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Excessive physical exercise affects more than just the muscles; it can also alter brain chemistry. A new study published in the journal Neuroscience revealed that exhaustive training without adequate rest alters the regulation of dopamine in the hippocampus, a brain region closely linked to memory and the regulation of emotions. When observing mice subjected to an intense exercise routine, Brazilian researchers noted that dopamine, a neurotransmitter essential for alertness and motivation, [...]

Una investigación que sin duda generará un acalorado debate aporta evidencias experimentales de que la exposición a uno de los principales componentes de la contaminación atmosférica urbana (la materia particulada de tipo PM2,5) aumenta el estrés oxidativo y agrava la destrucción de los tejidos periodontales. Con este estudio queda bien claro que la contaminación del aire puede perjudicar a la salud bucal. El estudio lo han realizado en Brasil unos investigadores de la Universidad [...]

Scientists at the Brazilian Center for Research in Energy and Materials (CNPEM) in Campinas, São Paulo state, developed an instrument for the Sirius particle accelerator that can observe the interior of solar cells on a nanoscale while they are operating. Rather than analyzing isolated components in a laboratory setting, this new platform enables the evaluation of complete devices generating electricity under real operating conditions. It simulates daily exposure to light, heat and [...]

HOUSTON – (Nov. 13, 2019) – A lightweight material full of holes is nearly as hard as diamond. The mere dents left by speeding bullets prove it. Researchers at Rice University’s Brown School of Engineering and their colleagues are testing polymers based on tubulanes, theoretical structures of crosslinked carbon nanotubes predicted to have extraordinary strength. The Rice lab of materials scientist Pulickel Ajayan found tubulanes can be mimicked as scaled-up, 3D-printed [...]

Un estudio confirma que la simbiosis entre hongo y alga, capaz de disolver rocas y ampliamente distribuida por la Tierra hace 410 millones de años, contribuyó a la formación de los primeros suelos. Un grupo de investigadores apoyado por la FAPESP confirmó, por primera vez con un alto grado de detalle, la identidad de los primeros líquenes que habitaron la Tierra, Spongiophyton, hace alrededor de 410 millones de años. Simbiosis entre hongo y alga, hoy bastante comunes en troncos de [...]

Every year, scientists around the globe share exciting discoveries of new species, but, sadly, many others vanish without a trace. Amphibians, in particular, are in serious trouble worldwide. Researchers often think they’ve found a new species, only to later realize it has already become extinct. Back in 1963, a couple of researchers stumbled upon a tiny frog about 340 miles south of its expected range in Brazil. This intriguing find was documented in a study published on September 19 [...]