Once: Mujeres, migración, informalidad y cocina

78 páginasEste libro recoge las vivencias que compartimos con las mujeres de la comuna 11 de Cali, las cuales trabajan como cocineras en los espacios públicos de la ciudad, bajo la ejecución del proyecto “Mujeres, migración, informalidad y cocina: comprensión de condiciones laborales en la comuna 11 de Santiago de Cali”. El proyecto fue posible gracias a los recursos que la Fundación WWB Colombia puso a disposición, atendiendo a su propósito de mejorar las condiciones laborales de las mujeres, siempre creyendo en su poder para transformar la realidad

Interactions of Gold Nanoparticles with the Interior of Hollow Graphitized Carbon Nanofibers

Interactions of free-standing gold nanoparticles and hollow graphitized nanofibers in colloidal suspension are investigated, revealing the first example of the controlled arrangement of nanoparticles inside nano-containers, as directed by their internal structure. The ordering is highly effective for small gold nanoparticles whose sizes are commensurate with the height of graphitic step-edges in the graphitized carbon nanofibers and is less effective for larger gold nanoparticles. Studies aimed at understanding the role of the organic-solvent surface tension, employed for the filling experiments, demonstrate that gold nanoparticles become preferentially anchored into the hollow graphitized carbon nanofibers under a mixture of pentane/CO 2 in supercritical conditions. It is shown that a three-step cleaning procedure enables effective removal of gold nanoparticles adsorbed on the exterior surface of graphitized carbon nanofibers, while ordered arrays of encapsulated nanoparticles are retained. Interactions of gold nanoparticles and hollow graphitized nanofibers reveal the first example of the controlled arrangement of nanoparticles inside carbon nano-containers. The ordering is directed by the graphitic step-edges in the nanofibers. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

A high-rate aqueous symmetric pseudocapacitor based on highly graphitized onion-like carbon/birnessite-type manganese oxide nanohybrids

We present a study on the pseudocapacitive properties of birnessite-type MnO2 grafted on highly graphitized onion-like carbon (OLC/MnO2). In a three-electrode setup, we evaluated two different substrates, namely a platinum disc and nickel foam. The OLC/MnO2 nanohybrid exhibited a large specific capacitance (Csp) of 295 and 323 F g 1 (at 1 A g 1) for the Pt disc and Ni foam, respectively. In addition, the Ni foam substrate exhibited much higher rate capability (power density) than the Pt disc. A symmetrical two-electrode device, fabricated with the Ni foam, showed a large Csp of 254 F g 1, a specific energy density of 5.6 W h kg 1, and a high power density of 74.8 kW kg 1. These values have been the highest for onion-based electrodes so far. The device showed excellent capacity retention when subjected to voltage-holding (floating) experiments for 50 h. In addition, the device showed a very short time constant (s ¼ 40 ms). This high rate handling ability of the OLC/MnO2 nanohybrid, compared to literature reports, promises new opportunities for the development of aqueous-based pseudocapacitors.CSIR. South Africa's Department of Science and Technology (DST) and National Research Foundation (NRF) under the “Nanotechnology Flagship Programme” (supercapacitors and fuel cell project, Grant no: 69849).http://www.rsc.org/MaterialsAhb201

Increase in insulin sensitivity by the association of chicoric acid and chlorogenic acid contained in a natural chicoric acid extract (NCRAE) of chicory ( Cichorium intybus L.) for an antidiabetic effect

UMR AGAP équipe DAAVInternational audienceChicory (Cichorium intybus L.) is an indigenous vegetable widely cultivated in Europe, America and Asia. In ancient times, the leaves, flowers, seeds, and roots have been used as a wealth of health benefits including its tonic effects, the ability to ease digestive problems and to detoxify liver. In Indian traditional therapy, chicory was known to possess antidiabetic effect. In the traditional medicine of Bulgaria and Italy, chicory was used as hypoglycemic decoctions