Evaluation of gold adsorption on activated carbon from real cyanide and thiourea leachate solutions.

The recovery of gold by adsorption using activated carbon from sodium cyanide and thiourea leached solutions are reported in this study. The leached solutions were obtained under real operating conditions from the beneficiation plant "Paz Borja", Machala-Ecuador. Calgon Carbon DG-11 6X12 type, widely used in the local metallurgical industry was used as adsorbent material. The operational parameters varied during the adsorption process experiments included the concentration of leaching agent, agitation speed, dose of activated carbon and initial concentration of gold. The control parameters included density, percentage of solid, pH, temperature, and solution potential. The obtained results were adjusted to mass transfer model by diffusion through the interface and the Freundlich model for the equilibrium isotherms. The analysis of the results indicates a higher adsorption rate of the gold di-cyanide complex on activated carbon compared to gold-thiourea complexes.

Simultaneous quantification of lead, cadmium and zinc in superficial marine sediments using a carbon-fiber microelectrode modified with bismuth film.

Marine sediments are a useful environmental assessment matrix as they naturally trap toxic substances of anthropogenic origin and thus have higher concentrations of these than the surrounding water. Therefore, developing methods for the sensitive, accurate, and inexpensive quantification of these substances is important, as the traditional techniques have various disadvantages. The current study evaluated the effectiveness of an in situ bismuth-modified carbon-fiber microelectrode (voltamperometric sensor) to simultaneously detect Pb, Cd, and Zn in marine sediments from Puerto Jeli in El Oro Province, Ecuador. This site is representative of the contamination levels present along the coast in this province. Differential pulse anodic stripping voltammetry was applied, and the resulting linear regression for the metal quantification ranged from 12 to 50 µg mL-1, with quantification limits for Pb(II), Cd(II), and Zn(II) of 18.69, 12.55, and 19.29 µg mL-1, respectively. Thus, the quantification with the sensor was successful. According to the preliminary results, Cd and Pb values exceeded the permissible limits established by Ecuador (Texto Unificado de la Legislación Secundaria del Ministerio del Ambiente) and the US Environmental Protection Agency, respectively.

KLRC1 knockout overcomes HLA-E-mediated inhibition and improves NK cell antitumor activity against solid tumors.

Introduction: Natural Killer (NK) cells hold the potential to shift cell therapy from a complex autologous option to a universal off-the-shelf one. Although NK cells have demonstrated efficacy and safety in the treatment of leukemia, the limited efficacy of NK cell-based immunotherapies against solid tumors still represents a major hurdle. In the immunosuppressive tumor microenvironment (TME), inhibitory interactions between cancer and immune cells impair antitumoral immunity. KLRC1 gene encodes the NK cell inhibitory receptor NKG2A, which is a potent NK cell immune checkpoint. NKG2A specifically binds HLA-E, a non-classical HLA class I molecule frequently overexpressed in tumors, leading to the transmission of inhibitory signals that strongly impair NK cell function. Methods: To restore NK cell cytotoxicity against HLA-E+ tumors, we have targeted the NKG2A/HLA-E immune checkpoint by using a CRISPR-mediated KLRC1 gene editing. Results: KLRC1 knockout resulted in a reduction of 81% of NKG2A+ cell frequency in ex vivo expanded human NK cells post-cell sorting. In vitro, the overexpression of HLA-E by tumor cells significantly inhibited wild-type (WT) NK cell cytotoxicity with p-values ranging from 0.0071 to 0.0473 depending on tumor cell lines. In contrast, KLRC1 KO NK cells exhibited significantly higher cytotoxicity when compared to WT NK cells against four different HLA-E+ solid tumor cell lines, with p-values ranging from<0.0001 to 0.0154. Interestingly, a proportion of 43.5% to 60.2% of NKG2A- NK cells within the edited NK cell population was sufficient to reverse at its maximum the HLA-E-mediated inhibition of NK cell cytotoxicity. The expression of the activating receptor NKG2C was increased in KLRC1 KO NK cells and contributed to the improved NK cell cytotoxicity against HLA-E+ tumors. In vivo, the adoptive transfer of human KLRC1 KO NK cells significantly delayed tumor progression and increased survival in a xenogeneic mouse model of HLA-E+ metastatic breast cancer, as compared to WT NK cells (p = 0.0015). Conclusions: Our results demonstrate that KLRC1 knockout is an effective strategy to improve NK cell antitumor activity against HLA-E+ tumors and could be applied in the development of NK cell therapy for solid tumors.

