sexta-feira, 27 de abril de 2018

676 caveiras na Cidade do México...

.... And counting:
http://www.bbc.com/news/world-latin-america-40473547

Citando:
"

Its base has yet to be uncovered, and it is thought many more skulls will be found.


They are believed to form part of the Huey Tzompantli, a skull rack some 60 metres (200ft) in diameter which stood on the corner of the chapel of Huitzilopochtli, the Aztec god of the sun, war and human sacrifice.


Archaeologists have no doubt it is one of the racks, or tzompantli, described by soldier Andres de Tapia, who accompanied Hernan Cortes in the 1521 conquest of Mexico.


Cortes landed at Veracruz, on Mexico's east coast, in 1519. Two years later, allied with other native forces, Cortes' men captured the Aztec capital."

Maior sacrifício humano (crianças) descoberto

http://www.bbc.com/news/world-latin-america-43928277

Citando:
"The final tally announced this week of 140 children show that the victims were aged between five and 14 - though most were between eight and 12 years old, National Geographic reports.

The children are known to be victims of human sacrifice because of cut marks to the bones, including the sternum, the bone in the centre of the chest. Many ribs were also damaged - which may indicate the heart was removed."
(...)
"Carbon dating of textiles discovered at the site suggest the incident happened around 1400-1450 AD.

The Chimú, who worshipped a moon deity, were conquered by the Inca civilisation just a few decades later. About 50 years after that, the Spanish arrived in South America and conquered the Inca empire in turn."

segunda-feira, 23 de abril de 2018

Salamandra e a recuperação dos tecidos

http://www.dnoticias.pt/mundo/especie-de-salamandra-ameacada-perspectiva-tratamentos-para-lesoes-na-medula-espinal-XY3054077#

Citando:
"A mesma proteína, que afeta a expressão génica (processo pelo qual a informação hereditária contida num gene, como a sequência de ADN, é processada), existe nos humanos e funciona neles em conjunto com outras proteínas.

Quando uma salamandra mexicana sofre uma lesão na medula espinal, as células da glia (células auxiliares do sistema nervoso central que ‘alimentam’ as células principais, os neurónios) reposicionam-se para reconstruir as conexões entre as terminações nervosas e reparar a medula espinal."

quarta-feira, 4 de abril de 2018

Flashes (transients)?

https://www.geek.com/science/72-flashes-a-ah-astronomers-cant-place-mysterious-explosions-1735961/

Citando:
"A team of astronomers are struggling to explain the origin of 72 gone-in-a-flash cosmic events.

Six dozen transients spotted in data from the Dark Energy Survey Supernova Program (DES-SN) remain a mystery, according to findings presented at the European Week of Astronomy and Space Science.


Part of a global effort to understand dark energy, DES-SN uses the Cerro Tololo Inter-American Observatory in the Chilean Andes to search for supernovas—titanic explosions that mark the end of a massive star’s life."

Anti-matéria medida

https://www.livescience.com/62216-most-precise-antimatter-measurement.html

Citando:
"So what does the most precise measurement of antimatter even tell us? Well, unfortunately, not much more than we already knew. As expected, hydrogen and antihydrogen — matter and antimatter — behave identically. Now, we just know that they're identical at a measurement of parts per trillion. However, Ulmer said the 2-parts-per-trillion measurement does not rule out the possibility that something is deviating between the two types of matter at an even greater level of precision that has thus far defied measurement.

As for Hangst, he's less concerned with answering the question of why our universe of matter exists as it does without antimatter — what he calls "the elephant in the room." Instead, he and his group want to focus on making even more precise measurements, and exploring how antimatter reacts with gravity — does it fall down like normal matter, or could it fall up?"

terça-feira, 3 de abril de 2018