Core-shell Co/CoO integrated on 3D nitrogen doped reduced graphene oxide aerogel as an enhanced electrocatalyst for the oxygen reduction reaction

Here, we demonstrate that Cobalt/cobalt oxide core-shell nanoparticles integrated on nitrogen-doped (N-doped) three-dimensional reduced graphene oxide aerogel-based architecture (Co/CoO-NGA) were synthesized through a facile hydrothermal method followed by annealing treatment. The unique endurable porous structure could provide sufficient mass transfer channels and ample active sites on Co/CoO-NGA to facilitate the catalytic reaction. The synthesized Co/CoO-NGA was explored as an electrocatalyst for the oxygen reduction reaction, showing comparable oxygen reduction performance with excellent methanol resistance and better durability compared with Pt/C

Core-shell Co/CoO integrated on 3D nitrogen doped reduced graphene oxide aerogel as an enhanced electrocatalyst for the oxygen reduction reaction

Here, we demonstrate that Cobalt/cobalt oxide core-shell nanoparticles integrated on nitrogen-doped (N-doped) three-dimensional reduced graphene oxide aerogel-based architecture (Co/CoO-NGA) were synthesized through a facile hydrothermal method followed by annealing treatment. The unique endurable porous structure could provide sufficient mass transfer channels and ample active sites on Co/CoO-NGA to facilitate the catalytic reaction. The synthesized Co/CoO-NGA was explored as an electrocatalyst for the oxygen reduction reaction, showing comparable oxygen reduction performance with excellent methanol resistance and better durability compared with Pt/C

Informe final del programa Ejercicio Profesional Supervisado realizado en la clínica dental del Centro de Atención Permanente Dionisio Gutiérrez, en San Cristobal, Totonicapán, Guatemala, período junio a octubre 2016-febrero a mayo 2017.

Programa de Actividades Comunitarias: consistieron en el entechado del escenario de la Escuela Oficial Rural Mixta, La Ciénaga, así como la remodelación de la Clínica Dental del Centro de Atención Permanente Dionisio Gutiérrez, ambos del municipio de San Cristóbal, Totonicapán, considerando este último, la pintura de paredes internas y externas, cambio de sillón y succión, así como la reparación del lavamanos. Programa de Prevención: El programa de Enjuagatorios de Fluoruro de Sodio abarcó la población escolar urbana y rural de San Cristóbal, Totonicapán donde se desarrolló el Programa EPS, se cubrió a la población de las siguientes 3 escuelas del municipio: Escuela Oficial Urbana Mixta Juan Bautista Gutiérrez, Escuela Oficial Rural Mixta J.M. La Ciénaga y Escuela Oficial Urbana Mixta La Independencia, con una atención promedio de 1,117 escolares al mes. Se realizaron 65 actividades en salud bucal beneficiando a 6,310 niños y niñas. En el subprograma de prevención se atendió a un total de 160 niños con Sellantes de Fosas y Fisuras (SFF) y se colocaron un total de 1,028 SFF. Programa de Atención Integral a Escolares: Se atendió un total de 57 escolares, a quienes se les realizaron un total de 60 profilaxis y aplicaciones tópicas de flúor, 453 sellantes de fosas y fisuras, 8 ionómeros de vidrio, 24 tratamientos periodontales, 105 amalgamas, 279 resinas, 6 pulpotomías, 4 tratamientos de conductos radiculares, 6 coronas de acero y 39 extracciones dentales. A los pacientes de población general se les realizaron 30 exámenes dentales. Investigación Única: Se realizó un estudio en una muestra de 20 estudiantes de las escuelas anteriormente mencionadas. Administración del Consultorio: Abarca capacitación del personal auxiliar. Durante los 8 meses se desarrollaron las capacitaciones semanales

Dynamic mechanical thermal analysis of aqueous sugar solutions containing fructose, glucose, sucrose, maltose and lactose

The glass transition of glucose, fructose, lactose, maltose and sucrose solutions at maximum cryo-concentration was studied by Dynamic Mechanical Thermal Analysis (DMTA), using the disc bending technique. The glass transition temperatures were determined from the peaks in the loss modulus E′′, which corresponds theoretically to the resonance point (Maxwell model) for several input frequencies. The frequency dependence was well described by both an Arrhenius-type model and by the WLF (Williams, Landel and Ferry) equation, yielding glass transition temperatures for an average molecular vibration time of 100 s, which were similar to published midpoint temperatures determined by DSC scans. Some sugar mixtures were studied, yielding results that were well described by the Gordon–Taylor equation, using literature data. The frequency dependence of the viscoelastic ratio was also well approximated by an Arrhenius-type equation, with activation energies similar to those of the glass transition temperature and corresponded well to published values of the endset of glass transition

Distribution of Major Health Risks: Findings from the Global Burden of Disease Study

BACKGROUND: Most analyses of risks to health focus on the total burden of their aggregate effects. The distribution of risk-factor-attributable disease burden, for example by age or exposure level, can inform the selection and targeting of specific interventions and programs, and increase cost-effectiveness. METHODS AND FINDINGS: For 26 selected risk factors, expert working groups conducted comprehensive reviews of data on risk-factor exposure and hazard for 14 epidemiological subregions of the world, by age and sex. Age-sex-subregion-population attributable fractions were estimated and applied to the mortality and burden of disease estimates from the World Health Organization Global Burden of Disease database. Where possible, exposure levels were assessed as continuous measures, or as multiple categories. The proportion of risk-factor-attributable burden in different population subgroups, defined by age, sex, and exposure level, was estimated. For major cardiovascular risk factors (blood pressure, cholesterol, tobacco use, fruit and vegetable intake, body mass index, and physical inactivity) 43%–61% of attributable disease burden occurred between the ages of 15 and 59 y, and 87% of alcohol-attributable burden occurred in this age group. Most of the disease burden for continuous risks occurred in those with only moderately raised levels, not among those with levels above commonly used cut-points, such as those with hypertension or obesity. Of all disease burden attributable to being underweight during childhood, 55% occurred among children 1–3 standard deviations below the reference population median, and the remainder occurred among severely malnourished children, who were three or more standard deviations below median. CONCLUSIONS: Many major global risks are widely spread in a population, rather than restricted to a minority. Population-based strategies that seek to shift the whole distribution of risk factors often have the potential to produce substantial reductions in disease burden