Representativeness of the particulate matter pollution assessed by an official monitoring station of air quality in Santiago, Chile: projection to human health.

Santiago, capital city of Chile, presents air pollution problems for decades mainly by particulate matter, which significantly affects population health, despite national authority efforts to improve air quality. Different properties of the particulate matter (PM10, PM2.5 and PM1 fractions, particle surface and number) were measured with an optical spectrometer. The sampling was done during spring 2019 at different sites within the official representative area of Independencia monitoring station (ORMS-IS). The results of this study evidence large variations in PM mass concentration at small-scale areas within the ORMS-IS representative zone, which reports the same value for the total area. Results from PM properties such as PM1, particle number and particle surface distribution show that these properties should be incorporated in regular monitoring in order to improve the understanding of the effects of these factors on human health. The use of urban-climate canopy-layer models in a portion of the sampled area around the monitoring station demonstrates the influence of street geometry, building densities and vegetation covers on wind velocity and direction. These factors, consequently, have an effect on the potential for air pollutants concentrations. The results of this study evidence the existence of hot spots of PM pollution within the area of representativeness of the ORMS-IS. This result is relevant from the point of view of human health and contributes to improve the effectiveness of emission reduction policies.

Molecular basis for antiviral activity of two pediatric neutralizing antibodies targeting SARS-CoV-2 Spike RBD.

Neutralizing antibodies (NAbs) hold great promise for clinical interventions against SARS-CoV-2 variants of concern (VOCs). Understanding NAb epitope-dependent antiviral mechanisms is crucial for developing vaccines and therapeutics against VOCs. Here we characterized two potent NAbs, EH3 and EH8, isolated from an unvaccinated pediatric patient with exceptional plasma neutralization activity. EH3 and EH8 cross-neutralize the early VOCs and mediate strong Fc-dependent effector activity in vitro. Structural analyses of EH3 and EH8 in complex with the receptor-binding domain (RBD) revealed the molecular determinants of the epitope-driven protection and VOC evasion. While EH3 represents the prevalent IGHV3-53 NAb whose epitope substantially overlaps with the ACE2 binding site, EH8 recognizes a narrow epitope exposed in both RBD-up and RBD-down conformations. When tested in vivo, a single-dose prophylactic administration of EH3 fully protected stringent K18-hACE2 mice from lethal challenge with Delta VOC. Our study demonstrates that protective NAbs responses converge in pediatric and adult SARS-CoV-2 patients.

An Ecological Inquiry on Young People's Suicidal Ideation at University: Individual, Relational and Cultural Factors and Their Interactions.

To understand the factors related to suicidal ideation in university students, we examined individual and microsystemic variables with an ecological model organizing bidirectional influences between different dimensions. Suicidal ideation, psychological distress, multidimensional self-concept, loneliness, community social support, life satisfaction, family functioning, bullying victimization, and problematic use of virtual social networks were measured in a sample of 376 Mexican university students (67% women) from 18 to 34 years of age (M = 20.8). Data were collected in March 2020, before mandatory confinement for COVID started in Mexico. Discriminant analyses showed that psychological distress, loneliness, self-concept, life satisfaction, family functioning, internet violence/rejection, and informal social support predicted belonging to high or no suicidal ideation groups with 88% accuracy. Only psychological distress and family self-concept predicted suicidal ideation in multilinear regression analyses. There were differences by gender in multilinear regression, with family self-concept significant for women and physical self-concept, but not family self-concept for boys. Conclusions: Early Suicide prevention in universities should include periodic screening of psychological distress, loneliness, and virtual social media use to identify students that need further evaluation and intervention. University-based strategies of mental health promotion that strengthen family relationships and the sense of community, including gender-sensitive orientation, could enhance the effect of protective factors.

