones asistenciales. En España existen publicadas diferentes guías con recomendaciones para la implantación y desarrollo de la CM orientadas a población adulta, sin estar los pacientes pediátricos incluidos. En el año 2018 se llevó a cabo un estudio que permitió la posterior publicación de un documento con criterios de selección de pacientes pediátricos en los que priorizar la CM. Objetivos Describir las características de los pacientes pediátricos con mayor probabilidad de sufrir errores de conciliación (EC), para confirmar si los resultados de un estudio previo son extrapolables. Metodología Estudio prospectivo y multicéntrico con pacientes pediátricos ingresados. Se analizaron los EC detectados durante la realización de la CM al ingreso. La mejor historia farmacoterapéutica posible del paciente fue obtenida utilizando diferentes fuentes de información y confirmándose con una entrevista con el paciente/cuidador. Resultados Se detectaron 1.043 discrepancias, determinándose como EC 544, afectando a 317 pacientes (43%). La omisión de algún medicamento fue el error más común (51%). La mayoría de los EC se asociaron con los medicamentos de los grupos A (31%), N (23%) y R (11%) de la clasificación ATC. La polimedicación y la enfermedad de base onco-hematológica fueron los factores de riesgo asociados a la presencia de EC con significación estadística. Conclusiones Los hallazgos de este estudio permiten priorizar la CM en un grupo concreto de pacientes pediátricos, favoreciendo la eficiencia del proceso. Los pacientes onco-hematológicos y la polimedicación se confirman como los principales factores de riesgo para la aparición de EC en población pediátrica.The study was funded by the Fundación Española de Farmacia Hospitalaria through the 2019–2020 grant programme

Estudio multicéntrico de conciliación de la medicación en onco-hematología pediátrica

Conciliación de la medicación; Pediatría; OncologíaMedication reconciliation; Pediatrics; OncologyConciliació de la medicació; Pediatria; OncologiaObjective To determine the prevalence of reconciliation errors on admission to hospital in the pediatric onco-hematological population in order to check whether they are similarly susceptible to these reconciliation errors as adults and to describe the characteristics of the patients who suffer them. Methods A 12-month prospective, multicentre study of medication reconciliation on admission in the pediatric onco-hematological population to assess the incidence of reconciliation errors and to describe the characteristics of the patients. Results Medication reconciliation was performed in 157 patients. At least a medication discrepancy was detected in 96 patients. Of the discrepancies detected, 52.1% were related to patient's new clinical situation or by the physician, while 48.9% were determined to be reconciliation errors. The most frequent type of reconciliation error was the “omission of a medication”, followed by “a different dose, frequency or route of administration”. A total of 77 pharmaceutical interventions were carried out, 94.2% of which were accepted. In the group of patients with a number equal to or greater than 4 drugs in home treatment, there was a 2.1-fold increase in the probability of suffering a reconciliation error. Conclusions In order to avoid or reduce errors in one of the critical safety points such as transitions of care, there are measures such as medication reconciliation. In the case of complex chronic pediatric patients, such as onco-hematological patients, the number of drugs as part of home treatment is the variable that has been associated with the presence of medication reconciliation errors on admission to hospital, and the omission of some medication was the main cause of these errors.Objetivo Determinar la prevalencia de errores de conciliación al ingreso hospitalario en la población pediátrica onco-hematológica para comprobar si ésta presenta una susceptibilidad similar a la de los adultos para sufrir estos errores de conciliación y describir las características de los pacientes que los sufren. Método Estudio prospectivo y multicéntrico, de 12 meses de duración, de conciliación de medicación al ingreso en población pediátrica onco-hematológica para evaluar la incidencia de errores de conciliación y describir las características de los pacientes en los que se producen. Resultados Se concilió la medicación de 157 pacientes. En 96 pacientes se detectó al menos 1 discrepancia de la medicación. De las discrepancias detectadas el 52,1% fueron justificadas por la nueva situación clínica del paciente o por el médico responsable mientras que el 48,9% se consideraron errores de conciliación. El tipo de error de conciliación más frecuente fue la «omisión de algún medicamento», seguido por «una dosis, frecuencia o vía de administración diferente». Se efectuaron un total de 77 intervenciones farmacéuticas, de las que se aceptaron el 94,2%. En el grupo de pacientes con un número igual o mayor a 4 fármacos en tratamiento domiciliario se observó un incremento de 2,1 veces la probabilidad de sufrir un error de conciliación. Conclusiones Para evitar o reducir los errores en uno de los puntos críticos de seguridad como son las transiciones asistenciales, existen medidas, como la conciliación de la medicación. En el caso de los pacientes pediátricos crónicos complejos, como los pacientes onco-hematológicos, el número de fármacos como parte del tratamiento domiciliario es la variable que se ha asociado a la presencia de errores de conciliación al ingreso hospitalario, siendo la omisión de algún medicamento la causa principal de estos errores

Documenting and Understanding Workplace injuries among Latino Day Laborers

BACKGROUND: Latino day laborers face substantial injuries at work. We present a comprehensive assessment of their injury experience and explore the predictors of selfreported injuries. METHODS: Worker and injury characteristics were collected from 331 day laborers using an innnovative injury assessment tool. The odds of injury were estimated using a logistic regression. RESULTS: Participants were foreign-born, Spanish monolingual, and employed in construction. Sixty-seven individuals reported 88 past-year injuries, mostly involving the upper or lower extremities. Injuries were caused by moving heavy objects, falling, or being struck an object. Of the documented injuries, 24% were not reported at work due to fear of being fired; 64.4% resulted in missed workdays, 54.0% in temporary incapacitation, and 34.5% in permanent incapacitation. Being married significantly reduced the odds of reporting an injury. DISCUSSION: Better documentation can inform the development of better policy protections that ameliorate injuries experienced by Latino day laborers at the workplace