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# Trace Elements in Human Cerebral Organoids

The study of the embryonic development of the human brain and the distribution of nutrients during this phase was for a long time limited to animal models and dead human tissues. Much has changed with the so-called organoids: mini-organs created in vitro in the laboratory, from a few cells of the organ themselves, from embryonic stem cells or from pluripotent cells. These organoids present a three-dimensional micro-anatomy similar to the real organ but more simplified.

# Complex Interplay of Properties of Catalyst for H2 Production

In the water gas shift (WGS) reaction, CO reacts with steam producing $\rm CO_2$ and $\rm H_2$. It is an important reaction to decrease the CO level in the syngas, deriving from the process of steam reforming of natural gas or other sources. In addition, WGS is one of the main reactions to produce $\mathbf{H_2}$ at industrial scale. In that case, it is performed in two steps: the first one at high temperature, with iron-based catalysts, and the second one at low temperature, with copper-based catalysts.

# Catalytically Active Membrane-like Devices

It is well known that for many metal-catalyzed reactions the support influences the catalytic properties of the metal particles. The strong metal−support interaction (SMSI) effect may be due to:

• geometrical effects: for example, the metallic nanoparticles (MNPs) are capped by functional groups from the support that migrate to the surface of the nanoparticles during the reaction;
• electronic effects: charge transfer between support and nanoparticle.

Indeed, the capping layer can create new catalytically active sites or also block access to them, the latter being detrimental for the catalytic properties of the nanoparticles.

# Call for Proposals for the LNLS beamlines

Call for Proposals is open for the LNLS beamlines (see list below).

Submission period: March 01st to 31st, 2017. BeamtimeSecond Semester 2017.

# Recycling of Wastes from The Tanning Industry

Growth in the use of high quality colored ceramics has stimulated research into the development of new classes of pigments with superior durability and color reproducibility, which can be produced using inexpensive, straightforward, and eco-friendly synthesis procedures.

At the same time, increasing efforts are aimed at solving the environmental problems related to the generation of waste by many industrial activities. Sustainable development needs to provide substantial reductions in waste generation, using strategies of prevention, reduction, recycling, and reuse. This has led to the concept of green manufacturing, also known as industrial symbiosis.

# Open registrations to the first “Brazilian School Of Synchrotron – EBS”

The registrations to the “Brazilian Synchrotron School: Fundamentals and Applications” are now open. The event will be held from July 10 to 21st 2017, at the Brazilian Center for Research in Energy and Materials (CNPEM), in Campinas.

Promoted by the Brazilian Synchrotron Light Laboratory (LNLS), the School will comprehend basic concepts of synchrotron light production and properties, specific techniques based on synchrotron light and future technologies to be incorporated in the light sources field.

The two-week event will be composed by theoretical and practical classes, provided by LNLS researchers. Check out the schedule.

Who can participate: Undergraduate, Masters and Doctorates students during course, researchers, teachers and professionals of any area.

Registrations open until April 3rd.

# Electronic Structure of Magnetic $\rm Fe_3 Ga_4$ Nanowires

Nanowires belong to a new class of quasi-unidimensional materials that have been attracting great interest due to their numerous potential applications, such as functional materials in biomedical sciences, electronics, optics, magnetic devices and energy storage. Among the several ways to produce nanowires, one can mention template-assisted fabrication, vapor-liquid-solid mechanism, molecular beam epitaxy and electrochemical nanolithography. In particular, nanoporous alumina membranes have been widely used as templates for magnetic nanowire arrays produced by electrochemical deposition due the simplicity, versatility, efficiency and low cost implementation of this technique. However, the nanowires obtained by this way generally present poor crystallinity and are restricted to metallic alloys.

# Neutron and Synchrotron Diffraction Studies of BCZY27 Proton Conductor

High-temperature electrochemical devices exhibiting the preferential transfer of protons have the potential to produce a shift to a sustainable energy economy in which hydrogen replaces hydrocarbon sources as the principal fuel for stationary power and transportation. Protonic ceramic fuel cells (PCFCs), with a proton-conducting ceramic electrolyte membrane, cleanly convert the chemical energy of hydrogen to electrical energy in an intermediate temperature range (773−1023 K). This interval neatly alleviates the technological problems and costs associated with the higher operating temperatures of contemporary solid oxide fuel cells based on an oxide-ion conducting electrolyte and those of the polymeric devices which require expensive electrocatalysts due to the low operation temperature, below 373 K.