Prevalencia de no resiliencia y factores asociados en escolares de un municipio colombiano, 2019

Objetivo: Determinar la prevalencia de no resiliencia y los factores demográficos, escolares y familiares asociados, en escolares de un municipio colombiano, en el año 2019. Metodología: Estudio trasversal, con muestreo probabilístico estratificado bietápico, con una muestra de 2958 escolares, a los que se les aplicó el cuestionario JJ46. Se calculó la prevalencia de no resiliencia y se relacionó con los factores indicados, mediante intervalos de confianza del 95 %. Además, se construyó una regresión binomial para la no resiliencia, teniendo presente el control de aquellas variables independientes que podrían confundir la relación con el desenlace. Resultados: Se encontró una prevalencia de no resiliencia del 58,4 %, siendo mayor en los hombres, de la zona urbana, que cursaban grado séptimo y que habían vivido algún evento vulnerable, en el 22,0, 29,0, 73,0 y 40,0 % respectivamente, con respecto a las mujeres, de la zona rural, que estaban en grado noveno y que no habían vivido eventos vulnerables. La prevalencia de no resiliencia en los hombres excedió en un 20 % el de las mujeres; y con respecto a la persona que le daba más cariño al escolar, en el 88 % de los casos eran otros familiares distintos a ambos padres. Conclusiones: Urge la necesidad de implementar talleres en los programas educativos sobre la promoción de la resiliencia y realizar una valoración periódica de la misma.

Objective: To determine the prevalence of non-resilience and associated demographic, school, and family factors in schoolchildren in a Colombian municipality in 2019. Methodology: This is a cross-sectional study with twostage stratified probability sampling on a sample of 2,958 schoolchildren to whom the JJ46 questionnaire was administered. We calculated the prevalence of non-resilience and related it to the selected factors using 95% confidence intervals. Moreover, we constructed a binomial regression for non-resilience while controlling the independent variables that could potentially misidentify the relationship with the outcome. Results: A 58.4% prevalence of non-resilience was found, being higher in males (22.0%), from the urban area (29.0%), in the seventh grade (73.0%), and who had experienced some vulnerable event (40.0%), compared to females, from the rural area, in the ninth grade, and who had not experienced vulnerable events. The prevalence of non-resilience in males exceeded that of females by 20%. In 88% of cases, the most affectionate person to the schoolchild was another relative other than the parents. Conclusions: There is an urgent need to implement workshops in school programs for the promotion of resilience and to conduct a periodic assessment of resilience.

Objetivo: Determinar a prevalência de não resiliência e os fatores demográficos, escolares e familiares associados, em escolares de um município colombiano, no ano 2019. Metodologia: Estudo transversal, com amostragem probabilística estratificada bietápica, com uma amostra de 2958 escolares, aos que se aplicou o questionário JJ46. Foi calculada a prevalência de não resiliência e associada com os fatores indicados, por meio de intervalos de confiança do 95%. Além disso, construiu-se uma regressão binomial para a não resiliência, considerando o controle daquelas variáveis independentes que poderiam confundir a relação com o desenlace. Resultados: Achouse uma prevalência de não resiliência de 58,4%, sendo maior nos homens, da zona urbana, que cursavam sétimo grau e que tinham vivido algum evento vulnerável, de 22,0, 29,0, 73,0 e 40,0% respectivamente, em relação com as mulheres, da zona rural, que estavam em nono grau e que não tinham vivido eventos vulneráveis. A prevalência de não resiliência nos homens excedeu em um 20% à das mulheres; e no que tange à pessoa que dava mais carinho ao escolar, 88% dos casos eram outros familiares diferentes a ambos os pais. Conclusões: Urge a necessidade de implementar oficinas nos programas educativos sobre a promoção da resiliência e realizar uma valoração periódica da mesma.

Distribución espacial de la morbimortalidad atribuible a la contaminación del aire por PM2.5 en Medellín (Colombia), 2010-2016

Objetivo: Esta investigación buscó establecer la distribución espacial de la morbimortalidad atribuible a la contaminación del aire ambiental por materia particulada (particulate matter 2.5) (PM2.5) en Medellín entre 2010 y 2016. Metodología: Se planteó un estudio ecológico. Se estandarizaron las direcciones de residencia de los pacientes atendidos y las defunciones por eventos de interés. Se emplearon mapas de calor, mediante el análisis de densidad de Kernel, por núcleos domiciliarios para áreas de 10 000 m2. Resultados: Se encontraron 45 487 y 2743 casos y defunciones, respectivamente, atribuibles a la contaminación del aire ambiental por PM2.5 con datos de localización geográfica. La zona suroccidental de la ciudad presentó las mayores densidades de eventos atribuibles por todas las causas estudiadas y por grupo de eventos, con algunas áreas pequeñas en otros lugares. Por su parte, la zona suroriental, con las mejores condiciones socioeconómicas, manifestó la menor concentración de eventos atribuibles. Conclusión: La información geocodificada de la morbimortalidad por núcleos domiciliarios posibilitó establecer la distribución de casos y muertes atribuibles a la contaminación ambiental del aire por PM2.5 en Medellín, con mayor concentración al suroccidente de la ciudad, lo que permite evidenciar la presencia de disparidades territoriales de este fenómeno.

Objective: This research aimed to establish the spatial distribution of morbidity and mortality attributable to particulate matter (pm2.5) air pollution in Medellín between 2010 and 2016. Methodology: An ecological study was proposed. Addresses of patients treated and deceased due to events of interest were standardized. Heat maps were used, through Kernel density analysis per residential units for areas of 10,000 m2. Results: 45,487 cases and 2,743 deaths attributable to pm2.5 air pollution with geographic location data were found. The southwestern area of the city presented the highest event densities attributable to all causes studied and by group of events, with some small areas in other places. On the other hand, the southeastern area, with the best socio-economic conditions, showed the lowest concentration of attributable events. Conclusion: Geocoded information of morbidity and mortality by residential units made it possible to establish the distribution of cases and deaths attributable to pm2.5 air pollution in Medellín, with a greater concentration in the southwestern part of the city, which makes the presence of territorial disparities in this phenomenon observable.

Objetivo: Esta pesquisa procurou estabelecer a distribuição espacial da morbimortalidade atribuível à poluição do ar ambiental por matéria particulada (particulate matter 2.5) (PM2.5) em Medellín entre 2010 e 2016. Metodologia: Propôs-se uma abordagem ecológica. Padronizaram-se os endereços de residência dos pacientes atendidos e as mortes por eventos de interesse. Empregaram-se mapas de calor, por meio da análise de densidade de Kernel, por núcleos domiciliários para áreas de 10000 m2. Resultados: Acharam-se 45487 e 2743 casos e mortes, respectivamente, atribuíveis à poluição do ar ambiental por PM2.5 com dados de localização geográfica. A zona do sudoeste da cidade apresentou as maiores densidades de eventos atribuíveis por todas as causas estudadas e por grupo de eventos, com algumas áreas pequenas em outros lugares. Por sua parte, a zona do sudeste, com as melhores condições socioeconômicas, manifestou a menor concentração de eventos atribuíveis. Conclusão: A informação geocodificada da morbimortalidade por núcleos domiciliários possibilitou estabelecer a distribuição de casos e mortes atribuíveis à poluição ambiental do ar por PM2.5 em Medellín, com maior concentração no sudoeste da cidade, o que permite evidenciar a presença de disparidades territoriais deste fenômeno

Supervivencia y factores asociados en pacientes con cáncer cervicouterino atendidas por el Seguro Popular en México.

 Objetivo. Estimar la supervivencia a cinco años por cáncer cervicouterino y sus factores asociados en pacientes mexica-nas, cuya atención fue financiada por el Fondo de Protección contra Gastos Catastróficos (FPGC) del Seguro Popular durante el periodo 2006-2014. Material y métodos. Se analizó la base de datos de las pacientes mencionadas y se vinculó con el Subsistema Epidemiológico y Estadístico de Defunciones. Se hizo un análisis de supervivencia a cinco años por etapa clínica y factores asociados, mediante el método de Kaplan-Meier y los modelos de riesgos proporcionales de Cox. Resultados. La supervivencia global por cáncer cervicouterino a los cinco años fue de 68.5%. Los factores asociados fueron la etapa clínica (locoregional [HR=2.8 IC95% HR: 2.6,3.0] y metastásica [HR=5.4 IC95% HR: 4.9,5.9]) com-parada con la etapa temprana y la edad (HR=1.003 IC95% HR:1.001,1.004). Conclusiones. Las mujeres que lograron el acceso a la atención del cáncer cervical financiadas por el FPGC tuvieron una supervivencia ligeramente superior a las reportadas en otros estudios.

Production of Protein Hydrolysate from Quinoa (Chenopodium quinoa Willd.): Economic and Experimental Evaluation of Two Pretreatments Using Supercritical Fluids' Extraction and Conventional Solvent Extraction.

Supercritical fluids' extraction (SFE) and conventional solvent extraction (CSE) for defatting of quinoa flour as pretreatments to produce the quinoa protein hydrolysate (QPH) were studied. The objective was to extract the oil and separate the phenolic compounds (PC) and the defatted quinoa flour for subsequent quinoa protein extraction and enzymatic hydrolysis. The oil extraction yield (OEY), total flavonoid content (TFC), and QPH yield were compared. SuperPro Designer 9.0® software was used to estimate the cost of manufacturing (COM), productivity, and net present value (NPV) on laboratory and industrial scales. SFE allows higher OEY and separation of PC. The SFE oil showed a higher OEY (99.70%), higher antioxidant activity (34.28 mg GAE/100 g), higher QPH yield (197.12%), lower COM (US$ 90.10/kg), and higher NPV (US$ 205,006,000) as compared to CSE (with 77.59%, 160.52%, US$ 109.29/kg, and US$ 28,159,000, respectively). The sensitivity analysis showed that the sale of by-products improves the economic results: at the industrial scale, no significant differences were found, and both processes are economically feasible. However, results indicate that SFE allows the recovery of an oil and QPH of better nutritional quality and a high level of purity-free organic solvents for further health and nutraceutical uses.

Relación de PM2, 5 y Enfermedad Respiratoria Aguda en un territorio de Colombia: Modelos Aditivos Generalizados / Relationship between PM2. 5 and Acute Respiratory Disease in a Colombian region: Generalized Additive Models

Introducción: El efecto deletéreo de material particulado fino exterior sobre la salud respiratoria de la población de niños y de adultos mayores, es de interés en salud pública. Objetivo: Establecer el efecto de la contaminación por Material Particulado de menos de 2,5 μm de diámetro (PM2,5), sobre la Enfermedad Respiratoria Aguda (ERA) en los menores de 5 y personas de mínimo 65 años, ajustado por variables meteorológicas y climáticas, en los municipios del Área Metropolitana del Valle de Aburrá (Colombia), 2008 a 2015. Materiales y métodos: Estudio ecológico con información de la red de vigilancia de calidad del aire y de registros de prestación de servicios de salud. Se construyeron Modelos Aditivos Generalizados con función de enlace Poisson y suavización spline. Para cada rezago distribuido se calculó la medida de la asociación e intervalo de confianza. Resultados: Los casos de ERA aumentaron significativamente en los menores de 5 años en Envigado y Caldas (43,3% vs 29,6%) y en los de 65 y más años, en Medellín (13,2%) por cada incremento de 10 µg/m3 en PM2,5 al día quince a partir de la exposición. Conclusiones: Los eventos diarios respiratorios tuvieron especial frecuencia en Medellín y en municipios de la zona sur.

Introduction: The harmful effect of fine particulate matter on the respiratory health of child and elderly populations is a concern for public health. Objective: To establish the effect of pollution by less than 2.5 μm in diameter (PM2.5) particulate matter on Acute Respiratory Disease (ARD) during 2008-2015 in children younger than 5 and adults older than 65 from the Metropolitan Area of the Aburrá Valley (Colombia), adjusting for meteorological and climate variables. Materials and methods: Ecological study with information from the air quality surveillance network and individual records of health providers. Generalized Additive Models were developed using smoothing spline Poisson models. The assessment of the association and confidence intervals were calculated for each distributed lag. Results: For each 10 µg/m3 increment in PM2,5 and the day 15 post-exposure, ARD cases increased significantly in populations who are younger than 5 and older than 65 in Envigado and Caldas (43.3% vs. 29.6%) and Medellín (13.2%), respectively. Conclusions: Daily respiratory events had a special frequency in Medellín and the municipalities of the southern region.

Supervivencia y factores asociados en pacientes con cáncer cervicouterino atendidas por el Seguro Popular en México / Survival analysis and associated factors in patients with cervical cancer financed by the Seguro Popular in Mexico

Resumen: Objetivo: Estimar la supervivencia a cinco años por cáncer cervicouterino y sus factores asociados en pacientes mexicanas, cuya atención fue financiada por el Fondo de Protección contra Gastos Catastróficos (FPGC) del Seguro Popular durante el periodo 2006-2014. Material y métodos: Se analizó la base de datos de las pacientes mencionadas y se vinculó con el Subsistema Epidemiológico y Estadístico de Defunciones. Se hizo un análisis de supervivencia a cinco años por etapa clínica y factores asociados, mediante el método de Kaplan-Meier y los modelos de riesgos proporcionales de Cox. Resultados: La supervivencia global por cáncer cervicouterino a los cinco años fue de 68.5%. Los factores asociados fueron la etapa clínica (locoregional [HR=2.8 IC95% HR: 2.6,3.0] y metastásica [HR=5.4 IC95% HR: 4.9,5.9]) comparada con la etapa temprana y la edad (HR=1.003 IC95% HR:1.001,1.004). Conclusiones: Las mujeres que lograron el acceso a la atención del cáncer cervical financiadas por el FPGC tuvieron una supervivencia ligeramente superior a las reportadas en otros estudios.

Abstract: Objective: Estimate five-year survival from cervical cancer and associated factors in Mexican patients financed by Seguro Popular during the period 2006-2014. Materials and methods: We analyzed the database of patients financed by the Catastrophic Expenses Protection Fund and linked it to the Statistical and Epidemiological System of mortality. We performed a five-year survival analysis by clinical stage and associated factors, using the Kaplan-Meier method and Cox proportional hazards models. Results: Overall survival for cervical cancer at five years was 68.5%. The associated factors were the clinical stage: locoregional (HR=2.8 CI95% HR: 2.6,3.0) and metastatic (HR=5.4 CI95% HR: 4.9,5.9) compared to early stage and age (HR=1.003 CI95% HR:1.001,1.004). Conclusions: Women who gained access to Catastrophic Expenses Protection Fund cervical cancer care had similar survival than that reported in other studies.

Effectiveness of tailored intervention with a salutogenic approach to improve adherence in adults with hypertension: a non-randomized trial.

AIMS: Hypertension (HTN) is a chronic long-term, slowly progressing disease. For HTN control, management, and prevention of associated complications, adequate adherence to treatment is required. It has been proposed that tailored interventions to individual needs are required to address the phenomenon of adherence to treatment. However, studies evaluating the effects of tailored interventions to improve adherence are still scarce. The aim of this study is to evaluate the effectiveness of a tailored intervention using a salutogenic approach, to improve adherence in patients with HTN. METHODS AND RESULTS: A non-randomized trial design was used in this study. Adult patients with HTN were allocated in two groups: tailored intervention (n = 75) and standard care (n = 78). The content of the tailored intervention was based on personal resources and elaboration of an action plan with objectives in agreement with the patients. Patient outcomes (treatment adherence, blood pressure) were assessed both at the beginning of the study and at the 4-week follow-up for the intervention group and the standard care group. The Treatment Adherence Questionnaire for Patients with Hypertension was used to measure adherence. The results of this study showed that the total score and each dimension of the adherence questionnaire (medications, diet, physical activity, weight control, stimulation, and stress relief) increased significantly in the experimental group compared with the control group (P < 0.05). For the group assigned to tailored intervention, the delta score of the total adherence score increased in the final evaluation to 9.4 (95% CI = 8.60-10.28). CONCLUSION: A tailored intervention with a salutogenic approach appears to be effective for improving adherence in patients with HTN. Randomized controlled trials are required to confirm the effect of tailored interventions in this type of population.

Total mercury determination in bivalves Anadara tuberculosa sold in open markets from Quito, Ecuador.

This study aimed to quantify the amount of total mercury in bivalves Anadara tuberculosa supplied from Esmeraldas Province and sold in markets in the Metropolitan District of Quito, Ecuador. The determined total mercury concentration was compared to the permissible limits established by the European Commission and World Health Organization-Food and Agriculture Organization and health risk subsequently assessed. Sampling was conducted in five open markets and involved collecting fifteen specimens from each market. Total mercury was measured through cold vapor atomic fluorescence spectrophotometry. Results showed that samples did not exceed the total mercury threshold value (0.5 mg kg-1). However, samples of Anadara tuberculosa from the Ofelia market, which receives fresh products from Eloy Alfaro canton, contained the highest mean levels of mercury contamination, 0.055 mg kg-1. This result could be associated to the influence of illegal mining activity in this area. In addition, methylmercury potential non-carcinogenic risk for consumers exceeded the threshold limit (>1) established by the US Environmental Protection Agency. The daily consumption rate (Rclim) was determined to be 26.61-38.50 g for a child weight of 14.5 kg, and 128.44-185.84 g for an adult weight of 70 kg. Thus, consuming a higher amount of Anadara tuberculosa could negatively affect human health.

Local attributable burden disease to PM 2.5 ambient air pollution in Medellín, Colombia, 2010-2016.

Background: Exposure to 2.5-micron diameter air pollutants (PM 2.5) has been associated with an increased risk of illness and death worldwide; however, in Latin American health impacts assessment of this risk factor is scarce. Medellín is one of the most polluted cities in the region, with a population growth rate that is twice as high as that of other Colombian cities, which implies a growing population at risk. Methods: A descriptive study of the disease burden was carried out using the city as the unit of observation. Health events were selected based on epidemiologic evidence and the availability of the population attributable fraction associated with PM 2.5. The mortality records were taken from the module of deceased of the Single Registry of Affiliates of the Health System; the morbidity records were taken from the Individual Health Services Registries. For the estimation of the burden of disease, the current Global Burden of Disease guidelines were followed. Results: Attributable disability-adjusted life years to exposure to ambient PM 2.5 pollution (DALYs PM2.5) constituted 13.8% of total burden of the city. Males showed the greatest loss of DALYs PM2.5 due to acute events, while in women the greatest loss was due to chronic events. Ischemic heart disease, chronic diseases of the lower respiratory tract, and influenza and pneumonia were the events that contributed the most to DALYs PM2.5. 71.4% of the DALYs PM2.5 corresponded to mortality, mainly in the population over 65 years of age. Regarding attributable morbidity, acute events were more prevalent in both sexes, especially due to respiratory diseases Conclusion: Premature death among the elderly population has the greatest weight on burden of disease attributable to ambient PM 2.5 pollution, mainly due to respiratory and cardiovascular diseases, without significant differences according to gender.

Valoración de la resiliencia en escolarizados: línea base para programas de intervención, Antioquia, 2018 / Assessment of resilience in schoolchildren: baseline for intervention programs, Antioquia, 2018 / Valoração da resiliência em escolarizados: línea base para programas de intervenção, Antioquia, 2018

Resumen Objetivo: determinar los niveles de resiliencia en los estudiantes de 12 a 17 años de las instituciones públicas urbanas de las subregiones del departamento de Antioquia, Colombia. Método: transversal en 2185 estudiantes y en muestras independientes por subregión, a quienes se les aplicó un cuestionario de valoración de la resiliencia en adolescentes, el JJ46. Se calcularon los niveles de resiliencia y se analizó la relación entre estos con características demográfico-familiares y de vulnerabilidad social. Resultados: en Antioquia predominó la resiliencia media, 53,9%. Los escolarizados de las subregiones Oriente, Suroeste y Norte fueron los que obtuvieron los puntajes más altos de resiliencia, con 57,1%, 53,9% y 50,6%, respectivamente, y los de las subregiones Magdalena Medio, Urabá y Bajo Cauca los menores. En el Valle de Aburrá la resiliencia fue media: 44,2%. Conclusiones: diseñar intervenciones en los escolarizados de los municipios de las subregiones con niveles de resiliencia media e inferior.

Abstract Objective: To determine the levels of resilience in students aged 12 to 17 years of urban public institutions in the subregions of the department of Antioquia, Colombia. Method: Cross-sectional study with 2185 students in independent samples by sub-region to whom the JJ46 questionnaire for assessing resilience in adolescents was applied. Resilience levels were calculated and the relationship between these and demographic-family characteristics and social vulnerability was analyzed. Results: the average resilience, 53.9%, prevailed in the Department of Antioquia. Schoolchildren from the East, Southwest and North subregions obtained the highest resilience scores, with 57.1%, 53.9% and 50.6% respectively, and those from the subregions of Magdalena Medio, Urabá and Bajo Cauca obtained the lower scores. In the Aburrá Valley, resilience was average, 44.2%. Conclusions: There is a need to design interventions in schoolchildren of the municipalities of the subregions with medium and lower levels of resilience.

Resumo Objetivo: determinar os níveis de resiliência nos estudantes de 12 a 17 anos das instituições públicas urbanas das sub-regiões do departamento de Antioquia, Colômbia. Método: transversal em 2185 estudantes e em amostras independentes por sub-região, a quem se lhes aplicou um questionario de valoração da resiliência em adolescentes, o JJ46. Calcularam-se os níveis de resiliência e se analisou a relação entre estes com características demográficofamiliares e de vulnerabilidade social. Resultados: em Antioquia predominou a resiliência media, 53,9%. Os escolarizados das sub-regiões Oriente, Sul-oeste e Norte foram os que obtiveram as pontuações mais altas de resiliência, com 57,1%, 53,9% e 50,6%, respectivamente, e os das sub-regiões Magdalena Médio, Urabá e Baixo Cauca os menores. No Vale de Aburrá a resiliência foi media: 44,2%. Conclusões: desenhar intervenções nos escolarizados dos municípios das sub-regiões com níveis de resiliência media e inferior.

Loss of years of healthy life due to road incidents of motorcyclists in the city of Medellin, 2012 to 2015.

OBJECTIVE: Determine the loss of years of healthy life due to road incidents of motorcyclists in the city of Medellin from 2012 to 2015. METHODS: Descriptive study with data on health care of injured motorcyclists and deaths adjusted with the Preston and Coale method, and OPS proportional distribution for the period 2012-2015. The years of life lost due to premature death (YLLs), years lived with disability (YLDs), and the disability-adjusted life years (DALYs) were calculated according to the new methodology designed for that purpose. RESULTS: The loss of years of healthy life due to road incidents of motorcyclists in the four-year period was 80,046 DALYs (823.8 per 100,000 inhabitants), with a higher proportion in men (81.3% and a ratio of 5 to 1 compared to women); the YLDs was 66.6% with marked differences in favor of men. There was nearly a 38% difference in the ages of 15 to 19 as well as a 19% difference from 30 to 49, compared to women. Premature death (YLLs) contributed to 33.4% of DALYs, with significant presentation in the above-mentioned age groups. CONCLUSIONS: The greatest loss of years of healthy life due to road incidents of motorcyclists in Medellin was due to non-fatal injuries and was concentrated in young men. If the trend of motorcycle road incidents continues, both local and national road safety plans will fail to accomplish the expected results, especially among motorcycle users.

Simultaneous quantification of Cd(II) and Pb(II) in surface marine sediments using Ag-Hg and Ag-Bi nanoalloys glassy carbon modified electrodes.

The evaluation of glassy carbon (GC) electrodes modified with a Nafion (Nf) film and doped with nanoalloys (Nys) deposits of Ag-Hg and Ag-Bi and their application to determination of Cd (II) and Pb(II) in marine sediments, is described. Deposited Ag-Hg and AgBi Nys have a size of approximately ~80 nm dispersed and embedded inside the booths of the Nf net, while other of them remained on Nf net surface. For the AgBiNysNf-GC electrode, a detection limit (DL), 3 s criterion, slightly higher than for the AgHgNysNf-GC modified electrode was obtained. Accuracy of measurements was asserted by comparison with quantification of Cd and Pb in three sets of marine sediments samples previously analyzed by inductively coupled plasma optical emission spectroscopy (ICP-OES). The values of the standard deviation and the coefficients of variation are very low, and also comparable between the different determinations.

Impact of Erythropoietin Production by Erythroblastic Island Macrophages on Homeostatic Murine Erythropoiesis.

Erythropoietin (EPO) is an essential hormone for erythropoiesis, protecting differentiating erythroblasts against apoptosis. EPO has been largely studied in stress or pathological conditions but its regulatory role in steady state erythropoiesis has been less documented. Herein, we report production of EPO by bone marrow-derived macrophages (BMDM) in vitro, and its further enhancement in BMDM conditioned with media from apoptotic cells. Confocal microscopy confirmed EPO production in erythroblastic island (EBI)-associated macrophages, and analysis of mice depleted of EBI macrophages by clodronate liposomes revealed drops in EPO levels in bone marrow (BM) cell lysates, and decreased percentages of EPO-responsive erythroblasts in the BM. We hypothesize that EBI macrophages are an in-situ source of EPO and sustain basal erythropoiesis in part through its secretion. To study this hypothesis, mice were injected with clodronate liposomes and were supplied with exogenous EPO (1-10 IU/mouse) to evaluate potential rescue of the deficiency in erythroid cells. Our results show that at doses of 5 and 10 IU, EPO significantly rescues BM steady state erythropoiesis in mice deficient of macrophages. We propose existence of a mechanism by which EBI macrophages secrete EPO in response to apoptotic erythroblasts, which is in turn controlled by the numbers of erythroid precursors generated.